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| 1 | Antisense MMP-9 RNA inhibits malignant glioma cell growth in vitro and in vivo显示文摘The matrix-degrading metalloproteinases (MMPs), particularly MMP-9, play important roles in the pathogenesis and development of malignant gliomas. In the present study, the oncogenic role of MMP-9 in malignant glioma cells was investigated via antisense RNA blockade in vitro and in vivo. TJ905 malignant glioma cells were transfected with pcDNA3.0 vector expressing antisense MMP-9 RNA (pcDNA-AS-MMP9), which significantly decreased MMP-9 expression, and cell proliferation was assessed. For in vivo studies, U251 cells, a human malignant glioma cell line, were implanted subcutaneously into 4-to 6-week-old BALB/c nude mice. The mice bearing well-established U251 gliomas were treated with intratumoral pcDNA-AS-MMP9-Lipofectamine complex (AS-MMP-9-treated group), subcutaneous injection of endostatin (endostatin-treated group), or both (combined therapy group). Mice treated with pcDNA (empty vector)-Lipofectamine served as the control group. Four or eight weeks later, the volume and weight of tumor, MMP-9 expression, microvessel density and proliferative activity were assayed. We demonstrate that pcDNA-AS-MMP9 significantly decreased MMP-9 expression and inhibited glioma cell proliferation. Volume and weight of tumor, MMP-9 expression, microvessel density and proliferative activity in the antisense-MMP-9-treated and therapeutic alliance groups were significantly lower than those in the control group. The results suggest that MMP-9 not only promotes malignant glioma cell invasiveness, but also affects tumor cell proliferation. Blocking the expression of MMP-9 with antisense RNA substantially suppresses the malignant phenotype of glioma cells, and thus can be used as an effective therapeutic strategy for malignant gliomas. | Cuiyun Sun Qian Wang Hongxu Zhou Shizhu Yu Alain R. Simard Chunsheng Kang Yanyan Li Yanling Kong Tongling An Yanjun Wen Fudong Shi Junwei Hao | 2013 | Neuroscience Bulletin2013，29，1： | 14 |
| 2 | Onco-miR-24 regulates cell growth and apoptosis by targeting BCL2L11 in gastric cancer显示文摘胃的癌症是世界范围的最普通的恶意之一;然而,在 tumorigenesis 的分子的机制仍然需要探索。BCL2L11 属于 BCL-2 家庭,并且充当内在的 apoptotic 串联的一个中央管理者并且调停房间 apoptosis。尽管 miRNAs 被报导了涉及癌症开发的每个阶段,在 GC 的 miR-24 的角色还没被报导。在现在的学习,当 BCL2L11 的表示在 GC 的肿瘤纸巾被禁止时, miR-24 被发现起来调整。研究从在 vitro 并且在显示出的 vivo,那 miR-24 调整 BCL2L11 表示由与 mRNA 的 3UTR 直接有约束力,因此支持房间生长,移植当禁止房间 apoptosis 时。因此, miR-24 是能是为未来的潜在的药目标的新奇 onco-miRNA 临床的使用。 | Haiyang Zhang Jingjing Duan Yanjun Qu Ting Deng Rui Liu Le Zhang Ming Bai Jialu Li Tao Ning Shaohua Ge Xia Wang ZhenzhenWang~ Qian Fan Hongli Li Guoguang Ying Dingzhi Huang Yi Ba | 2016 | Protein & Cell2016，7，2： | 11 |
| 3 | Systems metabolic engineering strategies for the production of amino acids显示文摘Systems metabolic engineering is a multidisciplinary area that integrates systems biology,synthetic biology and evolutionary engineering.It is an efficient approach for strain improvement and process optimization,and has been successfully applied in the microbial production of various chemicals including amino acids.In this review,systems metabolic engineering strategies including pathwayfocused approaches,systems biology-based approaches,evolutionary approaches and their applications in two major amino acid producing microorganisms:Corynebacterium glutamicum and Escherichia coli,are summarized. | Qian Ma Quanwei Zhang Qingyang Xu Chenglin Zhang Yanjun Li Xiaoguang Fan Xixian Xie Ning Chen | 2017 | Synthetic and Systems Biotechnology2017，2，2： | 10 |
| 4 | Warm temperature compromises JA-regulated basal resistance to enhance Magnaporthe oryzae infection in rice显示文摘Changes in global temperatures profoundly affect the occurrence of plant diseases.It is well known that rice blast can easily become epidemic in relatively warm weather.However,the molecular mechanism remains unclear.In this study,we show that enhanced blast development at a warm temperature(22C)compared with the normal growth temperature(28C)is rice plant-determined.Comparative transcriptome analysis revealed that jasmonic acid(JA)biosynthesis and signaling genes in rice could be effectively induced by Magnaporthe oryzae at 28C but not at 22C.Phenotypic analyses of the osaoc1 and osmyc2 mutants,OsCOI1 RNAi lines,and OsMYC2-OE plants further demonstrated that compromised M.oryzaeinduced JA biosynthesis and signaling lead to enhanced blast susceptibility at the warm temperature.Consistent with these results,we found that exogenous application of methyl jasmonate served as an effective strategy for improving blast resistance under the warm environmental conditions.Furthermore,decreased activation of JA signaling resulted in the downregulated expression of some key basal resistance genes at 22C when compared with 28C.Among these affected genes,OsCEBiP(chitin elicitorbinding protein precursor)was found to be directly regulated by OsMYB22 and its interacting protein OsMYC2,a key component of JA signaling,and this contributed to temperature-modulated blast resistance.Taken together,these results suggest that warm temperature compromises basal resistance in rice and enhances M.oryzae infection by reducing JA biosynthesis and signaling,providing potential new strategies for managing rice blast disease under warm climate conditions. | Jiehua Qiu Junhui Xie Ya Chen Zhenan Shen Huanbin Shi Naweed I.Naqvi Qian Qian Yan Liang Yanjun Kou | 2022 | Molecular Plant2022，15，4： | 5 |
| 5 | A mechanically tuned Kerr comb in a dispersion-engineered silica microbubble resonator显示文摘This paper discusses the developement and investigation of a silica microbubble resonator(MBR) that is optimized to cancel mode dispersion with material dispersion, at a wavelength of approximately 1550 nm and maintain a quality factor of an optical mode as large as 5.4 × 10~7. Benefitting from the near-zero dispersion and high quality factor, a primary optical comb is generated in the MBR using cascaded four-wave mixing processes, which span over 300 nm with several tens of teeth. Furthermore, the frequency comb could be gradually tuned by mechanically stretching the MBR. This tunable Kerr comb has multiple potential applications in precision measurements and sensing applications, such as molecular spectroscopy and ranging. | FangJie Shu PeiJi Zhang YanJun Qian ZhengYu Wang Shuai Wan Chang Ling Zou GuangCan Guo ChunHua Dong | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，5： | 5 |
| 6 | Single-Step Organization of Plasmonic Gold Metamaterials with Self-Assembled DNA Nanostructures显示文摘Self-assembled DNA nanostructures hold great promise as nanoscale templates for organizing nanoparticles(NPs)with nearatomistic resolution.However,large-scale organization of NPs with high yield is highly desirable for nanoelectronics and nanophotonic applications.Here,we design fve-strand DNA tiles that can readily self-assemble into well-organized micrometerscale DNA nanostructures.By organizing gold nanoparticles(AuNPs)on these self-assembled DNA nanostructures,we realize the fabrication of one-and two-dimensional Au nanostructures in single steps.We further demonstrate the one-pot synthesis of Au metamaterials for highly amplifed surface-enhanced Raman Scattering(SERS).Tis single-step and high-yield strategy thus holds great potential for fabricating plasmonic metamaterials. | Shaokang Ren Jun Wang Chunyuan Song Qian Li Yanjun Yang Nan Teng Shao Su Dan Zhu Wei Huang Jie Chao Lianhui Wang Chunhai Fan | 2019 | Research2019，，1： | 4 |
| 7 | Searching for the Nano-Hertz Stochastic Gravitational Wave Background with the Chinese Pulsar Timing Array Data ReleaseⅠ显示文摘Observing and timing a group of millisecond pulsars with high rotational stability enables the direct detection of gravitational waves(GWs).The GW signals can be identified from the spatial correlations encoded in the times-of-arrival of widely spaced pulsar-pairs.The Chinese Pulsar Timing Array(CPTA)is a collaboration aiming at the direct GW detection with observations carried out using Chinese radio telescopes.This short article serves as a“table of contents”for a forthcoming series of papers related to the CPTA Data Release 1(CPTA DR1)which uses observations from the Five-hundred-meter Aperture Spherical radio Telescope.Here,after summarizing the time span and accuracy of CPTA DR1,we report the key results of our statistical inference finding a correlated signal with amplitude logA_(c)=-14.4_(-2.8)^(+1.0)for spectral index in the range ofα∈[-1.8,1.5]assuming a GW background(GWB)induced quadrupolar correlation.The search for the Hellings–Downs(HD)correlation curve is also presented,where some evidence for the HD correlation has been found that a 4.6σstatistical significance is achieved using the discrete frequency method around the frequency of 14 n Hz.We expect that the future International Pulsar Timing Array data analysis and the next CPTA data release will be more sensitive to the n Hz GWB,which could verify the current results. | Heng Xu Siyuan Chen Yanjun Guo Jinchen Jiang Bojun Wang Jiangwei Xu Zihan Xue RNicolas Caballero Jianping Yuan Yonghua Xu Jingbo Wang Longfei Hao Jingtao Luo Kejia Lee Jinlin Han Peng Jiang Zhiqiang Shen Min Wang Na Wang Renxin Xu Xiangping Wu Richard Manchester Lei Qian Xin Guan Menglin Huang Chun Sun Yan Zhu | 2023 | Research in Astronomy and Astrophysics2023，23，7： | 3 |
| 8 | Prediction of major adverse cardiac events is the first critical task in the management of immune checkpoint inhibitor-associated myocarditis显示文摘Dear Editor,The application of immune checkpoint inhibitors(ICIs),anti-tumor immunotherapy unleashing the host immune system to eradicate tumor cells,has revolutionized the treatment of various advanced cancers and showed remarkable anti-tumor effects[1].However,emphasis must be placed on fatal immune-related adverse events(irAEs),especially some fulminant irAEs like ICI-related cardiovascular AEs[2,3].However,due to the low rate of cardiovascular AEs,little is known about the effective methods for evaluating the risk of catastrophic cardiac events in ICI-associated myocarditis and its management[4,5]. | Yan Xu Yanjun Song Xiaoyan Liu Yuequan Shi Yingxian Liu Hao Qian Xiaoxing Gao Minjiang Chen Ruili Pan Jing Zhao Wei Zhong Wei Wu Mengzhao Wang | 2022 | Cancer Communications2022，42，9： | 3 |
| 9 | Construction and electrochemical mechanism investigation of hierarchical core-shell like composite as high performance anode for potassium ion batteries显示文摘Potassium-ion batteries(PIBs)are promising candidates for next-generation energy storage devices due to the earth abundance of potassium,low cost,and stable redox potentials.However,the lack of promising high-performance electrode materials for the intercalation/deintercalation of large potassium ions is a major challenge up to date.Herein,we report a novel uniform nickel selenide nanoparticles encapsulated in nitrogen-doped carbon(defined as“NiSe@NC”)as an anode for PIBs,which exhibits superior rate performance and cyclic stability.Benefiting from the unique hierarchical core-shell like nanostructure,the intrinsic properties of metal-selenium bonds,synergetic effect of different components,and a remarkable pseudocapacitance effect,the anode exhibits a very high reversible capacity of 438 mA·h·g^(-1)at 50 mA·g^(-1),an excellent rate capability,and remarkable cycling performance over 2,000 cycles.The electrochemical mechanism were investigated by the in-situ X-ray diffraction,ex-situ high-resolution transmission electron microscopy,selected area electron diffraction,and first principle calculations.In addition,NiSe@NC anode also shows high reversible capacity of 512 mA·h·g^(-1)at 100 mA·g^(-1)with 84%initial Coulombic efficiency,remarkable rate performance,and excellent cycling life for sodium ion batteries.We believe the proposed simple approach will pave a new way to synthesize suitable anode materials for secondary ion batteries. | Nadeem Hussain Suyuan Zeng Zhenyu Feng Yanjun Zhai Chunsheng Wang Mingwen Zhao Yitai Qian Liqiang Xu | 2021 | Nano Research2021，14，10： | 1 |
| 10 | Overlapping and communication policies in product development 显示文摘 | Lin Jun Qian Yanjun Cui Wentian | 2010 | European Journal of Operational Research2010，201，3： | 1 |
| 11 | Petroleum coke derived porous carbon/NiCoP with efficient reviving catalytic and adsorptive activity as sulfur host for high performance lithium-sulfur batteries显示文摘Sulfur-host material with abundant pore structure and high catalysis plays an important role in development of high-energy-density lithium-sulfur(Li-S)batteries.Herein,we implanted NiCoP nanoparticles into the N,S co-doped porous carbon derived from petroleum coke(PCPC)to fabricate the sulfur-host of PCPC/NiCoP composites.The high specific surface area of PCPC provides abundant adsorption sites for capturing LiPSs and the NiCoP nanoparticles to improve the polarity and boost the LiPSs conversion kinetics of PCPC.The Li-S cells fabricated with PCPC/NiCoP as sulfur-host deliver high discharge capacity of 1,462.7 mAh·g^(-1)under the current density of 0.1 C and exhibit ultralong lifespan over 800 cycles under the current density of 1,2,and even 5 C.Additionally,the prepared composites cathodes deliver an outstanding discharge capacity of 932.5 and 826.4 mAh·g^(-1)at 0.5 and 1 C with a high sulfur loading of over 3.90 mg·cm^(-2),and remain stable about 60 cycles.Furthermore,the promoted adsorption-conversion process of polysulfides by introducing NiCoP nanoparticles into PCPC was investigated by experimental and theoretical calculation studies.This work offers a new light for tacking the obstacles of porous carbon-based sulfur-host and propelling the development of petroleum coke-based porous carbon for high performance Li-S batteries. | Bo Zhang Lu Wang Bin Wang Yanjun Zhai Shuyuan Zeng Meng Zhang Yitai Qian Liqiang Xu | 2022 | Nano Research2022，15，5： | 1 |
| 12 | Overlapping and communication policies in product development 显示文摘 | LIN Jun QIAN Yanjun CUI Wentian | 2010 | European Journal of Operational Research2010，201，3： | 1 |
| 13 | Effect of temperature control and high humidity on the preservation of JUFENG grapes 显示文摘 | Min Zhang Qian Tao Yanjun Huan | 2002 | Int Agro physics2002，16，： | 1 |
| 14 | Perovskite/GaAs-nanowire hybrid structure photodetectors with ultrafast multiband response enhancement by band engineering显示文摘We developed a hybrid structure photodetector combining one-dimensional(1D)inorganic GaAs nanowires and two-dimensional(2D)organic perovskite materials,which can achieve various performance enhancements using a relatively simple structure.Via the optical absorption enhancement of perovskite and the type-II energy band structure formed by the heterostructure,the responsivity and detectivity of the photodetector from ultraviolet(UV)to visible(Vis)wavelengths are significantly enhanced,reaching 75 A/W and 1.49×10^(11)Jones,respectively.The response time of the photodetector was significantly decreased by 3 orders,from 785 ms to 0.5 ms,and the dark current was further reduced to 237 fA.A photodetector was prepared with enhanced responsivity and ultrafast response time in the multiband region from the UV to Vis wavelength.To the best of our knowledge,this is the first time to combine inorganicⅢ-ⅤGaAs nanomaterials with organic perovskite materials,which verifies the effective combination of inorganic and organic materials in a mixed dimension.The excellent photoelectric performance of the perovskite/GaAs-nanowire hybrid structure photodetector makes it a potential candidate material for a wide range of photoelectric applications such as multiband photodetection. | XIAOBING HOU XITONG HONG FENGYUAN LIN JINZHI CUI QIAN DAI QIANLEI TIAN BINGHENG MENG YANJUN LIU JILONG TANG KEXUE LI LEI LIAO ZHIPENG WEI | 2023 | Photonics Research2023，11，4： | 0 |
| 15 | Cloning, expression profiling and promoter functional analysis of bone morphogenetic protein 2 in the tongue sole(Cynoglossus semilaevis)显示文摘BMP2 plays crucial roles in vertebrate developmental process and acts as a bone inducer during osteogenesis. We present here the molecular cloning of bmp2 cDNA from the marine flatfish Cynoglossus semilaevis, and the analysis of bmp2 expression profiling and promoter function. The full length of bmp2 cDNA sequence is 2 048 bp,which encodes a protein of 422 amino acids. Tissue expression distribution of bmp2 was examined in 14 tissues of mature individuals by quantitative real time PCR(qRT-PCR). The results revealed that bmp2 was expressed ubiquitously, and the highest expression level was detected in the spinal cord. Moreover, bmp2 expression levels were detected at 15 sampling time points of early developmental stages(egg, larva, juvenile and fingerling stages).The highest expression level of bmp2 was observed at the gastrula stage, which was about ten times higher than those at the other three embryo stages. Whole-mount in situ hybridization showed that the bmp2 signal was strongly detected at the location of the crown-like larval fin, heart and liver, and slightly expressed in the notochord at one day post hatch(dph); then the expression of bmp2 started to be concentrated in notochord at three dph. Subsequently, we characterized the 5′-flanking region of bmp2 by testing the promoter activity by Luciferase reporter assays. Positive regulatory region was detected at the location of –179 to +109. The predicted transcription factor binding sites(E-box binding factors, zinc finger transcription factor, etc.) in this region might participate in the transcriptional regulation of the bmp2 gene. | MA Qian FAN Yanjun ZHUANG Zhimeng LIU Shufang | 2018 | Acta Oceanologica Sinica2018，37，2： | 0 |
| 16 | Vacuolar Phosphate Transporter1 (VPT1) may transport sugar in response to soluble sugar status of grape fruits显示文摘Vacuolar Phosphate Transporter1(VPT1)-mediated phosphate uptake in the vacuoles is essential to plant development and fruit ripening.Interestingly,here we find that the VPT1 may transport sugar in response to soluble sugar status of fruits.The VvVPT1 protein isolated from grape(Vitis vinifera)berrieswas tonoplast-localized and contains SPX(Syg1/Pho81/XPR1)and MFS(major facilitator superfamily)domains.Its mRNA expression was significantly increased during fruit ripening and induced by sucrose.Functional analyses based on transient transgenic systems in grape berry showed that VvVPT1 positively regulated berry ripening and significantly affected hexose contents,fruit firmness,and ripening-related gene expression.The VPT1 proteins(Grape VvVPT1,strawberry FaVPT1,and Arabidopsis AtVPT1)all showed low affinity for phosphate verified in yeast system,while they appear different in sugar transport capacity,consistent with fruit sugar status.Thus,our findings reveal a role for VPT1 in fruit ripening,associated to its SPX and MFS domains in direct transport of soluble sugar available into the vacuole,and open potential avenues for genetic improvement in fleshy fruit. | Qian Bai Xuexue Chen Zhenzhen Zheng Jinjing Feng Yanjun Zhang Yuanyue Shen Yun Huang | 2023 | Horticulture Research2023，10，2： | 0 |
| 17 | Facile fabrication of ultrathin freestanding nanoporous Cu and Cu-Ag films with high SERS sensitivity by dealloying Mg-Cu(Ag)-Gd metallic glasses显示文摘Nanoporous metals prepared by dealloying have attracted increasing attention due to their interesting size-dependent physical,chemical,and biological properties.However,facile fabrication of metallic ultrathin freestanding nanoporous films(UF-NPFs)by dealloying is still challenging.Herein,we report a novel strategy of facile preparation of flexible Cu,Cu_(3)Ag,and CuAg UF-NPFs by dealloying thick Mg-Cu(Ag)-Gd metallic glass ribbons.During dealloying,the local reaction latent heat-induced glass transition of the precursor ribbons leads to the formation of a solid/liquid interface between the initially dealloyed nanoporous layer and the underlying supercooled liquid layer.Due to the bulging effect of in situ generated H2 on the solid/liquid interface,Cu,Cu_(3)Ag,and CuAg UF-NPFs with thicknesses of~200 nm can self-peel off from the outer surface of the dealloying ribbons.Moreover,it was found that the surfaceenhanced Raman scattering(SERS)detection limit of Rhodamine 6G(R6G)on the Cu and CuAg UF-NPF substrates are 10^(-6)M and 10^(-11)M,respectively,which are lower than most of the Cu and Cu-Ag substrates prepared by other methods.This work presents a reliable simple strategy to synthesize a variety of cost effective and flexible metallic UF-NPFs for functional applications. | Yuan-Yun Zhao Feng Qian Chengliang Zhao Chunxiao Xie Jianguo Wang Chuntao Chang Yanjun Li Lai-Chang Zhang | 2021 | Journal of Materials Science & Technology2021，，11： | 0 |
| 18 | Comparison in phytoplankton diversity-productivity-community stability between river-type reservoir and lake-type reservoir显示文摘Relationship between biodiversity and ecosystem function is one of the core issues in ecological research.Phytoplankton,as the main producer of aquatic ecosystem,its diversity,productivity,and community stability are of great signifi cance to reveal ecosystem function.There are signifi cant diff erences in hydrodynamics,water retention time,and phytoplankton community structure between river-type reservoir and newly built lake-type reservoir.The comparative analysis of phytoplankton community stability between the two types of reservoir has not been reported.Jiuquwan Reservoir(river-type)and Taihu Reservoir(lake-type),the two reservoirs in the Dongjiang River source area of Zhujiang(Pearl)River Basin,were selected for comparison in terms of multi-year operation vs.new impoundment,river-type vs.lake-type,and shallow water vs.sub-deep water reservoirs.Samples were collected in dry season(December 2019),normal season(March 2020),and wet season(August 2020),on which the phytoplankton diversity and productivity of the two reservoirs,and the relationship and diff erence of community stability were examined.Results show that(1)the number of phytoplankton species in Jiuquwan Reservoir decreased comparing that before algal bloom and the restoration treatment,while that in Taihu Reservoir increased compared with that before the impoundment of the reservoir.There was no signifi cant diff erence in functional groups and species number between the two reservoirs(P>0.05);(2)the biological stability,diversity,productivity,and resource utilization effi ciency of newly built lake-type reservoir were higher than those of multi-year river-type reservoir.In addition,the utilization effi ciency of phytoplankton resources was the highest in wet season in both reservoirs.The increases in biodiversity,richness,and evenness promoted the stability of the community,while increases in productivity and resource utilization effi ciency weakened the stability of the community;(3)community stability was aff ected by both biotic and abiotic factors,and hydrodynamic index was the main factor.This study is helpful to understand the relationship and diff erences in phytoplankton diversity,productivity and community stability in diff erent types of reservoirs,and provides a guidance for maintaining the stability of reservoir water ecosystem and protecting the biodiversity.The relationships between phytoplankton diversity,productivity,and community stability will be investigated in depth,for which a long-term observation will be conducted on the impact of environmental factors and diversity on the local biostability in diff erent types of reservoirs. | Qiong WU Qiuhua LI Huan LUO Qian CHEN Huaxiang CHEN Yanjun DONG Shenghua LI | 2022 | Journal of Oceanology and Limnology2022，40，4： | 0 |
| 19 | Facile synthesis of metal and alloy nanoparticles by ultrasound-assisted dealloying of metallic glasses显示文摘Metal and alloy nanoparticles synthesized by chemical reduction have attracted increasing attention due to their superior physical,chemical,and biological properties.However,most chemical synthesis processes rely on the use of harsh reducing agents and complicated chemical ingredients.Herein,we report a novel reduction-agent-free and surfactant(stabilizer)-free strategy to synthesize Cu,Ag,Au,Cu-Pt,Cu-Au,Cu-Au-Pt-Pd,and Au-Pt-Pd-Cu nanoparticles by ultrasound-assisted dealloying of Mgbased metallic glasses.The formation mechanism of the metal and alloy nanoparticles is revealed by a detailed investigation of sequential intermediate products.We demonstrate that the glass-liquid phase transition of the initially dealloying metallic glasses,together with the synergistic effect of dealloying and ultrasound-driven ligament-breakage of small enough nanoporous intermediates,play key roles in preparing the uniformly dispersed metal and alloy nanoparticles.This approach greatly simplifies the up-scaling synthesis of monometallic and bimetallic nanoparticles,and also provides a general strategy for synthesizing unprecedented multimetallic nanoparticles. | Yuan-Yun Zhao Feng Qian Wenfeng Shen Chengliang Zhao Jianguo Wang Chunxiao Xie Fengling Zhou Chuntao Chang Yanjun Li | 2021 | Journal of Materials Science & Technology2021，，23： | 0 |
| 20 | Kinetics of hexavalent chromium reduction by iron metal显示文摘The kinetics of Cr(VI)reduction to Cr(III)by metallic iron(Fe0)was studied in batch reactors for a range of reactant concentrations,pH and temperatures.Nearly 86.8%removal efficiency for Cr(VI)was achieved when Fe0 concentration was 6 g/L(using commercial iron powder(<200 mesh)in 120 min).The reduction of hexavalent chro-mium took place on the surface of the iron particles following pseudo-first order kinetics.The rate of Cr(VI)reduction increased with increasing Fe0 addition and temperature but inversely with initial pH.The pseudo-first-order rate coeffi-cients(kobs)were determined as 0.0024,0.010,0.0268 and 0.0628 min−1 when iron powder dosages were 2,6,10 and 14 g/L at 25°C and pH 5.5,respectively.According to the Arrehenius equation,the apparent activation energy of 26.5 kJ/mol and pre-exponential factor of 3330 min−1 were obtained at the temperature range of 288−308 K.Different Fe0 types were compared in this study.The reactivity was in the order starch-stabilized Fe0 nanoparticles>Fe0 nano-particles>Fe0 powder>Fe0 filings.Electrochemical analysis of the reaction process showed that Cr(III)and Fe(III)hydroxides should be the dominant final products. | Huijing QIAN Yanjun WU Yong LIU Xinhua XU | 2008 | Frontiers of Environmental Science & Engineering2008，2，1： | 0 |
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