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| 1 | Adsorption and desorption of Cu(Ⅱ) and Pb(Ⅱ) in paddy soils cultivated for various years in the subtropical China显示文摘The adsorption and desorption of Cu(Ⅱ) and Pb(Ⅱ) on upland red soil,and paddy soils which were originated from the upland soil and cultivated for 8,15,35 and 85 years,were investigated using the batch method.The study showed that the organic matter content and cation exchange capacity (CEC) of the soils are important factors controlling the adsorption and desorption of Cu(Ⅱ) and Pb(Ⅱ).The 15-Year paddy soil had the highest adsorption capacity for Pb(Ⅱ),followed by the 35-Year paddy soil.Both the 35-Year paddy soil and 15-Year paddy soil adsorbed more Cu(Ⅱ) than the upland soil and other paddy soils.The 15-Year paddy soils exhibited the highest desorption percentage for both Cu(Ⅱ) and Pb(Ⅱ).These results are consistent with the trend for the CEC of the soils tested.The high soil CEC contributes not only to the adsorption of Cu(Ⅱ) and Pb(Ⅱ) but also to the electrostatic adsorption of the two heavy metals by the soils.Lower desorption percentages for Cu(Ⅱ) (36.7% to 42.2%) and Pb(Ⅱ) (50.4% to 57.9%) were observed for the 85-Year paddy soil.The highest content of organic matter in the soil was responsible for the low desorption percentages for the two metals because the formation of the complexes between the organic matter and the metals could increase the stability of the heavy metals in the soils. | Liang Ma Renkou Xu Jun Jiang | 2010 | Journal of Environmental Sciences2010，22，5： | 21 |
| 2 | Effects of urea and(NH_4)_2 SO_4 on nitrification and acidification of Ultisols from Southern China显示文摘The mechanisms for the effects of ammonium-based fertilizers on soil acidification in subtropical regions are not well understood.Two Ultisols collected from cropland and a tea garden in Anhui and Jiangxi Provinces in subtropical southern China,respectively,were used to study the effects of urea and(NH 4) 2 SO 4 on the nitrification and acidification of soils with incubation experiments.Nitrification occurred at very low pH with no N fertilizer added and led to lowering of the soil pH by 0.53 and 0.30 units for the soils from Jiangxi and Anhui,respectively.Addition of urea accelerated nitrification and soil acidification in both Ultisols;while nitrification was inhibited by the addition of(NH 4) 2 SO 4,and greater input of(NH 4) 2 SO 4 led to greater inhibition of nitrification.Ammonia-oxidizing bacteria(AOB) played an important role in nitrification in cropland soil under acidic conditions.Addition of urea increased the soil pH at the early stages of incubation due to hydrolysis and stimulated the increase in the AOB population,and thus accelerated nitrification and soil acidification.At the end of incubation,the pH of Ultisol from Jiangxi had decreased by 1.25,1.54 and 1.84 units compared to maximum values for the treatments with 150,300 and 400 mg/kg of urea-N added,respectively;the corresponding figures were 0.95,1.25 and 1.69 for the Ultisol from Anhui.However,addition of(NH 4) 2 SO 4 inhibited the increase in the AOB population and thus inhibited nitrification and soil acidification.Soil pH for the treatments with 300 and 400 mg/kg of(NH 4) 2 SO 4-N remained almost constant during the incubation.AOB played an important role in nitrification of the cropland soil under acidic conditions.Addition of urea stimulated the increase in the AOB population and thus accelerated nitrification and soil acidification;while addition of(NH 4) 2 SO 4 inhibited the increase in the AOB population and thus inhibited nitrification. | Dell Tong Renkou Xu | 2012 | Journal of Environmental Sciences2012，24，4： | 21 |
| 3 | Adsorption of Cr(Ⅲ) from acidic solutions by crop straw derived biochars显示文摘Cr(III) adsorption by biochars generated from peanut, soybean, canola and rice straws is investigated with batch methods. Adsorption of Cr(III) increased as pH rose from 2.5 to 5.0. Adsorption of Cr(III) led to peak position shifts in the FTIR-PAS spectra of the biochars and made zeta potential values less negative, suggesting the formation of surface complexes between Cr3+and functional groups on the biochars. The adsorption capacity of Cr(III) followed the order: peanut straw char > soybean straw char > canola straw char > rice straw char, which was consistent with the content of acidic functional groups on the biochars. The increase in Cr3+hydrolysis as the pH rose was one of the main reasons for the increased adsorption of Cr(III) by the biochars at higher pH values. Cr(III) can be adsorbed by the biochars through electrostatic attraction between negative surfaces and Cr3+, but the relative contribution of electrostatic adsorption was less than 5%. Therefore, Cr(III) was mainly adsorbed by the biochars through specific adsorption. The Langumir and Freundlich equations fitted the adsorption isotherms well and can therefore be used to describe the adsorption behavior of Cr(III) by the crop straw biochars. The crop straw biochars have great adsorption capacities for Cr(III) under acidic conditions and can be used as adsorbents to remove Cr(III) from acidic wastewaters. | Jingjian Pan Jun Jiang Renkou Xu | 2013 | Journal of Environmental Sciences2013，25，10： | 19 |
| 4 | Rice Straw-Derived Biochar Properties and Functions as Cu(Ⅱ) and Cyromazine Sorbents as Influenced by Pyrolysis Temperature显示文摘In this study, biochars from rice straw(Oryza sativa L.) were prepared at 200–600?C by oxygen-limited pyrolysis to investigate the changes in properties of rice straw biochars produced at different temperatures, and to examine the adsorption capacities of the biochars for a heavy metal, copper(Ⅱ)(Cu(Ⅱ)), and an organic insecticide of cyromazine, as well as to further reveal the adsorption mechanisms.The results obtained with batch experiments showed that the amount of Cu(Ⅱ) adsorbed varied with the pyrolysis temperatures of rice straw biochar. The biochar produced at 400?C had the largest adsorption capacity for Cu(Ⅱ)(0.37 mol kg-1) among the biochars,with the non-electrostatic adsorption as the main adsorption mechanism. The highest adsorption capacity for cyromazine(156.42 g kg-1) was found in the rice straw biochar produced at 600?C, and cyromazine adsorption was exclusively predominated by surface adsorption. An obvious competitive adsorption was found between 5 mmol L-1Cu(II) and 2 g L-1cyromazine when they were in the binary solute system. Biochar may be used to remediate heavy metal- and organic insecticide-contaminated water, while the pyrolysis temperature of feedstocks for producing biochar should be considered for the restoration of multi-contamination. | JIANG Jun Yongbo PENG YUAN Min HONG Zhineng WANG Dejian XU Renkou | 2015 | Pedosphere2015，25，5： | 7 |
| 5 | Removal of Cu(Ⅱ) from acidic electroplating effluent by biochars generated from crop straws显示文摘The removal efficiency of copper(Cu(Ⅱ)) from an actual acidic electroplating effluent by biochars generated from canola,rice,soybean and peanut straws was investigated.The biochars simultaneously removed Cu(Ⅱ) from the effluent,mainly through the mechanisms of adsorption and precipitation,and neutralized its acidity.The removal efficiency of Cu(Ⅱ) by the biochars followed the order:peanut straw char > soybean straw char > canola straw char > rice straw char a commercial activated carbonaceous material,which is consistent with the alkalinity of the biochars.The pH of the effluent was a key factor determining the removal efficiency of Cu(Ⅱ) by biochars.Raising the initial pH of the effluent enhanced the removal of Cu(Ⅱ) from it.The optimum pyrolysis temperature was 400°C for producing biochar from crop straws for acidic wastewater treatment,and the optimum reaction time was 8 hr. | Xuejiao Tong Renkou Xu | 2013 | Journal of Environmental Sciences2013，25，4： | 6 |
| 6 | Effect of ionic strength on adsorption of As(Ⅲ) and As(V) on variable charge soils显示文摘The study was to investigate the adsorption behavior of arsenite (As(III)) and arsenate (As(V)) on two variable charge soils, i.e., Haplic Acrisol and Rhodic Ferralsol at dierent ionic strengths and pH with batch methods. Results indicated that the amount of As(III) adsorbed by these two soils increased with increasing solution pH, whereas it decreased with increasing ionic strength under the acidic condition. This suggested that As(III) was mainly adsorbed on soil positive charge sites through electrostatic attraction under the acidic condition. Moreover, intersects of As(V) adsorption-pH curves at dierent ionic strengths (a characteristic pH) are obtained for both soils. It was noted that above this pH, the adsorption of As(V) was increased with increasing ionic strength, whereas below it the reverse trend was true. Precisely the intersect pH was 3.6 for Haplic Acrisol and 4.5 for Rhodic Ferralsol, which was near the values of PZSE (soil point of zero salt eect) of these soils. The eects of ionic strength and pH on arsenate adsorption by these soils were interpreted by the adsorption model. The results of zeta potential suggested that the potential in adsorption plane becomes less negative with increasing ionic strength above soil PZSE and decreases with increasing ionic strength below soil PZSE. These results further supported the hypothesis of the adsorption model that the potential in the adsorption plane changes with ionic strength with an opposite trend to surface charge of the soils. Therefore, the change of the potential in the adsorption plane was mainly responsible for the change of arsenate adsorption induced by ionic strength on variable charge soils. | XU Renkou WANG Yong TIWARI Diwakar WANG Houyan | 2009 | Journal of Environmental Sciences2009，21，7： | 5 |
| 7 | Characteristics of biomass ashes from different materials and their ameliorative effects on acid soils显示文摘The chemical characteristics,element contents,mineral compositions,and the ameliorative effects on acid soils of five biomass ashes from different materials were analyzed. The chemical properties of the ashes varied depending on the source biomass material. An increase in the concrete shuttering contents in the biomass materials led to higher alkalinity,and higher Ca and Mg levels in biomass ashes,which made them particularly good at ameliorating effects on soil acidity. However,heavy metal contents,such as Cr,Cu,and Zn in the ashes,were relatively high. The incorporation of all ashes increased soil p H,exchangeable base cations,and available phosphorus,but decreased soil exchangeable acidity. The application of the ashes from biomass materials with a high concrete shuttering content increased the soil available heavy metal contents. Therefore,the biomass ashes from wood and crop residues with low concrete contents were the better acid soil amendments. | Renyong Shi Jiuyu Li Jun Jiang Khalid Mehmood Yuan Liu Renkou Xu Wei Qian | 2017 | Journal of Environmental Sciences2017，29，5： | 5 |
| 8 | Aluminum-Enhanced Proton Release Associated with Plasma Membrane H^+-Adenosine Triphosphatase Activity and Excess Cation Uptake in Tea (Camellia sinensis) Plant Roots显示文摘Cultivated tea(Camellia sinensis) plants acidify the rhizosphere, and Aluminum(Al) toxicity is recognized as a major limiting factor for plant growth in acidic soils. However, the mechanisms responsible for rhizosphere acidification associated with Al have not been fully elucidated. The present study examined the effect of Al on root-induced rhizosphere acidification, plasma membrane H^+-adenosine triphosphatase(H^+-ATPase) activity, and cation-anion balance in tea plant roots. The exudation of H^+from tea plant roots with or without Al treatment was visualized using an agar sheet with bromocresol purple. The H^+-ATPase activity of plasma membranes isolated from the roots was measured after hydrolysis using the two-phase partition system. The Al treatment strongly enhanced the exudation of H^+, and the acidification of tea plant roots by Al was closely associated with plasma membrane H^+-ATPase activity. The root plasma membrane H^+-ATPase activity increased with Al concentration. The Al content, amount of protons released, and H^+-ATPase activity were significantly higher in roots treated with Al than in those untreated. The results of the cation-anion balance in roots showed an excess of cations relative to anions, with the amount of excess cation uptake increasing with increasing Al concentrations. These suggest that Al-enhanced proton release is associated with plasma membrane H^+-ATPase activity and excess cation uptake. Findings of this study would provide insights into the contributing factors of soil acidification in tea plantations. | WAN Qing MI Yuhe YANG Yiyang Xu Renkou LI Xinghui | 2018 | Pedosphere2018，28，5： | 5 |
| 9 | Effect of low molecular weight organic acids on adsorption and desorptionof fluoride on variable charge soils显示文摘 | Renkou Xu Yayun Wang Anzhen Zhao Guoliang Ji Hong Zhang | 2006 | Environmental Geochemistry and Health2006，，1： | 1 |
| 10 | Mechanism of aluminum release from variable charge soils induced by low-molecular-weight organic acids: Kinetic study显示文摘 | Jiuyu Li Renkou Xu Diwakar Tiwari Guoliang Ji | 2006 | Geochimica et Cosmochimica Acta2006，，11： | 1 |
| 11 | The forms of alkalis in the biochar produced from crop residues at difforent temperatures显示文摘 | Yuan Jinhua Xu Renkou Zhang Hong | 2011 | Bioresource Technology2011，102，3： | 1 |
| 12 | Comparison of the ameliorating effects on an acidic ultisol between four crop straws and their biochars显示文摘 | YUAN Jinhua XU Renkou QIN Wei | | 0，，05： | 1 |
| 13 | Effect of low molecular weight organic acids on adsorption and desorption of fluoride on variable charge soils显示文摘 | Renkou Xu Yayun Wang Anzhen Zhao Guoliang Ji Hong Zhang | 2006 | Environmental Geochemistry and Health (-)2006，，1： | 1 |
| 14 | Adsorption of Pb(Ⅱ) on variable charge soils amended with rice-straw de- rived biochar显示文摘 | JIANG Tianyu JIANG Jun'XU Renkou | 2012 | Chemosphere2012，89，3： | 1 |
| 15 | The melioration effects of low temperature biochar generated frnm nine crop residues on an acidic Ultisol显示文摘 | YUAN Jinhua XU Renkou | | 0，，01： | 1 |
| 16 | The forms of alkalis in the biochar produced from crop residues at dif- ferent temperatures显示文摘 | Yuan Jinhua Xu Renkou Zhang Hong | 2011 | Bioresource Technology2011，102，3： | 1 |
| 17 | pH buffering capacity of acid soils from tropical and subtropical regions of China as influenced by incorporation of crop straw biochars显示文摘 | XU Renkou ZHAO Anzhen YUAN Jinhua a al | | 0，，04： | 1 |
| 18 | The forms of alkalis in the biochar produced from crop residues at different temperatures显示文摘 | YUAN Jinhua XU Renkou ZHANG Hong | 2011 | Bioresource Technology2011，102，3： | 1 |
| 19 | Immobilization of Cu(Ⅱ),Pb(Ⅱ) and Cd(Ⅱ) by the addition of rice straw derived biochar to a simulated polluted ultisol显示文摘 | JIANG JunfXU Renkou JIANG Tianyu | 2012 | Journal of Hazardous Materials2012，，： | 1 |
| 20 | Effect of low molecular weight organic acids on adsorption and desorption of fluoride on variable charge soils显示文摘 | Xu Renkou Wang Yayun Zhan Anzhen | 2006 | Environmental Geochemistry and Health2006，28，： | 1 |
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