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| 1 | Influence of colloidal nanosilica on hydration kinetics and properties of CaO/CaSO_(4)-activated slag binder显示文摘To solve the energy consumption and CO_(2) emission during cement production,the new binders must be developed as an alternative to cement.CaO/CaSO_(4)-activated slag binder is an eco-friendly and safe cementitious material;however,its low strength during initial stages limits its applications.In this study,colloidal nanosilica(CNS)was employed as an additive to improve the strength of CaO/CaSO_(4)-activated slag binder,and the effects of CNS on the workability,hydration kinetics,hydration products(type,quantity,and polymerization degree),and binder microstructure were thoroughly investigated.A moderate CNS content,through its nucleation effect,significantly increased the hydration rate of the nucleation and crystal growth(NG),phase boundary interaction(I)and diffusion(D)processes,which generated large quantities of calcium aluminosilicate hydrate(C-A-S-H)gel in the initial hydration stage.Meanwhile,the addition of CNS improved the polymerization degree of C-A-S-H gel.This amorphous reactant well-filled the pore space between slag particles and yielded a compact microstructure,consequently enhancing the binder strength.Considering the reduction in fluidity and the increase in production cost,the CNS mass fraction was controlled as3%,and the binder reached the satisfactory strengths of 3.87,24.47,31.43,and 41.78 MPa at 1,3,7,and 28 d,respectively. | Qing Liu Qingming He Ruoyun Li Yanfei Feng Xianjun Lyu Junxiang Wang Lin Li | 2022 | International Journal of Mining Science and Technology2022，32，6： | 0 |
| 2 | Photocatalytic water splitting of ternary graphene-like photocatalyst for the photocatalytic hydrogen production显示文摘In recent times,there has been an increasing demand for energy which has resulted in an increased consumption of fossil fuels thereby posing a number of challenges to the environment.In the course finding possible solutions to this environmental canker,solar photocatalytic water splitting to produce hydrogen gas has been identified as one of the most promising methods for generating renewable energy.To retard the recombination of photogenerated carriers and improve the efficiency of photocatalysis,the present paper reports a facile method called the hydrothermal method,which wa s used to prepare ternary graphene-like photocatalyst.A“Design Expert”was used to investigate the influence of the loading weight of Mo and GO as well as the temperature of hydrothermal reaction and their interactions on the evolution of hydrogen(H 2)in 4 h.The experimental results showed that the ternary graphene-like photocatalyst has a strong photocatalytic hydrogen production activity compared to that of pure SiC.In particular,the catalyst added 2.5 wt%of GO weight yielded the highest quantum of 21.69%at 400-700 nm of wavelength.The optimal evolution H2 in 4 h conditions was obtained as follows:The loading weight of Mo was 8.19 wt%,the loading weight of GO was 2.02 wt%,the temperature of the hydrothermal reaction was 200.93℃.Under the optimum conditions,the evolution of H2 in 4h could reach 4.2030 mL. | Yan Zhang Yuyan Zhang Xue Li Xiaohan Zhao Cosmos Anning John Crittenden Xianjun Lyu | 2020 | Frontiers of Environmental Science & Engineering2020，14，4： | 0 |
| 3 | Effects of Solution Chemistry Conditions and Adsorbent Surface Properties on Adsorption of Ni(Ⅱ) on Laiyang Bentonite显示文摘The effects of solution chemistry conditions and adsorbent surface properties on the adsorption of Ni(II) on Laiyang bentonite were investigated via the batch technique. Potentiometric and mass titration techniques were employed in the batch experimental methods, and the results showed that the point of zero net proton charge(PZNPC) of bentonite at different ionic strength denoted p HPZNPC to be 8.2±0.1. The removal of Ni(II) from the solution increased with an increasing bentonite dosage, with the maximum removal efficiency equating up to 99%. The adsorption of Ni(II) on bentonite increased with an increasing p H value at a p H value of <8.5, and reached a Ni(II) removal efficiency of >99% at a p H value of >10.2. The Ni(II) adsorption performance exhibited different responses to cations(K+, Na+) but was not influenced by the background anions(NO3-, Cl-, and Cl O4-). The adsorption of Ni(II) was dominated by the outer-sphere surface complexation and ion exchange with Na+/H+ on bentonite surface at low p H value, whereas the inner-sphere surface complexation and surface precipitation were the main adsorption mechanisms at high p H value. The adsorption isotherms of Ni(II) on bentonite can be described well by the Langmuir model. The thermodynamic parameters of adsorption, including the Gibbs free energy, the enthalpy change, and the entropy change, at different temperatures indicated that the adsorption of Ni(II) on bentonite was endothermic and spontaneous. | Cao Xiaoqiang Yan Bingqi Xue Jianliang Wang Qian Wang Yaping Huang Yongqing Zhang Yan Lyu Xianjun | 2016 | China Petroleum Processing & Petrochemical Technology2016，18，3： | 0 |
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