XIANG Wenying
Key Laboratory of Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China;National Centre for International Research of Low-carbon and Green Buildings, Chongqing University, Chongqing 400045, P. R. ChinaLI Ning
Key Laboratory of Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. ChinaDENG Guobin
Key Laboratory of Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. ChinaXIE Bingbing
Key Laboratory of Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. ChinaTo remove Ni(Ⅱ) in wastewater more effectively and economically, soybean straw with low cost is chosen to make biochar to absorb Ni(Ⅱ). The effects of carbonization temperature, solution pH, adsorbent dosage, solution temperature and Cd(Ⅱ) concentration on the adsorption are investigated to find the optimal adsorption condition. A new method for removing heavy metal nickel is developed, and the adsorption kinetics and adsorption isotherm are studied. The experimental results show that the adsorption performance of the adsorbent is good, and when Ni (Ⅱ) concentration is 20 mg/L, carbonization temperature is 500℃, pH is 7, dosage is 0.2 g, temperature keeps at 25℃ and the concentration of Cd (Ⅱ) is 0, the adsorption condition is the best. The adsorption reaction accords with the second-order kinetics equation. The adsorption isotherm accords with Langmuir model, and the saturated adsorption capacity is 14.38 mg/L at 25℃. Scanning electron microscope analysis shows that the pore structure of straw, the surface roughness and the specific surface area increase, which improves the adsorption performance.
向文英,李宁,邓国斌,谢冰冰.大豆秸秆生物炭对废水中Ni(II)的吸附性能[J].重庆大学学报,2017,40(10):99~107
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