锰铁氧体/生物炭的制备及其对Pb^(2+)吸附性能的研究

Synthesis of biochar loaded with manganese ferrite and their performance for Pb^(2+) removal

利用水热法合成了锰铁氧体/生物炭吸附材料(FBC),用于去除溶液中Pb^(2+)离子。通过傅里叶变换红外光谱仪对吸附前后FBC进行表征分析,研究了溶液初始pH、溶液初始质量浓度、吸附时间等对Pb^(2+)离子吸附的影响,探讨了吸附动力学特性和吸附等温线特性。结果表明:温度为25℃,FBC吸附Pb^(2+)离子在120min内即可达到吸附平衡,最大吸附量为126.1mg/g;吸附过程符合准二级动力学方程和Langmuir等温吸附方程,说明FBC对Pb^(2+)离子的吸附过程主要是单分子层化学吸附。再生吸附实验结果显示,重复利用5次后,FBC对Pb^(2+)离子的吸附量超过70mg/g,表现出良好的再生性能。

Biochar loaded with manganese ferrite（FBC）was prepared by hydrothermal synthesis,and applied in Pb2+removal from synthetic wastewater.The product was characterized by fourier tansform infrared（FT-IR）.Effect factors,such as pH,initial concentration of Pb2+,contact time and adsorption kinetics,adsorption isotherms on FBC adsorption for Pb2+ were investigated.The adsorption equilibrium of Pb2+ was achieved after 120 min at 25℃,and the maximum adsorption capacity was 126.1 mg/g.The adsorption process which followed the pseudo-second-order kinetics and Langmuir isotherm equation showed that monomolecular chemisorption played dominant role in Pb2+ adsorption.The desorption result indicated that the adsorption capacities of FBC could still reach up to 70 mg/g by five repetition tests.