论文部分内容阅读
以蓖麻秸秆粉末为吸附剂,采用批量平衡法,研究固液比、pH、重金属离子初始质量浓度对蓖麻秸秆粉末吸附Pb,Hg,Cd和Ni离子的影响,探讨蓖麻秸秆粉末对4种重金属离子的等温吸附和吸附动力学特征。结果表明:Langmuir、Freundlich和Temkin模型能更好地描述蓖麻秸秆粉末对Pb的吸附,Langmuir和Temkin模型能更好地描述蓖麻秸秆粉末对Hg和Cd的吸附,Langmuir模型能更好地描述蓖麻秸秆粉末对Ni的吸附;蓖麻秸秆粉末对4种重金属离子的最大吸附量分别是209.60、129.41、62.78和25.86mg/g;准一级动力学、准二级动力学和叶洛维奇方程能很好地描述蓖麻秸秆粉末对Pb,Hg,Cd和Ni离子的吸附过程。蓖麻秸秆粉末可用于处理多种重金属离子污染的废水。
The effects of solid-liquid ratio, pH and initial concentration of heavy metal ions on Pb, Hg, Cd and Ni ions adsorption on castor straw powder were studied by using batch equilibrium method with castor straw powder as adsorbent. Isothermal adsorption and adsorption kinetics of heavy metal ions. The results show that Langmuir, Freundlich and Temkin models can better describe the adsorption of Pb on castor straw powder, Langmuir and Temkin models can better describe the adsorption of Hg and Cd by castor straw powder, and Langmuir model can better describe Castor straw powder on Ni adsorption; the maximum adsorption capacity of castor straw powder to four kinds of heavy metal ions were 209.60, 129.41, 62.78 and 25.86 mg / g respectively; quasi-first-order kinetics, quasi-second order kinetics, Odd equation can well describe the adsorption of Pb, Hg, Cd and Ni ions by castor straw powder. Castor straw powder can be used to treat a variety of heavy metal ions contaminated wastewater.