生物膜载体吸附剂对Cr^(3+)的吸附动力学研究

Research on Adsorption Kinetics of Chromium(III) on Biofilm Carrier Sorbent

生物膜载体吸附重金属离子是目前发展起来的一种新型废水处理方法.该文对生物膜吸附Cr3+的行为进行了准一级动力学方程和Elovich模型方程的拟合,对吸附等温线作了测定.结果表明,Cr3+在生物膜载体吸附剂上的吸附过程与Elovich方程有较好的拟合度(R2=0.97466),吸附等温模型与L-F平衡方程吻合较好(R2=0.9845).实验中考察了pH及温度对生物膜吸附Cr3+的影响.结果表明,pH=4～6,在室温20℃去除率可达到87%以上.

The heavy metal ions adsorbed by biofilm carrier is a novel promising wastewater treatment. Regarding the adsorptive behavior of biofilm adsorbing Cr^3+ , the pseudo-first-order kinetic equation and Elovich model were applied explicitly, meanwhile the adsorption isotherm was measured. The results show the adsorptive process can be simulated by Elovich kinetics model preferably (R2=~0.974?66 ) and adsorption isotherm can be described by L-F equilibrium adsorption equation(R2=~0.984?5 ). The influence of pH and temperature on biofilm adsorbing Cr^3+ were reviewed in the experiment. The results show pH between 4 and 6, room temperature around 20℃ could reach preferable adsorptive rate above 87%.