Olatunji Michael Adekunle, Khandaker Mayeen Uddin, Amin Yusoff Mohd, Mahmud Habibun Nabi Muhammad Ekramul
Applied Radiation Laboratory, Department of Physics, University of Malaya, Kuala Lumpur, Malaysia.
Polymer Laboratory, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia.
PLoS One. 2016 Oct 5;11(10):e0164119. doi: 10.1371/journal.pone.0164119. eCollection 2016.
A radiotracer study was conducted to investigate the removal characteristics of cadmium (109Cd) from aqueous solution by polypyrrole/ sawdust composite. Several factors such as solution pH, sorbent dosage, initial concentration, contact time, temperature and interfering metal ions were found to have influence on the adsorption process. The kinetics of adsorption was relatively fast, reaching equilibrium within 3 hours. A lowering of the solution pH reduced the removal efficiency from 99.3 to ~ 46.7% and an ambient temperature of 25°C was found to be optimum for maximum adsorption. The presence of sodium and potassium ions inhibited 109Cd removal from its aqueous solution. The experimental data for 109Cd adsorption showed a very good agreement with the Langmuir isotherm and a pseudo-first order kinetic model. The surface condition of the adsorbent before and after cadmium loading was investigated using BET, FESEM and FTIR. Considering the low cost of the precursor's materials and the toxicity of 109Cd radioactive metal, polypyrrole synthesized on the sawdust of Dryobalanops aromatic could be used as an efficient adsorbent for the removal of 109Cd radioisotope from radionuclide-containing effluents.
进行了一项放射性示踪剂研究，以考察聚吡咯/锯末复合材料从水溶液中去除镉（109Cd）的特性。发现溶液pH值、吸附剂用量、初始浓度、接触时间、温度和干扰金属离子等几个因素对吸附过程有影响。吸附动力学相对较快，在3小时内达到平衡。溶液pH值降低会使去除效率从99.3%降至约46.7%，发现25°C的环境温度最有利于最大吸附量。钠和钾离子的存在会抑制109Cd从其水溶液中的去除。109Cd吸附的实验数据与朗缪尔等温线和准一级动力学模型非常吻合。使用BET、FESEM和FTIR研究了镉负载前后吸附剂的表面状况。考虑到前驱体材料成本低以及109Cd放射性金属的毒性，在龙脑香锯末上合成的聚吡咯可作为一种高效吸附剂，用于从含放射性核素的废水中去除109Cd放射性同位素。
