Department of Polymer Science and Technology, University of Calcutta, Kolkata, India.
J Hazard Mater. 2012 Aug 15;227-228:68-78. doi: 10.1016/j.jhazmat.2012.05.001. Epub 2012 May 8.
An arsenic adsorbent comprising alumina nanoparticles dispersed in polymer matrix was developed and its removal potential studied. Alumina nanoparticles were prepared by reverse microemulsion technique and these were immobilized on chitosan grafted polyacrylamide matrix by in situ dispersion. The loading capacity of this new synthesized adsorbent was found to be high (6.56 mg/g). Batch adsorption studies were performed as a function of contact time, initial arsenic concentration, pH and presence of competing anions. The removal was found to be pH dependent, and maximum removal was obtained at pH 7.2 while the equilibrium time was 6h. The equilibrium adsorption data fitted very well with Freundlich isotherm. However, the D-R isotherm studies indicated that chemisorptions might play an important role. This was also confirmed by the FTIR study of the arsenic loaded adsorbent. A mechanism of arsenic sorption by the new polymeric adsorbent has been proposed. The regeneration study of the adsorbent resulted in retention of 94% capacity in the fifth cycle. An optimum pH of 7.2, operation at normal temperature, high adsorption capacity and good recycle potential of this new adsorbent would make it an ideal material for removal of arsenic from drinking water.
研制了一种砷吸附剂，由分散在聚合物基质中的氧化铝纳米粒子组成，并研究了其去除潜力。通过反相微乳液技术制备氧化铝纳米粒子，并通过原位分散将其固定在壳聚糖接枝聚丙烯酰胺基质上。这种新合成的吸附剂的负载能力很高（6.56mg/g）。进行了批量吸附研究，作为接触时间、初始砷浓度、pH 值和共存竞争阴离子的函数。去除率随 pH 值而变化，在 pH 值为 7.2 时达到最大去除率，平衡时间为 6 小时。平衡吸附数据非常符合 Freundlich 等温线。然而，D-R 等温线研究表明，化学吸附可能起重要作用。这也通过负载砷的吸附剂的傅里叶变换红外光谱研究得到证实。提出了一种新型聚合物吸附剂对砷的吸附机理。吸附剂的再生研究在第五个循环中保留了 94%的容量。这种新型吸附剂的最佳 pH 值为 7.2，在常温下运行，吸附容量高，循环潜力好，将使其成为从饮用水中去除砷的理想材料。
