Kagne S, Jagtap S, Dhawade P, Kamble S P, Devotta S, Rayalu S S
Environmental Materials Unit, National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India.
J Hazard Mater. 2008 Jun 15;154(1-3):88-95. doi: 10.1016/j.jhazmat.2007.09.111. Epub 2007 Oct 2.
The present study was carried out to investigate the potential of cement hydrated at various time intervals for the removal of excess F- from aqueous solution by using batch adsorption studies. The influence of different adsorption parameters, viz. effect of adsorbent dose, initial concentration, pH, interfering ions and contact time were studied for their optimization. It was observed that the adsorbent exhibited reasonably significant F- removal over a wide range of pH. The presence of carbonate and bicarbonate ions in aqueous solution were found to affect the F- removal indicating that these anions compete with the sorption of F- on adsorbent. The equilibrium adsorption data were fitted well for both the Freundlich and Langmuir isotherms and the adsorption capacities were calculated. Comparative studies for F- removal in simulated and field water show relatively higher F- removal in simulated water. XRD and SEM patterns of the hydrated cement were recorded to get better insight into the mechanism of adsorption process. From the experimental results, it may be concluded that HC was an efficient and economical adsorbent for F- removal.
本研究通过批量吸附研究来考察在不同时间间隔水化的水泥从水溶液中去除过量氟离子的潜力。研究了不同吸附参数的影响，即吸附剂剂量、初始浓度、pH值、干扰离子和接触时间的影响，以进行优化。结果表明，该吸附剂在较宽的pH范围内表现出相当显著的氟离子去除效果。发现水溶液中碳酸根离子和碳酸氢根离子的存在会影响氟离子的去除，表明这些阴离子与氟离子在吸附剂上的吸附存在竞争。Freundlich和Langmuir等温线对平衡吸附数据拟合良好，并计算了吸附容量。模拟水和现场水中氟离子去除的对比研究表明，模拟水中氟离子的去除率相对较高。记录了水化水泥的XRD和SEM图谱，以更好地了解吸附过程的机理。从实验结果可以得出结论，水化水泥是一种高效且经济的氟离子去除吸附剂。
