Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.
J Hazard Mater. 2013 May 15;252-253:192-7. doi: 10.1016/j.jhazmat.2013.03.002. Epub 2013 Mar 14.
The major concern limiting the industrial application of organo-bentonite in powder form (P-Bent) for wastewater treatment is that it is difficult to separate it from treated water by settlement. To address this problem, a novel approach for synthesizing immobilized organo-bentonite in globular form (G-Bent) is proposed. The G-Bent is modified using the cationic surfactant cetylpyridinium chloride (CPC) and immobilized by polyvinyl alcohol (PVA). The removal of 2-naphthol by G-Bent was compared with removal by P-Bent for solid/liquid separation, removal efficiency and desorption of the modifier used in its preparation. Results indicated that G-Bent was easy to recover from treated wastewater, and was effective and reusable in removing 2-naphthol. The percentage of 2-naphthol removed by G-Bent exceeded 90% with the cationic exchange capacity (CEC) loadings ranging from 100% to 150%. This was almost equivalent to the results obtained using P-Bent. In the five rounds of reuse examined, the percentage of 2-naphthol removed was maintained above 50% for 150%-G-Bent. The percentage of CPC desorption was less than 0.75% after five rounds of reuse and no PVA was detected. The results of this work provide novel information for using G-Bent in the treatment of wastewater containing organic contaminants.
将有机膨润土粉末（P-Bent）应用于工业废水处理的主要问题是难以通过沉降将其与处理后的水分离。为了解决这个问题，提出了一种合成球形固定化有机膨润土（G-Bent）的新方法。用阳离子表面活性剂十六烷基吡啶氯（CPC）对 G-Bent 进行改性，并通过聚乙烯醇（PVA）进行固定化。比较了 G-Bent 对 2-萘酚的去除效果与 P-Bent 的去除效果，包括固液分离、去除效率和制备中所用改性剂的解吸效果。结果表明，G-Bent 易于从处理后的废水中回收，并且在去除 2-萘酚方面有效且可重复使用。G-Bent 的阳离子交换容量（CEC）负载率在 100%到 150%之间时，去除 2-萘酚的百分比超过 90%。这几乎与使用 P-Bent 得到的结果相当。在考察的五轮重复使用中，150%-G-Bent 的 2-萘酚去除率保持在 50%以上。重复使用五轮后，CPC 的解吸率低于 0.75%，且未检测到 PVA。这项工作的结果为使用 G-Bent 处理含有有机污染物的废水提供了新的信息。
