Department of Environmental Engineering, Pukyong National University, Busan, Republic of Korea.
Environ Technol. 2011 Aug-Sep;32(11-12):1195-203. doi: 10.1080/09593330.2010.531055.
This study sought to determine optimum conditions for the microwave exfoliation of raw vermiculite and examined the removal characteristics of copper ions from water by the processed vermiculite. When 100 g of raw vermiculite was irradiated at 440 W for 330 s, 66% of the raw vermiculite was exfoliated. The dry density and specific surface area of the exfoliated vermiculite were 0.28 g/cm3 and 54.6 m2/g, respectively. When considering the dry density (2.78 g/cm3) and specific surface area (11.1 m2/g) of the raw vermiculite, microwave irradiation resulted in an approximate 10 times expansion and a five-fold increase in specific surface area. Serial batch tests were conducted to determine the removal characteristics of the exfoliated vermiculite for copper ions in aqueous solutions. Copper was most effectively removed by exfoliated vermiculite with an initial pH of 5. Exfoliated vermiculite at this pH also produced the highest first-order rate constants and instantaneous partition coefficient. These results indicate that exfoliated vermiculite can be prepared by microwave irradiation instead of conventional heat processes for use as a copper ion adsorbent.
本研究旨在确定原蛭石微波剥离的最佳条件，并考察处理后的蛭石对水中铜离子的去除特性。当 100g 原蛭石在 440W 下辐照 330s 时，有 66%的原蛭石被剥离。剥离蛭石的干密度和比表面积分别为 0.28g/cm3 和 54.6m2/g。考虑到原蛭石的干密度（2.78g/cm3）和比表面积（11.1m2/g），微波辐照导致其体积膨胀约 10 倍，比表面积增加 5 倍。进行了一系列分批试验，以确定剥离蛭石对水溶液中铜离子的去除特性。在初始 pH 值为 5 时，剥离蛭石对铜的去除效果最佳。在该 pH 值下，剥离蛭石的一阶速率常数和瞬间分配系数也最高。这些结果表明，可通过微波辐照制备剥离蛭石，替代传统的热工艺，用作铜离子吸附剂。
