Lin Chin Jung, Lo Shang-Lien, Liou Ya Hsuan
Research Center for Environmental Pollution Prevention and Control Technology, Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan, ROC.
Chemosphere. 2005 Jun;59(9):1299-307. doi: 10.1016/j.chemosphere.2004.11.064. Epub 2005 Jan 25.
Nanoscale zerovalent copper supported on a cation resin was successfully synthesized to enhance the removal of carbon tetrachloride (CCl(4)) from contaminated water. The use of the cation resin as a support prevents the reduction of surface area due to agglomeration of nanoscale zerovalent copper particles. Moreover, the cation resin recycles the copper ions resulting from the reaction between CCl(4) and Cu(0) by simultaneous ion exchange. The decline in the amount of CCl(4) in aqueous solution results from the combined effects of degradation by nanoscale zerovalent copper and sorption by the cation resin; thus the amount of CCl(4) both in aqueous solution and sorbed onto the resin were measured. The pseudo-first-order rate constant normalized by the surface-area and the mass concentration of nanoscale zerovalent copper (k(SA)) was 2.1+/-0.1 x 10(-2)lh(-1)m(-2), approximately twenty times that of commercial powdered zerovalent copper (0.04 mm). Due to the exchange between Cu(2+) and the strongly acidic ions (H(+) or Na(+)), the pH was between 3 and 4 in unbuffered solution and Cu(2+) at the concentration of less than 0.1 mg l(-1) was measured after the dechlorination reaction. In the above-ground application, resin as a support would facilitate the development of a process that could be designed for convenient emplacement and regeneration of porous reductive medium.
成功合成了负载在阳离子树脂上的纳米级零价铜，以提高从受污染水中去除四氯化碳（CCl₄）的能力。使用阳离子树脂作为载体可防止由于纳米级零价铜颗粒的团聚而导致表面积减小。此外，阳离子树脂通过同时进行离子交换来回收由CCl₄与Cu(0)反应产生的铜离子。水溶液中CCl₄含量的下降是纳米级零价铜降解和阳离子树脂吸附共同作用的结果；因此，对水溶液中和吸附在树脂上的CCl₄量都进行了测量。以纳米级零价铜的表面积和质量浓度归一化后的准一级速率常数（k(SA)）为2.1±0.1×10⁻² l h⁻¹ m⁻²，约为商业粉末状零价铜（0.04 mm）的20倍。由于Cu(2+)与强酸性离子（H⁺或Na⁺）之间的交换，在未缓冲的溶液中pH值在3至4之间，脱氯反应后测得Cu(2+)浓度小于0.1 mg l⁻¹。在地面应用中，树脂作为载体将有助于开发一种可设计用于方便多孔还原介质放置和再生的工艺。
