Lee Sang-Ho, Kim Kyoung-Woong, Lee Byung-Tae, Bang Sunbaek, Kim Hyunseok, Kang Hyorang, Jang Am
School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123, Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Korea.
Mine Reclamation Corporation, 2, Segye-ro, Wonju-si, Gangwon-do 26464, Korea.
Int J Environ Res Public Health. 2015 Oct 26;12(10):13523-41. doi: 10.3390/ijerph121013523.
Arsenic contamination in drinking water has become an increasingly important issue due to its high toxicity to humans. The present study focuses on the development of the yttrium-based adsorbents, with basic yttrium carbonate (BYC), Ti-loaded basic yttrium carbonate (Ti-loaded BYC) and yttrium hydroxide prepared using a co-precipitation method. The Langmuir isotherm results confirmed the maximum adsorption capacity of Ti-loaded BYC (348.5 mg/g) was 25% higher than either BYC (289.6 mg/g) or yttrium hydroxide (206.5 mg/g) due to its increased specific surface area (82 m²/g) and surface charge (PZC: 8.4). Pseudo first- and second-order kinetic models further confirmed that the arsenate removal rate of Ti-loaded BYC was faster than for BYC and yttrium hydroxide. It was subsequently posited that the dominant removal mechanism of BYC and Ti-loaded BYC was the carbonate-arsenate ion exchange process, whereas yttrium hydroxide was regarded to be a co-precipitation process. The Ti-loaded BYC also displayed the highest adsorption affinity for a wide pH range (3-11) and in the presence of coexisting anionic species such as phosphate, silicate, and bicarbonate. Therefore, it is expected that Ti-loaded BYC can be used as an effective and practical adsorbent for arsenate remediation in drinking water.
由于砷对人体具有高毒性，饮用水中的砷污染已成为一个日益重要的问题。本研究重点关注基于钇的吸附剂的开发，采用共沉淀法制备了碱式碳酸钇（BYC）、负载钛的碱式碳酸钇（负载钛的BYC）和氢氧化钇。朗缪尔等温线结果证实，负载钛的BYC的最大吸附容量（348.5 mg/g）比BYC（289.6 mg/g）或氢氧化钇（206.5 mg/g）高25%，这归因于其比表面积（82 m²/g）和表面电荷（零电荷点：8.4）的增加。准一级和二级动力学模型进一步证实，负载钛的BYC对砷酸盐的去除速率比BYC和氢氧化钇更快。随后推测，BYC和负载钛的BYC的主要去除机制是碳酸根-砷酸根离子交换过程，而氢氧化钇被认为是共沉淀过程。负载钛的BYC在较宽的pH范围（3-11）以及存在共存阴离子物种（如磷酸盐、硅酸盐和碳酸氢盐）的情况下也表现出最高的吸附亲和力。因此，预计负载钛的BYC可作为一种有效且实用的吸附剂用于饮用水中砷酸盐的修复。
