摘要
重金属因其潜在的生物毒性和高污染风险给水源地水质安全与城市饮用水安全保障带来严重威胁。活性炭吸附法去除水中重金属离子较其他方法具有高效性、化学污泥减量化、低温适应能力强、可实现重金属回收等优点而得到广泛应用。本文以六价铬为典型污染物,分析其化学特性及毒理学性质,阐述活性炭吸附水中Cr(Ⅵ)的表面接触还原作用、表面结合作用和表面沉积作用等主要吸附机理,并对pH值、离子强度、活性炭表面积及孔径分布、表面官能团特性、腐植酸类物质对活性炭吸附水中Cr(Ⅵ)效能的影响进行探讨。
The environmental safeties of drinking water source area and drinking water supply have been threatened by heavy metal because of its potential biological toxicity and high pollution risk. Adsorption has been widely used in water treatment process for its advantages over other methods, such as high efficiency, minimization of chemical sludge, strong ability to low temperature, and possibility of metal recovery. In this paper, hexavalent chromium is chosen as typical pollutant and its chemical and toxicology properties are analyzed. Then it is expounded that the adsorption mechanism of hexavalent chromium on activated carbon （AC） is a comprehensive process, such as surface reduction, surface binding and surface deposition. The main influence factors on the adsorption property are also discussed in terms of pH value, ionic strength, surface area and pore size distribution of AC, characteristic of surface functional group and humic substances.
出处
《山东建筑大学学报》
2011年第4期396-402,共7页
Journal of Shandong Jianzhu University
基金
国家水体污染控制与治理科技重大专项(2009ZX07424-005)
国家"863"重大专项研究计划(2008AA06A414)
关键词
六价铬
活性炭
吸附机理
表面还原
表面结合作用
离子强度
hexavalent chromium
activated carbon
adsorption mechanism
surface reduction
surfacebinding
ionic strength
