几种基质对水中磷吸附特性.pdfVIP

中国环境科学 2011,31(7) ：1186~1191 China Environmental Science 几种基质对水中磷的吸附特性 1,2,3 1,2 1* 朱文涛 ,司马小峰 ,方 涛 (1. 中国科学院水生生物研究所,湖北 武汉 430072 ；2. 中国科学院研究生院, 北京 100049 ；3. 山西省生态环境研究中心, 山西 太原 030002) 摘要：选取钢渣、活性炭、天然沸石、粗砂4 种基质,结合矿物成分分析研究其对磷的等温吸附特征和吸附动力学过程,并考察pH 值对其 吸附磷的影响.结果表明:活性炭、天然沸石、粗砂的等温吸附特征与Freundlich 方程拟合较好(r0.9);而钢渣更符合Langmuir 方程.其吸附 能力大小为:钢渣活性炭沸石粗砂.沸石、粗砂对磷酸盐的吸附以物理吸附为主,钢渣以化学吸附为主,而活性炭在前期以物理吸附为主, 后期则以化学吸附为主.Elovich 方程和双常数速率方程能较好的反映4 种基质对磷的吸附动力学特征.pH 值的变化对钢渣的吸附性影响不 大,沸石在酸性及弱碱性条件下对磷的吸附性相当,活性炭在pH3~13 吸附量维持在190mg/kg 左右,粗砂在pH3 时吸附量达最大,综合而言, 在土地处理系统的实际应用中,选取钢渣可获取最佳的除磷效果. 关键词：基质；磷；等温吸附；动力学；pH 值 中图分类号：X52 文献标识码：A 文章编号：1000-6923(2011)07-1186-06 The character of phosphorous adsorption in water on different substrates. ZHU Wen-tao1,2, SIMA Xiao-feng1,2, 1* FANG Tao (1.Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China；2.Graduate University of the Chinese Academy of Sciences, Beijing 100049, China ；3.Research Center for Eco-Environmental Sciences, Shanxi Province, Taiyuan 030002, China), China Environmental Science, 2011,31(7)：1186~1191 Abstract ：Phosphorus adsorption isotherms and adsorption kinetics of steel slag, activated carbon, natural zeolite and coarse sand were studied, and the effect of pH value on phosphorus adsorption was evaluated. The results showed that, the adsorption isotherms of activated carbon, natural zeolite and sand qualified Freundlich equation (r0.9), and steel slag fitted Langmuir equation. The adsorptive capacity was ranged as steel slagactivated carbonzeolite coarse sand. The adsorption mechanisms of zeolite and coarse sand were physical adsorption, and that of slag was chemical adsorption. Phosphorus adsorption by activated carbon was physical adsorption firstly, and then chemical adsorption