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四环素对载锰沸石去除废水中Cd的作用效应

发表时间:2016-09-30  浏览量:1276  下载量:251
全部作者: 吴 鹍,刘艳鸽,付 军,张芙蓉,刘 婷
作者单位: 西安建筑科技大学环境与市政工程学院;西北农林科技大学资源环境学院;环境保护部环境发展中心科技处
摘 要: 采用浸渍–氧化法制备新型吸附剂——载锰沸石。用傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FTIR)对载锰沸石进行表征,初步探讨载锰沸石的吸附作用机理;采用火焰原子吸收分光光度法,从吸附动力学、吸附等温线、pH值等方面研究该吸附剂对Cd的吸附特性。结果表明,在Cd单一污染和四环素(tetracycline,TC)& Cd复合污染的条件下,吸附过程以化学吸附为主,由表面扩散和颗粒内扩散联合控制。Langmuir和Freundlich等温吸附模型均可以较好地拟合吸附等温线数据。在Cd单一污染条件下,Freundlich等温吸附模型拟合效果更好;在TC & Cd复合污染条件下,Langmuir等温吸附模型拟合效果更好。此外,在单一和复合污染条件下,当pH值为2.0~6.0时,Cd的吸附量均随着pH值的升高而增加。在pH值为2.0~3.0时,TC的存在对载锰沸石吸附Cd有抑制作用,而在pH值为 4.0~6.0时表现为促进作用。
关 键 词: 环境工程学;吸附;载锰沸石;镉;四环素
Title: Effect of teracycline on removal of Cd by Mn-oxide-coated zeolite in wastewater
Author: WU Kun, LIU Yange, FU Jun, ZHANG Furong, LIU Ting
Organization: School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology,College of Resources and Environment, Northwest A & F University, Yangling,Science and Technology Department, Environmental Development Center of the Ministry of Environmental Science and Technology
Abstract: In this paper, impregnation and oxidation method was used to modify zeolite by loading Mn oxides on its surface for a new sorbent, Mn-oxide-coated zeolite. Fourier transform infrared spectroscopy (FTIR) was used to characterize the new sorbent and explore its adsorption mechanism. Flame atomic absorption spectrophotometry was used to study the adsorption characteristics from adsorption kinetics, adsorption isotherms, pH values and so on. Both Cd pollutant systems and tetracycline (TC) & Cd conditions are controlled by more than one rate-limiting step. And both Langmuir model and Freundlich model fit for the isotherm data, the Freundlich model fits isotherm better in single Cd situation while the Langmuir model fits better in co-pollution [TC & Cd] situation. In addition, the adsorption of Cd increases at pH=2.0-6.0 both in the situation of the single [Cd] and co-pollution [TC & Cd]. Negative effect of TC was achieved at a pH range of 2.0-3.0 and positive effect at pH=4.0-6.0.
Key words: environmental engineering; adsorption; Mn-oxide-coated zeolite; cadmium; tetracycline
发表期数: 2016年9月第18期
引用格式: 吴 鹍,刘艳鸽,付 军,等. 四环素对载锰沸石去除废水中Cd的作用效应[J]. 中国科技论文在线精品论文,2016,9(18):1938-1946.
 
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