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作 者:莫蔚明[1] 张敏骏[2,3] 康彩艳[2,3] 伦宇龙[2,3] 蒙冕武[2,3] 陈孟林[2,3]
机构地区:[1]广西师范大学化学与药学学院 [2]广西师范大学环境与资源学院 [3]广西环境污染控制理论与技术重点实验室,广西桂林541004
出 处:《环境科学与技术》2014年第4期15-19,共5页Environmental Science & Technology
基 金:国家自然科学基金项目资助(21267005);广西自然科学基金项目资助(2010GXNSFA013008);广西教育厅立项项目(200807LX023);桂林市科技开发项目(20130117-1)
摘 要:研究以环氧氯丙烷、乙二胺、三乙胺对木薯秸秆化学改性制备的吸附剂对磷酸根的去除效果,考察了吸附剂投加量、溶液初始pH值、浓度、接触时间等对磷酸根吸附效果的影响。结果表明,改性木薯秸秆可以有效吸附磷酸根。改性木薯秸秆的投加量为4g/L时,对磷酸根的去除率达到95%;吸附效果受溶液初始pH影响较大,去除率随pH的增大而不断增大,当pH为3.0-8.0范围时,改性木薯秸秆对磷酸根的吸附效果较好,去除率均为95%左右;改性木薯秸秆对磷酸根的吸附均符合Langmuir等温吸附方程和Freundlich等温吸附方程,最大吸附鼍为2.58mmol/g;改性木薯秸秆对磷酸根的吸附为快速吸附,30min即可达到吸附平衡。二级动力学方程可以很好地反映该吸附过程,且平衡吸附量Qe的实验值与拟合值非常接近。颗粒内扩散是控制吸附速度的因素之一。Cassava stalk was modified into an anion exchanger using epichlorohydrin, ethylenediamine and triethylamine, and adsorption ability of the anion exchanger for phosphate was examined through batch experiments. The influence factors on the adsorption, including adsorbent dosage, pH, initial concentration of phosphate and contact time, were tested. Results showed that adsorption ability of modified cassava stalk for phosphate increased, and the best phosphate removal rate of 95% was obtained at 4 g/L of adsorbent dosage and pH range of 3.0±8.0. The adsorption data fitted the Langmuir and Freundlich adsorption isotherm, and the maximum adsorption capacity was 2,58 mmol/g. The adsorption of phosphate onto the adsorbent was a fast adsorption process, reaching balance at 30 min. The second order reaction equation can well reflect the adsorption process, with the equilibrium adsorption amount of Q, quite close to the experimental values. The adsorption rate was controlled by inter-particle diffusion, but it was not the only controlling factor.
关 键 词:改性木薯秸秆 吸附效果 磷酸根 吸附动力学 吸附等温线
分 类 号:X132[环境科学与工程—环境科学]
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