摘要
为了降低农业磷肥成本以及防止水环境富营养化,需要对水中磷进行处理.以碱渣为主要原料,用氢氧化钠和十二烷基硫酸钠通过煮沸、振荡等方式制备一种改性吸附材料,并将其用于模拟废水中磷的去除.通过批量吸附实验考察吸附剂用量、溶液pH、污染物初始质量浓度及吸附时间等参数对磷去除的影响.通过等温吸附模型、动力学模型以及热力学模型研究其吸附行为,并利用XRF、XRD、SEM-EDS、FTIR及BET探索吸附机理.结果表明,在磷质量浓度20 mg/L、复合改性碱渣用量0.55 g/L、pH 6、吸附时间30 min、温度25℃的条件下,溶液中磷的最大去除率为98.05%,吸附容量为44.12 mg/g;该吸附剂对磷的吸附符合Langmiur等温吸附模型,表明吸附材料对磷的吸附过程主要为单分子层的化学吸附.
Abstract
In order to reduce the cost of agricultural phosphate fertilizer and prevent eutrophication of wa-ter environment,it is necessary to treat phosphorus in water.A modified adsorption material was prepared by boiling and oscillating with sodium hydroxide and sodium dodecyl sulfate from alkali residue,and was used to remove phosphorus from simulated wastewater.The effects of adsorbent dosage,solution pH,initial concen-tration of pollutants and adsorption time on phosphorus removal were investigated by batch adsorption experi-ments.The adsorption behavior was studied by isothermal adsorption model,kinetic model and thermodynam-ic model,and the adsorption mechanism was explored by XRF,XRD,SEM-EDS,FTIR and BET.The results showed that under the conditions of mass concentration of phosphorus 20 mg/L,dosage of composite modi-fied alkali residue 0.55 g/L,pH 6,adsorption time 30 min and temperature 25℃,the maximum phosphorus re-moval rate was 98.05%and adsorption capacity was 44.12 mg/g.The adsorption of phosphorus by the adsor-bent conforms to the Langmiur isothermal adsorption model,indicating that the adsorption process of phos-phorus by the adsorbent was mainly chemical adsorption of monolayer.
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