摘要
以给水污泥与稻壳为主要原料,添加适量聚乙烯醇、磷酸和海泡石,通过真空热解方式制备一种可悬浮的颗粒状吸附材料,并将其用于去除模拟印染废水中的亚甲基蓝(MB)。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以及吸附时间等参数对吸附效果的影响,通过等温吸附模型和动力学模型研究其吸附行为,并利用BET、XRD、SEM-EDS以及FTIR探索吸附机理。结果表明,在MB初始质量浓度为61 mg/L、颗粒吸附材料用量为8 g/L、pH为8、吸附时间为90 min、吸附温度为25℃的条件下,溶液中的MB达到最大去除率81.66%。等温吸附曲线和吸附动力学结果表明,该吸附过程与Langmuir等温吸附模型、准二级动力学模型的拟合度较好,表明吸附材料对MB的吸附过程主要为单分子层的化学吸附,理论最大吸附量为66.67 mg/g。微观分析表明,吸附材料主要是通过中孔及纤维吸附、羟基取代和π-π相互作用吸附废水中的MB。
A suspended granular adsorbent was prepared by vacuum pyrolysis with supply water sludge and rice husk powder,together with a small amount of polyvinyl alcohol,phosphoric acid and sepiolite,and used to remove methylene blue(MB)from simulated printing and dyeing wastewater.Effects of adsorbent dosage,solution pH,initial mass concentration of MB and contact time on the adsorption of MB were investigated by batch adsorption experiments.The adsorption behavior of the adsorbent for MB were studied through the isothermal adsorption model and adsorption kinetic model.The adsorption mechanism was explored by BET,XRD,SEM-EDS and FTIR.The results showed that the maximum removal rate of MB was 81.66% under the conditions of MB initial mass concentration was 61 mg/L,dosage of granular adsorbent was 8 g/L,pH was 8,adsorption time was 90 min and adsorption temperature was 25℃.Langmuir isotherm model and pseudo-second-order kinetic model fitted well for the adsorption process,demonstrating the adsorption process could be described by monolayer chemical adsorption.The theoretical maximum adsorption capacity of the absorbent for MB was 66.67 mg/g.The characterization analysis showed that the adsorption of MB was achieved by the mesoporous structure and carbon fiber adsorption,hydroxyl substituents and interaction of π-π valence with adsorbent.
作者
陈永亮
王玲
石磊
李慧敏
王学东
CHEN Yongliang;WANG Ling;SHI Lei;LI Huimin;WANG Xuedong(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;National Key Laboratory of Environmental Protection,Mineral and Metallurgical Resources Utilization and Pollution Control,Wuhan 430081,China;College of Resource Environment and Tourism,Beijing 100048,China)
出处
《印染助剂》
CAS
2023年第4期33-41,共9页
Textile Auxiliaries
基金
国家环境保护矿冶资源利用与污染控制重点实验室开放基金(HB201913)
国家自然科学基金项目(41102218)。
关键词
给水污泥
稻壳
亚甲基蓝
吸附
印染废水
supply water sludge
rice husk
methylene blue
adsorption
printing and dyeing wastewater
