中文关键词过氧化钙(CaO₂)磁性硅藻土磷酸盐吸附 英文关键词calcium peroxide(CaO₂)magnetic diatomitephosphateadsorption

作者	单位	E-mail
徐楚天	苏州科技大学环境与工程学院, 苏州 215009	xctdrj@163.com
李大鹏	苏州科技大学环境与工程学院, 苏州 215009	ustsldp@163.com
张帅	苏州科技大学环境与工程学院, 苏州 215009
耿雪	苏州科技大学环境与工程学院, 苏州 215009
陈丽媛	苏州科技大学环境与工程学院, 苏州 215009
宋小君	苏州科技大学环境与工程学院, 苏州 215009
郭超然	苏州科技大学环境与工程学院, 苏州 215009
黄勇	苏州科技大学环境与工程学院, 苏州 215009

中文摘要 本研究以磁性硅藻土为载体，负载纳米过氧化钙（CaO₂），制备了一种可高效吸附磷酸盐且可回收的复合材料（MDCP），并利用SEM、EDX-mapping、XRD、XDS和VSM等技术对MDCP的微观形貌、内部结构、晶体组成以及元素组成进行了表征.结果表明，MDCP表面成功负载了CaO₂，并具有良好的磁性.MDCP对水中磷酸盐的吸附数据符合Langmuir等温吸附模型，根据Langmuir模型确定当T=20℃时MDCP对水中磷酸盐的最大单位吸附容量为191.84 mg·g^-1.吸附等温线与吸附动力学的结果表明，MDCP对磷酸盐的吸附过程属于化学吸附.pH对MDCP吸附磷酸盐具有显著的影响，MDCP对磷酸盐的有效吸附pH范围为4~10，且MDCP对溶液pH具有调节效果，可使溶液pH保持在7~9的水平.当溶液共存Cl^-、SO₄^2-、CO₃^2-、HCO₃^2-、F^-和NO₃^-等阴离子时，MDCP对水中磷酸盐仍具有良好的选择吸附性.回收后的MDCP可用HCl溶液对其吸附的磷酸盐进行解吸，解吸后的MDCP再次负载CaO₂后对磷酸盐去除率仍可达到初次吸附量的70%. 英文摘要 In this study,magnetic diatomite was used as a carrier to load calcium peroxide(CaO₂) nanoparticles,fabricating a high efficiency phosphate adsorption and recovery composite material(MDCP).The micromorphology, inner structure,crystalline constituents and element composition of MDCP were characterized by SEM,EDX-mapping,XRD, XDS, and VSM,respectively.The adsorption isotherm data of MDCP exhibited good agreement with the Langmuir isotherm model. According to the Langmuir model,when T=20℃,the maximum monolayer phosphate adsorption capacities can reach 191.84mg·g^-1 for MDCP. The isotherm and kinetics studies showed that MDCP has a regulating effect on the pH of the solution,which can maintain the pH of the solution at the level where adsorption of phosphate occurs on MDCP as a chemisorption process. pH plays a important role on the adsorption of phosphate by MDCP,the pH of effective adsorption ranges from 4 to 10,and the pH of the adsorbed solution can still be maintained in the range of 7 to 9.The MDCP exhibited a high selective adsorption for phosphate in the presence of anions,including Cl^-, SO₄^2-, CO₃^2-, HCO₃^2-, F^-, and NO₃^-.The recovered MDCP could be desorbed by HCl solution,and after desorption, the phosphate removal rate of MDCP after re-loading CaO₂ could still reach 70% of the initial adsorption.

PDF全文下载地址:

https://www.hjkx.ac.cn/hjkx/ch/reader/create_pdf.aspx?file_no=20200231&flag=1&journal_id=hjkx&year_id=2020