摘要
本研究制备合成一种新型可高效除磷的镧负载复合吸附剂材料(La⁃MZ/CTS),考察了材料的表面特性以及投加量、初始溶液pH、共存阴离子等因素对除磷效果的影响.SEM、BET和EDS分析说明负载镧后,材料表面均匀覆盖了La(OH)3并且表现出较大的孔径和比表面积,分别为16.681 nm、32.342 m^(2)·g^(-1).材料对磷酸根的最大吸附量可以达到27.9 mg·g^(-1),与负载前的材料相比提高了近10倍.在pH为6时,La⁃MZ/CTS的吸附性能最佳.溶液中共存F-和CO23-会抑制该材料除磷效果,材料对于磷的吸附容量分别下降8.9%和16.3%.该材料吸附动力学过程符合准二级动力学模型,吸附等温线拟合结果表明Freundlich拟合方程能较好地描述其对磷酸盐的吸附过程,表明材料的吸附过程为多分子层化学吸附.此外,镧在整个吸附反应过程中的溶出量低于ICP检测限,进一步表明La⁃MZ/CTS是一种稳定性较好的高效除磷吸附剂.
A lanthanum⁃loaded zeolite⁃chitosan composite(La⁃MZ/CTS)was fabricated successfully in this study.The characterization of this material and the effects of different dosage,initial solution pH and coexisting anions on phosphorus removal were studied.The results of SEM、BET and EDS indicated that the La(OH)3 was covered evenly on the surface of composite and the lanthanum⁃loaded material exhibited larger pore diameter and specific surface area,which were 16.681 nm and 32.342 m^(2)·g^(-1),respectively.The maximal phosphate adsorption capacity of La⁃MZ/CTS was 27.9 mg·g^(-1),increased nearly 10 times than the un-loaded material.The best result of phosphorus removal was obtained in solution of pH 6,while effectively inhibition was observed when F-or CO23-exist in the solution,the adsorption capacity decreased by 8.9% and 16.3% respectively.The adsorption process can be well fitted by pseudo⁃second order model and the adsorption isotherm is better described by the Freundlich equation.above analysis indicates that phosphate adsorption by La⁃MZ/CTS is a multiple-molecule chemical adsorption.In addition,the leaching amount of lanthanum during adsorption was lower than the detection limit of ICP.Our results demonstrate the La⁃MZ/CTS is a highly effective absorbent for phosphorus removal with superb stability.
作者
张亦南
丁佳锋
张小芳
吕昕煜
朱律寒
张杭君
ZHANG Yinan;DING Jiafeng;ZHANG Xiaofang;LÜ Xinyu;ZHU Lühan;ZHANG Hangjun(College of Life and Environmental Sciences,Hangzhou Normal University,Hangzhou 310036)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第2期557-565,共9页
Acta Scientiae Circumstantiae
基金
杭州市科学技术委员会农业和社会发展科研主动设计项目(No.20180417A05)
浙江省大学生科技创新活动计划(新苗人才计划)(No.2019R426028)。
