镧、钕改性沸石吸附水中磷的研究  

Adsorption of Phosphorus in Water by Lanthanum and Neodymium Modified Zeolite

作　　者：徐佳丽 陈云嫩[1] 李雨婷 Xu Jiali;Chen Yunnen;Li Yuting(College of Resources and Environmental Engineering,Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control,Jiangxi University of Sci-ence and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学资源与环境工程学院,江西理工大学江西省矿冶环境污染控制重点实验室,江西赣州341000

出　　处：《中国稀土学报》2023年第5期921-929,I0003,共10页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51864021)资助。

摘　　要：为了去除水中的磷,采用La(NO_(3))_(3)和Nd(NO_(3))_(3)分别对天然沸石进行改性。实验探究了磷酸盐溶液的p H和初始浓度、沸石投加量、反应时间、反应温度等物理化学因素对去除水中磷酸盐的影响,并进行了FTIR,SEM,EDS和BET表征分析。实验结果表明:1.2 g·L^(-1)的La(NO_(3))_(3)改性沸石(La Z)和Nd(NO3)3改性沸石(Nd Z)对p H=4,5 mg·L^(-1)的磷酸盐溶液的去除效果最好,去除率分别可达97.61%和98.76%,而且该吸附过程符合Langmuir模型,且为化学吸附,即La(OH)_(3)和Nd(OH)_(3)与磷酸盐之间进行静电吸附,生成磷酸镧和磷酸钕络合物。In order to remove phosphorus from water,natural zeolite was modified by lanthanum nitrate and neo⁃dymium nitrate,respectively.The effects of physical and chemical factors such as pH and initial concentration of phosphate solution,dosage of zeolite,reaction time and reaction temperature on the removal of phosphate from water were investigated,and FTIR,SEM,EDS and BET characterization were performed.The experimen⁃tal results show that 1.2 g·L^(-1) lanthanum nitrate modified zeolite(LaZ)and neodymium nitrate modified zeolite(NdZ)have the best removal effect on phosphate solution with pH=4 and 5 mg·L^(-1),with removal rates up to 97.61% and 98.76%,respectively.Moreover,the adsorption process conforms to the Langmuir model and is che⁃misorbed.Lanthanum hydroxide and neodymium hydroxide are electrostatic adsorbed with phosphate to produce complexes of lanthanum phosphate and neodymium phosphate.

关 键 词：磷酸盐 沸石 硝酸镧 硝酸钕 吸附机制 

分 类 号：X703.1[环境科学与工程—环境工程]