文献类型：期刊文献

中文题名：海藻酸钠-氢氧化镧改性Y型分子筛颗粒除氟研究

英文题名：Study on fluoride removal by modified Y zeolite particles with sodium alginate-lanthanum hydroxide

作者：卞晓彤[1];邱兆富[1];杨骥[1];严瑞琪[1];吕树光[1]

机构：[1]华东理工大学资源与环境工程学院,国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

年份：2020

卷号：52

期号：12

起止页码：86

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：中央高校基本科研业务费专项资金资助(222201817009);国家环境保护公益性行业科研专项(201309021)。

语种：中文

中文关键词：海藻酸钠;颗粒吸附剂;除氟;氢氧化镧;Y型分子筛

外文关键词：sodium alginate;particle adsorbent;defluorination;lanthanum hydroxide;Y zeolite

摘要：为解决除氟吸附剂分离困难、有效成分流失等问题,以海藻酸钠(SA)与氢氧化镧改性Y型分子筛(LHMS)为原料,采用滴球法制备了SA@LHMS颗粒吸附剂,并采用模拟废水对其进行了除氟研究。通过正交实验确定了吸附剂最佳制备条件,并通过间歇吸附实验测试了吸附剂投加量、pH、共存离子等因素对吸附的影响,探究了吸附速率、吸附等温线等吸附性能。结果表明,SA@LHMS吸附速率曲线符合拟二级反应速率方程;吸附等温线符合Ⅱ型等温线,为多分子层吸附;初始pH(3~12)对吸附效果没有显著影响;高浓度共存阴离子(50 mg/L)对吸附过程有一定抑制;1 mol/L和2 mol/L氢氧化钠溶液对SA@LHMS再生效果较好,经3次再生仍然保留较高的吸附能力。SA@LHMS颗粒表面和截面形态以及吸附前后颗粒的表面形态差异明显;吸附前后颗粒表面能谱(EDS)分析以及红外光谱(FT-IR)分析结果显示,吸附过程中溶液中的氟离子(F-)与颗粒表面及内部的羟基(—OH)发生配体交换。
In order to solve the problem of the separation of defluorinated adsorbents and the loss of effective components,SA@LHMS adsorbents were prepared with sodium alginate(SA)and lanthanum hydroxide modified Y zeolite(LHMS)as raw materials.The optimum preparation conditions of adsorbent were determined by orthogonal experiment.The effect of factors,such as dosage of adsorbent,pH and co-existing ions etc.,was tested by batch adsorption experiment,and the adsorption performance of adsorption rate and adsorption isotherm was researched.The results showed that the adsorption rate curve of the SA@LHMS conformed to the second-order reaction rate equation.Adsorption isotherm conformed to the typeⅡisotherm,multilayer physical adsorption.The initial pH(3~12)had no significant effect on the adsorption effect.High concentration of co-existing anions(50 mg/L)inhibited the adsorption process.The regeneration effect of 1 mol/L and 2 mol/L NaOH solution on SA@LHMS was better,and SA@LHMS still retained a high adsorption capacity after three regeneration.The surface and cross section morphology of SA@LHMS as well as the surface morphology before and after adsorption were significantly different.EDS component analysis and FT-IR spectrum analysis before and after adsorption showed that ligand exchange occurcurred between F-and—OH on the surface and inside of particles during adsorption.