铁酸镍基水热炭协同次氯酸根氧化去除废水中铊  

Removal of Tl from wastewater by nickel ferrite-based hydrothermal carbon coupled with hypochlorite oxidation

作　　者：林茂 李伙生[2] 张高生 张平[1] 龙建友[3] 肖唐付 张鸿郭[3,4] 熊静芳[3] 陈永亨[1,2] LIN Mao;LI Huosheng;ZHANG Gaosheng;ZHANG Ping;LONG Jianyou;XIAO Tangfu;ZHANG Hongguo;XIONG Jingfang;CHEN Yongheng(College of Chemistry and Chemical Engineering,Guangzhou University,Key Laboratory of Water Quality Safety and Protection of the Pearl River Delta,Ministry of Education,Guangzhou 510006,Guangdong,China;Environmental Research Institute of Dawan District,Guangzhou University,Guangzhou 510006,Guangdong,China;College of Environmental Science and Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China;Guangzhou University-Link?ping University Urban Sustainable Development Research Center,Guangzhou 510006,Guangdong,China)

机构地区：[1]广州大学化学化工学院珠江三角洲水质安全与保护教育部重点实验室，广东 广州 510006 [2]广州大学大湾区环境研究院，广东 广州 510006 [3]广州大学环境科学与工程学院，广东 广州 510006 [4]广州大学-林雪平大学城市可持续发展研究中心，广东 广州 510006

出　　处：《化工学报》2019年第4期1591-1604,共14页CIESC Journal

基　　金：国家自然科学基金项目(41573119;51808144)

摘　　要：以铁酸镍和葡萄糖为原料构建炭包裹的磁性水热炭(NiFe_2O_4@C)作为可重复利用的高效吸附剂,并催化次氯酸根协同氧化以去除废水中的铊。考察了初始pH、混凝pH、反应温度、共存物和氧化剂投加量等因素对除铊的影响,结合X射线粉末衍射仪(XRD)、X射线光电子能谱(XPS)和电子自旋共振光谱仪(ESR)等表征手段探究了其除铊机理。在铊初始浓度20 mg/L、初始pH 10、吸附剂投加量0.5 g/L、次氯酸钠投量10 mmol/L时,铊去除率达到99%以上。Ca^(2+)、Mg^(2+)、EDTA、DPTA抑制除铊。吸附过程更适合拟一级动力学模型,等温吸附更适用于Langmuir和Temkin方程描述,最大铊吸附量达989 mg/g。NiFe_2O_4@C对Tl(I)的去除机理主要为氧化沉淀和表面羟基络合。材料再生实验表明NiFe2O4@C有很好的脱附与再生能力。本研究为废水除铊提供了一定的理论和技术参考依据。In this study,carbon-coated magnetic hydrothermal carbon(NiFe2O4@C)was constructed from nickel ferrite and glucose as a reusable high-efficiency adsorbent,and the hypochlorite was catalyzed by oxidation to remove strontium from wastewater.The effects of initial pH,coagulation pH,reaction temperature,co-existing substance and hypochlorite dosage on thallium removal were examined,and mechanism on thallium removal was investigated by X-ray powder diffractometry(XRD),X-ray photoelectron spectroscopy(XPS)and electron spin resonance spectroscopy(ESR).When the initial concentration of thallium was 20 mg/L,the initial pH was 10,the adsorbent dosage was 0.5 g/L,and the sodium hypochlorite dosage was 10 mmol/L,the thallium removal efficiency reached more than 99%.Ca^2+,Mg^2+,EDTA,and DPTA can inhibit thallium removal.The adsorption process is more suitable for the pseudo-first order kinetic model,and isothermal adsorption is more suitable for the description of Langmuir and Temkin equation.The saturated adsorption capacity is high up to 989 mg/g.The removal mechanism of Tl(I)by NiFe2O4@C was mainly surface hydroxyl complexation and oxidation precipitation.Material regeneration experiments show that NiFe2O4@C has a good ability of desorption and regeneration.This study provides a theoretical and technical reference for thallium removal in wastewater.

关 键 词：吸附 铊 脱附 水热炭 再生 NiFe_(2)O_(4)@C 

分 类 号：TQ085[化学工程]