化工学报2019，Vol.70Issue(4)：1600-1613,14.DOI:10.11949/j.issn.0438⁃1157.20181453
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
摘要
Abstract
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%. Ca2+, Mg2+, 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/NiFe2O4@CKey words
adsorption/thallium/desorption/hydrothermal carbon/regeneration/NiFe2O4@C分类
化学化工引用本文复制引用
林茂,李伙生,张高生,张平,龙建友,肖唐付,张鸿郭,熊静芳,陈永亨..铁酸镍基水热炭协同次氯酸根氧化去除废水中铊[J].化工学报,2019,70(4):1600-1613,14.基金项目
国家自然科学基金项目(51606036) （51606036）
黑龙江省自然科学基金青年项目(QC2014C047) （QC2014C047）
黑龙江省教育厅项目(UNPYSCT-2016085) （UNPYSCT-2016085）
