摘要
针对采矿、冶金、石油炼制等行业产生的含钒废水导致的环境污染难题,以热解后的贻贝壳粉(CMS)为载体,通过液相还原法制备了贻贝壳负载纳米零价铁复合材料(nZVI@CMS),采用SEM、TEM、XRD、BET、FT-IR和XPS等对其进行了表征,通过批量吸附实验考察了nZVI@CMS对V(Ⅴ)的吸附性能,利用吸附动力学、吸附等温线和吸附热力学分析了nZVI@CMS对V(Ⅴ)的吸附机制。结果表明:nZVI@CMS具有疏松多孔的链球状结构,含有多种含氧官能团;在nZVI@CMS投加量0.05 g/L、初始pH=7、V(Ⅴ)初始质量浓度20 mg/L、溶液体积100 mL、温度25℃的条件下,nZVI@CMS在600 min内对V(Ⅴ)的最大吸附量为149.33 mg/g。nZVI@CMS对V(Ⅴ)的吸附过程可通过Langmuir吸附等温模型与准二级反应动力学方程拟合,且该过程是自发的吸热过程。nZVI@CMS对V(Ⅴ)的去除机制主要包括吸附、还原和共沉淀作用。本研究将贻贝壳变废为宝,同时为废水中V(Ⅴ)的高效治理提供了新思路。
Aiming at the environmental pollution problems caused by vanadium-containing wastewater produced by mining,metallurgy,petroleum refining,and other industries,this study prepared mussel shells loaded nano-zero-valent iron composites(nZVI@CMS)by liquid-phase reduction method using pyrolyzed mussel shell powder(CMS)as the carrier.The morphology and structure of nZVI@CMS were characterized by SEM,TEM,XRD,BET,FT-IR and XPS.The adsorption performance of V(Ⅴ)on nZVI@CMS was investigated by batch adsorption experiments,and the adsorption mechanism of V(Ⅴ)on nZVI@CMS was analyzed using adsorption kinetics,adsorption isotherm,and adsorption thermodynamics.The results showed that nZVI@CMS was a loose and porous chain sphere-like structure containing a variety of oxygen-containing functional groups.The maximum adsorption of V(Ⅴ)by nZVI@CMS was 149.33 mg/g under the conditions of nZVI@CMS dosage of 0.05 g/L,initial pH=7,V(Ⅴ)concentration of 20 mg/L,solution volume of 100 mL,and temperature of 25℃.The adsorption of V(Ⅴ)by nZVI@CMS could be fitted by Langmuir adsorption isotherm equation and pseudo second-order reaction kinetic equation,and it was a spontaneous heat adsorption process.The main mechanisms of V(Ⅴ)removal by nZVI@CMS included adsorption,reduction,and co-precipitation.This study turned the mussel shells into treasure,and provided a new idea for the efficient treatment of V(Ⅴ)in wastewater.
作者
李然
纪丽丽
何前锐
夏晓月
王亚宁
LI Ran;JI Lili;HE Qianrui;XIA Xiaoyue;WANG Yaning(National Engineering and Technology Research Center for Marine Facility Aquaculture,Zhejiang Ocean University,Zhoushan 316022,China;College of Food and Pharmacy,Zhejiang Ocean University,Zhoushan 316022,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2024年第9期127-135,共9页
Industrial Water Treatment
基金
浙江省教育厅一般科研项目(Y202044721)。
关键词
贻贝壳
液相合成
纳米零价铁
钒
还原
mussel shell
liquid-phase synthesis
nano zero-valent iron
vanadium
reduction
