摘要
为了更方便高效和绿色环保处理水中的微囊藻毒素(MC-LR),采用溶胶-凝胶法制备了硫(S)掺杂的二氧化钛(TiO2)纳米光催化剂粉体(S-TiO2),利用X射线光电子能谱(XPS)、X射线衍射(XRD)以及紫外可见光的反射光谱,分析测定了催化剂的结构特征,并以浓度为0.1μg/mL的MC-LR的光降解效果考察了其光催化活性,研究其光降解条件。结果表明,本实验制备的催化剂为锐钛矿结构,S以S+6的形式进入TiO2晶格。催化剂的最优制作工艺为:掺杂量([S]/[Ti])0.25,500℃下煅烧3h,且制备的S-TiO2具有较好的稳定性和回收性,重复利用5次,降解率仅下降3.98%;最优MC-LR可见光降解工艺为:光强3 000lx,催化剂投加量0.1g/L,反应时间16h。在此催化剂制备条件以及可见光降解反应条件下,MC-LR的降解率为100%,残留量低于WHO规定的藻毒素含量限值。
In order to remove microcystin(MC-LR)more easily,efficiently and eco-friendly,the sol-gel method was used to synthesize a sulfur doped TiO_2 photocatalyst(S-TiO_2).The catalyst was characterized using UV-VIS diffuse reflectance spectroscopy(DRS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).Photocatalytic degradation of the cyanotoxin microcystin-LR(MC-LR,0.1μg/mL)under visible was investigated to identify optimal conditions for S-TiO_2 synthesis and for MC-LR degradation.Results show that the TiO_2 crystal phase is anatase and the sulfur is fully oxidized,S(VI).The optimal conditions for S-TiO_2 synthesis is a mole ratio(S∶Ti)of 0.25 and calcining the product at 500℃ for 3 h.The S-TiO_2 photocatalyst was stable and the degradation rate decreased only 3.98%after five cycles of recovery and reuse.At a catalyst dose of 0.1 g/L and a reaction time of 16 hat 3000 lux,the MC-LR(0.1μg/mL)was completely removed(100% degraded)and the treated water complied with algal toxin limits set by the WHO and China,which is proved to be the most effective MC-LR degradation craft.
作者
彭晓叶
汤嘉雯
杨钧岩
孙巍峰
王旭娜
江敏
PENG Xiao-ye;TANG Jia-wen;YANG Jun-yan;SUN Wei-feng;WANG Xu-na;JIANG Min(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,P.R.China;Shanghai Engineering Research Center of Aquaculture,Shanghai 201306,P.R.China;Research and Engineering Center on Aquatic Environment Ecosystem,Shanghai 201306,P.R.China)
出处
《水生态学杂志》
CSCD
北大核心
2018年第5期95-103,共9页
Journal of Hydroecology
基金
上海市虾类产业技术体系建设项目(沪农科产字(2014)第5号
上海市教委重点学科建设项目(No.J50701)
上海市高校知识服务平台项目(No.ZF1206)
关键词
硫
二氧化钛
光催化
微囊藻毒素
sulfur
titanium dioxide
photocatalysis
microcystin-LR