新型多金属氧酸盐K_7BiW_(11)O_(39)Sn·11H_2O制备及光催化降解模拟染料废水  

Synthesis of novel polyoxomatalate K_7BiW_(11)O_(39)Sn·11H_2O and Photocatalytic degradation of simulated dye wastewater

作　　者：余悦[1] 朱秀华[1] 王炜[1] 王鹏远[2] 盛峰[1] 张蓉[3] 

机构地区：[1]大连交通大学环境与化学工程学院,大连116028 [2]吉林大学化学学院,长春130012 [3]大连理工大学精细化工国家重点实验室,大连116012

出　　处：《环境化学》2016年第5期998-1006,共9页Environmental Chemistry

基　　金：辽宁省高等学校优秀人才支持计划项目(LR2013019);辽宁省高等学校环境科学与技术重点实验室基金(LS2010031);大连理工大学精细化工国家重点实验室开放课题基金(KF0707)资助~~

摘　　要：本文采用水热合成法首次制备了一种新型多金属氧酸盐,采用扫描电镜(SEM)、扫描电镜-能谱(SEM-EDS)、X射线光电子能谱(XPS)、X射线衍射(XRD)、热重-差热分析(TG-DSC)、紫外可见吸收光谱(UV-Vis)、傅里叶变换红外光谱(FTIR),电感耦合等离子体发射光谱(ICP)等技术对其进行了表征,结果表明,所制备的化合物具有Keggin结构,为非晶体化合物,其分子式为K_7BiW_(11)O_(39)Sn·11H_2O(BiW_(11)Sn).以酸性红299(AR299)为目标降解污染物,研究了自然日光辐照下BiW_(11)Sn均相光催化AR299水溶液脱色降解活性.结果表明,BiW_(11)Sn能有效的光催化AR299脱色降解.AR299溶液的初使pH值、初始浓度、催化剂投加量、光解时间对AR299光催化降解效果均有影响.20 mL,4 mg·L^(-1),初始pH值为5.4的AR299水溶液(溶液中BiW_(11)Sn浓度为0.5 g·L^(-1)),阳光下辐照3 h,其脱色率达到93.1%;其光催化降解反应遵循LangmuirHinshelwood准一级动力学方程;超氧负离子自由基为光催化降解过程中的重要活性物种.A new polyoxometallate photocatalyst was synthesized by hydrothermal coprecipitation in this paper. It was characterized by SEM,SEM-EDS,XPS,XRD,TG-DSC,UV-Vis,FTIR,and ICP.The results indicated that the synthesized compound exhibited a Keggin structure and non-crystalline.The molecular formula of the compound is K_7BiW^（11）O_（39）Sn·^（11）H_2O（ BiW^（11）Sn）. Acid red 299（ AR299） was selected as the target degradation pollutant. The photocatalytic activities of BiW^（11）Sn were evaluated by its photocatalytic degradation of AR299 with natural sunlight irradiation in aqueoussolution. Results indicated that BiW^（11） Sn effectively and photocatalytically decolorized AR299. The photocatalytic degradation of AR299 was influenced by the dosage of the catalyst,the photolysis time,the initial p H and the initial concentration of AR299. AR299 solution（ 20 mL,4 mg·L^（-1）,initial p H 5. 4） with BiW^（11）Sn（ 0. 5 g·L^（-1）） was irradiated for 3 h under sunlight,and the decoloration rate was 93.1%. BiW^（11）Sn-mediated photocatalytic degradation of AR299 was a pseudofirst-order reaction and modeled by Langmuir-Hinshelwood-type kinetics. Superoxide anion radical（ ·O_2^-） was the important active species in the photocatalytic reaction.

关 键 词：光催化 多金属氧酸盐 降解 染料废水 

分 类 号：O643.36[理学—物理化学] X788[理学—化学]