正方薄片状BiOBr的水热合成及其可见光催化降解CCl_4  

Hydrothermal Synthesis of Tetragonal Sliced BiO Br Crystals and Its Visible Light Catalytic Degradation for CCl_4 in Solution

作　　者：高霞[1,2] 张军[1] 李承轩[1] 白孝康 李晶晶[1] 

机构地区：[1]河南科技大学化工与制药学院,河南洛阳471023 [2]河南教育学院化学与环境学院,河南郑州450046

出　　处：《河南科技大学学报（自然科学版）》2015年第3期100-104,10,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(21076063);河南省科技攻关基金项目(102102210170);洛阳市科技攻关基金项目(1101030A);洛阳市矿产资源化工重点实验室建设项目(1003016A)

摘　　要：以可溶性铋盐和溴化钠为原料,通过一步法水热处理,合成了外形规则的溴氧化铋(Bi OBr)微米薄片。借助X射线粉末衍射和扫描电子显微镜分别对产物进行了物相和形貌表征;采用正交设计优化原理,试验考查了p H值、可见光功率、Bi OBr投加量和反应时间4个主要因素,对水溶液中四氯化碳(CCl4)催化降解的综合作用结果;同时,依据所得最优化工艺条件,进一步研究了单一因素p H值及可见光功率的变化对CCl4降解效果的影响。研究结果表明:合成得到的Bi OBr属于结晶度良好的正方薄片状高纯晶体;Bi OBr可见光催化降解CCl4的影响因素从主到次的顺序依次为:降解时间>p H值>可见光功率>Bi OBr投加量;最优条件下CCl4的最大降解率可达91.72%。p H<7的酸性环境有助于CCl4的催化降解;可见光功率的增大可促进CCl4降解率的提升,但以中等强度(550 W)的可见光功率更为可取。The sliced BiO Br microcrystals with regular morphology were synthesized via one-step hydrothermal treatment by using soluble bismuth salt and sodium bromide as reactants. The shapes and phase composition of the resulting products were characterized with scanning electron microscope and X-ray powder diffraction,respectively. The effects of p H value,visible light power,BiO Br dosage and reaction time on the catalytic degradation of CCl4 in solution were investigated via visible light irradiation by means of orthogonal optimizing design. Meanwhile,according to the optimum conditions the effects of visible light power and p H value on the CCl4 degradation were analyzed. The results show that the as-prepared BiO Br microcrystals belong to sliced tetragonal crystallographic system with well crystallinity and high purity. The effecting factors for CCl4 catalytic degradation follow such an order as reaction time > p H value > visible light power > BiO Br dosage. Under the optimum conditions the maximum degradation rate of CCl4 can reach 91. 72%. Acid solution environment( p H < 7) helps to degrade. The rise of the visible light power improves degradation rate,and the selection of550 W is more preferable.

关 键 词：溴氧化铋 水热合成 可见光催化 四氯化碳 降解率 

分 类 号：O644.3[理学—物理化学]