溶胶凝胶辅助水热可控合成ZnO不同形貌分级结构光催化剂  

Controllable Synthesis of Hierarchical Structure ZnO Photocatalysts with Different Morphologies via Sol-Gel Assisted Hydrothermal Method

作　　者：武广利[1] 赵晓华[1] 李萌[1] 李珍珍[1] 李彩珠[1] 娄向东[1] 

机构地区：[1]河南师范大学化学与化工学院,新乡453007

出　　处：《无机化学学报》2015年第1期61-68,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21073055)资助项目

摘　　要：以Zn(NO3)2·6H2O、柠檬酸和Na OH为原料,采用溶胶凝胶(sol-gel)辅助水热法,仅通过改变水热时间,就可得到片花、棒花及梭状3种不同形貌ZnO分级结构。利用XRD、SEM、UV-Vis DRS、光致发光光谱(PL)和氮低温吸附-脱附等手段对合成的ZnO样品进行了表征。推测了合成条件下不同形貌ZnO分级结构形成的机理。以活性翠兰(KGL)为模拟印染废水,考察了其光催化活性。结果表明,虽然所合成的不同形貌的ZnO样品在光照120 min后均能使KGL降解78%以上,但其中水热4 h得到的片花状ZnO光催化性能最好,可降解99%的KGL,这与其片花状的形貌、较大的比表面积、较多的表面氧缺陷和极性面有关。Hierarchical structure ZnO samples with different morphologies were synthesized by sol-gel assisted hydrothermal method,using Zn（NO3）2·6H2O,citric acid and Na OH as raw materials.Nanosheets flower-like ZnO,nanorods flower-like ZnO and spind-like ZnO microstructures could be synthesized only by controlling the time of hydrothermal reaction.The as-prepared samples were characterized by XRD,SEM,UV-Vis,DRS,photoluminescence（PL） and low temperature nitrogen adsorption-desorption.The formation mechanism of different morphologies of ZnO hierarchical structures was proposed.The photocatalytic activities of the samples were evaluated by the degradation of Reactive Blue 14（KGL） under UV irradiation.The results demonstrated that different morphologies of ZnO samples all showed good photocatalytic performance,with the degradation degree of KGL exceeding 78% after 120 min.But the sample prepared at 120 ℃ for 4 h exhibited superior photocatalytic activity to other ZnO samples,and the degradation rate of KGL can reach 99%.It might be attributed to the morphology,larger specific surface area,more oxygen surface defect and surface polarity.

关 键 词：sol-gel辅助水热法 ZNO 形貌 分级结构 光催化 

分 类 号：O643.36[理学—物理化学]