NaOH浓度对水热合成TiO_2纳米管形成及光催化性能的影响  

Effect of NaOH Concentration on Formation and Photocatalytic Performance of TiO_2 Nanotubes Prepared by Hydrothermal Method

作　　者：张政[1] 郏建奎 蒋彩云[2] 黄文鑫 冯长生 王玉萍[1] Zhang Zheng;Jia Jiankui;Jiang Caiyun;Huang Wenxin;Feng Changsheng;Wang Yuping(Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control,Nanjing Normal University,Nanjing 210023,China;Department of Engineering and Technology,Jiangsu Institute of Commerce,Jiangsu Engineering and Research Center of Food Safety,Nanjing 210007,China)

机构地区：[1]南京师范大学江苏省物质循环与污染控制重点实验室,江苏南京210023 [2]江苏经贸职业技术学院工程技术系,江苏省食品安全工程技术研发中心,江苏南京210007

出　　处：《南京师大学报（自然科学版）》2018年第3期52-58,64,共8页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：国家自然科学基金(51578295)、江苏省自然科学基金(BK20161479)、江苏省高校自然科学研究项目(16KJB150043).

摘　　要：以二氧化钛P25和NaOH为原料,通过水热法制备TiO_2纳米管,考察了碱浓度对纳米管形成、晶型和形貌的影响.采用XRD、TEM、BET、XPS等对产物的组成、结构和形貌进行表征.结果表明,NaOH浓度高于10 mol/L及以上时才能将体系中的P25颗粒溶解-结晶形成钛酸钠卷曲体;水洗、酸洗和煅烧是形成锐钛矿相二氧化钛纳米管的必要步骤.当NaOH浓度为10 mol/L时,纳米管的比表面积达到213.30 m^2/g,为P25的4.2倍;金卤灯下照射24 min对20 mg/L亚甲基蓝的降解率可达100%,而P25仅为63.38%.TiO 2 nanotubes were prepared via hydrothermal synthesis by taking titanium dioxide P25 and NaOH as raw materials.The effects of alkali concentration on nanotube formation,crystal form and morphology were investigated.The composition,structure and morphology of the as-prepared samples were characterized by XRD,TEM,BET and XPS.The results showed that the P25 particles in the system can be dissolved and crystallized to form sodium titanate curl body when the NaOH concentration was higher than 10 mol/L.The steps of washing,pickling and calcination were necessary to form anatase phase titanium dioxide nanotubes.When the concentration of NaOH was 10 mol/L,the specific surface area of nanotubes reached 213.30 m 2/g,which was 4.2 times as much as that of P25.In photodegradation test,when exposed to metal halide lamp for 24 min,the degradation rate of 20 mg/L methylene blue reached 100%for titanium dioxide nanotubes and 63.38%for P25,respectively.

关 键 词：NaOH浓度 TIO2纳米管 水热法 光催化 亚甲基蓝 

分 类 号：O643[理学—物理化学] X703A[理学—化学]