CAJ | 학술논문

温和条件下以碳酸铵为氮源,采用溶胶凝胶法制备氮掺杂二氧化钛粉末,以XRD、UV-Vis漫反射吸收光谱以及BET等手段对掺杂二氧化钛进行了表征.通过吸附等温线的计算以及可见光催化活性的测定,考察了氮掺杂二氧化钛对巯基苯并噻唑的降解动力学.结果显示,实验范围内所制备的样品均为锐钛矿相,样品粒径随N/Ti配比的增加而增大;氮的掺杂产生更多的孔结构和多样孔型,增大了光催化剂对有机物的吸附能力,且氮的掺杂增强了二氧化钛在可见光区的光吸收.通过Langmuir-Hinshelwood积分动力学模型对表观速率常数、吸附平衡常数及反应速率常数的分析,表明氮的掺杂有效地改善了二氧化钛的可见光活性,其中吸附能力的增大对表观速率常数的提高有更显著的贡献.
온화조건하이탄산안위담원,채용용효응효법제비담참잡이양화태분말,이XRD、UV-Vis만반사흡수광보이급BET등수단대참잡이양화태진행료표정.통과흡부등온선적계산이급가견광최화활성적측정,고찰료담참잡이양화태대구기분병새서적강해동역학.결과현시,실험범위내소제비적양품균위예태광상,양품립경수N/Ti배비적증가이증대;담적참잡산생경다적공결구화다양공형,증대료광최화제대유궤물적흡부능력,차담적참잡증강료이양화태재가견광구적광흡수.통과Langmuir-Hinshelwood적분동역학모형대표관속솔상수、흡부평형상수급반응속솔상수적분석,표명담적참잡유효지개선료이양화태적가견광활성,기중흡부능력적증대대표관속솔상수적제고유경현저적공헌.
With the elemental nitrogen source from ammonium carbonate, nitrogen-doped titania was produced through sol-gel method in mild condition. The catalysts were characterized with XRD, UV-Vis diffuse reflectance spectrophotometer and BET. Through the calculation of adsorption isotherm and the experiment of photoreaction under visible light, the degradation kinetics of nitrogen-doped titania on achromaticity 2-mercaptobenzothiazole was investigated. The results showed that all titania were anatase, and their crystallite size enlarged with increasing of N/Ti proportioning. And the doping formed multiporous structure, which en-hanced the adsorption capability. Due to the doping of nitrogen into titania lattice, the optical absorption intensity of nitrogen-doped titania enhances in visible light region. According to analysis of the apparent reaction kinetic constant, adsorption equilibrium con-stant, and photoreaction kinetic constant, which adopted with integral mode of the Langrnuir-Hinshelwood kinetics, it was obvious that the doping of nitrogen improved the photoreaction. Moreover, the larger apparent reaction kinetic constant was mainly due to the ameliorative adsorption capability.