掺Fe~(3+)改性A-TiO_2的合成及其对曙红的可见光催化降解性能
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摘要
采用水热法合成了系列含不同掺Fe~(3+)量的改性TiO_2粉末(1~x, x=0、 2、 4、 5、 6、 8,掺铁量分别为0、 2 mol%、 4 mol%、 5 mol%、 6 mol%和8 mol%),其结构和形貌经XRD和SEM表征。并研究可见光照下1~x对曙红降解的催化效果,考察了不同因素的影响和光催化剂对曙红的暗吸附性能。结果表明:1~x的晶体为单一锐钛矿型(A-TiO_2),由直径2～3μm的1~x微米球堆积而成;在15 mg·L~(-1)曙红溶液(pH=4)中,1~5投放量为7 g·L~(-1),于室温(18℃)可见光(功率40 W的白炽灯)照射反应3 h,曙红降解率D最大(63.1%),在该光催化优化条件下进行暗吸附,1.5 h达到吸附平衡,1~5对曙红吸附量为1.01 mg·g~(-1)。
The doping Fe~(3+) modified TiO_2 powder(1~x, x=0, 2, 4, 5, 6, 8, the doping Fe~(3+) amount was 0, 2 mol%, 4 mol%, 5 mol%, 6 mol% and 8 mol%, respectively), was synthesized by hydrothermal method. The structure and morphology were characterized by XRD and SEM. The catalytic effects of 1~x on the degradation of eosin under visible light was studied, the influence of different factors and the dark adsorption performance of the photocatalyst on eosin were investigated. The results showed that the crystal of 1~x was a single anatase type(A-TiO_2), which is composed of A-TiO_2 microsphere with a diameter of 2 μm and 3 μm. The degradation rate D of eosin was 63.1% under the following optimizing conditions: the initial concentration of eosin was 15 mg·L~(-1)(pH=4), the dosage of 1~5 was 7 g·L~(-1), and the illumination time was 3 h under visible light(40 W filament lamp) at room temperature(18 ℃). The dark adsorption was carried out under the optimum condition of photocatalysis, the adsorption equilibrium was reached for 1.5 h, the adsorption capacity of the synthesized catalyst to eosin was 1.01 mg·g~(-1).
The doping Fe~(3+) modified TiO_2 powder(1~x, x=0, 2, 4, 5, 6, 8, the doping Fe~(3+) amount was 0, 2 mol%, 4 mol%, 5 mol%, 6 mol% and 8 mol%, respectively), was synthesized by hydrothermal method. The structure and morphology were characterized by XRD and SEM. The catalytic effects of 1~x on the degradation of eosin under visible light was studied, the influence of different factors and the dark adsorption performance of the photocatalyst on eosin were investigated. The results showed that the crystal of 1~x was a single anatase type(A-TiO_2), which is composed of A-TiO_2 microsphere with a diameter of 2 μm and 3 μm. The degradation rate D of eosin was 63.1% under the following optimizing conditions: the initial concentration of eosin was 15 mg·L~(-1)(pH=4), the dosage of 1~5 was 7 g·L~(-1), and the illumination time was 3 h under visible light(40 W filament lamp) at room temperature(18 ℃). The dark adsorption was carried out under the optimum condition of photocatalysis, the adsorption equilibrium was reached for 1.5 h, the adsorption capacity of the synthesized catalyst to eosin was 1.01 mg·g~(-1).
引文
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[2] 杨在志,傅小明,王红侠,等.纳米二氧化钛光催化材料治理工业废水的研究[J].广东化工,2016,43(18):31-32.
[3] 刘丽静.纳米Yb3+-Er3+/TiO2的制备及其在降解染料废水中的应用[J].四川大学学报,2015,52(6):1339-1341.
[4] 高金霞,王元奕,李秀元,等.改性二氧化钛纳米棒的制备及其对有机污染物的光催化降解研究[J].中国无机分析化学,2015,5(4):92-94.
[5] 王家桓,宫长伟,付现凯,等.TiO2光催化剂的掺杂改性及应用研究进展[J].化工新型材料,2016,44(1):16-17.
[6] 张卓磊,王罗春,朱孟奇,等.二氧化钛光催化剂掺杂改性的研究进展[J].上海电力学院学报,2013,29(1):93-95.
[7] 金冲,张卫国,姚素薇,等.热处理工艺对TiO2纳米管阵列结构及其光电性能的影响[J].无机材料学报,2012,21(1):54-58.
[8] 赵然.锐钛矿型二氧化钛纳米材料的制备、表征及应用[D].长春:吉林大学,2015:37-38.
[9] 樊雪敏,白春华,李光辉,等.纳米二氧化钛光催化剂共掺杂的研究进展[J].无机盐工业,2016,48(10):8-10.
[10] CHOI W,TERMIN A,HOFFMANN M R.The role of metal ion dopants in quantum-sized TiO2:Correlation between photo reactivity and charge carried recombination dynamics[J].Phys Chem,1994,98(5):13669-13679.
[11] 张一兵,韩军燕,王园美,等.掺Fe3+A-TiO2的合成及其对酸性红B的光催化降解性能[J].合成化学,2017,25(7):612-616.
[12] 王磊,夏璐,金帅,等.硫掺杂二氧化钛光催化降解曙红Y溶液的研究[J].太阳能学报,2013,34(1):131-136.
[13] 吴忠杰,张国庆,傅李鹏,等.镍网负载纳米TiO2光催化反应器对酸性品红脱色效果实验研究[J].环境工程学报,2010,4(2):342-346.
[14] KASHIF N,FENG O.Preparation of Fe3+-doped TiO2 nanoparticles and its photo catalytic activity under UV light [J].Phys B,2010,405(1):221-226.
[15] ZHAO B X,GIUSEPPE M,IOLANDA P,et al.Degradation of 4-n-itrophenol(4-NP) using Fe-TiO2 as a heterogeneous photo-Fen-ton catalyst[J].J Hazard Mater,2010,176(1-3):569-574.
[16] 花朵,施春红,袁蓉芳,等.金属掺杂对纳米管TiO2光催化性能的影响[J].功能材料,2013,21(44):3163-3167.
[17] 李丽,朱琨,张兴,等.电动力学技术修复苯酚污染土壤的研究[J].环境污染与防治,2008,30(11):34-39.
[18] 王红侠,李新星,吴朝政,等.花状TiO2的制备及光催化性能研究[J].人工晶体学报,2016,45(10):2478-2482.
[19] 王知彩,李小君,王平.SO_4~(2-)改性TiO2催化降解茜素红水溶液[J].中国环境科学,2003,23(5):535-538.