期刊信息
- 刊名： 河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
- 主办： 河北师范大学
- ISSN： 1000-5854
- CN： 13-1061/N
- 中国科技核心期刊
- 中国期刊方阵入选期刊
- 中国高校优秀科技期刊
- 华北优秀期刊
- 河北省优秀科技期刊
溶胶凝胶法制备大孔/介孔Zn/Sm共掺杂纳米TiO2及光催化性能
- 安阳师范学院 化学与化工学院, 河南 安阳 455000
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DOI：10.13763/j.cnki.jhebnu.nse.2016.01.010
Synthesis and Photocatalytic Property of Macroporus/mesoporous Zn/Sm-codoped TiO2 Prepared by Sol-gel Method
摘要/Abstract
以无水乙醇为溶剂,聚苯乙烯和P123为模版剂,醋酸为抑制剂,以钛酸四丁酯、六水合硝酸钐和二水合乙酸锌为原料,采用溶胶-凝胶法制备了大孔/介孔不同掺杂量的锌/钐纳米TiO2光催化材料.采用X线衍射仪、傅里叶变换红外光谱仪、场发射扫描电镜、差热-热重分析仪、紫外-可见吸收光谱仪、比表面及孔隙度分析仪对其晶型、结构、形貌、热稳定性、光学性能和比表面积进行了表征.结果表明,锌/钐共掺杂离子能够抑制TiO2的晶型转变,降低了TiO2的禁带宽度,增加了吸收光的范围.对合成的锌/钐共掺杂纳米TiO2, 在紫外-可见光照射下,以苯酚为探针分子进行了光催化性能的测试,结果表明,掺杂比例n(Zn):n(Sm):n(TiO2)=2.0:2.0:100,煅烧温度750℃时催化活性最高,180min后苯酚降解率达到91.74%.
Zn/Sm-codoped TiO2 photocatalysts with various dopant amounts were prepared by the sol-gel method with ethanol as solvent,glacial acetic acid as inhibitors,tetrabutyl titanate and Zn(CH3COO)2·2H2O,Sm(NO3)3·6H2O as reaction precursors,PS and P123 as surfact ants.There photocatalysts were characterized by XRD,FTIR,SEM,EDS,TG-DSC,UV-vis and BET.Experimental results showed that the dopont of Zn and Sm can inhibit the crystal-phase transformation and narrowen the band gap of TiO2,resulting to absorb more light.In order to evaluate the photocatalytic activity of these as-prepared samples,photocatalytic degradation of phenol was carried out with the presence of oxygen under UV-vis light irradiation.The experimental results showed that the photocatalytic behavior of Zn/Sm-codoped TiO2 photocatalyst with the doping amount of 2.0% and the calcination temperature of 750℃ was better in comparison with other samples,and the photodecomposition efficiency can be being up to 91.74% under UV-vis irradiation of 180min in our experiments.
关键词
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