水热辅助溶胶凝胶法制备纳米钛酸锌及其光催化性能
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X703.5

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哈尔滨商业大学校级科研项目(17XN070)


Preparation and photocatalytic properties of zinc titanate nanoparticles prepared by hydrothermal assisted sol gel process
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    摘要:

    采用水热辅助的溶胶凝胶法制备纳米钛酸锌(ZnTiO3)光催化剂,以罗丹明B为目标降解物,运用动力学模型分析罗丹明B(RhB)初始浓度对降解效果的影响。通过SEM、XRD、XPS、UV-Vis DRS对ZnTiO3进行表征,并使用自由基捕获试验分析其降解机理。结果表明,ZnTiO3为纯六方相,形貌为类球形,粒径50 nm左右。在催化剂用量为1 g/L、RhB初始浓度为5 mg/L、pH值为3的条件下,光催化反应150 min后,RhB降解率为93.2%。其动力学方程为k=0.132C0-1.253。ZnTiO3光催化剂降解过程中,·OH、h+、·O2-均起到催化作用,产生·OH、h+的量相近且多于·O2-,说明·OH、h+在催化反应中起主要作用。

    Abstract:

    The nano-zinc titanate (ZnTiO3) photocatalyst was prepared by hydrothermal-assisted sol-gel method. Rhodamine B was taken as the target degradant. The effect of initial concentration of Rhodamine B (RhB) on the degradation was analyzed by kinetic model. ZnTiO3 was characterized by SEM, XRD, XPS and UV-Vis DRS. The degradation mechanism was analyzed by free radical trapping experiments. The results show that ZnTiO3 is a pure hexagonal phase with a spherical shape and a particle size of about 50 nm. Under the condition of catalyst dosage of 1 g·L-1, initial concentration of RhB of 5 mg/L and pH of 3, the degradation rate of RhB was 93.2% after photocatalytic reaction for 150 min. Its kinetic equation is k=0.132C0-1.253. In the degradation process of ZnTiO3 photocatalyst, ·OH, h+, ·O2- all play a catalytic role, and the amount of ·OH and h+ is similar and more than ·O2-, indicating that ·OH and h+ play a major role in the catalytic reaction.

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李俊生,徐美艳,关天宇,夏至,姜黎明,谭冲,左金龙.水热辅助溶胶凝胶法制备纳米钛酸锌及其光催化性能[J].土木与环境工程学报(中英文),2020,42(3):149-155.

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  • 收稿日期:2019-09-04
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  • 在线发布日期: 2020-06-13
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