NCQDS/TiO2光解甲基橙研究

楚雄师范学院学报 ›› 2020, Vol. 35 ›› Issue (6): 97-103.

NCQD_S/TiO₂光解甲基橙研究

吴芳芳¹, 陈颖¹, 董帅^1,2, 刘瑞来¹, 林皓^1,*

1.武夷学院生态与资源工程学院,福建武夷山 354300;
2.贵州茅台酒厂（集团）习酒有限责任公司,贵州贵阳 550000

收稿日期:2020-07-31 出版日期:2020-11-20 发布日期:2021-03-29
通讯作者: * 林皓,男,硕士,武夷学院生态与资源工程学院教授,主要研究方向为环境功能材料。E-mail：48717294@qq.com. Tel.18094172179
作者简介:吴芳芳（1987–）,女,硕士,武夷学院生态与资源工程学院讲师,主要研究方向为环境功能材料研究与教学工作。E-mail：406046430@qq.com,Tel.18359925803
基金资助:
福建省自然科学基金项目（NO.2018J05092）; 福建省高校产学研合作项目（NO.2018Y4011）; 福建省中青年教师教育科研项目（NO.JAT170596、NO.JAT190773）; 南平市科技计划项目（NO.N2017DN06）; 武夷学院基金（NO.XQ1210、NO.XD201703,XD201808）; 大学生创新创业训练项目（NO.201710397016）; 武夷学院教改项目（NO.JG202006）,横向项目（NO.2018WH001）

Photocatalytic Degradation Mechanism of Methyl Orange by N-doped Carbon Quantum Dots Loaded on TiO₂

WU Fangfang, CHEN Ying, DONG Shuai, LIU Ruilai, LIN Hao

College of Ecology and Resources Engineering, Wuyi University, Wuyishan, Fujian Province 354300;
Xijiu Co., Ltd., Kuweichow Moutai Winery (Group), Guiyang, Guizhou Province 550000

Received:2020-07-31 Online:2020-11-20 Published:2021-03-29

摘要/Abstract

摘要： 通过一种简便的水热法制备N掺杂碳量子点（NCQD_S）/ TiO₂复合光催化材料NCP,利用SEM、XRD以及FT-IR对改性后NCP的形貌、晶体结构以及官能团进行表征,同时评估NCP对甲基橙的光催化降解效果。研究结果显示：TiO₂和NCP均以锐钛矿型为主,并伴有少量金红石型晶体结构,制备过程NCQD_S特征基团未产生明显影响;当NCQD_S负载量为20%,NCP投加量为0.5 g/L,pH=3,初始甲基橙浓度为10 mg/L时,4 h后NCP对甲基橙的降解率可达到85.5% 以上;酸性条件有利于光催化对甲基橙的降解。NCP对甲基橙的降解过程符合Langmuir-Hinshelwood（L-H）动力学模型,表观速率常数与甲基橙初始浓度呈负相关关系。NCP复合催化剂具有较强的稳定性,可连续循环使用。

关键词: N掺杂改性, TiO₂, 复合催化剂光催化

Abstract: In this study, N-doped carbon quantum dots (NCQD_S)/TiO₂ composite photocatalytic material NCP was successfully prepared by a simple hydrothermal method. The morphology, crystal structure and functional groups of the prepared composite photocatalytic material were characterized by SEM, XRD and FTIR. Meanwhile, the effects of preparation conditions and degradation conditions on the degradation of methyl orange using the prepared composite photocatalytic material were investigated. The results showed that TiO₂and NCP are mainly anatase type, accompanied by a small amount of rutile crystal structure. The NCQDS characteristic group has no obvious influence during the preparation process. The efficiency of methyl orange degradation could reach over 85.5% after 4 hours when the loading amount of NCQDS was 20%, the amount of NCP was 0.5g/L and the pH was 3. The acidic solutions were favorable for photocatalytic degradation of methyl orange. The degradation process of methyl orange by NCP accords with the first-order kinetic model of Langmuir-Hinshelwood (L-H), and the apparent rate constant decreases with the increase of initial concentration of methyl orange. The NCP has good stability and can be reused.

Key words: N-doped modification, TiO₂, composite catalyst photocatalysis

中图分类号:

O643.36

吴芳芳, 陈颖, 董帅, 刘瑞来, 林皓. NCQD_S/TiO₂光解甲基橙研究[J]. 楚雄师范学院学报, 2020, 35(6): 97-103.

WU Fangfang, CHEN Ying, DONG Shuai, LIU Ruilai, LIN Hao. Photocatalytic Degradation Mechanism of Methyl Orange by N-doped Carbon Quantum Dots Loaded on TiO₂[J]. Journal of Chuxiong Normal University, 2020, 35(6): 97-103.

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NCQD_S/TiO₂光解甲基橙研究

Photocatalytic Degradation Mechanism of Methyl Orange by N-doped Carbon Quantum Dots Loaded on TiO₂

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