高等学校化学学报 ›› 2020, Vol. 41 ›› Issue (11): 2479-2487.doi: 10.7503/cjcu20200423

• 物理化学 • 上一篇    下一篇

氧化石墨烯调控钼酸铋在可见光下选择性光催化降解环境水中的抗生素

赵孟欣, 孟哲(), 李和平, 马宗琴, 詹海鹃, 刘万毅   

  1. 省部共建煤炭高效利用与绿色化工国家重点实验室, 化学国家级实验教学示范中心, 宁夏大学化学化工学院, 银川 750021
  • 收稿日期:2020-07-02 出版日期:2020-11-10 发布日期:2020-11-06
  • 通讯作者: 孟哲 E-mail:meng_z@nxu.edu.cn
  • 基金资助:
    国家自然科学基金(批准号(21966024);21768003)、 宁夏自然科学基金(2019AAC03020);宁夏回族自治区国内一流学科建设项目(NXYLXK2017A04)

Photodegradation of Antibiotic in Environmental Water by Graphene Oxide Modulation Bismuth Molybdate Under Visible Light Irradiation

ZHAO Mengxin, MENG Zhe(), LI Heping, MA Zongqin, ZHAN Haijuan, LIU Wanyi   

  1. State Key Laboratory of High?efficiency Utilization of Coal and Green Chemical Engineering,National Demonstration Center for Experimental Chemistry Education,College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China
  • Received:2020-07-02 Online:2020-11-10 Published:2020-11-06
  • Contact: MENG Zhe E-mail:meng_z@nxu.edu.cn
  • Supported by:
    Supported the National Natural Science Foundation of China(21966024);the Natural Science Foundation of Ningxia, China(2019AAC03020);the Discipline Project of Ningxia, China(NXYLXK2017A04)

摘要:

以氧化石墨烯(GO)作为增强光催化剂活性的调节剂, 采用一步水热法制备钼酸铋/氧化石墨烯(Bi2MoO6/GO)异质结光催化剂, 其可见光响应拓展至570 nm, 带隙能降至2.56 eV. 当mBi2MoO6/mGO=100∶1时, Bi2MoO6/GO(100∶1)光催化剂在可见光的辐射下, 对水溶液中四环素和喹诺酮类抗生素选择性的高效催化降解去除能力为Bi2MoO6的2.1倍. Bi2MoO6/GO(100∶1)光催化剂活性的提高依赖于范德华力作用下的二维Bi2MoO6纳米片-二维GO纳米片界面的紧密接触. 有效的界面接触改善了光生电子的转移和光生载流子的分离. 自由基清除实验结果表明, ?OH起主要作用. 结合高效液相色谱-质谱(HPLC-MS)法对降解产物的分析, 提出了不同光催化剂催化降解恩诺沙星具有相似的降解途径和降解产物.

关键词: 钼酸铋/氧化石墨烯, 光催化剂, 可见光辐射, 抗生素, 高效液相色谱-质谱

Abstract:

Using graphene oxide as an activity modulator of photocatalyst, a bismuth molybdate/graphene oxide(Bi2MoO6/GO) heterojunction was synthesized via one-step hydrothermal method. Using Bi2MoO6/GO(mBi2MoO6/mGO=100∶1) as photocatalyst, the visible light response was extended to 570 nm and the band gap energy was reduced to 2.56 eV compared to Bi2MoO6. The photodegradation activity with high selectivity of the Bi2MoO6/GO(100∶1) for quinolones, sulfonamides and tetracyclines antibiotics in the aqueous solution under visible light irradiation, which is improved by 2.1 times compared to Bi2MoO6. The enhancement of photodegradation antibiotics performance is due to addition of appropriate GO, the intimate interfacial contact and large contact area between Bi2MoO6 nanosheets and GO nanosheets via van der Waals forces. It is help to make full use of the electron conductivity of GO for transferring the photogenerated electrons and separating the photoproduced carriers. The radical trapping experiments show that ?OH is played a significant role in the photodegradation procedure. Finally, according to the oxidation products detected by high performance liquid chromato-graphy-mass spectrometric(HPLC-MS), similar degradation pathway and degradation products for the enrofloxacin was proposed compared with the different photocatalyst.

Key words: Bismuth molybdate/graphene oxide(Bi2MoO6/GO), Photocatalyst, Visible light irradiation, Antibiotics, High performance liquid chromatography-mass spectrometric(HPLC-MS)

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