MoS2负载量对MoS2/TiO2光催化降解苯酚效率的影响及其作用机理研究

王芳; 王雪芹; 程凯; 王俊磊; 宋华

MoS₂负载量对MoS₂/TiO₂光催化降解苯酚效率的影响及其作用机理研究

王芳¹,
王雪芹¹,
程凯¹,
王俊磊¹,
宋华^{1, 2, ,}

1.
东北石油大学化学化工学院, 黑龙江大庆 163318
2.
东北石油大学石油与天然气化工省重点实验室, 黑龙江大庆 163318

基金项目:

黑龙江省博士后基金面上项目 LBH-Z15032

东北石油大学校青年科学基金 NEPUBS201508

详细信息

通讯作者:
宋华, Te1:0459-6503167, E-mail:songhua2004@sina.com

中图分类号: O643.361
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- 被引次数: 0
出版历程
- 收稿日期: 2017-04-10
- 修回日期: 2017-05-31
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-08-10

Effect of MoS₂ loading on the photocatalytic performance of MoS₂/TiO₂ nanocomposites in phenol degradation and the corresponding reaction mechanism analysis

1.
School of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China
2.
Provincial Key Laboratory of Oil & Gas Chemical Technology, Northeast Petroleum University, Daqing 163318, China

Funds:

the Province Postdoctoral Fund LBH-Z15032

Youth Fund of Northeast Petroleum University NEPUBS201508

摘要

摘要: 通过水解法制备TiO₂纳米颗粒，与经过超声处理后的MoS₂片层纳米材料复合制备MoS₂/TiO₂纳米催化剂，考察不同MoS₂负载量对其光催化降解苯酚效率及路径的影响。XRD、SEM、EDS、FT-IR和UV-vis DRS等表征结果表明，复合催化剂主要由锐钛矿型TiO₂和MoS₂组成；剥离后的MoS₂呈现薄片层状结构，均匀地分散在TiO₂纳米颗粒当中。光催化降解苯酚性能测试结果显示，对于MoS₂/TiO₂催化剂，MoS₂负载量的提高有利于光催化降解苯酚效率的提高；当MoS₂负载量为27%时，复合MoS₂/TiO₂纳米颗粒的光催化性能最佳，反应80 min后可将苯酚完全降解。通过对苯酚降解过程中生成中间产物跟踪发现，MoS₂负载量的提高有利于促进中间产物苯醌、对苯二酚以及邻苯二酚的生成，进而提升了MoS₂/TiO₂复合材料的光催化性能。
- MoS₂/TiO₂ /
- 光催化 /
- 苯酚 /
- 中间产物 /
- 降解机理
Abstract: MoS₂/TiO₂ nanocomposites was prepared by mixing MoS₂ with hydrothermally synthesized TiO₂; the effects of MoS₂ loading on the photocatalytic performance of MoS₂/TiO₂ in phenol degradation were investigated. The XRD, SEM, EDS, FT-IR and UV-vis DRS characterization results show that for the MoS₂/TiO₂ nanocomposites, lamellar MoS₂ is uniformly dispersed around the TiO₂ nanoparticles. The increase of MoS₂ loading is beneficial to the photocatalytic degradation of phenol; with a MoS₂ loading of 27%, the MoS₂/TiO₂ nanoparticles exhibited the highest photocatalytic activity, over which phenol can be completely degraded in 80 min. The intermediates during reaction are further tracked to investigate the reaction kinetics of photodegradation of phenol over MoS₂/TiO₂ nanocomposties. The results reveal that an increase in MoS₂ loading is able to promote the formation of various intermediates such as benzoquinone, hydroquinone and catechol, which can further enhance the overall photodegradation efficiency.
- MoS₂/TiO₂ /
- photocatalysis /
- phenol /
- intermediates /
- degradation mechanism

HTML全文

图 1 放大4 000X复合催化剂的SEM照片

Figure 1 SEM images of pure TiO₂ (a), 2.7% MoS₂/TiO₂ (b), 27% MoS₂/TiO₂ (c), 50% MoS₂/TiO₂ (d), untreated MoS₂ (e), ultrasonic exfoliated MoS₂ (f)

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图 2 MoS₂/TiO₂复合催化剂的红外光谱谱图

Figure 2 FT-IR spectra of MoS₂/TiO₂

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图 3 纯TiO₂纳米颗粒，未剥离MoS₂以及MoS₂/TiO₂复合材料的X射线衍射光谱谱图

Figure 3 XRD patterns of pure TiO₂, untreated MoS₂ and MoS₂/TiO₂ nanocomposites

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图 4 纯TiO₂纳米颗粒以及MoS₂/TiO₂复合材料的UV-vis谱图

Figure 4 UV-vis spectra of pure TiO₂ and MoS₂/TiO₂ nanocomposites

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图 5 苯酚及其反应中间产物在不同负载量MoS₂/TiO₂光催化作用下随时间变化的紫外-可见吸收光谱谱图

Figure 5 UV-vis spectra of the evolved intermediates during the photo-degradation phenol process collected at given time intervals; B, P, C, and H represent benzoquinone, phenol, catechol, and hydroquinone, respectively

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图 6 苯酚在MoS₂/TiO₂复合纳米颗粒催化作用下的降解路径示意图

Figure 6 Photocatalytic-decomposition pathways of phenol over MoS₂/TiO₂ nanocomposites

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图 7 不同催化剂作用下苯酚及其反应中间产物浓度随光照时间的变化

Figure 7 Evolution of phenol and hydroxylated phenolic intermediates upon irradiation over the MoS₂/TiO₂ catalysts with different MoS₂ loadings

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图 8 加入不同捕获剂对降解苯酚的影响

Figure 8 Effect of scavengers on the degradation of phenol

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图 9 MoS₂/TiO₂复合催化剂降解苯酚过程机理示意图

Figure 9 Proposed photocatalytic phenol and charge transfer mechanism over the MoS₂/TiO₂ nanocomposites

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表 1 复合催化剂的EDS元素分析

Table 1 Results of EDS spectra of MoS₂/TiO₂

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