高效稳定的AgxS的制备及其光催化性能

doi:10.1016/S1872-2067(14)60288-6

催化学报 ›› 2015, Vol. 36 ›› Issue (4): 564-571.DOI: 10.1016/S1872-2067(14)60288-6

高效稳定的Ag_xS的制备及其光催化性能

常平静^a,b,c, 程海洋^a,b, 林伟伟^a,b, 李小汝^a,b,c, 赵凤玉^a,b

a 中国科学院长春应用化学研究所,电分析化学国家重点实验室,吉林长春 130022;
b 中国科学院长春应用化学研究所,绿色化学与过程实验室, 吉林长春 130022;
c 中国科学院大学, 北京 100049

收稿日期:2014-11-23 修回日期:2015-01-08 出版日期:2015-03-23 发布日期:2015-03-23
通讯作者: Fengyu Zhao
基金资助:
国家自然科学基金(21273222).

A stable and active Ag_xS crystal preparation and its performance as photocatalyst

Pingjing Chang^a,b,c, Haiyang Cheng^a,b, Weiwei Lin^a,b, Xiaoru Li^a,b,c, Fengyu Zhao^a,b

a State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;
b Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;
c University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-11-23 Revised:2015-01-08 Online:2015-03-23 Published:2015-03-23
Supported by:
This work was supported by the National Natural Science Foundation of China (21273222).

摘要/Abstract

摘要：

分别采用水热法(Ag_xS-H)和原位离子交换法(Ag_xS-IE)制备了Ag_xS. 采用扫描电镜(SEM)、X射线衍射光谱、紫外可见近红外吸收光谱、N₂吸附-脱附、X射线光电子能谱和表面光电压测试对催化剂进行了表征. 以光(λ ≥ 420 nm)降解亚甲基蓝为模型反应, 考察了Ag_xS的光催化性能. 与Ag_xS-IE相比, Ag_xS-H具有较小的粒径、较大的禁带宽度、较低光生电荷复合率, 因此具有较高的光催化活性. 此外, Ag_xS-H还表现了较好的稳定性, 循环使用五次仍能够保持较高的光催化活性. 结果表明, Ag_xS光催化降解亚甲基蓝主要以羟基自由基氧化为主, 光生空穴氧化为辅的光催化氧化过程. Ag_xS-H作为一种有效的光催化剂, 在降解有机染料污水方面具有潜在的应用价值.

关键词: Ag_xS, 可见光照射, 光催化降解反应, 有机污染物, 禁带宽度

Abstract:

Ag_xS crystals were synthesized via hydrothermal (Ag_xS-H) and in situ ion-exchange (Ag_xS-IE) methods. The samples were characterized by scanning electron microscopy, X-ray diffraction, ultraviolet-visible-near infrared absorption spectroscopy, N₂ adsorption-desorption, X-ray photoelectron spectroscopy and surface photovoltage measurements. The photocatalytic performance was investigated for the decomposition of methyl blue (MB) under visible light irradiation (λ ≥ 420 nm). The Ag_xS-H had smaller particles, wider band gap and weaker recombination of photoinduced charges than Ag_xS-IE, resulting in a higher photocatalytic activity. Moreover, Ag_xS-H was stable, and could be reused five times without loss of photocatalytic activity. Additionally, a possible pathway for the photocatalytic degradation of MB over Ag_xS has been proposed, that MB was oxidized mainly by hydroxyl radicals and partly via electron holes generated in the Ag_xS. Ag_xS-H is an efficient photocatalyst and has great potential for the degradation of harmful organic dyes in wastewater.

Key words: Silver sulfide, Visible light irradiation, Photocatalytic degradation, Organic pollutants, Band gap

常平静, 程海洋, 林伟伟, 李小汝, 赵凤玉. 高效稳定的Ag_xS的制备及其光催化性能[J]. 催化学报, 2015, 36(4): 564-571.

Pingjing Chang, Haiyang Cheng, Weiwei Lin, Xiaoru Li, Fengyu Zhao. A stable and active Ag_xS crystal preparation and its performance as photocatalyst[J]. Chinese Journal of Catalysis, 2015, 36(4): 564-571.

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高效稳定的Ag_xS的制备及其光催化性能

A stable and active Ag_xS crystal preparation and its performance as photocatalyst

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高效稳定的AgxS的制备及其光催化性能

A stable and active AgxS crystal preparation and its performance as photocatalyst

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高效稳定的Ag_xS的制备及其光催化性能

A stable and active Ag_xS crystal preparation and its performance as photocatalyst