Reduced graphene oxide modified Z-scheme AgI/Bi2MoO6 heterojunctions with boosted photocatalytic activity for water treatment originated from the efficient charge pairs partition and migration
Reduced graphene oxide modified Z-scheme AgI/Bi2MoO6 heterojunctions with boosted photocatalytic activity for water treatment originated from the efficient charge pairs partition and migration
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DOI：
10.1007/s11356-021-15180-y
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发表时间：
2021-07
影响因子：
5.8
通讯作者：
Chunyan Du;Luyue Yang;Shiyang Tan;Jiahao Song;Zhuo Zhang;Shitao Wang;Ying Xiong;Guanlong Yu
中科院分区：
文献类型：
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作者：
Chunyan Du;Luyue Yang;Shiyang Tan;Jiahao Song;Zhuo Zhang;Shitao Wang;Ying Xiong;Guanlong Yu
为了提高可见光（λ >420 nm）照射下罗丹明B（RhB）染料等有害有机污染物的降解效率，采用溶剂热法结合原位沉淀法制备了银/还原氧化石墨烯/铋钼酸铋（AgI/rGO/Bi 2 MoO 6）Z型异质结光催化剂。AgI（15重量%）/ rGO/Bi2MoO6在初始浓度为10 mg/L时，AgBMO-15的光催化活性最高，在30 min内RhB的去除率达到98.0%，分别比rGO/Bi 2 MoO 6（GBMO）复合材料、AgI粉末和Bi 2 MoO 6纳米片的去除率高65.8%、57.7%和72.7%，分别该新型光催化剂在较短的可见光照射时间内实现了比纯Bi 2 MoO 6高约3倍的光催化降解。通过光致发光分析和捕集实验，认为这是由于AgI和Bi 2 MoO 6接触界面处的内电场有效分离了光生电子-空穴对，产生了更多的超氧阴离子自由基（·O2-）作为主要反应物种，促进了RhB的降解。同时，rGO参与了可见光的捕获，在AgI/Bi 2 MoO 6界面起到了固体电子介质的作用，实现了有效的Z型电子转移路径，避免了光催化剂的自氧化，延长了载体寿命。此外，AGBMO-15光催化剂表现出良好的光催化降解稳定性，保持96.2%的RhB去除率后，四个循环的重复使用。由于其简单、可重复使用和可控性，该光催化剂在废水的环境修复方面具有良好的应用潜力。
In order to enhance degradation of harmful organic pollutants like Rhodamine B (RhB) dye under visible-light irradiation (λ >420 nm), a silver iodide/reduced graphene oxide/bismuth molybdate (AgI/rGO/Bi2MoO6) Z-scheme heterojunction photocatalyst was synthesized by a solvothermal process combined with an in-situ precipitation technique. The AgI (15 wt.%)/rGO/Bi2MoO6(AGBMO-15) photocatalyst with a dosage of 0.5 g/L exhibited the highest photocatalytic activity with 98.0% RhB removal under an initial concentration of 10 mg/L within 30 min. This removal rate was approximately 65.8%, 57.7%, and 72.7% higher than that for a rGO/Bi2MoO6(GBMO) binary composite, pure AgI powder, and pristine Bi2MoO6nanoplates, respectively. The novel photocatalyst achieved approximately three times higher photocatalytic degradation within a shorter period of visible-light irradiation than pure Bi2MoO6. Through photoluminescence analysis and trapping experiments, this outstanding performance was attributed to the efficient separation of photogenerated electron-hole pairs owing to an internal electric field at the contact interface of AgI and Bi2MoO6, which generated more superoxide radical anions (•O2–) as primary reactive species to promote RhB degradation. Meanwhile, the rGO participated in the capture of visible-light and played a role of solid electronic medium at the AgI/Bi2MoO6interface, which realized an effective Z-scheme electron transfer path, avoided the self oxidation of photocatalyst and prolonged the carrier life. Furthermore, the AGBMO-15 photocatalyst exhibited excellent photocatalytic degradation stability, maintaining an RhB removal rate of 96.2% after four cycles of reuse. Due to its simplicity, reusability, and controllability, the proposed photocatalyst has excellent application potential for the environmental remediation of wastewater.Graphical abstract