A novel 0D/3D Z-Scheme heterojunction ZnS/MIL-88(A) with significantly boosted photocatalytic activity toward tetracycline

IF 4.3 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
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Abstract

Coupling two different photocatalytic materials to construct a heterojunction is a preferable strategy for obtaining the composite photocatalyst with high activity. Herein, a novel 0D/3D Z-scheme heterostructure ZnS/MIL-88(A) was constructed by anchoring 0D ZnS nanoparticles on the surface of the 3D MIL-88(A). The prepared ZnS/MIL-88(A) was characterized by using FT-IR, XRD, SEM, UV–vis and XPS. The photodegradation of tetracycline (TC) was conducted under the irradiation of visible light to evaluate the photocatalytic performance of ZnS/MIL-88(A). The creation of the Z-scheme heterostructure between ZnS and MIL-88(A) enables ZnS/MIL-88(A) to exhibit excellent visible-light absorption ability and dramatically boost separation and transfer of the photo-induced charge carriers. Compared with MIL-88(A), ZnS/MIL-88(A) shows prominently enhanced photocatalytic activity toward tetracycline, achieving a TC degradation rate of 94 %. The highest photodegradation rate constant (0.02083 min−1) of TC by ZnS/MIL-88(A) is 7.77 and 12.33 folds as large as those by MIL-88(A) and ZnS, respectively. After five cycles of reuse, ZnS/MIL-88(A) shows only a slightly decreased TC removal rate, presenting excellent photo-stability. Furthermore, the Z-scheme interfacial charge migration mode and the photocatalytic mechanism of ZnS/MIL-88(A) were discussed according to the band position as well as the identification result of the active species. The radicals ·O2 and ·OH generated in photocatalysis serve as major reactive species to decompose TC. This work provides a new way for designing efficient composite photocatalysts.
一种新型 0D/3D Z-Scheme 异质结 ZnS/MIL-88(A),可显著提高对四环素的光催化活性
将两种不同的光催化材料耦合起来构建异质结是获得高活性复合光催化剂的首选策略。本文通过在三维 MIL-88(A) 表面锚定 0D ZnS 纳米颗粒,构建了新型 0D/3D Z 型异质结构 ZnS/MIL-88(A)。利用傅立叶变换红外光谱、X 射线衍射、扫描电镜、紫外可见光和 XPS 对制备的 ZnS/MIL-88(A)进行了表征。在可见光照射下进行了四环素(TC)的光降解实验,以评估 ZnS/MIL-88(A) 的光催化性能。ZnS 与 MIL-88(A)之间的 Z 型异质结构使 ZnS/MIL-88(A) 具有优异的可见光吸收能力,并显著促进了光诱导电荷载流子的分离和转移。与 MIL-88(A)相比,ZnS/MIL-88(A) 对四环素的光催化活性显著增强,其 TC 降解率达到 94%。ZnS/MIL-88(A) 对四环素的最高光降解速率常数(0.02083 min-1)分别是 MIL-88(A) 和 ZnS 的 7.77 倍和 12.33 倍。在重复使用五个周期后,ZnS/MIL-88(A) 对 TC 的去除率仅略有下降,具有极佳的光稳定性。此外,根据带位置和活性物种的鉴定结果,讨论了 Z 型界面电荷迁移模式和 ZnS/MIL-88(A) 的光催化机理。光催化过程中产生的自由基 -O2- 和 -OH 是分解 TC 的主要反应物。这项工作为设计高效的复合光催化剂提供了一条新途径。
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来源期刊
Journal of Physics and Chemistry of Solids
Journal of Physics and Chemistry of Solids 工程技术-化学综合
CiteScore
7.80
自引率
2.50%
发文量
605
审稿时长
40 days
期刊介绍: The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.
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