Facile construction of 2D/2D δ-Bi2O3/Cu2ZnSnS4 heterojunction with the immobilization on gel beads for the photocatalysis

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-07-01 DOI:10.1016/j.apsusc.2025.163962

Haixin Li , Qiushi Wu , Fenglan Peng , Yuyue Tao , Yucheng Huang , Lin Zhou , Wenjin Yue

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Abstract

In this paper, a novel 2D/2D photocatalyst of δ-Bi₂O₃/Cu₂ZnSnS₄ (BO/CZTS) heterojunction was constructed to enhance the photocatalysis, with its immobilization for improved reusability further. Initially, BO with nanoflakes-assembled net-like structure was prepared with microwave-solvothermal method. Subsequently, epitaxial growth of CZTS nanoflakes was conducted on surface modified BO by 3-mercaptopropionic acid (MPA), which inserted into BO network to form a staggered stacked net-like architecture. The presence of MPA generated additional interaction with Rhodamine B (RhB) for increased adsorption. 2D/2D BO/CZTS heterojunction not only provided the favorable energy level for S-scheme charge transfer but also increased the interface area, contributing to effective charge separation for the decomposition. Therefore, BO/CZTS heterojunction displayed obviously enhanced photocatalysis than individual BO and CZTS. To improve the reusability of photocatalysts, the hydrogel substrate with sodium alginate (SA) and polyvinyl alcohol (PVA) was used to immobilize BO/CZTS heterojunction to form SA/PVA − BO/CZTS gel beads. The gel beads displayed excellent structural stability, including resistance to stress–strain, high temperature, acid, alkali and oxidants. Moreover, the abundant and uniformly distributed pores within the gel beads facilitated the mass transfer of pollutants. SA/PVA − BO/CZTS gel beads as the macroscopic-scaled photocatalysts displayed potential in the construction of photocatalytic reactor to apply in the practical wastewater treatment.

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2D/2D δ-Bi2O3/Cu2ZnSnS4异质结的快速构建及凝胶珠固定化光催化

本文构建了一种新型的δ-Bi2O3/Cu2ZnSnS4 （BO/CZTS）异质结的2D/2D光催化剂，通过固定化进一步提高了光催化的可重复使用性。首先，采用微波-溶剂热法制备了具有纳米片组装网状结构的BO。随后，在3-巯基丙酸（MPA）修饰的BO表面上外延生长CZTS纳米片，并将其插入BO网络中形成交错堆叠的网状结构。MPA的存在与Rhodamine B （RhB）产生额外的相互作用，以增加吸附。2D/2D BO/CZTS异质结不仅为S-scheme电荷转移提供了有利的能级，而且增加了界面面积，有助于有效分离分解中的电荷。因此，BO/CZTS异质结的光催化性能明显强于单独的BO和CZTS。为了提高光催化剂的可重复使用性，采用海藻酸钠（SA）和聚乙烯醇（PVA）水凝胶底物固定BO/CZTS异质结，形成SA/PVA − BO/CZTS凝胶珠。凝胶珠具有良好的结构稳定性，包括抗应力-应变、耐高温、耐酸、耐碱和抗氧化剂。此外，凝胶珠内丰富且均匀分布的孔隙有利于污染物的传质。SA/PVA − BO/CZTS凝胶珠作为宏观尺度光催化剂，在光催化反应器建设中具有应用于实际废水处理的潜力。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.