Synthesis of binary and ternary nanocomposites based on g-C3N4 as efficient Z-scheme photocatalysts for visible-light degradation of water contaminant

IF 5.7 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces Pub Date : 2024-10-29 DOI:10.1016/j.surfin.2024.105367

Zahra Karimzadeh, Zahra Shariatinia

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Abstract

Several novel binary and ternary nanocomposites were synthesized based on g-C₃N₄, consisting of ZIF-8/OH-g-C₃N₄/La₂Sn₂O₇ with different ratios of OH-g-C₃N₄, pyrochlore La₂Sn₂O₇, and ZIF-8 materials. Moreover, photocatalytic degradation of Rhodamine B (RhB) aqueous solutions was done under visible light irradiation to examine photocatalytic characteristics of the resulting samples. All materials’ physicochemical characteristics were explored by diffuse reflectance spectra (DRS), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV–Vis) absorption, and emission photoluminescence (PL) spectra. The photocatalytic activities of ZIF-8, OH-g-C₃N₄, and La₂Sn₂O₇ pyrochlore as well as binary OH-g-C₃N₄/La₂Sn₂O₇ (5 %, 10 %, 15 %) materials were scrutinized in degradation process of RhB contaminant. It was established that the binary 10 %La₂Sn₂O₇/OH-g-C₃N₄ was the best sample with the highest photocatalytic activity. Therefore, ternary (10 %La₂Sn₂O₇/OH-g-C₃N₄)/ZIF-8 (5 %, 10 %, 15 %) photocatalysts were also tested for the RhB degradation. Among the ternary samples, the (10 %La₂Sn₂O₇/OH-g-C₃N₄)/10 % ZIF-8 was found to be the optimal photocatalyst, which degraded 97.1 % of RhB (10 ppm) at pH = 11 in 120 min. Furthermore, the optimal photocatalyst was applied for reusability and scavenger tests. Under optimal conditions (photocatalyst dose=0.10 g, pH = 11, RhB concentration=10 ppm), the photocatalyst exhibited a minor decline in degradation efficiency from 97.1 % to 80.5 % after five consecutive reactions. The optimal ternary photocatalyst illustrated a dual Z-scheme mechanism for the charge transfer processes. As a result, such photocatalyst is a potentially useful substance for use in industrial wastewater treatments.

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合成基于 g-C3N4 的二元和三元纳米复合材料，作为高效 Z 型光催化剂用于可见光下降解水污染物

研究人员以 g-C3N4 为基础，合成了几种新型二元和三元纳米复合材料，其中包括不同比例的 ZIF-8/OH-g-C3N4/La2Sn2O7 （OH-g-C3N4、火成岩 La2Sn2O7 和 ZIF-8 材料）。此外，还在可见光照射下对罗丹明 B（RhB）水溶液进行了光催化降解，以考察所得样品的光催化特性。通过漫反射光谱（DRS）、X 射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、能量色散 X 射线光谱（EDS）、傅立叶变换红外光谱（FTIR）、紫外可见光（UV-Vis）吸收和发射光致发光（PL）光谱，研究了所有材料的理化特性。研究了 ZIF-8、OH-g-C3N4 和 La2Sn2O7 热长石以及二元 OH-g-C3N4/La2Sn2O7 （5%、10%、15%）材料在降解 RhB 污染物过程中的光催化活性。结果表明，二元 10 %La2Sn2O7/OH-g-C3N4 是光催化活性最高的最佳样品。因此，三元（10 %La2Sn2O7/OH-g-C3N4 ）/ZIF-8（5 %、10 %、15 %）光催化剂也进行了降解 RhB 的测试。在三元样品中，(10 %La2Sn2O7/OH-g-C3N4)/10 %ZIF-8 被认为是最佳光催化剂，在 pH = 11 的条件下，120 分钟内降解了 97.1 % 的 RhB（10 ppm）。此外，最佳光催化剂还被用于可重复使用性和清除剂测试。在最佳条件下（光催化剂剂量=0.10 克，pH=11，RhB 浓度=10 ppm），光催化剂的降解效率在连续进行五次反应后略有下降，从 97.1% 降至 80.5%。最佳的三元光催化剂显示了电荷转移过程的双重 Z 型机制。因此，这种光催化剂是一种可用于工业废水处理的潜在有用物质。

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)