Can the treatment of urea-derived g-C3N4 with H2SO4 be optimized by varying the acid concentration to enhance the efficiency of photocatalytic Cr(VI) reduction?

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-08-14 DOI:10.1016/j.apcata.2025.120506

Jana Petrović , Željko Radovanović , Khaja Mohaideen Kamal , Mina Medić , Sanja Kuzman , Michael Gasik , Maja Popović , Đorđe Janaćković , Blaž Likozar , Rada Petrović

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引用次数: 0

Abstract

Urea-derived g-C₃N₄ (BCN) was treated with H₂SO₄ at different concentrations: very dilute (0.04 M), dilute (1 M and 4 M) and concentrated, with or without KMnO₄. Increasing concentration led to a decrease in specific surface area (Sp), widening of the band gap (BG) and an increase in the acidic group content. Structural reorganization after the dissolution in concentrated H₂SO₄ led to the formation of much larger particles, especially when KMnO₄ was used. These samples had much lower S_p, wider BG, and a large difference in electron-hole recombination rates, which was attributed to different distributions of oxygen-containing groups. Despite the reduction in S_p, the H₂SO₄-treated samples exhibited a higher efficiency of Cr(VI) reduction under UV than BCN. Conversely, the enlarged BG affected the activity of the modified samples under visible light. The Cr(VI) reduction is dependent on pH during photocatalysis, which decreases as the content and acidity of surface groups increases.

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是否可以通过改变酸浓度来优化H2SO4处理尿素衍生的g-C3N4，以提高光催化还原Cr（VI）的效率？

尿素衍生的g-C3N4 （BCN）用不同浓度的H2SO4处理：极稀（0.04 M）、稀（1 M和4 M）和浓（含或不含KMnO4）。浓度增加导致比表面积（Sp）减小，带隙（BG）变宽，酸性基团含量增加。在高浓度H2SO4中溶解后，结构重组导致形成更大的颗粒，特别是当使用KMnO4时。这些样品具有较低的Sp、较宽的BG和较大的电子-空穴复合率差异，这是由于含氧基团的分布不同所致。尽管降低了Sp，但h2so4处理的样品在UV下的Cr（VI）还原效率高于BCN。相反，增大的BG影响了改性样品在可见光下的活性。光催化过程中Cr（VI）的还原依赖于pH值，pH值随表面基团含量和酸度的增加而降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.