Enhanced photocatalytic hydrogen evolution via Nitrogen and Sulfur Co‐functionalized Carbon Quantum Dot‐Modified ZnO nanocomposites: Experimental insights and mechanistic understanding

IF 7.2 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering Pub Date : 2025-09-11 DOI:10.1016/j.jece.2025.119249

H.J. Yashwanth , M. Madhukara Naik , Udayabhanu , M. Prathap Kumar , M. Vinuth , M.S. Dileep , K.N. Narasimha murthy

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Abstract

A chemical reaction that breaks down water into hydrogen and oxygen is fueled by light, usually sunlight, in a process known as photocatalytic H₂ production. The objective is to use solar energy to create clean hydrogen fuel, which is a viable source of sustainable energy that may be utilized in fuel cells, transportation, and other energy applications. Herein, we report the hydrogen generation efficiency of Nitrogen and sulfur co-functionalized NS-CDOTs/ZnO (NSCZ) nanocomposite. The hydrothermal process was used to synthesize. The prepared NSCZ nanocomposites were characterized by Raman, XRD, FTIR, XPS, Photoluminescence and UV-Visible spectroscopic studies. The developed NSCZ nanocomposite exhibits improved photocatalytic hydrogen generation activity of 378 μmolh⁻¹g⁻¹ which is ten times superior to that of ZnO (38 μmolh⁻¹g⁻¹). The decreased bandgap, reduced recombination rate, and better work function of the photogenerated eˉ,-h⁺ pair of NSCZ photocatalysts are responsible for the enhanced photocatalytic hydrogen generation. The NSCZ nanocomposite exhibited active photodegradation for Methylene blue dye under visible light.

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通过氮和硫共功能化碳量子点修饰ZnO纳米复合材料增强光催化析氢：实验见解和机制理解

将水分解为氢和氧的化学反应是由光（通常是阳光）推动的，这一过程被称为光催化制氢。目标是利用太阳能制造清洁的氢燃料，这是一种可行的可持续能源，可用于燃料电池，运输和其他能源应用。本文报道了氮和硫共功能化的NS-CDOTs/ZnO （NSCZ）纳米复合材料的产氢效率。采用水热法合成。采用拉曼光谱、XRD、FTIR、XPS、光致发光和紫外可见光谱对制备的NSCZ纳米复合材料进行了表征。NSCZ纳米复合材料的光催化产氢活性为378 μmolh−1g−1，是ZnO （38 μmolh−1g−1）的10倍。NSCZ光催化剂的带隙减小、复合速率降低、功函数改善是光催化产氢增强的主要原因。NSCZ纳米复合材料在可见光下对亚甲基蓝染料表现出良好的光降解活性。

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来源期刊

Journal of Environmental Chemical Engineering Environmental Science-Pollution

CiteScore

11.40

自引率

6.50%

发文量

2017

审稿时长

27 days

期刊介绍： The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.