Waste photovoltaic wafers-derived SiC-based photocatalysts for pharmaceutical wastewater purification: S-scheme, waste utilization, and life cycle assessment

IF 11.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2025-04-25 DOI:10.1016/j.resconrec.2025.108332

Chengyao Teng , Qing Huang , Yunyan Cheng , Zhongyi Zhang , Li Zhang , Jianming Zhu , Lijun Xu , Qingbin Song , Zhenfeng Bian , Jinhui Li , Wenyi Yuan

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Abstract

Waste photovoltaic (PV) wafers recovered from modules by physical crushing contain high levels of impurities and are unsuitable for reuse. This research demonstrates the successful regeneration of SiC (r-SiC) nanowires photocatalysts from these discarded PV wafers. The r-SiC exhibits enhanced photoactivity and reduces environmental emissions compared to market SiC, as evidenced by a life cycle assessment. By synthesizing Zn_xCd_1-xS/r-SiC (Z_xC_1-xSS) photocatalysts featuring a S-scheme heterojunction and internal electric field (IEF)-driven •OH production capability, we have not only repurposed waste but also achieved an unprecedented leap in photocatalytic efficiency. The resulting 20 %Zn_0.2Cd_0.8S/r-SiC (20Z_0.2C_0.8SS) photocatalyst exhibited a remarkable 96.67 % cefaclor (CEC) degradation efficiency under visible light within 30 min—outperforming r-SiC by 126-fold and Zn_0.2Cd_0.8S by 44-fold, and enabling efficient pharmaceutical wastewater degradation. This pioneering research not only turns waste into a valuable resource but also establishes a new benchmark in photocatalytic technology, providing profound insights into the mechanisms underpinning Z_xC_1-xSS photocatalysts.

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废弃光伏晶圆衍生的硅基光催化剂用于制药废水净化：s方案、废物利用和生命周期评估

通过物理粉碎从组件中回收的废弃光伏（PV）晶圆含有高水平的杂质，不适合重复使用。本研究证明了从这些废弃的光伏晶圆中成功再生出SiC （r-SiC）纳米线光催化剂。生命周期评估证明，与市场上的SiC相比，r-SiC具有增强的光活性，并减少了环境排放。通过合成具有S-scheme异质结和内电场（IEF）驱动•OH生产能力的ZnxCd1-xS/r-SiC （ZxC1-xSS）光催化剂，我们不仅实现了废物的再利用，而且实现了光催化效率的前所未有的飞跃。所制备的20% Zn0.2Cd0.8S/r-SiC （20Z0.2C0.8SS）光催化剂在可见光下30 min内对头孢氯（CEC）的降解效率为96.67%，比r-SiC高126倍，比Zn0.2Cd0.8S高44倍，实现了对制药废水的高效降解。这项开创性的研究不仅将废物转化为宝贵的资源，而且还建立了光催化技术的新基准，为ZxC1-xSS光催化剂的基础机制提供了深刻的见解。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.