Developing novel eco-friendly broad-spectrum visible light photocatalysts for dye removal is one of the urgent problems for water treatment. Here, copper-doped carbon dots (CDs) were reported to be directly fabricated from chromated copper arsenate (CCA) wood waste for the photocatalytic degradation of the methylene blue dye. The properties of the resulting CDs were thoroughly characterized and analyzed, preceding an investigation into the adsorption kinetics of dye degradation. The kinetic study showed that reactant concentration was the rate-limiting factor. The obtained CDs showed a 151 mg/g photocatalytic degradation capacity. Comparing pure CDs to CDs/TiO2 composites, the former demonstrated higher photodegradation efficiency. This superiority can be attributed to the synergistic action of adsorption and photocatalytic degradation working in tandem. This study prepared Cu doped CDs and elucidated the photocatalysis mechanism of methylene blue degradation by CDs. The photodegradation of organic dyes through CDs derived from waste CCA wood emerges as an eco-friendly, facile, and highly efficient method.

中文翻译：

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使用源自 CCA 木材的铜掺杂碳点一步可见光诱导光催化降解亚甲基蓝

开发新型环保型广谱可见光光催化剂用于去除染料是水处理的紧迫问题之一。据报道，铜掺杂碳点（CD）是直接由铬酸盐砷酸铜（CCA）木材废料制成的，用于亚甲基蓝染料的光催化降解。在研究染料降解的吸附动力学之前，对所得 CD 的特性进行了彻底的表征和分析。动力学研究表明反应物浓度是速率限制因素。所得CDs显示出151mg/g的光催化降解能力。比较纯 CD 与 CD/TiO2 复合材料，前者表现出更高的光降解效率。这种优越性可归因于吸附和光催化降解协同作用的协同作用。本研究制备了Cu掺杂CDs并阐明了CDs降解亚甲基蓝的光催化机制。通过从废 CCA 木材中提取的 CD 来光降解有机染料是一种环保、简便且高效的方法。