Synthesis of highly fluorescent carbon quantum dots from rubber seed shells for the adsorption and photocatalytic degradation of dyes

吸附 光致发光 降级(电信) 光催化 光化学 荧光 亚甲蓝 刚果红 碳纤维 材料科学 化学工程 朗缪尔吸附模型 量子产额 化学 催化作用 有机化学 复合材料 电信 物理 复合数 计算机科学 工程类 光电子学 量子力学
作者
Nurul Umairah M. Nizam,‪Marlia M. Hanafiah‬,Ebrahim Mahmoudi,Abdul Wahab Mohammad
出处
期刊:Scientific Reports [Nature Portfolio]
卷期号:13 (1) 被引量:38
标识
DOI:10.1038/s41598-023-40069-w
摘要

The potentials of biomass-based carbon quantum dot (CQD) as an adsorbent for batch adsorption of dyes and its photocatalytic degradation capacity for dyes which are congo red (CR) and methylene blue (MB) have been conducted in this study. The CQDs properties, performance, behaviour, and photoluminescence characteristics were assessed using batch adsorption experiments which were carried out under operating conditions including, temperature, pH and dosage. The morphological analysis revealed that CQDs are highly porous, uniform, closely aligned and multi-layered. The presence of hydroxyl, carboxyl and carbonyl functional groups indicated the significance of the oxygenated functional groups. Spectral analysis of photoluminescence for CQDs confirmed their photoluminescent quality by exhibiting high excitation intensity and possessing greenish-blue fluorescence under UV radiation. The removal percentage of the dyes adsorbed for both CR and MB dyes was 77% and 75%. Langmuir isotherm and pseudo-second-order models closely fitted the adsorption results. Thermodynamics analysis indicated that the adsorption process was exothermic and spontaneous, with excellent reusability and stability. The degradation efficiency of CQDs on both dyes was more than 90% under sunlight irradiation and obeyed the first-order kinetic model. These results demonstrated CQDs to be an excellent adsorbent and outstanding photocatalyst for organic dye degradation.
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