Vyas Yogeshwari, Chundawat Priyanka, Dharmendra Dharmendra, Chaubisa Purnima, Kumar Mukesh, Punjabi Pinki B, Ameta Chetna
Photochemistry Laboratory, Department of Chemistry, University College of Science, M.L. Sukhadia University Udaipur-313001 Rajasthan India
Department of Chemistry, Sahu Jain Degree College, Affiliated toM. J. P. Rohilkhand University, Bareilly Najibabad Bijnor-246763 India.
Nanoscale Adv. 2023 Aug 23;5(18):4833-4851. doi: 10.1039/d3na00268c. eCollection 2023 Sep 12.
The sustainable management of wastewater and the production of clean fuel with a reduced carbon footprint require innovative methods, including photocatalytic degradation of pollutants and hydrogen generation. To achieve this, biosynthesized photocatalysts are necessary, with carbon quantum dots (CQDs) being a promising candidate for achieving this goal. In this study, CQDs were prepared from water caltrop peels and a composite of greenly synthesized CQDs with copper selenide (CuSe) was used for the photocatalytic degradation of pollutants and production of fuel. Thymol blue (TB) and Congo red (CR) were chosen as model dyes for degradation studies, with optimized reaction conditions being determined by varying the dose, pH, intensity, and concentration of dyes. The composite (CuSe@CQDs) showed a degradation rate of 99.4% and 97.8% for TB and CR, respectively, within 60 minutes, with a corresponding hydrogen production rate of 2360 and 1875 μmol g h. The yield of hydrogen production using the composite was 35.7 and 29 times greater than that of CuSe alone for TB and CR, respectively. Spectroscopic techniques such as XRD, UV-Vis, FESEM, HRTEM, XPS, FTIR, BET, and TGA were used to characterize the composite, and the results revealed that the composite had superior degradation rates compared to CuSe alone, with the degradation rate being enhanced by about three times. GCMS analysis was used to investigate the intermediate and possible degradation pathways. Overall, this study highlights the potential of biosynthesized CQDs as effective photocatalysts for the sustainable management of wastewater and production of fuel.
废水的可持续管理以及生产具有更低碳足迹的清洁燃料需要创新方法，包括污染物的光催化降解和制氢。要实现这一目标，生物合成的光催化剂是必要的，碳量子点（CQDs）是实现这一目标的有前景的候选材料。在本研究中，从菱角皮制备了CQDs，并将绿色合成的CQDs与硒化铜（CuSe）的复合材料用于污染物的光催化降解和燃料生产。选择百里酚蓝（TB）和刚果红（CR）作为降解研究的模型染料，通过改变染料的剂量、pH值、强度和浓度来确定优化的反应条件。该复合材料（CuSe@CQDs）在60分钟内对TB和CR的降解率分别为99.4%和97.8%，相应的产氢率分别为2360和1875 μmol g h。使用该复合材料的产氢量分别比单独使用CuSe时对TB和CR的产氢量高35.7倍和29倍。使用XRD、UV-Vis、FESEM、HRTEM、XPS、FTIR、BET和TGA等光谱技术对该复合材料进行了表征，结果表明该复合材料与单独的CuSe相比具有更高的降解率，降解率提高了约三倍。使用GCMS分析来研究中间产物和可能的降解途径。总体而言, 本研究突出了生物合成的CQDs作为废水可持续管理和燃料生产的有效光催化剂的潜力。
