Ibrahim Amr Awad, Kospa Doaa A, Orabi Salah, Abo Kamar Salma M, Salah Ahmed A, El-Sharkawy E A, El-Hakam S A, Ahmed Awad I
Department of Chemistry, Faculty of Science, Mansoura University Al-Mansoura Egypt
Department of Chemistry, Faculty of Science, Suez University Suez Egypt.
RSC Adv. 2025 Jul 25;15(33):26608-26622. doi: 10.1039/d5ra04049c.
Semiconductor-based heterogeneous photocatalysis generates highly reactive charge carriers under solar illumination, making it a successful approach for wastewater purification and energy production applications. Herein, a simple solvothermal approach was used to generate a promising nanocomposite photocatalyst, reduced graphene oxide/bismuth tungstate (rGO/BiWO). Various analytical tools were utilized to characterize the as-prepared catalysts. The oxidation of methylene blue (MB) and rhodamine B (RhB) dyes in the presence of solar light was performed to assess the photocatalytic activity of the rGO/BiWO combination. Also, photoelectrochemical (PEC) water splitting as an efficient and cost-effective way of producing hydrogen from water using solar energy is tested. The effect of the calcination temperature of BiWO and the amounts of graphene oxide on the catalytic activity was studied. After 30 minutes of exposure, the synthesised 10rGBW calcined at 700 °C (10rGBW-IV) showed good photodegradation percentages of 100.0% and 87.6% for MB and RhB dyes, respectively. Also, the larger photocurrent response intensity and lower arc radius of the electrochemical impedance of rGO/BiWO compared to BiWO revealed the synergistic effect on BiWO visible light responsiveness. According to the Mott-Schottky curve, 10rGBW-IV demonstrates a larger negative shift of the Fermi level (FB = -0.08 V RHE), indicating a stronger oxidation potential for water splitting.
基于半导体的多相光催化在太阳光照射下会产生高活性电荷载流子，这使其成为废水净化和能源生产应用的一种成功方法。在此，采用一种简单的溶剂热法制备了一种有前景的纳米复合光催化剂——还原氧化石墨烯/钨酸铋（rGO/BiWO）。利用各种分析工具对所制备的催化剂进行了表征。在太阳光存在的情况下，对亚甲基蓝（MB）和罗丹明B（RhB）染料进行氧化，以评估rGO/BiWO组合的光催化活性。此外，还测试了光电化学（PEC）水分解，这是一种利用太阳能从水中高效且经济地制氢的方法。研究了BiWO的煅烧温度和氧化石墨烯用量对催化活性的影响。暴露30分钟后，在700℃煅烧的合成样品10rGBW（10rGBW-IV）对MB和RhB染料分别显示出100.0%和87.6%的良好光降解率。此外，与BiWO相比，rGO/BiWO的光电流响应强度更大，电化学阻抗的弧半径更小，这揭示了对BiWO可见光响应性的协同效应。根据莫特-肖特基曲线，10rGBW-IV显示出费米能级更大的负向偏移（FB = -0.08 V RHE），表明水分解的氧化电位更强。
