Perutil Jil Rose, Francis Mathew K, Verma Manish, John Neena S
Centre for Nano and Soft Matter Sciences (CeNS) Shivanapura Bengaluru 562162 India
Manipal Academy of Higher Education Manipal 576104 India.
RSC Adv. 2025 Aug 20;15(36):29439-29452. doi: 10.1039/d5ra04077a. eCollection 2025 Aug 18.
A cerium vanadate-bismuth vanadate (CV-BV) composite is developed to facilitate dual functionality in photocatalytic hydrogen generation and degradation and is synthesized a one pot hydrothermal method. Despite its strong pollutant degradation capability, BV remains ineffective for hydrogen evolution, whereas CV, with favourable band position, actively participates in hydrogen evolution. BV shows a pollutant degradation rate of 90% in 1 hour but does not produce hydrogen, while CV exhibits a hydrogen evolution rate of 590.0 μmol h g but only a 10% degradation of methyl orange (MO) for the same duration. Notably, the CV-BV heterojunction, governed by an S-scheme mechanism that favours charge carrier separation and redox potential, exhibits excellent performance, simultaneously achieving a hydrogen evolution rate of 1011 μmol h g and a 98% degradation efficiency for MO. The total organic carbon analysis indicates 93% removal of organic carbon from the dye solution. The system maintains stable catalytic performance over five consecutive cycles, indicating its durability. The solar-to-hydrogen (STH) efficiency for the CV-BV system is determined to be 3.99%. The activity of the CV-BV catalyst is demonstrated in actual wastewater, achieving 96% dye degradation and 803.0 μmol h g hydrogen generation. Its dual performance remained effective even in MO-contaminated seawater (310.0 μmol h g and 98% MO degradation), proving its adaptability to harsh, complex environments. The heterojunction efficiently absorbs a broad light spectrum, generating electron-hole pairs, and conduction band electrons of CV participate in proton reduction to produce hydrogen in the presence of a hole scavenger while superoxide radicals partake in degradation as proven from the radical trapping experiments. The synergistic S-scheme charge transfer mechanism within the CV-BV system enhances its bifunctional efficiency, demonstrating significant potential for fuel generation from wastewater with simultaneous environmental remediation.
开发了一种钒酸铈 - 钒酸铋（CV - BV）复合材料，以实现光催化产氢和降解的双重功能，并通过一锅水热法合成。尽管BV具有很强的污染物降解能力，但对于析氢仍然无效，而具有有利能带位置的CV则积极参与析氢过程。BV在1小时内显示出90%的污染物降解率，但不产生氢气，而CV在相同时间内的析氢速率为590.0 μmol h g，但甲基橙（MO）的降解率仅为10%。值得注意的是，由有利于电荷载流子分离和氧化还原电位的S型机制控制的CV - BV异质结表现出优异的性能，同时实现了1011 μmol h g的析氢速率和98%的MO降解效率。总有机碳分析表明，染料溶液中的有机碳去除率为93%。该系统在连续五个循环中保持稳定的催化性能，表明其耐久性。CV - BV系统的太阳能到氢能（STH）效率确定为3.99%。CV - BV催化剂在实际废水中表现出活性，实现了96%的染料降解和803.0 μmol h g的产氢量。即使在受MO污染的海水中，其双重性能仍然有效（310.0 μmol h g和98%的MO降解），证明了其对恶劣、复杂环境的适应性。异质结有效地吸收宽光谱，产生电子 - 空穴对，CV的导带电子在有空穴清除剂存在的情况下参与质子还原以产生氢气，而过氧自由基参与降解，这已通过自由基捕获实验得到证实。CV - BV系统内的协同S型电荷转移机制提高了其双功能效率，显示出从废水同时进行环境修复来产生燃料的巨大潜力。
