Internal Electric Field Assisted Photocatalytic Generation of Hydrogen Peroxide over BiOCl with HCOOH

Abstract

Hydrogen peroxide (H 2 O 2 ) is a superb, clean, and versatile reagent. However, large-scale production of H 2 O 2 is manufactured through nongreen methods that motivate people to develop more efficient and green technologies as alternatives. As a novel and green technology used for H 2 O 2 generation, the efficiency of photocatalysis is still far from satisfactory. Here, we demonstrate a novel and efficient path of the generation of H 2 O 2 in BiOCl photocatalysis but not the direct electron reduction of O 2 or hole oxidation of OH − to H 2 O 2 . Super high production (685 μmol/h) of H 2 O 2 by the addition of HCOOH as the hole shuttle was realized over BiOCl nanoplates. In this photocatalytic system, the BiOCl supplied abundant photoinduced holes to initiate HCOO • radical. The HCOO • further reacts with OH − to •OH which is proven to be the source of the H 2 O 2 . Apart from HCOOH, O 2 also played important roles. The O 2 not only promoted the reaction through the cycle between Bi 3+ and Bi, which decreased the combination of carriers, but also avoided the carbonation of surfaces, thus achieving the high production of H 2 O 2 (1020 μmol/h). In this work, we shed light on a deep understanding of the photocatalytic evolution of H 2 O 2 in a novel perspective and achieve high production.

Oxygen-vacancy-rich BiOCl materials with ultrahigh photocatalytic efficiency by etching bismuth glass

“…Among these ions, superoxide radicals (cO 2 À ) and hydroxyl radicals (cOH) can realize the effective neutralization of organic pollutants, such as rhodamine B, which could be applied to alleviate environmental pollution. [10][11][12] The existing current research suggests that there are three effective strategies for the fabrication of BiOCl materials with high catalytic performance: 3,5,6 crystal facet tailoring, 3D hierarchical structure control, and evolution of the band gap.…”

“…Among these ions, superoxide radicals (˙O 2 − ) and hydroxyl radicals (˙OH) can realize the effective neutralization of organic pollutants, such as rhodamine B, which could be applied to alleviate environmental pollution. 10–12 …”

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

“…To decrease the expense of waste treatment through cost-effective strategies, various methods based on the exploitation of sunlight have been proposed for both solid and liquid waste management [6]. Among these, photocatalysis is a remarkable technique with a variety of applications, including the debasement of different contaminations in wastewater [7], antibacterial functions [8], cleansing of air [9], and generation of hydrogen [10]. The photocatalytic procedure is attracting more focus in the field of ecological and environmental safety, as there is a need to achieve the utmost degradation of contaminants attainable under states of mild pressure and temperature.…”

Recent Strategies for Hydrogen Peroxide Production by Metal-Free Carbon Nitride Photocatalysts

“…Metal-metal oxide hybrid catalysts have also been widely studied as promising candidates in the context of photocatalytic production of H 2 O 2 , owing to their high chemical stability and low toxicity [60][61][62][63]. Among all the metal elements, Ru, Bi, Co, and Cd are the most commonly combined with optical semiconductors, such as TiO 2 (the standard photocatalyst) [36,[64][65][66][67][68][69][70][71]. Despite their high efficiency for several photocatalytic applications, metal catalysts present viability problems and poor sustainability due to their high cost, difficulty of extraction from their ores, and possibility of leaching, which can contaminate the reaction medium and lead to the generation of hazardous wastes [72][73][74][75].…”