Photochemical Decomposition of Hydrogen Sulfide

Abstract

Hydroμen sulλide is an extremely toxic μas which is μenerated λrom both nature λactors and human λactors. " proper method λor the eλλicient decomposition oλ hydroμen is oλ μreat importance. Usinμ traditional Claus process, hydroμen sulλide could be decomposed into hydroμen oxide and sulλur. One drawback oλ this process is that the enerμy stored in hydroμen sulλide is partially wasted by the λormation oλ hydroμen oxide. In λact, the enerμy could be utilized λor the μeneration oλ hydroμen, a potential enerμy source in λuture, or other chemical products. Various methods that could possibly make better use oλ hydroμen sulλide have been studied in recent years, like thermal decomposition, plasma method, electrochemical method, and photochemical method. In particular, there have been hiμh hopes in photochemical method due to the possible direct solar enerμy conversion into chemical enerμy. Unlike traditional photocatalytic water splittinμ, hydroμen sulλide decomposition is more accessible λrom the thermodynamic point oλ view. Photocatalytic hydroμen sulλide decomposition could occur in both μas phase and solution phase and various systems have been reported. "esides, the photoelectrochemical decomposition oλ hydroμen sulλide is also hiμhliμhted. In this chapter, we will simply introduce the current situation λor photochemical decomposition oλ hydroμen sulλide.

Perspectives in the Synergetic Photothermocatalysis of Hydrogen Sulfide Decomposition for Hydrogen Production: A Comprehensive Review

“…However, if the electrons and holes are successful in reaching the catalyst surface, they can be involved in oxidation and reduction reactions as in eq 25. 112 + Y Y (reduction), X X (oxidation)…”

Engineering of Solar Energy Harvesting Tb3+-Ion-Doped CdS Quantum Dot Glasses for Photodissociation of Hydrogen Sulfide

“…12,13 Currently, researchers have focused on developing photocatalysts and cocatalysts capable of reducing the dissociation energy of H 2 S to increase H 2 yield using UV-light sources, i.e., 300−450 nm. 14 It is possible to utilize the abundant solar radiation for photocatalytic reactions to convert toxic pollutants such as H 2 S to clean energy (H 2 ). 7 Searching for appropriate photocatalysts is still challenging because photocatalytic efficiency is limited due to the band gap distribution of electronic states.…”

“…The water-splitting reaction requires 285.83 kJ/mol; by comparison, the H 2 S decomposition reaction required much less energy, i.e., 79.9 kJ/mol for producing the same volume of H 2 gas . Growing concerns about the environment and resource utilization have pushed the research for novel methodologies to convert H 2 S into S and H 2 as green fuel using solar energy. , Currently, researchers have focused on developing photocatalysts and cocatalysts capable of reducing the dissociation energy of H 2 S to increase H 2 yield using UV-light sources, i.e., 300–450 nm …”

“… 12 , 13 Currently, researchers have focused on developing photocatalysts and cocatalysts capable of reducing the dissociation energy of H 2 S to increase H 2 yield using UV-light sources, i.e., 300–450 nm. 14 …”

Influence of Mg, Cu, and Ni Dopants on Amorphous TiO2 Thin Films Photocatalytic Activity

“…TiO 2 manufacturing is affordable, which makes it economically favorable, especially when compared with materials having similar properties, such as SnO 2 , CeO 2 , CdS, and WO 3 . These semiconductors are also used for photocatalysis research because of their biocompatibility, stability in various conditions, and capability to generate excitons [8,9]. TiO 2 achieves better photocatalytic activity than ZnO [10] or CdS [11] and under the same conditions; not only does it have better photochemical stability, but TiO 2 is superior photocatalyst compared to WO 3 [12].…”