Removal of hydrogen sulfide from biogas by adsorption and photocatalysis: a review

Fonseca-Bermúdez, Óscar Javier; Giraldo, Liliana; Sierra, R.; Moreno–Piraján, Juan Carlos

doi:10.1007/s10311-022-01549-z

Cited by 6 publications

(3 citation statements)

References 66 publications

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“…Cu 2−x Se/CdS was used to treat 10 mg/L RhB, only approximately 20% could be treated in 30 min, and the rate of low-concentration pollutants was not effective [20], the catalytic active sites on the surface of pure photocatalytic materials are not fully utilized and cannot reach the optimal degradation state, the photocatalytic materials and adsorbent materials are combined, and the abundant adsorption active sites of the adsorbent materials provide a large mass transfer rate for the catalytic active sites. After the catalytic active sites degrade the pollutants, the adsorption active sites are vacated to continue to adsorb and degrade the pollutant molecules, and the synergistic impact of the two promotes the photocatalytic reaction rate, which has been proven by many scholars to promote photocatalytic performance [21][22][23]. Activated carbon (AC) is a material with a high surface area and porosity (usually 900-1200 m 2 /g), and its use as a carrier for different photocatalytic materials can provide more active adsorption sites for photocatalysts [24] and higher carrier mobility [25] as well as a wider light absorption range [26].…”

Section: Introductionmentioning

confidence: 99%

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

Yuan,

Cui,

Zhang

2024

Water

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Low-concentration antibiotic wastewater is difficult to treat rapidly using conventional photocatalysts. For this reason, this paper simplified the traditional sol–gel method to prepare Fe3+-TiO2/AC composites and characterized the properties of the composites using FT-IR, XRD, SEM, BET, and TEM. The results demonstrated that iron was uniformly dispersed on the surface of the composites, and the activated carbon (AC) was successfully loaded with iron-doped titanium dioxide. Afterward, ciprofloxacin (CIP) was used as the target degradant, and the effects of different activated carbon loadings, iron-doping, pH, initial concentrations, and UV light intensities on the removal of ciprofloxacin were investigated. The repetitive photocatalytic stability of the composites was studied, and the reaction mechanism was explored by using free radical quenching experiments. The results demonstrated that while iron doping reduced the rate at which photogenerated electrons and holes could combine, loading AC increased the usage efficiency of the composites’ adsorption and catalytic active sites. According to the parameter tests, the circumstances that led to the highest CIP degradation efficiency (94.59%) were as follows: 10 mg/L CIP, 0.5 g/L 0.2%Fe3+-TiO2/20%AC, and solution pH of 7 under 40 min of UV light irradiation. In addition, the Fe3+-TiO2/AC composite material has excellent cyclic stability, the degradation rate of CIP can still reach 87.73% at 60 min after four repeated degradation tests under the same conditions. The applicability of this method could be expanded to the treatment of various industrial organic pollutants in water.

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Section: Introductionmentioning

confidence: 99%

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

Yuan,

Cui,

Zhang

2024

Water

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“…The commonly methods for H 2 S removal include absorption, adsorption, catalytic oxidation, and biological method. 3,4 Among the above methods, the absorption method has been widely used for gas desulfurization due to its ability to operate under high sulfur load conditions. 5,6 However, traditional absorbents (aqueous solution) have drawbacks such as high volatility and low applicable temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen sulfide (H 2 S) is a highly toxic gas, which can cause significant harm to the ecological environment, human health, and industrial production. , The removal of H 2 S is of great significance for environmental protection. The commonly methods for H 2 S removal include absorption, adsorption, catalytic oxidation, and biological method. , Among the above methods, the absorption method has been widely used for gas desulfurization due to its ability to operate under high sulfur load conditions. , However, traditional absorbents (aqueous solution) have drawbacks such as high volatility and low applicable temperature . In recent years, the development of new solvents has received widespread attention from researchers.…”

Section: Introductionmentioning

confidence: 99%

Study on Desulfurization and Regeneration Performance of Nanofluid System Based on Heteropoly Compound/Ionic Liquid Solutions

Liu,

Deng,

Niu

et al. 2024

Ind. Eng. Chem. Res.

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Heteropoly compounds were dissolved in ionic liquids to obtain heteropoly compound/ionic liquid solutions. SiO 2 nanoparticles with different mass ratios were introduced into the solutions described above to obtain nanofluids. The desulfurization and regeneration performances of the nanofluids have been explored by dynamic H 2 S absorption experiments. The results showed that the optimal ratio of SiO 2 nanoparticles was confirmed to be 0.05% at 150 °C and the desulfurization efficiency of the nanofluid remained above 97% at 480 min. The nanofluids exhibited lower desulfurization performance at 100 °C than that at 150 °C. It is noteworthy that heteropoly blue has a self-catalytic effect on the absorption process of H 2 S. The results of characterizations revealed that SiO 2 nanoparticles in the nanofluids were covered by heteropoly compounds and sulfur. The morphology of SiO 2 nanoparticles showed no significant change in the absorption−regeneration process. The nanofluids had stable and high desulfurization performance at high temperature and could be regenerated by air easily.

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A critical review of biochar versus hydrochar and their application for H2S removal from biogas

Vuppaladadiyam,

Jena,

Hakeem

et al. 2024

Rev Environ Sci Biotechnol

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Biogas contains significant quantities of undesirable and toxic compounds, such as hydrogen sulfide (H2S), posing severe concerns when used in energy production-related applications. Therefore, biogas needs to be upgraded by removing H2S to increase their bioenergy application attractiveness and lower negative environmental impacts. Commercially available biogas upgradation processes can be expensive for small and medium-scale biogas production plants, such as wastewater treatment facilities via anaerobic digestion process. In addition, an all-inclusive review detailing a comparison of biochar and hydrochar for H2S removal is currently unavailable. Therefore, the current study aimed to critically and systematically review the application of biochar/hydrochar for H2S removal from biogas. To achieve this, the first part of the review critically discussed the production technologies and properties of biochar vs. hydrochar. In addition, exisiting technologies for H2S removal and adsorption mechanisms, namely physical adsorption, reactive adsorption, and chemisorption, responsible for H2S removal with char materials were discussed. Also, the factors, including feedstock type, activation strategies, reaction temperature, moisture content, and other process parameters that could influence the adsorption behaviour are critically summarised. Finally, synergy and trade-offs between char and biogas production sectors and the techno-economic feasibility of using char for the adsorption of H2S are presented. Biochar’s excellent structural properties coupled with alkaline pH and high metal content, facilitate physisorption and chemisorption as pathways for H2S removal. In the case of hydrochar, H2S removal occurs mainly via chemisorption, which can be attributed to well-preserved surface functional groups. Challenges of using biochar/hydrochar as commercial adsorbents for H2S removal from biogas stream were highlighted and perspectives for future research were provided. Graphical abstract

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Removal of hydrogen sulfide from biogas by adsorption and photocatalysis: a review

Cited by 6 publications

References 66 publications

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

Study on Desulfurization and Regeneration Performance of Nanofluid System Based on Heteropoly Compound/Ionic Liquid Solutions

A critical review of biochar versus hydrochar and their application for H2S removal from biogas

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