A review on arsenic removal from coal combustion: Advances, challenges and opportunities

Wang, Yan; Yu, Jianglong; Wang, Zhihua; Liu, Yangxian; Zhao, Yongchun

doi:10.1016/j.cej.2021.128785

Cited by 73 publications

(25 citation statements)

References 122 publications

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“…This indicated that NO and SO 2 in flue gas could be transformed into nitrate and sulfate under the catalysis of Fe 2 O 3 . , Based on this fact, some valuable conclusions could be gained. The formed sulfate occupied the active sites on the surface of the adsorbent and further limited the fixation of arsenic, while the generated nitrate possessed oxidizability and could facilitate the transformation of As(III) in flue gas to As(V), which explained why NO promoted arsenic capture at 1000 °C, as shown in Figure . In addition, there were two other points that are worthy of attention including the following: (i) the impact of SO 2 was significantly stronger than that of NO.…”

Section: Resultsmentioning

confidence: 99%

In-Furnace Control of Arsenic Vapor Emissions Using Fe₂O₃ Microspheres with Good Sintering Resistance

Song

Yuan

Wei

et al. 2021

Environ. Sci. Technol.

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The addition of Fe2O3 into furnaces is a promising method for arsenic pollution control. Nevertheless, Fe2O3 particles undergo serious sintering under actual furnace temperatures. To improve its sintering resistance, Fe2O3 hollow microspheres were synthesized by the template method and were tested in flue gas containing SO2 and NO in the range of 1000–1300 °C. The results demonstrated that the amount of arsenic captured could be steadily maintained above 5 mg/g throughout the operating temperature range, and Fe2O3 microspheres could maintain the originally developed pore structure and hollow morphology well even at 1200 °C. Based on product analysis and density functional theory calculations, the fixation pathway of arsenic was proposed. In no oxygen conditions, As2O3 was first bound to the Fe2O3 surface by forming an −O–As–O–Fe stable structure and then was oxidized by lattice oxygen. The introduction of O2 could regenerate the consumed lattice oxygen and therefore promote arsenic capture. Finally, the oxidized arsenic was fixed in products in the form of FeAsO4. Additionally, the impact of acid gases was also investigated. SO2 showed a notable inhibiting effect on arsenic capture, while the impact of NO was less noticeable.

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Section: Resultsmentioning

confidence: 99%

In-Furnace Control of Arsenic Vapor Emissions Using Fe₂O₃ Microspheres with Good Sintering Resistance

Song

Yuan

Wei

et al. 2021

Environ. Sci. Technol.

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“…Therefore, the removal of arsenic from groundwaters, even in cases where is used only for agriculture, is of vital importance. Several removal technologies [11,12] have been developed for water treatment in centralized plants, using iron coagulation-filtration and adsorption onto iron oxy-hydroxides being the most widely practiced technique [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

2022

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The present review article summarizes the recent findings reported in the literature with regard to the use of molecularly imprinted polymers for the removal of arsenic from water and wastewater. MIPs are polymers in which a template is employed in order to enable the formation of recognition sites during the covalent assembly of the bulk phase, via a polymerization or polycondensation process. The efficiency of both arsenic species and the mechanism of removal are highlighted. The results have shown that under certain conditions, MIPs demonstrated arsenic sorption capacities of up to 130 mg/g for As(V) and 151 mg/g for As(III), while the regeneration ability was found to reach up to more than 20 cycles. The overall results showed that further development of MIPs could result in the formation of promising adsorbents for arsenic removal from waters. The use of MIPs for the removal not only of arsenic but also other inorganic contaminants is considered a very important topic, with great potential in terms of future applications in water treatment. The main advantage of these materials is that they are very selective toward the contaminant of interest. This enhanced selectivity is attributed to the incorporation of specific templates, which can then adsorb the contaminant of interest almost exclusively. Therefore, the main problem in adsorption processes is the competition for adsorption sites by other water components, for example, phosphates, nitrates, carbonates, and sulfates, which can be circumvented by the use of MI-type adsorbents.

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“…Mercury is a recognized highly toxic substance, which can cause a series of hazards to human body, such as carcinogenesis and teratogenesis. − The emission of gaseous mercury from the combustion process of multifarious fuels is considered to be one of the major emission sources of anthropogenic atmospheric mercury. − In order to reduce the potential threat of mercury emissions to human beings, a large number of researchers strive to develop a variety of gaseous mercury purification and separation technologies. − Mercury from the combustion flue gas of fossil fuels is generally divided into three kinds, Hg 0 (elemental mercury), Hg 2+ (divalent or oxidized mercury), and Hg p (particulate mercury), based on their existing forms in flue gas. − At present, wet flue gas desulphurization device and selective catalytic reduction denitration device are installed widely in coal-fired boilers to treat the sulfur dioxide, nitrogen oxides, and other heavy metal pollutants. − The former can effectively remove Hg 2+ , while the latter can remove Hg p well. However, these existing desulfurization and denitration devices are difficult to effectively remove Hg 0 because of the unique properties of Hg 0 , such as low water solubility, high volatility, and low reaction activity with fly ash. − Therefore, exploring and developing efficient oxidation technologies that are suitable for Hg 0 in flue gas are an important development direction in this field.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Absorption of Hg⁰ in the Gas Phase Using a Double Catalyzers–Double Oxidants Coactivation Technology

Wang

Liu

2022

Energy Fuels

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An oxidation absorption technology of Hg0 in the gas phase using double metal catalyzers–double oxidants coactivation was developed. Several experiments were performed to study the main influencing factors, key reactive species, oxidation products, and mechanism of Hg0 oxidation absorption. It was found that higher concentration of Fe2+ and Cu2+ led to an increase in Hg0 removal efficiency. The removal efficiency of Hg0 was declined through increasing the reagent pH value, flue gas flow rate, Hg0 inlet concentration, and inlet content of NO/SO2. Changing the removal temperature and concentrations of PMS (peroxymonosulfate) and H2O2 resulted in a dual influence on Hg0 oxidation absorption. Under the optimized experimental conditions, the maximum removal efficiency of Hg0 is up to 97.5%. Due to the significant synergistic activation effect, bigger reactive species yield and higher Hg0 removal efficiency were obtained in the double metal catalyzers–double oxidants coactivation system than those in the other contrasted systems, which were caused by the redox cycling by double metal catalyzers and the free radical capture intermediate formed between double oxidants. The Hg0 oxidation absorption was mainly achieved by the oxidation of •OH and SO4 –•, and Hg2+ was confirmed to be the main products of Hg0 oxidation absorption in the developed coactivation system.

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A review on arsenic removal from coal combustion: Advances, challenges and opportunities

Cited by 73 publications

References 122 publications

In-Furnace Control of Arsenic Vapor Emissions Using Fe₂O₃ Microspheres with Good Sintering Resistance

In-Furnace Control of Arsenic Vapor Emissions Using Fe₂O₃ Microspheres with Good Sintering Resistance

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

Oxidation Absorption of Hg⁰ in the Gas Phase Using a Double Catalyzers–Double Oxidants Coactivation Technology

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A review on arsenic removal from coal combustion: Advances, challenges and opportunities

Cited by 73 publications

References 122 publications

In-Furnace Control of Arsenic Vapor Emissions Using Fe2O3 Microspheres with Good Sintering Resistance

In-Furnace Control of Arsenic Vapor Emissions Using Fe2O3 Microspheres with Good Sintering Resistance

Arsenic(III) and Arsenic(V) Removal from Water Sources by Molecularly Imprinted Polymers (MIPs): A Mini Review of Recent Developments

Oxidation Absorption of Hg0 in the Gas Phase Using a Double Catalyzers–Double Oxidants Coactivation Technology

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In-Furnace Control of Arsenic Vapor Emissions Using Fe₂O₃ Microspheres with Good Sintering Resistance

In-Furnace Control of Arsenic Vapor Emissions Using Fe₂O₃ Microspheres with Good Sintering Resistance

Oxidation Absorption of Hg⁰ in the Gas Phase Using a Double Catalyzers–Double Oxidants Coactivation Technology