Mercury removal by the S2Cl2 modified biomass coke with mechanochemical versus impregnation method

Zhao, Shilin; Luo, Hui; Ma, Anjun; Xie, Wen; Sun, Kang; Sun, Zhiqiang

doi:10.1016/j.cej.2022.135073

Cited by 18 publications

(4 citation statements)

References 52 publications

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“…The results showed that C-SAA was completely modified when the mass fraction of oxalic acid was 2%, and the adsorption capacity was about 180.42 mg/g. Considering the amount of oxalic acid and its modification effect, an oxalic acid solution with a mass fraction of 2% can be considered as a chemical impregnation modifier (Zhao et al, 2022) for modified C-SAA, which is referred to as C-SAAoa in this paper (as the nomenclature in 2.2 and 2.3).…”

Section: Effect Of Calcination Temperature and Oxalic Acidmentioning

confidence: 99%

Study on Waste Acid Modificated Industrial Solid Waste Aluminum Ash to Prepare Environmental Functional Materials to Remove Fluoride Ions in Wastewater

Ren

Chen

et al. 2022

Front. Environ. Sci.

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C-SAAoa particles synthesized by simple and low-cost calcining industrial solid waste aluminium ash combined with waste oxalic acid modification process show excellent performance in fluoride removal speed and adsorption capacity. Their adsorption capacity on fluoride was determined at about 180.57 mg/g at pH 3.0, which was among the highest reported values in the literature. It was determined that the adsorption mechanism of fluoride on C-SAAoa particles followed mechanisms such as ion exchange, electrostatic action, and the surface - OH groups played a major role in the fluoride removal process. C-SAAoa particles can effectively remove fluoride, even in the presence of a certain concentration of competing anions. At the same time, the material possesses good cycling performance, and can still maintain 78.9% of the initial adsorption capacity in the longitudinal for eight recycles. Therefore, it may have the potential to become a promising adsorbent as a supplement to industrial solid waste resource-based utilization processes and also for fluoride removal in small-scale treatment facilities or wastewater with high fluoride concentrations.

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Section: Effect Of Calcination Temperature and Oxalic Acidmentioning

confidence: 99%

Study on Waste Acid Modificated Industrial Solid Waste Aluminum Ash to Prepare Environmental Functional Materials to Remove Fluoride Ions in Wastewater

Ren

Chen

et al. 2022

Front. Environ. Sci.

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“…Biochar has an ideal large specific surface area, rich pore structure, strong thermal stability, and great potential to replace industrial activated carbon. − Sulfur-containing substances are usually used for the modification of adsorbents because sulfur can provide a pair of lone electrons to form a covalent bond with mercury during the reaction process, and sulfur shows a strong affinity for mercury . Zhao et al used wood chips as biomass raw materials and selected sulfur-containing substances as modifiers.…”

Section: Introductionmentioning

confidence: 99%

Elemental Mercury Removal from Coal-Fired Flue Gas on Sulfur-Modified Activated Biomass Coke: Experiment and Simulation

Zeng

Wang

Kang

et al. 2023

Ind. Eng. Chem. Res.

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It is necessary to find a better method to remove mercury from coal-fired flue gas. This work proposes the use of corn stalk coke to remove mercury from coal-fired flue gas and through elemental sulfur (CSC-S), water vapor activation (CSC-H 2 O), and sulfur modification combined with water vapor activation (CSC-H 2 O-S) to prepare three different adsorbents. The mercury removal performance of the adsorbents prepared by different methods was evaluated on a small fixed-bed mercury removal experimental platform. The experimental results showed that the order of mercury removal efficiency of the four adsorbents was: CSC-H 2 O-S > CSC-S > CSC-H 2 O > CSC. Brunauer−Emmett−Teller (BET), Fourier transform infrared (FTIR) spectroscopy, and Xray photoelectron spectroscopy (XPS) were adopted to study the physical and chemical properties of the adsorbent surface and the mechanism of mercury removal. The results showed that water vapor activation can improve the pore structure of the adsorbent, increase its specific surface area, and generate new oxygen-containing functional groups on the surface of the adsorbent. The adsorption kinetic model further demonstrated that the water vapor activation process can improve the physical adsorption performance of corn stalk char, and the sulfur modification process can improve the chemical adsorption performance of corn stalk char. Quantum chemical studies have shown that the surface structure doped with S and O atoms is conducive to enhancing the adsorption of Hg 0 .

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“…Mercury in coal combustion flue gas was present in different forms including oxidized mercury (Hg 2+ ), particulate mercury (Hg p ), and elemental mercury (Hg 0 ). − The oxidized form of mercury can be dissolved in liquids and can be removed with the help of wet denitrification or wet desulfurization units (WFGD), while the particulate form of mercury could be mostly removed by dust collectors. ,, Elemental mercury was thermodynamically stabilized. It is challenging to remove elemental mercury industrially, and it is usually removed by oxidation to higher valence states by various adsorbents or catalysts .…”

Section: Introductionmentioning

confidence: 99%

Insight into the Mercury Removal Mechanism of Copper Salt-Modified Biomass Coke in an Oxyfuel Combustion Atmosphere

et al. 2023

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The development of effective sorbents using biomass is important to achieve mercury removal in coal combustion flue gas. In this work, a biomass sorbent was prepared by using rice husk as a raw material and CuCl2 solution as a modifier. The experiment explored the mercury removal ability of rice husk with different modification solution concentrations. The sorbent showed the best mercury removal capacity with 0.15 mol/L CuCl2 solution modified rice husk coke at an inlet mercury concentration of 54.4 μg/m3 at 150 °C. It was found that the modification made CuCl2 adhere to the surface of the coke sample successfully and chlorine-containing functional groups and copper-containing functional groups in the coke sample both promoted the adsorption of mercury. The increase in chemisorbed oxygen due to the modification also promoted the sorbent removal of mercury. The increase of adsorption temperature and inlet mercury concentration was beneficial to mercury removal, but too high temperature had a negative effect on its mercury removal. The purpose of this work is to explore a novel approach for the efficient use of this agricultural waste, apply it to mercury removal in oxyfuel coal-fired power plants, and provide technical support and theoretical guidance for its application in industry.

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Mercury removal by the S2Cl2 modified biomass coke with mechanochemical versus impregnation method

Cited by 18 publications

References 52 publications

Study on Waste Acid Modificated Industrial Solid Waste Aluminum Ash to Prepare Environmental Functional Materials to Remove Fluoride Ions in Wastewater

Study on Waste Acid Modificated Industrial Solid Waste Aluminum Ash to Prepare Environmental Functional Materials to Remove Fluoride Ions in Wastewater

Elemental Mercury Removal from Coal-Fired Flue Gas on Sulfur-Modified Activated Biomass Coke: Experiment and Simulation

Insight into the Mercury Removal Mechanism of Copper Salt-Modified Biomass Coke in an Oxyfuel Combustion Atmosphere

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