Molten salt shielded preparation of rice straw biochars doped by copper sulfide for elemental mercury capture

Liu, Dongjing; Yang, Lingtao; Wu, Jiang; Li, Bin

doi:10.1016/j.joei.2022.03.005

Cited by 20 publications

(6 citation statements)

References 55 publications

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“…This decreases the NO 3 − adsorption sites in the PRB column, which is not conducive to the removal of NO 3 − from groundwater using the pristine and modified biochar materials (Yan et al, 2020). In contrast, the biochar materials involving smaller particles are characterized by higher specific surface areas and total pore volumes, which facilitate the penetration of NO 3 − into structure, and thereby produces high adsorption capacities (Liu D. et al, 2022). However, if the particle sizes of the biochar material are very fine, the porosity and permeability of the PRB column are reduced, and these changes decrease the NO 3 − adsorption capacity (Haque et al, 2021).…”

Section: Effect Of the Particle Size Of The Filler On No 3 − Removalmentioning

confidence: 99%

Remediation of nitrate contaminated groundwater using a simulated PRB system with an La–CTAC–modified biochar filler

Wu²,

Nie³

et al. 2022

Front. Environ. Sci.

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In the present study, the Erigeron canadensis L., a typical invasive plant in Southwest China, was utilized as the raw material to prepare original biochar (ECL), a rare earth element La–modified biochar (La–ECL), and a rare earth element La coupling cationic surfactant [cetyltrimethylammonium chloride (CTAC)]–modified biochar (La/CTAC–ECL). These materials were then added to simulated permeable reactive barriers (PRBs) and their nitrate (NO3−) contaminant remediation performances were evaluated in groundwater. The results show that the breakthrough time for NO3− in a simulated PRB column increases as the concentration of the influent NO3− and the flow rate decreases, whereas with the increases of filler particle size and the height of the filler in the column initially increases, and then decreases. Considering an initial NO3− concentration of 50 mg L−1, and a filler particle size range of 0.8–1.2 mm, the maximum adsorption capacity of the La/CTAC–ECL column for NO3− is 18.99 mg g−1 for a filler column height of 10 cm and an influent flow rate of 15 ml min−1. The maximum quantity of adsorbed NO3− of 372.80 mg is obtained using a filler column height of 15 cm and an influent flow rate of 10 ml min−1. The Thomas and Yoon–Nelson models accurately predict the breakthrough of NO3− in groundwater in the simulated PRB column under different conditions, and the results are consistent with those from dynamic NO3− adsorption experiments. TEM, XRD, FTIR, and XPS analyses demonstrate that the modification using the La and CTAC improves the surface structure, porosity, permeability, and configuration of functional groups of the biochar. The mechanisms of NO3− removal from groundwater using the La/CTAC–ECL include pore filling, surface adsorption, ion exchange, and electrostatic adsorption. The composite La/CTAC–ECL exhibits a superior potential for the remediation of NO3− contaminated groundwater.

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Section: Effect Of the Particle Size Of The Filler On No 3 − Removalmentioning

confidence: 99%

Remediation of nitrate contaminated groundwater using a simulated PRB system with an La–CTAC–modified biochar filler

Wu²,

Nie³

et al. 2022

Front. Environ. Sci.

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“…In particular, chitin and protein waste can produce N-doped porous carbons without adding extra nitrogen precursors. And the hierarchical N-doped porous carbon materials with large specific surface areas exhibit high performance in adsorption 115,[121][122][123][124] and catalytic degradation (e.g., peroxydisulfate activation) 116,120 of environmental pollutants. Moreover, heteroatom-doped hierarchical porous carbon materials show a high potential for energy storage (e.g., supercapacitor).…”

Section: Molten Salt-assisted Synthesis Of Diverse Biomass-derived Ca...mentioning

confidence: 99%

Research advancement in molten salt-mediated thermochemical upcycling of biomass waste

Shen

Yuan

2023

Green Chem.

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“…10CuS/MWCNTs displayed optimal mercury capture performance at 70 °C with a Hg 0 removal efficiency of 85.8%. To reduce the cost of sorbent, CuS was loaded onto a biochar derived from thermal pyrolysis of rice straw in an eutectic salt . Full mercury capture was obtained over 5CuS/biochar within 60–100 °C.…”

Section: Copper Sulfide (Cus)mentioning

confidence: 99%

“…To reduce the cost of sorbent, CuS was loaded onto a biochar derived from thermal pyrolysis of rice straw in an eutectic salt. 130 Full mercury capture was obtained over 5CuS/ biochar within 60−100 °C. NO slightly decreased mercury removal, while SO 2 displayed an indistinct impact on mercury capture.…”

Section: Doped Cusmentioning

confidence: 99%

Copper-Based Sorbents and Catalysts for Elemental Mercury Removal from Gas Stream: A Review

Liu

2023

Ind. Eng. Chem. Res.

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Mercury emission has become a global concern due to the potential risks Hg poses to human health and the environment. Currently, copper-based compounds, such as CuCl 2 , CuO, CuS, and CuSe, have attracted great attention in mercury emission control, because of their low cost and decent removal efficiency. This review provides an overview of the recent progress on adsorptive and catalytic oxidation removal of elemental mercury over copper-based composites. Supported CuCl 2 can majorly serve as an inexpensive and efficient catalyst toward Hg 0 oxidation. Nevertheless, the high volatility and water solubility of mercury chloride may cause halogen release and a potential leaching risk of mercury, respectively. Due to its superior redox property, CuO is fairly active in Hg 0 oxidation. Metal incorporation can distinctly strengthen the mercury removal performance. However, CuO-based composites can be easily poisoned or suppressed by flue gas constituents owing to the generation of inactive copper sulfates/nitrates or competitive adsorption. CuS-based composites appear to be the most promising sorbents for mercury capture, because of strong Hg 0 affinities and remarkable tolerances to steam and sulfur dioxide. CuSe-based composites show mercury capture performances similar to those of CuS-based composites. However, tedious synthetic processes and expensive Se precursors hinder their industrial implementation.

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Molten salt shielded preparation of rice straw biochars doped by copper sulfide for elemental mercury capture

Cited by 20 publications

References 55 publications

Remediation of nitrate contaminated groundwater using a simulated PRB system with an La–CTAC–modified biochar filler

Remediation of nitrate contaminated groundwater using a simulated PRB system with an La–CTAC–modified biochar filler

Research advancement in molten salt-mediated thermochemical upcycling of biomass waste

Copper-Based Sorbents and Catalysts for Elemental Mercury Removal from Gas Stream: A Review

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