Mercury removal and synergistic capture of SO2/NO by ammonium halides modified rice husk char

Zhu, Chun; Duan, Yufeng; Wu, Chang‐Yu; Zhou, Qiang; She, Min; Yao, Ting; Zhang, Jun

doi:10.1016/j.fuel.2015.12.061

Cited by 83 publications

(30 citation statements)

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“…The thermodynamic studies also indicated that the process was spontaneous, feasible, and endothermic. Several other recent and relevant studies reported on mercury adsorption using different adsorbents are discussed …”

Section: Purification Of Mercury‐containing Wastewater Using Low‐costmentioning

confidence: 99%

Trapping Ionic Mercury Using Different Adsorbents

Ojedokun

Oluwole

Bello

2019

CLEAN Soil Air Water

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Of recent, adsorption process has gained a lot of attention as a cheap and effective means of removing trace metals from wastewater prior to discharge into water bodies. Being flexible in design and operation, the process has enabled an optimal recovery of trace metals such that the treated effluents meet the desired standards for waste disposal. Mercury is a toxicant released into the environment from natural and anthropogenic sources. It is notorious for having an unusual tendency to bio‐accumulate and persist in the food chain. Presence of mercury in food, especially those of aquatic sources has drastic implications on human health. Therefore, efforts have been made to develop and optimize low‐cost activated carbon (AC) as adsorbents for scavenging mercury from aqueous effluents. Herein, how mercury accumulates across the food chain, its health implications, and the recent advancement in the use of low‐cost ACs as adsorbent for trapping mercury from wastewater are highlighted. Relationship between the mercury removal efficiency and the surface morphology of the adsorbents as well as the influence of prevailing experimental condition on the sorption process were addressed. Challenges and future prospects of the use of low‐cost adsorbents in addressing mercury pollution in the environment are discussed.

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Section: Purification Of Mercury‐containing Wastewater Using Low‐costmentioning

confidence: 99%

Trapping Ionic Mercury Using Different Adsorbents

Ojedokun

Oluwole

Bello

2019

CLEAN Soil Air Water

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“…Compared to various raw materials for carbon-based activated adsorbents, such as fly ash [ 17 , 18 ], agricultural waste [ 19 , 20 ], and marine resources (sargassum and enteromorpha) [ 21 ], HSPC shows advantages as a promising candidate for its global production and relative stability of quality as low-economic-value waste. Furthermore, it is the sulfur in HSPC, which is the reason for the unsatisfactory selection as fuel, that is expected to oxidize Hg 0 to HgS which is recognized as the most environmentally friendly form of mercury oxide.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

Jiang

Diao

2022

IJERPH

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As the solid waste by-product from the delayed coking process, high-sulfur petroleum coke (HSPC), which is hardly used for green utilization, becomes a promising raw material for Hg0 removal from coal-fired flue gas. The effects of the physical–chemical evolution of HSPC on Hg0 removal are discussed. The improved micropores created by pyrolysis and KOH activation could lead to over 50% of Hg0 removal efficiency with the loss of inherent sulfur. Additional S-containing and Br-containing additives are usually introduced to enhance active surface functional groups for Hg0 oxidation, where the main product are HgS, HgBr, and HgBr2. The chemical–mechanical activation method can make additives well loaded on the surface for Hg0 removal. The DFT method is used to sufficiently explain the micro-scale reaction mechanism of Hg0 oxidation on the surface of revised-HSPC. ReaxFF is usually employed for the simulation of the pyrolysis of HSPC. However, the developed mesoporous structure would be a better choice for Hg0 removal in that the coupled influence of pore structure and functional groups plays a comprehensive role in both adsorption and oxidation of Hg0. Thus, the optimal porous structure should be further explored. On the other hand, both internal and surface sulfur in HSPC should be enhanced to be exposed to saving sulfur additives or obtaining higher Hg0 removal capacity. For it, controllable pyrolysis with different pyrolysis parameters and the chemical–mechanical activation method is recommended to both improve pore structure and increase functional groups for Hg0 removal. For simulation methods, ReaxFF and DFT theory are expected to explain the micro-scale mechanisms of controllable pyrolysis, the chemical–mechanical activation of HSPC, and further Hg0 removal. This review work aims to provide both experimental and simulational guidance to promote the development of industrial application of Hg0 adsorbent based on HSPC.

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“…Nevertheless, the reaction between SO 2 and sorbents is very complicated because of the complex mineral composition of biomass ash. There are other studies using biomass char or activated carbon prepared from biomass to remove SO 2 . , Biomass ash can be utilized for flue gas desulfurization because of its strong alkalinity, while rare studies on the direct use of biomass ash for desulfurization have been reported so far.…”

Section: Introductionmentioning

confidence: 99%

SO₂ Absorption by Multiple Biomass Ash Types

Fei

Zhang

2021

ACS Omega

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As the severity of environmental pollution continues to increase and ultralow emission standards are proposed, biomass power plants must implement additional processes to control SO2 emission. Biomass ash can be utilized as a sorbent for flue gas desulfurization because of its strong alkalinity. In this study, the characteristics of SO2 absorption in simulated flue gas using four types of typical biomass ashes were studied in fixed bed experiments. The results showed that the addition of water, the increase in water vapor, and the lower temperature were beneficial for SO2 absorption. The main components of wheat straw ash are KCl and SiO2, cotton stalk ash is rich in K2O and calcium compounds, poplar bark ash has a considerable content of calcium compounds, and corncob ash contains large amounts of KCl and K2O. Alkali substances, such as oxides or carbonates of potassium and calcium, play a crucial role in SO2 absorption. The SO2 removal effect of corncob ash was the best owing to the abundance of potassium oxides. Meanwhile, wheat straw ash performed worst in SO2 removal due to the small amount of K2O and Ca. The desulfurization products were mainly potassium and calcium sulfate.

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Mercury removal and synergistic capture of SO2/NO by ammonium halides modified rice husk char

Cited by 83 publications

References 50 publications

Trapping Ionic Mercury Using Different Adsorbents

Trapping Ionic Mercury Using Different Adsorbents

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

SO₂ Absorption by Multiple Biomass Ash Types

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Mercury removal and synergistic capture of SO2/NO by ammonium halides modified rice husk char

Cited by 83 publications

References 50 publications

Trapping Ionic Mercury Using Different Adsorbents

Trapping Ionic Mercury Using Different Adsorbents

The Effects of Physical-Chemical Evolution of High-Sulfur Petroleum Coke on Hg0 Removal from Coal-Fired Flue Gas and Exploration of Its Micro-Scale Mechanism

SO2 Absorption by Multiple Biomass Ash Types

Contact Info

Product

Resources

About

SO₂ Absorption by Multiple Biomass Ash Types