Removal of gaseous elemental mercury using corn stalk biochars modified by a green oxidation technology

Liu, Yangxian; Cui, Shuaibo; Wu, Peng; Liu, Lei; Dou, Zhifei; Wang, Yan

doi:10.1016/j.fuproc.2022.107621

Cited by 13 publications

(5 citation statements)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After steam activation, the specific surface area of the sample is greatly improved, from 23.57 to 106.12 m 2 /g. The results showed that steam activation could improve the pore structure of corn straw coke, which was conducive to mercury adsorption and provide a new site for the attachment of the modifier . After the modification of elemental sulfur, the specific surface area of the sample is reduced to 5.46 and 6.26 m 2 /g, indicating that elemental sulfur will block the pore structure of the sample during the modification …”

Section: Resultsmentioning

confidence: 99%

“…The results showed that steam activation could improve the pore structure of corn straw coke, which was conducive to mercury adsorption and provide a new site for the attachment of the modifier. 32 After the modification of elemental sulfur, the specific surface area of the sample is reduced to 5.46 and 6.26 m 2 /g, indicating that elemental sulfur will block the pore structure of the sample during the modification. 33 The N 2 adsorption and desorption curves of the four adsorbent materials are shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

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 .

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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.

View full text Add to dashboard Cite

show abstract

“…Adsorbents consist of solid substances which have the ability to remove gaseous pollutants through adsorption process [12][13][14]. In this regard, adsorbents must have a large surface area, appropriate pore dimensions, and strong adsorption capacity [15].…”

Section: Traditional Adsorbents For Indoor Pollutantsmentioning

confidence: 99%

Indoor Air Quality Treatment Using Polymer Nanocomposite Adsorbents

Kausar¹

2023

PSPRJ

View full text Add to dashboard Cite

“…But the conventional chlorine modification is susceptible to temperature-limited activity, considering that acid modification not only facilitates the introduction of additional oxygen-containing functional groups on the surface, 29 but also enhances the reactivity of chlorine, 30 resulting in a more stable immobilization of mercury on the adsorbent surface. 31,32 Therefore, the modification technique of acid-chlorine impregnation will be used to study the influence of the acid−chlorine ratio and mass ratio of modifier to rice straw coke on the performance of modified rice straw coke for mercury removal. Temperature and inlet mercury concentration are important influences that interfere with the removal of mercury from adsorbents.…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies, , chloride-modified biomass coke can incorporate active chlorine-containing functional groups on the coke surface, which exhibit high reactivity against Hg 0 , facilitating its capture from flue gas. But the conventional chlorine modification is susceptible to temperature-limited activity, considering that acid modification not only facilitates the introduction of additional oxygen-containing functional groups on the surface, but also enhances the reactivity of chlorine, resulting in a more stable immobilization of mercury on the adsorbent surface. , Therefore, the modification technique of acid-chlorine impregnation will be used to study the influence of the acid–chlorine ratio and mass ratio of modifier to rice straw coke on the performance of modified rice straw coke for mercury removal.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Le,

Wang,

Zeng

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

Coal-fired power plants are a significant source of mercury pollution, necessitating the development of inexpensive and efficient adsorbents for mercury removal. This work proposes the preparation of an adsorbent using acid-chlorine-modified rice straw coke for this purpose. The characterization of the adsorbent shows that the modification increases the surface pore structure and makes the surface carry abundant oxygen-containing functional groups, which is conducive to improving the mercury removal capacity of the adsorbent. This work studies the effects of the acid–chlorine ratio, mass ratio, inlet mercury concentration, and reaction temperature on the desorption performance of modified rice straw coke and investigates the mechanism of mercury removal by combining the kinetic model and density functional theory. The results demonstrate that the optimal effect of the combined acid–chlorine modification is achieved at an acid–chlorine ratio and mass ratio of 1:2. The reaction temperature has a significant effect on the efficiency of mercury removal, and the increase of the inlet mercury concentration can promote mercury removal. The mercury adsorption process is primarily controlled by surface mass transfer and chemisorption, with chemisorption being the critical control step. The introduction of Cl and O atoms through modification creates doped structures that are highly conducive to mercury adsorption. The Cl atom exhibits greater reactivity toward the Hg atom, facilitating the removal of mercury. The presence of O atoms not only increases the abundance of oxygen-containing functional groups on the surface, but also enhances the activity of the Cl atoms. These findings provide valuable theoretical support for the application of biomass coke in the field of mercury removal, addressing mercury pollution associated with coal-fired power plants.

show abstract

Removal of gaseous elemental mercury using corn stalk biochars modified by a green oxidation technology

Cited by 13 publications

References 78 publications

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

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

Indoor Air Quality Treatment Using Polymer Nanocomposite Adsorbents

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Contact Info

Product

Resources

About