Preparation of magnetic Co-Fe modified porous carbon from agricultural wastes by microwave and steam activation for mercury removal

Yang, Wei; Chen, Hui; Han, Xuan; Ding, Shuai; Ye, Shan; Liu, Yangxian

doi:10.1016/j.jhazmat.2019.120981

Cited by 143 publications

(64 citation statements)

References 54 publications

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“…The spent adsorbents were regenerated in air at 350 °C for 30 min. 15 Figure 5 shows the mercury removal efficiency of the series regenerated samples. It could be seen that after six regeneration and reuse cycles, the relative activity slightly decreases to 92%, which could be ascribed to the decrease in the active sites and destruction of the pore structures.…”

Section: Results and Discussionmentioning

confidence: 99%

Smart Modification of HZSM-5 with Manganese Species for the Removal of Mercury

Wang

Jin

et al. 2020

ACS Omega

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In this study, a series of Mn-modified HZSM-5 samples were synthesized using the solid-state ion-exchange method, and the effects of the manganese loading amount, calcination temperature, reaction temperature, and gas components on mercury removal efficiency were systematically explored. Given that the mass ratio of HZSM-5 to KMnO 4 and the calcination and reaction temperatures were set to 10:2.6 and 400 and 150 °C, Hg 0 removal efficiency could reach a peak value of 96.4% when exposed to the flue gas containing 5% O 2 and N 2 as the balance. Among the various gas components, O 2 and NO showed a positive impact on Hg 0 removal; Hg 0 removal efficiency could even reach ca. 100% when O 2 and NO were simultaneously introduced. In contrast, the introduction of SO 2 led to a decline of Hg 0 removal efficiency by ca. 16%. In addition, Hg 0 removal efficiency could still retain ca. 92% of that for the fresh sample after six regeneration and reuse cycles, which is indicative of a satisfactory stability and renewability. Finally, Mars–Maessen mechanisms dominated in the mercury chemical adsorption process.

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Section: Results and Discussionmentioning

confidence: 99%

Smart Modification of HZSM-5 with Manganese Species for the Removal of Mercury

Wang

Jin

et al. 2020

ACS Omega

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“…The pore structures in carbon shown significant improvements on activation with microwave and steam as observed during the formation of magnetic Co-Fe-impregnated porous carbon obtained from rice straw [177]. This indicated that porous carbons of different pore sizes can be produced by microwave or steam activation for the removal of dyes or pollutants of different sizes usually present in industrial wastewater.…”

Section: Nanoporous Carbonsmentioning

confidence: 87%

Carbon Nanomaterials for Wastewater Treatment

et al. 2021

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The research progress made in recent years in removal of organic-inorganic pollutants from wastewater using various types of carbon materials as adsorbents such as carbon nanotubes, carbon nanofibers, graphenes, graphitic carbon nitride, fullerene, activated carbon spheres, and carbon quantum dots is reviewed. These carbon nanomaterials with hierarchical structures are efficient and economical adsorbents. The techniques of metal impregnation and doping help to control the porosity and surface area of nanomaterials. Electrostatic forces, p-p and p-e interactions, van der Waals weak forces, and oxygen-containing groups are considered responsible for the removal of pollutants from wastewater. The carbon nanomaterial-based photocatalysts are applied successfully in decomposition of persistent dyes under visible light. Fe 3 O 4 magnetic material is employed as recyclable adsorbent after treatment of wastewater. Freundlich and Langmuir models are found more suitable to calculate the adsorption efficiency and adsorption kinetics of pollutants. Criteria and properties of carbon nanomaterials are discussed that might play a significant role in remediation of wastewater.

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“…To reduce the running costs, researchers have made great efforts to develop alternative carbon adsorbents. According to recent studies, biochar shows great promise in replacing AC owing to its low price and developable pore structure [10][11][12]. In China, the large amount of cheap and widely sourced agricultural straws have caused widespread interest owing to their application as raw materials for biochar production.…”

Section: Introductionmentioning

confidence: 99%

“…MW heating not only can overcome the shortcomings of traditional pyrolysis, i.e., slow and uneven heating, but also improve the quality of the pyrolysis products [31]. Many studies have found that MW-heated biochar exhibited better physical properties, e.g., surface area and porosity, than conventional biochar [10,12,32,33]. This is attributed to the generation of gases such as CO 2 and CO during the MW heating process, which promotes the formation of pores in the biochar [34].…”

Section: Introductionmentioning

confidence: 99%

Hg⁰ Removal by Straw Biochars Prepared with Clean Microwave/H₂O₂ Modification

Cui

Liu

2021

Chem Eng & Technol

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Biochar is one of the most promising adsorbents for Hg 0 from flue gas due to renewable raw materials. Cotton straw and maize straw biochars prepared by microwave activation and H 2 O 2 modification were used for removing Hg 0 from flue gas. Hg 0 capture efficiency and mechanism on biochars were studied. Cotton straw and maize straw biochars modified with 2 and 10 % H 2 O 2 , respectively, show optimal Hg 0 removal performance exceeding that of activated carbon. Microwave activation and H 2 O 2 impregnation greatly improve the BET surface areas of the biochars. H 2 O 2 impregnation increases the number of O-containing functional groups, i.e., O-H and C-O, on the biochar surface, enhancing Hg 0 removal. Chemisorption dominates the Hg 0 capture on biochars.

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Preparation of magnetic Co-Fe modified porous carbon from agricultural wastes by microwave and steam activation for mercury removal

Cited by 143 publications

References 54 publications

Smart Modification of HZSM-5 with Manganese Species for the Removal of Mercury

Smart Modification of HZSM-5 with Manganese Species for the Removal of Mercury

Carbon Nanomaterials for Wastewater Treatment

Hg⁰ Removal by Straw Biochars Prepared with Clean Microwave/H₂O₂ Modification

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Preparation of magnetic Co-Fe modified porous carbon from agricultural wastes by microwave and steam activation for mercury removal

Cited by 143 publications

References 54 publications

Smart Modification of HZSM-5 with Manganese Species for the Removal of Mercury

Smart Modification of HZSM-5 with Manganese Species for the Removal of Mercury

Carbon Nanomaterials for Wastewater Treatment

Hg0 Removal by Straw Biochars Prepared with Clean Microwave/H2O2 Modification

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Product

Resources

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Hg⁰ Removal by Straw Biochars Prepared with Clean Microwave/H₂O₂ Modification