Air pre-oxidation induced high yield N-doped porous biochar for improving toluene adsorption

Jin, Ziheng; Wang, Bangda; Ma, Liang; Fu, Pengbo; Xie, Lingling; Jiang, Xia; Jiang, Wenju

doi:10.1016/j.cej.2019.123843

Cited by 90 publications

(18 citation statements)

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“…According to the IUPAC, the rapidly increased nitrogen adsorption capacity at P/P 0 below 0.1 indicates an abundance of micropore structures of Cu x Ce/ CAC-CNTs (Figure 2a). The multilayer adsorption followed by capillary condensation at P/P 0 > 0.4 was significant, pointing to the presence of the mesopore structure, 29 which could be proven by the hysteresis loop of isotherms. Compared to the Ce/CAC-CNTs, the CuO x introduced showed that the pore structure of the Cu x Ce/CAC-CNTs was blocked.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Surface Atomic Concentrations of Cu 0.2 Ce/CAC-CNTs and Cu 0.2 Ce/CAC-CNTs-DeNO x (S) , and Ce 3d spectra. In Figure4a, the Ce/CAC-CNTs and Cu x Ce/CAC-CNTs had four energy peaks of C−C (284.3 eV), C−O−C (285.1 eV), CO (286.1 eV), and COO − (289.4 eV) 29,36. The Cu 0.2 Ce/CAC-CNTs had the highest relative content of acidity functional groups (C−O−C and COO − ) at 47.79% (Table2) and gradually reduced to 47.18 and 41.26% when the Cu/Ce molar ratios were 0.4 (Cu 0.4 Ce/ CAC-CNTs) and 0.6 (Cu 0.6 Ce/CAC-CNTs).…”

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confidence: 99%

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Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

Yang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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The stumbling block to the ever-increasing need for improving air quality remains nitrogen oxides (NO x ). The copper-introduced Ce/CAC-CNT (Cu x Ce/CAC-CNTs) catalyst using the in situ-growth-prepared activated carbon and carbon-nanotube composite (CAC-CNT) carrier with high sulfur dioxide tolerance was successfully applied to low-temperature NH3–SCR in this study. The findings indicate that the Cu x Ce/CAC-CNTs obtained at a 0.2 Cu/Ce molar ratio and the calcination temperature of 450 °C showed the highest 100% NO conversion with 95.8% N2 selectivity at 150 °C and 10 000 h–1. The incorporation of Cu improved the Cu0.2Ce/CAC-CNTs in Lewis acid, lattice oxygen (31.99%), and Ce3+ (26.03%). The accelerated NH3 adsorption on acid sites, the encouraging electron transfer by the Ce4+ + Cu+ ↔ Ce3+ + Cu2+ redox circle, and the more surface chemisorbed oxygen (Oβ) improved the catalytic activity of Cu0.2Ce/CAC-CNTs. The NH3–SCR of Cu0.2Ce/CAC-CNTs largely follows the L–H mechanism, together with a certain degree of “Fast SCR.” The added Cu species effectively prevented surface SO2 adsorption and oxidation, and the Cu0.2Ce/CAC-CNTs restored more than 94% SCR activity after 8 h of poisoning in 50 ppm SO2 and 5 vol % H2O.

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Section: ■ Results and Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

Yang

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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“…In addition, ammonium salts have also been employed to synthesize N-doped biochar. Different ammonia salts have been reported, e.g., ammonium chloride (Wang et al 2018), ammonium hydroxide (Xu et al 2019), ammonium phosphate (Jin et al 2020), ammonium nitrate (Kasera et al 2021), and others have been used to synthesize N-doped biochar. These salts decompose to form NH 3 during pyrolysis.…”

Section: External Nitrogen Resourcesmentioning

confidence: 99%

“…For example, Chen et al reported that carbonyl groups on the biochar surface reacted with NH 3 through Maillard reaction accompanied by H 2 production (Chen et al 2016). According to Jin et al, carboxyl groups might form H-bonds with NH 3 that favor N-doping (Jin et al 2020). Mian et al linked the formation of amino groups (R-NH 2 ) with the abundance of -OH groups in agar powder that reacted with NH 3 molecules at high temperatures (Mian et al 2018).…”

Section: Post-treatment Approachmentioning

confidence: 99%

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Kasera

Kolar

Hall

2022

Biochar

116

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Mitigation of toxic contaminants from wastewater is crucial to the safety and sustainability of the aquatic ecosystem and human health. There is a pressing need to find economical and efficient technologies for municipal, agricultural, aquacultural, and industrial wastewater treatment. Nitrogen-doped biochar, which is synthesized from waste biomass, is shown to exhibit good adsorptive performance towards harmful aqueous contaminants, including heavy metals and organic chemicals. Incorporating nitrogen into the biochar matrix changes the overall electronic structure of biochar, which favors the interaction of N-doped biochar with contaminants. In this review, we start the discussion with the preparation techniques and raw materials used for the production of N-doped biochar, along with its structural attributes. Next, the adsorption of heavy metals and organic pollutants on N-doped biochars is systematically discussed. The adsorption mechanisms of contaminant removal by N-doped biochar are also clearly explained. Further, mathematical analyses of adsorption, crucial to the quantification of adsorption, process design, and understanding of the mechanics of the process, are reviewed. Furthermore, the influence of environmental parameters on the adsorption process and the reusability of N-doped biochars are critically evaluated. Finally, future research trends for the design and development of application-specific preparation of N-doped biochars for wastewater treatment are suggested. Graphical abstract

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“…There is a growing consensus on modulating the functional group and internal textural structure, which play key factors in improving the adsorption performance of carbon-based material. The surface functional group can be modified by using various methods including acid/base treatment, chemical oxidation or impregnation with metal elements (Jin et al 2020, Tang et al 2020, Wang et al 2020a. Notably, acid modification can change the surface alkalinity and oxygen-containing functional groups, which thus enhance the VOC selectivity and adsorption capacity (Kim et al 2006, Tham et al 2011, Vega et al 2013b.…”

Section: Introductionmentioning

confidence: 99%

Efficient toluene adsorption/desorption on biochar derived from in situ acid-treated sugarcane bagasse

Yuan

Chen

et al. 2021

Environ Sci Pollut Res

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Carbon-based materials with great adsorption performance are of importance to meet the needs of industrial gas adsorption. Being massive agricultural wastes of sugarcane bagasse, China could use this waste into wealth. However, the comprehensive utilization of sugarcane bagasse as precursors for biochar that can be used as adsorbent has not been extensively explored. In this study, a series of in-situ sulfuric acid modified biochar were prepared by hydrothermal carbonization process. The prepared biochar (SBAC-7) is combined of two main advantages that are high microporosity (micropore surface area = 1106 m 2 /g) and rich in Scontaining functional groups on the surface. In particular, SBAC-7 showed an excellent adsorption capacity of toluene (771.1 mg/g) at 30 o C, which is nearly 3 times as high as the commercial activated carbons. Meanwhile, it showed great stability and cyclic regeneration performance with five toluene adsorption-desorption test cycles. This study provides a highperformance biochar for adsorption-desorption cycle in practical engineering applications, and would contribute to the sustainable "sugarcane production -bagasse utilization" circular economy.

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Air pre-oxidation induced high yield N-doped porous biochar for improving toluene adsorption

Cited by 90 publications

References 56 publications

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Efficient toluene adsorption/desorption on biochar derived from in situ acid-treated sugarcane bagasse

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Air pre-oxidation induced high yield N-doped porous biochar for improving toluene adsorption

Cited by 90 publications

References 56 publications

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH3–SCR

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH3–SCR

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Efficient toluene adsorption/desorption on biochar derived from in situ acid-treated sugarcane bagasse

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Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH₃–SCR