H3PO4-assisted preparation of precursor-derived porous carbon: Construction of precursor/precursor-derived porous carbon texture properties relationship

Wang, Liangcai; Wu, Jielong; Gao, Yi; Sha, Likun; Ma, Hongwen; Li, Xiang

doi:10.1016/j.diamond.2021.108596

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…To solve the above problems, activation has aroused growing attention because the existence of activators can enhance the specific surface area [ 9 , 10 ]. Accordingly, a series of activators for activation processes have been investigated, including H 3 PO 4 [ 11 ], KOH [ 12 ], and ZnCl 2 [ 13 ]. However, KOH and ZnCl 2 can pollute the environment, which limits the large-scale production of activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Co-Pyrolysis for Pine Sawdust with Potassium Chloride: Insight into Interactions and Assisting Biochar Graphitization

Xie

Wang

2023

Materials

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This effort aimed to explore the activation and catalytic graphitization mechanisms of non-toxic salts in converting biomass to biochar from the perspective of pyrolysis kinetics using renewable biomass as feedstock. Consequently, thermogravimetric analysis (TGA) was used to monitor the thermal behaviors of the pine sawdust (PS) and PS/KCl blends. The model-free integration methods and master plots were used to obtain the activation energy (E) values and reaction models, respectively. Further, the pre-exponential factor (A), enthalpy (ΔH), Gibbs free energy (ΔG), entropy (ΔS), and graphitization were evaluated. When the KCl content was above 50%, the presence of KCl decreased the resistance to biochar deposition. In addition, the differences in the dominant reaction mechanisms of the samples were not significant at low (α ≤ 0.5) and high (α ≥ 0.5) conversion rates. Interestingly, the lnA value showed a linearly positive correlation with the E values. The PS and PS/KCl blends possessed positive ΔG and ΔH values, and KCl was able to assist biochar graphitization. Encouragingly, the co-pyrolysis of the PS/KCl blends allows us to target-tune the yield of the three-phase product during biomass pyrolysis.

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Section: Introductionmentioning

confidence: 99%

Co-Pyrolysis for Pine Sawdust with Potassium Chloride: Insight into Interactions and Assisting Biochar Graphitization

Xie

Wang

2023

Materials

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“…Organic pollutants in water have become a great threat to the aquatic environment and human health because of their characteristics of easy bioaccumulation in food chain and refractory degradation. , Thus, there is an urgent necessity to accurately monitor residual organic pollutants in water bodies. , Photoelectrochemical (PEC) technology over suitable photoactive materials is considered an effective strategy to the quantitative detection of organic pollutants . Undoubtedly, photoactive materials with excellent photoelectric conversion efficiency are the key premise for the PEC detection of organic pollutants .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Thus, there is an urgent necessity to accurately monitor residual organic pollutants in water bodies. 3,4 Photoelectrochemical (PEC) technology over suitable photoactive materials is considered an effective strategy to the quantitative detection of organic pollutants. 5 Undoubtedly, photoactive materials with excellent photoelectric conversion efficiency are the key premise for the PEC detection of organic pollutants.…”

Section: ■ Introductionmentioning

confidence: 99%

Cu(II)-Grafted Carbon Nitride Quantum Dots with High Crystallinity for Photoelectrochemical Detection Application

Wang

Chen

Qinqin

et al. 2022

Ind. Eng. Chem. Res.

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The rapid growth of industry inevitably leads to a large variety of organic pollutants in the aquatic environment. The design of a photoelectrochemical (PEC) sensor is significant to achieve the goal of sensitive quantitative determination of organic pollutant residues. In this work, the graphitic carbon nitride (g-C 3 N 4 ) quantum dots (CNQDs) with high crystallinity were synthesized through the step-by-step cutting of bulk g-C 3 N 4 , which were modified with Cu(II) and then utilized to the fabrication of a PEC sensor for monitoring the typical organic pollutant methyl viologen in water. In the detection process, by means of the redox of Cu(II)/Cu(I), Cu(II) can effectively accelerate the photogenerated carriers' separation of CNQDs, and facilitate the reduction of methyl viologen, contributing to the notable photocurrent signal. More importantly, the stable PEC sensor presents a perfect linearity between the change in photoelectric signal and logarithm of methyl viologen concentrations ranging from 0.1 to 200 ng mL −1 . Thus, the constructed Cu-CNQDs 2% can be widely utilized in the quantitative determination of methyl viologen in real monitoring of environmental pollutants.

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Inspired by the Seeking Knowledge Strategy for Analects of Confucius to Screen Highly Electrochemically Active Porous Carbon: The Critical Source of Electroactive Sites

Wang,

Ma,

Chen

et al. 2024

Small Structures

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In this work, the forestry wastes are converted into a series of porous carbons using H3PO4 activation. These porous carbons feature a large specific surface area (1045.20 m2 g−1) and porosity that combines micro‐, meso‐, and macropores in various amounts depending on the fuel properties recorded for precursors used. Importantly, the C content recorded for forestry waste is one of the crucial factors in defining the specific surface area of the derived porous carbons. In addition, the total capacitance of the pine‐sawdust‐based porous carbon (PS‐C) sample is the highest, such as 220.55 F g−1 upon 5 mV s−1. Notably, the electrical double‐layer capacitance recorded for the samples remains essentially constant with increasing scan rates, such as ≈91.50 F g−1 for the olive‐shell‐based porous carbon, ≈123.70 F g−1 for PS‐C, and ≈105.66 F g−1 for the pine‐needle‐based porous carbon. Encouragingly, the pore‐associated sp3 site holds significant roles in the electrochemical application of the porous carbons. More importantly, the O/C value recorded for the precursor can be employed as a universal predictor of electrochemically active sites produced in porous carbons. In the findings, crucial insights are exhibited into the optimized fabrication of porous carbon with target electrochemically active sites for other applications such as catalysis.

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H3PO4-assisted preparation of precursor-derived porous carbon: Construction of precursor/precursor-derived porous carbon texture properties relationship

Cited by 11 publications

References 34 publications

Co-Pyrolysis for Pine Sawdust with Potassium Chloride: Insight into Interactions and Assisting Biochar Graphitization

Co-Pyrolysis for Pine Sawdust with Potassium Chloride: Insight into Interactions and Assisting Biochar Graphitization

Cu(II)-Grafted Carbon Nitride Quantum Dots with High Crystallinity for Photoelectrochemical Detection Application

Inspired by the Seeking Knowledge Strategy for Analects of Confucius to Screen Highly Electrochemically Active Porous Carbon: The Critical Source of Electroactive Sites

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