Pyrolysis of sludge briquettes for the preparation of cylindrical-shaped biochar and comparison between CO2 and steam activation

Deng, Wei; Xu, Shiyao; Hu, Mingtao; Chen, Guang; Ji, Hongxian; Zhou, Piren; Su, Yaxin

doi:10.1016/j.fuel.2022.127317

Cited by 8 publications

(2 citation statements)

References 58 publications

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“…Meanwhile, through decomposition and carbonchain formation, tetrabutylammonium is utilized to synthesize O/N/B doped CA, as depicted in Figure S3. 43 The crystal structure of O-CA, ON-CA, and ONB-CA was analyzed using XRD spectroscopy (Figure 1A). All samples show two prominent diffraction peaks at 24°and 44°, relating to (002) and (101) crystal planes of carbon, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage

Xie,

Liu,

et al. 2023

Carbon Energy

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The incorporation of heteroatoms into carbon aerogels (CAs) can lead to structural distortions and changes in active sites due to their smaller size and electronegativity compared to pure carbon. However, the evolution of the electronic structure from single‐atom doping to heteroatom codoping in CAs has not yet been thoroughly investigated, and the impact of codoping on potassium ion (K+) storage and diffusion pathways as electrode material remains unclear. In this study, experimental and theoretical simulations were conducted to demonstrate that heteroatom codoping, composed of multiple heteroatoms (O/N/B) with different properties, has the potential to improve the electrical properties and stability of CAs compared to single‐atom doping. Electronic states near the Fermi level have revealed that doping with O/N/B generates a greater number of active centers on adjacent carbon atoms than doping with O and O/N atoms. As a result of synergy with enhanced wetting ability (contact angle of 9.26°) derived from amino groups and hierarchical porous structure, ON‐CA has the most optimized adsorption capacity (−1.62 eV) and diffusion barrier (0.12 eV) of K+. The optimal pathway of K+ in ON‐CA is along the carbon ring with N or O doping. As K+ storage material for supercapacitors and ion batteries, it shows an outstanding specific capacity and capacitance, electrochemical stability, and rate performance. Especially, the assembled symmetrical K+ supercapacitor demonstrates an energy density of 51.8 Wh kg−1, an ultrahigh power density of 443 W kg−1, and outstanding cycling stability (maintaining 83.3% after 10,000 cycles in 1 M KPF6 organic electrolyte). This research provides valuable insights into the design of high‐performance potassium ion storage materials.

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Section: Resultsmentioning

confidence: 99%

“…During high‐temperature pyrolysis, the reaction between B and N 2 with carbon chains leads to the formation of H 2 and BN. Meanwhile, through decomposition and carbon‐chain formation, tetrabutylammonium is utilized to synthesize O/N/B doped CA, as depicted in Figure 43 …”

Section: Resultsmentioning

confidence: 99%

Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage

Xie,

Liu,

et al. 2023

Carbon Energy

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Sludge-based biochar adsorbent: pore tuning mechanisms, challenges, and role in carbon sequestration

Mian,

Ao,

Deng

2023

Biochar

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Sludge biochar, a carbonized product of raw sludge, contains porous architectures that can act as epicenters for adsorbing external molecules through physical or chemical bonding. Sludge biochar also immobilizes innate micropollutants, which is advantageous over conventional sludge disposal methods. To date, numerous strategies have been discovered to improve sludge biochar morphology, but the influential factors, pore tuning mechanisms, and process feasibility remain imprecise. This knowledge gap limits our ability to design a robust sludge-based biochar. Herein, we present state-of-the-art sludge biochar synthesis methods with insight into structural and chemical transformation mechanisms. Roadblocks and novel concepts for improving sludge biochar porous architecture are highlighted. For the first time, sludge biochar properties, adsorption performances, and techno-economic perspectives were compared with commercial activated carbon (AC) to reveal the precise challenges in sludge biochar application. More importantly, sludge biochar role in carbon sequestration is detailed to demonstrate the environmental significance of this technology. Eventually, the review concludes with an overview of prospects and an outlook for developing sludge biochar-based research. Graphical Abstract

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Fabrication of CeO2/municipal sludge-based biochar composites with outstanding photocatalytic degradation properties

Li,

Wang,

Liu

et al. 2023

Inorganic Chemistry Communications

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Pyrolysis of sludge briquettes for the preparation of cylindrical-shaped biochar and comparison between CO2 and steam activation

Cited by 8 publications

References 58 publications

Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage

Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage

Sludge-based biochar adsorbent: pore tuning mechanisms, challenges, and role in carbon sequestration

Fabrication of CeO2/municipal sludge-based biochar composites with outstanding photocatalytic degradation properties

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