Persulfate oxidation enhanced extraction to improve the removal of high concentration phenol wastewater

Bao, Kai; Cheng, Yan; Niu, Deli; Yin, Yiming; Wan, Jun

doi:10.1039/d1ew00683e

Cited by 5 publications

(1 citation statement)

References 75 publications

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“…For decades, the coal industry has remained a major source of wastewater ( Mz et al, 2020 ). In addition, numerous phenolic pollutants are present in coal chemical wastewater, which complicates its composition and water quality ( Ji et al, 2015 ; He et al, 2021 ; Bao et al, 2022 ). Particularly, semi-coking wastewater ( Liu et al, 2021 ), which is produced by the carbonization of coal at low (500–600°C) and medium (700–800°C) temperatures ( Bai et al, 2022 ), is contaminated with phenols, ammonia, hydrogen sulfide, carbon dioxide, and oil, etc.…”

Section: Introductionmentioning

confidence: 99%

Self-doped N, S porous carbon from semi-coking wastewater-based phenolic resin for supercapacitor electrodes

Yan

Wang²,

Wang³

et al. 2022

Front. Chem.

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Contamination of phenolic compounds has devastating effects on the environment. Therefore, its harmless treatment and recycling have received extensive attention. Herein, a novel method for preparing N-S doped phenolic resin (NSPR) from phenols, N and S groups in semi-coking wastewater, and formaldehyde are developed. The KOH is consequently incorporated into the NSPR through simultaneous carbonization and activation in a single step to produce porous carbon material (NSPC). The as-obtained NSPC exhibits a high specific capacitance of 182 F g−1 at 0.5 A g−1, a high energy density of 9.1 Wh kg−1 at a power density of 0.15 kW kg−1, and remarkable cycling stability in aqueous KOH electrolyte. This outstanding electrochemical performance is attributed to its ultrahigh specific surface area (SSA, 2,523 m2 g−1), enormous total pore volume (Vt, 1.30 cm3 g−1), rational pore structure, and N-S heteroatom self-doping (0.76 at% N and 0.914 at% S), which ensures adequate charge storage, rapid electrolyte ion diffusion, and contributed pseudo-capacitance. This work not only provides a facile method for transforming phenolic wastewater into high-value products but also offers a cost-effective and high-performance porous carbon material for supercapacitors.

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