The Adsorption Affinity of N-Doped Biochar Might Play a Crucial Role in Peroxydisulfate Activation and Bisphenol a Oxidative Degradation

31 Pages Posted: 12 Oct 2021

See all articles by Jie Zhong

Jie Zhong

South China Normal University

Shaojun Jiang

South China Normal University

Yancheng Ma

South China Normal University

Guanglin Dai

South China Normal University

Zhenyuan Liu

South China Normal University

Yuehong Shu

South China Normal University

Abstract

Metal-free biochar as an efficient catalyst to activate persulfate (PS) and degrade organic contaminants has attracted great attention in advanced oxidation processes (AOPs), while, the role of biochar adsorption in the activation and oxidative decomposition process is important and still needed to be further clarified. In this study, nitrogen doped porous biochar derived from waste litchi branch was prepared as peroxydisulfate (PDS) activator for bisphenol A (BPA) degradation, in which the regulation behavior of biochar adsorption was evaluated on the base of phase distribution and PDS activation mechanism. Biochar obtained at 800 ℃ with N-doped and sodium carbonate added presented high specific surface area (821 m 2 /g), abundant nanopores and graphitic structure, and showed the best adsorption capacity and catalytic activity towards BPA. At the dosage of 0.15 g/L 800CN, 95% BPA can be completely degraded within 60 minutes with an apparent rate constant (k obs ) of 0.0483 min -1 . The identified active sites and reactive oxygen species as well as electrochemical tests suggested that both free radicals O 2 • - and •OH and non-radical pathways including 1 O 2 originated from C=O and surface electron transfer mechanisms were involved in BPA decomposition. In this study, the phase distribution analysis, reaction kinetics, biochar reuse experiments and activation mechanisms all confirmed that BPA adsorption on 800CN surface was an extreme crucial step for BPA oxidative degradation . This work not only presented an effective metal-free PDS activator, but also enables the deep insights into the regulation behavior of biochar adsorption on organics oxidative degradation.

Keywords: Biochar, Adsorption, Peroxydisulfate, Interface reaction, BPA

Suggested Citation

Zhong, Jie and Jiang, Shaojun and Ma, Yancheng and Dai, Guanglin and Liu, Zhenyuan and Shu, Yuehong, The Adsorption Affinity of N-Doped Biochar Might Play a Crucial Role in Peroxydisulfate Activation and Bisphenol a Oxidative Degradation. Available at SSRN: https://ssrn.com/abstract=3940886 or http://dx.doi.org/10.2139/ssrn.3940886

Jie Zhong

South China Normal University ( email )

483 Wushan Str.
Tianhe District
Guangzhou, 510631, 510642
China

Shaojun Jiang

South China Normal University ( email )

483 Wushan Str.
Tianhe District
Guangzhou, 510631, 510642
China

Yancheng Ma

South China Normal University ( email )

483 Wushan Str.
Tianhe District
Guangzhou, 510631, 510642
China

Guanglin Dai

South China Normal University ( email )

483 Wushan Str.
Tianhe District
Guangzhou, 510631, Guangdong 510642
China

Zhenyuan Liu

South China Normal University ( email )

483 Wushan Str.
Tianhe District
Guangzhou, 510631, Guangdong 510642
China

Yuehong Shu (Contact Author)

South China Normal University ( email )

483 Wushan Str.
Tianhe District
Guangzhou, 510631, 510642
China

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