Structural characterization and confined pyrolysis of resistant aliphatic biopolymer derived from cyanobacteria

Kong, Xianglan; Huang, Ning; Hu, Shujie; Zhang, Xiangyun; Ran, Yong

doi:10.1016/j.orggeochem.2021.104352

Cited by 4 publications

(2 citation statements)

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“…A higher (CH 2 ) n content was observed in the marine sediments (S11, S21, M9, and M10) than in the river or estuary sediments (BET and GSD; Table 1). These observations indicate that marine SOM is primarily derived from aquatic phytoplankton (Kong et al., 2022; Lu et al., 2022). From the Pearl River to the South China Sea, the F alip in the ROC fractions increased from 45.6% to 63.5%.…”

Section: Resultsmentioning

confidence: 98%

“…When the spectral editing technique of DD was employed, the CP/TOSS/DD NMR spectra showed Arom C ─ C/mobile groups ( ─ CH 3 , ─ (CH 2 ) n ─ ) in the ROC factions (Figure 2, thick line). The signals of the aromatic bands changed only slightly, indicating that they were Arom C ─ C, which may be derived from a persistent sporopollenin/algaenan structure or black carbon (Dan et al., 2022; Jaffé et al., 2013; Kong et al., 2022; Lu et al., 2022; Tiwari et al., 2020).…”

Section: Resultsmentioning

confidence: 99%

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Effect of organic carbon structures on the degradation of nonylphenol by hydrogen peroxide in sediment–water system

Zhang,

Kong,

Yang

et al. 2023

J of Env Quality

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A laboratory experiment is conducted to investigate the effects of organic carbon (OC) from riverine and marine sediments on the degradation of ring‐14C labeled nonylphenol (14C‐NP) by hydrogen peroxide (H2O2). Researchers have isolated demineralized OC before and after oxidation, namely demineralized OC (DM) and resistant OC (ROC) fractions, respectively. The structures of DM and ROC are characterized using solid‐state 13C nuclear magnetic resonance. Unstable structures (O‐alkyl, OCH3/NCH, and COO/NC = O) show a significant and positive correlation with the degradation of 14C‐NP (R2 > 0.73, p < 0.05), thus suggesting that the NP absorbed in the unstable structures are easily degraded because of the decomposition of unstable components. The stable structures (alkyl C and non‐protonated aromatic C (Arom C‐C)) exhibit a significant and negative correlation with the degradation of 14C‐NP (R2 > 0.69, p < 0.05), thus suggesting that the NP absorbed and protected in these resistant structures are minimally degraded. The significant correlations among the degradation kinetic parameters (Frap and Fslow), OC structures (Falip and Farom), and microporosity further illustrate the important protective roles of OC structures and micropores in the degradation of 14C‐NP by H2O2 (R2 > 0.69, p < 0.05). The parent NP fraction that desorbed into the aqueous solution or extracted is completely degraded, indicating preferential degradation of the easily desorbed NP. This study provides important insights into the NP degradation mechanism in sediment–water systems, particularly regarding sediment OC structures and microporosity.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 98%