Impact of humic acid coating on sorption of naphthalene by biochars

Zhang, Meng; Shu, Liang; Guo, Xiaoying; Shen, Xiaofang; Zhang, Haiyun; Shen, Guofeng; Wang, Bin; Yang, Yu; Tao, Shu; Wang, Xilong

doi:10.1016/j.carbon.2015.07.079

Cited by 38 publications

(10 citation statements)

References 54 publications

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“…Several observations for effect of DOM on sorption of organic pollutants by biochar have been reported, including competition for adsorption sites, pore blockage by DOM coating and provision of extra sorption sites or partitioning phase for organic pollutants (Lian et al 2015;Wu et al 2018a;Zhang et al 2015). The increased K p after addition of DHA was directly attributed to enhanced partitioning of BTA into DHA covered on biochar, which was supported by the observed results of BTA sorption to DHA (Fig.…”

Section: Effect Of Dha On Bta Sorptionsupporting

confidence: 67%

“…New evidence presents the fact that the sorptive activities of biochar for organic contaminants can be strongly influenced by coexisting dissolved organic matter (DOM) in the environment (Zhang et al 2015). It was found that DOM reduced sorption of organic contaminants to carbonaceous materials via competition or hindering the accessibility of adsorption sites (Engel and Chefetz 2016;Wu et al 2018a).…”

Section: Introductionmentioning

confidence: 99%

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Predicting the effect of dissolved humic acid on sorption of benzotriazole to biochar

Zhao

2022

Biochar

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Dissolved organic matter plays a critical role in affecting sorption properties of biochar for organic contaminants. In this study, dissolved humic acid (DHA) as a representative of dissolved organic matter and oak sawdust-derived biochar as a sorbent were prepared and characterized. Roles of DHA in sorption of benzotriazole (BTA), an emerging organic contaminant, to biochar in different electrolyte solutions were investigated. The results revealed the dual roles of DHA in BTA sorption to biochar. On the one hand, DHA can compete for sites and/or block pores available for BTA to inhibit the adsorption of BTA to biochar. On the other hand, the sorbed DHA on biochar can serve as additional partitioning phase to promote the partition of BTA. The finding was in accordance with the site energy distribution analysis of BTA sorption that the site energy of the highest occurring frequency in the DHA-BTA system was lower than that in the DHA-free system (3.41–10.4 versus 13.1–20.1 kJ mol−1). The variation in apparent BTA sorption to biochar affected by DHA was thus a combination of changes in both its partition and adsorption properties. A modified Dual-mode model including the aqueous concentration of DHA was proposed to predict the effect of DHA on BTA sorption to biochar in different electrolyte solutions, which showed good prediction performance with most BTA sorption coefficient (Kd, L g−1) deviations within 0.1 log unit.

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Section: Effect Of Dha On Bta Sorptionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Predicting the effect of dissolved humic acid on sorption of benzotriazole to biochar

Zhao

2022

Biochar

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“…S7). Sorption of O-rich DOC molecules covers the reactive aromatic structures and enhances hydrophilicity on the biochar surfaces (Zhu et al, 2005;Mitchell and Simpson, 2013;Wiedner et al, 2015), thus hinders the adsorption and/or partition of the NOCs (Yang and Xing, 2010;Zhang et al, 2015). Concomitantly, surface coating of O-rich DOC led to lower nonlinear sorption on the aged biochars (Chen et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Insights into the attenuated sorption of organic compounds on black carbon aged in soil

Luo

Chen

et al. 2017

Environmental Pollution

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Sorption of organic compounds on fresh black carbons (BCs) can be greatly attenuated in soil over time. We examined herein the changes in surface properties of maize straw-derived BCs (biochars) after aged in a black soil and their effects on the sorptive behaviors of naphthalene, phenanthrene and 1,3-dinitrobenzene. Dissolved fulvic and humic acids extracted from the soil were used to explore the role of dissolved organic carbon (DOC) in the aging of biochars. Chromatography analysis indicated that DOC molecules with relatively large molecular weight were preferentially adsorbed on the biochars during the aging processes. DOC sorption led to blockage of the biochar's micropores according to N and CO adsorption analyses. Surface chemistry of the biochars was also substantially modified, with more O-rich functional groups on the aged biochars compared to the original biochars, as evidenced by Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses. The changes in both the physical and chemical surface properties of biochars by DOC led to significant attenuation of the sorption capacity and nonlinearity of the nonionic organic compounds on the aged biochars. Among the tested organic compounds, phenanthrene was the most attenuated in its sorption by the aging treatments, possibly because of its relatively large molecular size and hydrophobicity. The information can help gain a mechanistic understanding of interactions between BCs and organic compounds in soil environment.

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“…In comparison, the Kd value in deionized water, in the absence humic acid, under the same initial conditions was ~6.910 4 L kg -1 (SD, 3.7×10 3 ). This indicated that humic acid yielded a negative influence on the sorptive removal of chloramphenicol which can be explained by the direct competition of humic acid and fBC sorption sites for the sorption of chloramphenicol (Zhang et al, 2015;Pignatello et al, 2006). Pignatello et al (2006) found that natural organic substances (e.g.…”

Section: Effects Of Humic Acid Salt and Soil Concentration On Kdmentioning

confidence: 99%

Chloramphenicol interaction with functionalized biochar in water: sorptive mechanism, molecular imprinting effect and repeatable application

Ahmed

Zhou

Ngo

et al. 2017

Science of The Total Environment

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Biochar and functionalized biochar (fBC-1 and fBC-2) were prepared and applied to remove antibiotic chloramphenicol from deionized water, lake water and synthetic wastewater. Results showed that chloramphenicol removal on biochar was pH dependent and maximum sorption occurred at pH4.0-4.5. The sorption data of chloramphenicol fitted better with the Langmuir isotherm model than the Freundlich isotherm model with the maximum Langmuir sorption capacity of 233μMg using fBC-2. Chloramphenicol sorption on fBC-2 followed the trend: deionized water>lake water>synthetic wastewater. The presence of humic acid decreased the sorption distribution coefficient (K) while the presence of low ionic strength and soil in solution increased K value significantly. The mechanism of sorption on fBC mainly involved electron-donor-acceptor (EDA) interactions at pH<2.0; formation of charge assisted hydrogen bond (CAHB) and hydrogen bonds in addition to EDA in the pH4.0-4.5; and CAHB and EDA interactions at pH>7.0. Additionally, solvent and thermal regeneration of fBC-2 for repeatable applications showed excellent sorption of chloramphenicol under the same condition, due to the creation of a molecular imprinting effect in fBC-2. Consequently, fBC-2 can be applied with excellent reusability properties to remove chloramphenicol and other similar organic contaminants.

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Impact of humic acid coating on sorption of naphthalene by biochars

Cited by 38 publications

References 54 publications

Predicting the effect of dissolved humic acid on sorption of benzotriazole to biochar

Predicting the effect of dissolved humic acid on sorption of benzotriazole to biochar

Insights into the attenuated sorption of organic compounds on black carbon aged in soil

Chloramphenicol interaction with functionalized biochar in water: sorptive mechanism, molecular imprinting effect and repeatable application

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