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

Abstract

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.

Dependence of Metolachlor Adsorption by Biochar on Soil Properties in South China

“…Soil minerals and soil organic matter (SOM) are major components that influence the sorption magnitude of organic chemicals, including pesticides. The results of Wu et al [4] showed that the adsorption coefficient was significantly correlated with the SOM content (r = 0.990, p < 0.01). It has also been shown that SOM governs the extent to which sorption processes occur [5].…”

“…This was consistent with the research findings by Paszko The adsorption and leaching behavior of herbicides in soil were mainly affected by the characteristics of the herbicides and the soil's physical and chemical properties. Generally, the higher the content of organic matter in the soil, the stronger its ability to adsorb herbicides [4]. Previous studies have shown that the adsorption of herbicides in soil is mainly influenced by soil organic carbon and mineral contents, but that different herbicides have varying degrees of control in different soils [23].…”

The Importance of the Targeted Design of Biochar Physicochemical Properties in Microbial Inoculation for Improved Agricultural Productivity—A Review

“…Marshall et al [53] reported that biochars derived from grapevine cane at 700 • C can have significantly higher plant-available water content than biochars produced at 500 • C and 23% higher than a typical clay soil. In addition to the importance of high porosity and surface area for the sorption of pollutants such as heavy metals, antibiotics, or pesticides [48], extensive microporous structure may be beneficial for microorganism colonization and organic matter storage [47,54,55].…”

Formable porous biochar loaded with La-Fe(hydr)oxides/montmorillonite for efficient removal of phosphorus in wastewater: process and mechanisms

“…Identifying site energy distribution (SED) of P sorption to La 0.3 Fe 0.1 /MB can provide useful information on sorption mechanisms (Wu et al 2022). The site energy E * of P sorption on La 0.3 Fe 0.1 /MB was calculated from isotherm modeling and Eq.…”