title: Role of Alumina and Montmorillonite in Changing the Sorption of Herbicides to Biochars.
abstract: The influence of biochars on the fate of herbicides in soil depends mostly on environmental factors among which the role of soil minerals is not clear. Two wood-derived biochars produced at 400 °C (BC400) and 600 °C (BC600) were treated with alumina and montmorillonite to investigate their interaction with biochars and the influence of herbicide sorption. Both minerals exhibited a pore-expanding effect that was likely relative to the removal of authigenic organic matter away from the biochars' surface. Alumina brought more remarkable pore expansion by doubling the surface area of the BC400 biochar and the mesopore area of the BC600 biochar. Consequently, more adsorption sites were accessible for herbicide molecules, which resulted in higher sorption of herbicides (acetochlor and metribuzin) to the mineral-treated biochars than to the untreated biochars. The results are useful for understanding the change of surface and sorption properties of biochars with soil applications.
authors.affiliation: Department of Chemistry, Shaoxing University, Zhejiang 312000, China.
authors.forename: Jianfa
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Chemistry, Shaoxing University, Zhejiang 312000, China.
authors.forename: Saijun
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Chemistry, Shaoxing University, Zhejiang 312000, China.
authors.forename: Huaping
authors.initials: H
authors.lastname: Dong
authors.affiliation: Department of Chemistry, Shaoxing University, Zhejiang 312000, China.
authors.forename: Shengshuang
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Chemistry, Shaoxing University, Zhejiang 312000, China.
authors.forename: Yimin
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemistry, Shaoxing University, Zhejiang 312000, China.
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Zhong
mesh_terms: D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry
chemical_list: D006540:Herbicides; D012989:Soil Pollutants; C540010:biochar; D001546:Bentonite; D002606:Charcoal; D000537:Aluminum Oxide
keywords: biochar; pesticide; porosity; soil mineral; sorption