Heterogeneous Nucleophilic Transformation of Metolachlor by Bisulfide on Alumina Surface

Wei, Lan; Li, Fangbai; Liu, Chengshuai; Liu, Chuanping; Chen, Manjia; Lan, Qing

doi:10.1002/clen.201200225

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…At this point very little is known whether the interaction of dissolved reduced sulfur nucleophile to mineral surfaces in sediments could enhance the reactivity of the nucleophile and therefore the degradation of contaminants such as THAPs in sediments. One study investigating such interaction reports an increased heterogeneous nucleophilic transformation of a chloroactanilide (metolachlor) by HS − on the surface of alumina (Wei et al, 2013). …”

Section: Introductionmentioning

confidence: 99%

Reactions of three halogenated organophosphorus flame retardants with reduced sulfur species

Saint-Hilaire¹,

Jans²

2013

Chemosphere

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Tris(haloalkyl)phosphates (THAPs) are among the most widely used flame retardants in the U.S. They have been identified as one of the most frequently detected contaminants in U.S. streams. These contaminants are of toxicological concern in sensitive coastal ecosystems such as estuaries and salt marshes. It is likely that reactions with reduced sulfur species such as polysulfides (Sn2−) and bisulfide (HS−), present in anoxic subregions of coastal water bodies could have a significant impact on rates of removal of such contaminants, especially since no significant degradation reactions in the environment (e.g., hydrolysis, biological degradation) is reported for these compounds. The kinetics of the reaction of reduced sulfur species with three structurally related THAPs have been determined in well-defined aqueous solutions under anoxic conditions. Reactions were monitored at varying concentrations of reduced sulfur species to obtain second-order rate constants from the observed pseudo-first order rate constants. The degradation products were studied with GC-FID and LC-MS. The reactivity of Sn2−, thiophenolate, and HS− were compared and steric, as well as electronic factors are used to explain the relative reactivity of the three THAPs with these three sulfur species.

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Section: Introductionmentioning

confidence: 99%

Reactions of three halogenated organophosphorus flame retardants with reduced sulfur species

Saint-Hilaire¹,

Jans²

2013

Chemosphere

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Biochar characteristics produced from rice husks and their sorption properties for the acetanilide herbicide metolachlor

Wei

Huang

et al. 2016

Environ Sci Pollut Res

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Rice husk biochar (RHBC) was prepared for use as adsorbents for the herbicide metolachlor. The characteristics and sorption properties of metolachlor adsorbed by the RHBC prepared at different pyrolysis temperatures were determined by analysis of physico-chemical characteristics, Fourier transform infrared spectroscopy (FTIR), Boehm titration, scanning electron microscopy (SEM), and thermodynamics and kinetics adsorption. With increasing pyrolysis temperature, the RHBC surface area greatly increased (from 2.57 to 53.08 m g). RHBC produced at the highest temperature (750 °C) had the greatest surface area; SEM also showed the formation of a porous surface on RH-750 biochar. The sorption capacity of RHBC also increased significantly with increasing pyrolysis temperature and was characterized by the Freundlich constant K for the adsorption capacity increasing from 125.17-269.46 (pyrolysis at 300 °C) to 339.94-765.24 (pyrolysis at 750 °C). The results indicated that the surface area and pore diameter of RHBC produced with high pyrolysis temperature (i.e., 750 °C) had the greatest impact on the adsorption of metolachlor. The FTIR, Boehm titration, and SEM analysis showed that the greatest number of surface groups were on RHBC produced at the lowest temperature (300 °C). The biochars produced at different pyrolysis temperatures had different mechanisms of adsorbing metolachlor, which exhibited a transition from hydrogen bonds dominant at low pyrolytic temperature to pore-filling dominant at higher pyrolytic temperature.

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Corrosion resistance of anodic coatings studied by scanning microscopy and electrochemical methods

Kubisztal

Stach

et al. 2018

Surface and Coatings Technology

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Heterogeneous Nucleophilic Transformation of Metolachlor by Bisulfide on Alumina Surface

Cited by 3 publications

References 41 publications

Reactions of three halogenated organophosphorus flame retardants with reduced sulfur species

Reactions of three halogenated organophosphorus flame retardants with reduced sulfur species

Biochar characteristics produced from rice husks and their sorption properties for the acetanilide herbicide metolachlor

Corrosion resistance of anodic coatings studied by scanning microscopy and electrochemical methods

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