Effective removal of inorganic mercury and methylmercury from aqueous solution using novel thiol-functionalized graphene oxide/Fe-Mn composite

Huang, Yao Hui; Gong, Yanyan; Tang, Jingchun; Xia, Siyu

doi:10.1016/j.jhazmat.2018.11.074

Cited by 94 publications

(24 citation statements)

References 52 publications

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“…For Cd 2+ -and Pb 2+ -laden RS, the decrease in thiol groups from 42% to 29% and 27%, were ascribed to the interactions between thiol groups and Cd 2+ or Pb 2+ , respectively. Similarly, found that thiol groups on thiol-functionalized graphene oxide/Fe-Mn composite decreased by 30% and 10%, respectively, after Hg 2+ and CH3Hg + adsorption, indicating surface complexation [78] . Fig.…”

Section: Sorption Mechanismmentioning

confidence: 87%

Remediation of cadmium and lead polluted soil using thiol-modified biochar

Fan

Cai

Chi

et al. 2020

Journal of Hazardous Materials

215

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Thiol-modified rice straw biochar (RS) was prepared by an esterification reaction with βmercaptoethanol and used for the remediation of Cd and Pb polluted soils. Modified biochar was characterized through elemental analysis, BET analysis, FE-SEM, FT-IR and XPS. These analyticalcharacterizations confirmed that the thiol groups were successfully grafted onto the surface of the biochar and were involved in the metal ion complexation. The batch sorption experiments showed that Cd 2+ and Pb 2+ sorption onto RS followed a pseudo second order kinetic model and a Langmuir isotherm. The maximum adsorption capacities for Cd 2+ and Pb 2+ were 45.1 and 61.4 mg g -1 , respectively in the single-metal systems. In contrast, Cd 2+ was selectively adsorbed over Pb 2+ by RS in the binary-metal systems. Both Cd 2+ and Pb 2+ were mainly removed through surface complexation. The soil incubation experiments further showed that RS reduced the available Cd concentrations up to 40% while available Pb concentrations was reduced up to 11%. Overall, this study demonstrates thiol-modified biochar can effectively enhance the remediation of heavy metal polluted soils.

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Section: Sorption Mechanismmentioning

confidence: 87%

Remediation of cadmium and lead polluted soil using thiol-modified biochar

Fan

Cai

Chi

et al. 2020

Journal of Hazardous Materials

215

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“…High adsorption capacities of mercury in the range of 168-700 mg/g have been obtained with different graphene composites [36,47,[129][130][131][132][133][134][135]. The synthesis process of 2, 20-dipyridylamine (DPA) was a simple precipitation in the presence of nitrogen gas.…”

Section: Mercury Removalmentioning

confidence: 99%

Recent Advances in Applications of Hybrid Graphene Materials for Metals Removal from Wastewater

2020

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The presence of traces of heavy metals in wastewater causes adverse health effects on humans and the ecosystem. Adsorption is a low cost and eco-friendly method for the removal of low concentrations of heavy metals from wastewater streams. Over the past several years, graphene-based materials have been researched as exceptional adsorbents. In this review, the applications of graphene oxide (GO), reduce graphene oxide (rGO), and graphene-based nanocomposites (GNCs) for the removal of various metals are analyzed. Firstly, the common synthesis routes for GO, rGO, and GNCs are discussed. Secondly, the available literature on the adsorption of heavy metals including arsenic, lead, cadmium, nickel, mercury, chromium and copper using graphene-based materials are reviewed and analyzed. The adsorption isotherms, kinetics, capacity, and removal efficiency for each metal on different graphene materials, as well as the effects of the synthesis method and the adsorption process conditions on the recyclability of the graphene materials, are discussed. Finally, future perspectives and trends in the field are also highlighted.

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“…Indeed, strong affinities between APDC and mercury, mainly due to the presence of thiol groups (R-SH) in the structure of APDC, lead to the chelation of mercury by APDC (covalent bonds) [33]. -SH groups have already shown one of the strongest binding affinity either for inorganic mercury (sulphur-containing organic matter or polymers with Hg(II)) or organic mercury (sulphur-containing organo-metallic compounds or thiolate-like species with MeHg) [29]. We also need to add some Triton-X-100 in the nanoparticles suspension to increase the viscosity of the solution, hence improving the buoyancy of graphene nanosheets and, in this way, to obtain a real suspension of nanoparticles.…”

Section: Preparation Of Nanoparticles Suspensionmentioning

confidence: 99%

“…Finally, reproducible production of the nanogold-coated dipsticks remains difficult. As an alternative to expensive gold materials, Tavares et al [27] have produced magnetite nanoparticles using iron oxide nanoparticles coated with silica shells functionalized with dithiocarbamate groups in order to take advantage of the strong affinities between Hg and thiol group (R-SH) [28,29] , reached with this procedure prevents its application in pristine areas.…”

Section: Introductionmentioning

confidence: 99%