Speciation and fate of toxic cadmium in contaminated paddy soils and rice using XANES/EXAFS spectroscopy

Kunene, Sikhumbuzo Charles; Lin, Kuen‐Song; Mdlovu, Ndumiso Vukile; Lin, Yousheng; Mdlovu, Ncobile Bagezile

doi:10.1016/j.jhazmat.2019.121167

Cited by 30 publications

(9 citation statements)

References 50 publications

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“…For example, multipoint laser-induced breakdown spectroscopy (LIBS) could quantitatively ascertain metal concentrations in the gaseous phase online, stipulating a viable approach of revealing HMs. Furthermore, X-ray adsorption spectroscopy such as extended X-ray absorption fine structure (EXAFS) is an accurate analytical technique to study the speciation of HMs in biomass and solid products after the thermochemical process. HMs in biomass should be considered as resources rather than pollutants. Hence, HM management strategies during thermochemical conversion of biomass should be focused more on recovery rather than their removal.…”

Section: Future Research Directions and Perspectivesmentioning

confidence: 99%

Section: Future Research Directions and Perspectivesmentioning

confidence: 99%

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Roles of Heavy Metals during Pyrolysis and Gasification of Metal-Contaminated Waste Biomass: A Review

Raheem

Mangi

et al. 2022

Energy Fuels

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The presence of contaminates (i.e., heavy metals) in biomass through various sources (industrial activities and municipal solid waste) from its growth to end use has become a nuisance. Over the past years, biofuel production from metal-contaminated waste biomasses (MCWBs) has attracted more attention on account of the potential roles in addressing both energy and environmental concerns. This review considers the migration and transfer behaviors of heavy metals into various output streams, including solid products (i.e., biochar), tar and syngas from MCWBs, i.e., contaminated energy crops, plants, industrial wastes, and municipal solid waste, and using thermochemical processes (gasification and pyrolysis). In addition, the authors also shed light on the transfer mechanisms of heavy metals (however, the availability of the literature on the transfer mechanisms of heavy metals during thermal process is very limited) and usability of products (bio-oil, biochar, and syngas), including a comparison of gasification and pyrolysis processes in regard to the conversion of MCWBs into bioenergy. In the end, technoeconomic assessments and future perspectives are presented. This review will be helpful to promote future research and may aid in the scale-up of the current practices to visualize MCWBs as potential opportunities instead of nuisances.

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Section: Future Research Directions and Perspectivesmentioning

confidence: 99%

Section: Future Research Directions and Perspectivesmentioning

confidence: 99%

Roles of Heavy Metals during Pyrolysis and Gasification of Metal-Contaminated Waste Biomass: A Review

Raheem

Mangi

et al. 2022

Energy Fuels

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“…According to recent reports [7,8], Pb(II) and Cd(II) are the most widespread heavy metals in smelting site soils in China. Pb(II) is non-biodegradable and highly carcinogenic [9][10][11], while Cd(II) is highly mobile and toxic [12,13]. Thus, there is an urgent need for timely immobilization of Pb(II) and Cd(II) in smelting site soils using cost-effective agents.…”

Section: Introductionmentioning

confidence: 99%

Potential Mechanism of Long-Term Immobilization of Pb/Cd by Layered Double Hydroxide Doped Chicken-Manure Biochar

Zhang

Liu

Zhang

et al. 2023

IJERPH

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Layered double hydroxide (LDH)-doped chicken-manure biochar (CMB) with long-term stability was synthesized to immobilize Pb/Cd. MgAl-Cl-LDH-doped CMB (MHs) showed prominent long-term oxidation resistance and the least biodegradation sensitivity. Efficient Pb/Cd adsorption was observed on MHs, and the maximum adsorption capacities of Pb(II)/Cd(II) reached 1.95 mmol/g and 0.65 mmol/g, respectively. Precipitation and isomorphous substitution were identified as the key adsorption mechanisms, which formed highly stable Pb/Cd species (PbAl-CO3-LDH, Pb3(OH)2CO3, CdAl-Cl-LDH and CdCO3). Pb(II) and Cd(II) precipitated with CO32− in MHs; meanwhile, Mg(II) and Ca(II) in LDH layers were substituted by Pb(II) and Cd(II) respectively. Therefore, MHs had the potential for long-term stability of Pb/Cd. Moreover, complexation and electrostatic adsorption also contributed to the Pb/Cd immobilization to a certain extent. When 5% MHs (w/w) was applied to Pb/Cd contaminated smelting site soils, the soil pH increased from 5.9 to 7.3. After applying MHs for 25 d, the content of bioavailable Pb(II) and Cd(II) decreased by 98.8% and 85.2%, respectively, and the content of soluble Pb and Cd dropped by 99.5% and 96.7%. This study paves the way for designing a novel LDH doped CMB as efficient Pb/Cd immobilizers for smelting site soils.

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“…12−14 Besides, Cd ions can form cadmium oxides (CdO) and cadmium sulfide (CdS). 15 Se ions are potentially metabolized to selenoamino acids 16 and volatile alkyl selenides. 17 However, no proof has been provided for these transformation hypotheses for CdSe QDs in plant systems.…”

Section: ■ Introductionmentioning

confidence: 99%

Rice Seedlings and Microorganisms Mediate Biotransformation of Se in CdSe/ZnS Quantum Dots to Volatile Alkyl Selenides

Wei,

Liu,

Hou

et al. 2023

Environ. Sci. Technol.

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Speciation and fate of toxic cadmium in contaminated paddy soils and rice using XANES/EXAFS spectroscopy

Cited by 30 publications

References 50 publications

Roles of Heavy Metals during Pyrolysis and Gasification of Metal-Contaminated Waste Biomass: A Review

Roles of Heavy Metals during Pyrolysis and Gasification of Metal-Contaminated Waste Biomass: A Review

Potential Mechanism of Long-Term Immobilization of Pb/Cd by Layered Double Hydroxide Doped Chicken-Manure Biochar

Rice Seedlings and Microorganisms Mediate Biotransformation of Se in CdSe/ZnS Quantum Dots to Volatile Alkyl Selenides

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