Speciation analysis and speciation transformation of heavy metal ions in passivation process with thiol-functionalized nano-silica

Zhang, Liwen; Shang, Zhongbo; Guo, Kaixuan; Chang, Zhixian; Liu, Hongling; Li, Deliang

doi:10.1016/j.cej.2019.03.077

Cited by 64 publications

(15 citation statements)

References 37 publications

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“…Unlike other pH-regulating immobilization agents such as biochar and lime, RS addition decreased the soil pH. The thiol groups grafted onto RS enhanced the retention of Cd in soil through the formation of metal complexes and thus the availability of heavy metals was decreased [18] . Similarly, He et al(2018) suggested thiol groups grafted onto palygorskite (MP) decreased available Cd in soil by 90%, and reduced Cd concentrations in pak choi [88] .…”

Section: Effects On Availability Of CD and Pbmentioning

confidence: 99%

“…Although different efficiency, costs and drawbacks have been reported for these technologies, chemical immobilisation has been reported to be a superior choice due to its simplicity, low cost and high efficiency [15] . Chemical immobilisation can decrease mobility and bioavailability of heavy metals through a series of reactions, including ion exchange, adsorption, complexation and precipitation, by adding either organic or inorganic amendments into soil [16][17][18] . To date, a wide range of novel materials have been proposed as immobilization agents, including biochar materials, phosphates-containing materials and Si-rich minerals [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

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

Fan

Cai

Chi

et al. 2020

Journal of Hazardous Materials

237

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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: Effects On Availability Of CD and Pbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Fan

Cai

Chi

et al. 2020

Journal of Hazardous Materials

237

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“…In summary, it can be seen from results of the six immobilisation remediation experiments that the suitable conditions for immobilisation by Fe 3 O 4 @C-COOH in lead-contaminated soil are: AA of 3.3%, pH of 7.33, WC of 50%, conductivity of 142.6 μS•cm -1 , OM of 63.04 g•kg -1 , and an exposure time of no less than 10 days. However, Pb state could be transferred reciprocally and the transformation impacts the toxicity of heavy metal ions in soil [15,[43][44]. Therefore, a leaching toxicity test (TCLP) is an appropriate method to evaluate the stabilization treatment of heavy metal-contaminated soil [8].…”

Section: Fe 3 O 4 @C-cooh Ie By Tclp Test Methodsmentioning

confidence: 99%

Synthesis of Novel Core-Shell Magnetic Fe<sub>3</sub>O<sub>4</sub>@C Nanoparticles with Carboxyl Function for Use as an Immobilisation Agent to Remediate Lead-Contaminated Soils

Ma¹,

Liu²,

Wei³

et al. 2020

Pol. J. Environ. Stud.

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In this study, a carbon shell was coated on Fe 3 O 4 nanoparticles using a hydrothermal method followed by modification of carboxyl end groups on the Fe 3 O 4 @C to form Fe 3 O 4 @C-COOH for creating an immobilisation agent for remediating lead-contaminated soils. The surface of an Fe 3 O 4 @C nanoparticle was successfully covered with carboxyl end groups. The Fe 3 O 4 core possessed the superparamagnetism property; the carbon shell protected the core from being oxidised or dissolved in acid solution, and provided good modifiability. Due to the strong interaction between lead and carboxyl end groups, this synthesised remediation agent exhibited high adsorption capacity. The Fe 3 O 4 @C-COOH nanoparticles principally promoted the transformation of lead (Pb) from a reducible to residual state, while having no obvious effect on the oxidation state of the lead. The amount of Fe 3 O 4 @C-COOH and the composition of soil organic matter had a higher influence on Pb distribution than soil pH, water content, or conductivity. Under optimal immobilisation conditions, the fractionation of the Pb acid-soluble, reducible, oxidative, and residual states in the contaminated soil changed significantly. The leaching and migration of Pb were significantly reduced, thus achieving remediation of lead-contaminated soils by immobilisation. Thus, remediation of lead-contaminated soils via Fe 3 O 4 @C-COOH immobilisation is a potentially practical and technologically feasible method.

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“…Long−term exposure to water which has been contaminated by heavy metals can cause serious harm to human health [3][4][5][6]. Lead ion (Pb 2+ ) is a common pollutant in industrial wastewater, which can cause human dysfunction or serious lesions if ingested in large quantities or for a long time [7,8]. For example, Pb 2+ can cause liver and kidney damage, affect the production of human hemoglobin, damage the human nervous system, cause mental retardation in infants, cause infertility and fetal malformation, etc.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Performance of Amino Functionalized Magnetic Molecular Sieve Adsorbent for Effective Removal of Lead Ion from Aqueous Solution

Guo

Wang

et al. 2021

Nanomaterials

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Lead ion (Pb2+) has high toxicity and brings great harm to human body. It is very important to find an effective method to address lead ion pollution. In this work, amino functionalized CoFe2O4/SBA–15 nanocomposite (NH2–CoFe2O4/SBA–15) was prepared for the effective removal of Pb2+ from aqueous solution. The prepared NH2–CoFe2O4/SBA–15 adsorbent was manifested by using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectrum (FTIR), X-ray powder diffraction (XRD), and Brunauer-Emmett-Teller (BET) analysis. In the meantime, the adsorption conditions, including pH, adsorbent dosage, and adsorption time, were studied. The investigation of adsorption kinetics revealed that the adsorption results conform to the pseudo-first-order kinetic model. The adsorption isotherms research displayed that the adsorption was consistent with the Freundlich model, demonstrating that the adsorption for Pb2+ with the prepared adsorbent was a multimolecular layer adsorption process. In addition, the thermodynamic investigations (ΔG < 0, ΔH > 0, ΔS > 0) demonstrated that the adsorption for Pb2+ with the prepared adsorbent was endothermic and spontaneous. Moreover, the prepared adsorbent showed superior anti-interference performance and reusability, implying the potential application of the adsorbent in actual water treatment. Furthermore, this research may provide a reference and basis for the study of other heavy metal ions.

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Speciation analysis and speciation transformation of heavy metal ions in passivation process with thiol-functionalized nano-silica

Cited by 64 publications

References 37 publications

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

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

Synthesis of Novel Core-Shell Magnetic Fe<sub>3</sub>O<sub>4</sub>@C Nanoparticles with Carboxyl Function for Use as an Immobilisation Agent to Remediate Lead-Contaminated Soils

Adsorption Performance of Amino Functionalized Magnetic Molecular Sieve Adsorbent for Effective Removal of Lead Ion from Aqueous Solution

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