Facile modification of nanoscale zero-valent iron with high stability for Cr(VI) remediation

Peng, Ziling; Xiong, Chunmei; Wang, Wei; Tan, Fatang; Xu, Yang; Wang, Xinyun; Qiao, Xueliang

doi:10.1016/j.scitotenv.2017.04.121

Cited by 85 publications

(17 citation statements)

References 48 publications

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“…After calcination and functionalization, bands due to CTAB is absent from spectra and 3 distinctive peaks at 454, 845 and 1084 cm − respectively. The obtained results of FT-IR confirmed the successful surface loading of Nano-SiO2 with folic acid to form Nano-SiO2-FA [29][30][31].…”

Section: Ft-ir Analysissupporting

confidence: 65%

Separation/Preconcentration of Al(III) from Water Samples via Sorptive-flotation Technique Using Silica Nanoparticles Modified with Folic Acid

Youssef¹

2020

Rev. Chim.

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In the present work, silica nanoparticles functionalized with folic acid (Nano-SiO2-FA) were synthesized and characterized thru elemental analysis, infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET) surface area determination, and scanning electron microscope (SEM). Nano-SiO2-FA was examined as a sustainable and promising sorbent for preconcentration of Al(III) from natural water samples by sorptive-flotation (SF) separation technique before its determination by flame atomic absorption spectrometry (FAAS). A several trials were made in lab, to determine the feasibility of using Nano-SiO2-FA as a sorbent and oleic acid as a surfactant. The influence of: solution pH, temperature, shaking time, surfactant, sorbent and Al(III) concentration and the presence of foreign ions that affect the sorptive-flotation process were investigated. Good results attained under optimum circumstances, at pH 3.5 and ~25�C, according to which nearly 100% of aluminum was separated. The procedure was successfully applied to recover aluminum spiked to some natural water samples. Moreover, a sorption and flotation mechanism is suggested.

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Section: Ft-ir Analysissupporting

confidence: 65%

Separation/Preconcentration of Al(III) from Water Samples via Sorptive-flotation Technique Using Silica Nanoparticles Modified with Folic Acid

Youssef¹

2020

Rev. Chim.

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“…Hexavalent chromium Cr(VI)-a strong oxidizing agent-is a highly toxic chemical that can potentially cause dangerous health outcomes because of its carcinogenic and mutagenic nature and therefore, Cr(VI) removal from water requires urgent attention. As reported in the litearture, Cr(VI) anion in solution entirely/partly reduces to Cr(III) cation when it makes contact with an adsorbent's surface, for instance: natural biomaterial [14], amino-functionalized mesoporous ordered silica adsorbents [15], activated carbon [16], biochar [17], and nanoscale zero-valent iron modified with tetraethyl-ortho-silicate and hexadecyl-trimethoxy-silane [18]. Such an adsorbent can adsorb the reduced Cr(III) through various interactions (i.e., complexation).…”

Section: Introductionmentioning

confidence: 82%

Adsorption mechanism of hexavalent chromium onto layered double hydroxides-based adsorbents: A systematic in-depth review

Tran

Nguyễn

et al. 2019

Journal of Hazardous Materials

197

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An attempt has been made in this review to provide some insights into the possible adsorption mechanisms of hexavalent chromium onto layered double hydroxides-based adsorbents by critically examining the past and present literature. Layered double hydroxides (LDH) nanomaterials are typical dual-electronic adsorbents because they exhibit positively charged external surfaces and abundant interlayer anions. A high positive zeta potential value indicates that LDH has a high affinity to Cr(VI) anions in solution through electrostatic attraction. The host interlayer anions (i.e., Cl -, NO3 -, SO4 2-, and CO3 2-) provide a high anion exchange capacity (53-520 meq/100g) which is expected to have an excellent exchangeable capacity to Cr(VI) oxyanions in water. Regarding the adsorptioncoupled reduction mechanism, when Cr(VI) anions make contact with the electron-donor groups in the LDH, they are partly reduced to Cr(III) cations. The reduced Cr(III) cations are then adsorbed by LDH via numerous interactions, such as isomorphic substitution and complexation. Nonetheless, the adsorption-coupled reduction mechanism is greatly dependent on: (1) the nature of divalent and trivalent salts utilized in LDH preparation, and (2) the types of interlayer anions (i.e., guest intercalated organic anions). The low Brunauer-Emmett-Teller specific surface area of LDH (1.80-179 m 2 /g) suggests that pore filling played an insignificant role in Cr(VI) adsorption. The Langmuir maximum adsorption capacity of LDH (Q o max) toward Cr(VI) was significantly affected by the used inorganic salt natures and synthetic methods of LDH. The Q o max values range from 16.3 mg/g to 726 mg/g. Almost all adsorption processes of Cr(VI) by LDH-based adsorbent occur spontaneously (∆G° <0) and endothermically (∆H° >0) and increase the randomness (∆S° >0) in the system. Thus LDH has much potential as a material that can effectively remove anion pollutants, especially Cr(VI) anions in industrial wastewater.

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“…When Fe 2+ reduces Cr(VI) in the soil suspension to Cr(III), Cr(III) can combine with OHin the soil suspension to form Cr (OH) 3 , while Fe 2+ is oxidized to Fe 3+ , and Fe 3+ combines with free OHto form Fe(OH) 3 . Finally, both of them combine with Cr(III) in the soil suspension to form a Fe(III)-Cr(III) complex to remediate Cr(VI)-contaminated soil [101].…”

Section: Other Interaction Mechanismmentioning

confidence: 99%

Application of nanoscale zero-valent iron in hexavalent chromium-contaminated soil: A review

Chen

et al. 2020

Nanotechnology Reviews

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Chromium (Cr) is a common toxic heavy metal that is widely used in all kinds of industries, causing a series of environmental problems. Nanoscale zero- valent iron (nZVI) is considered to be an ideal remediation material for contaminated soil, especially for heavy metal pollutants. As a material of low toxicity and good activity, nZVI has been widely applied in the in situ remediation of soil hexavalent chromium (Cr(vi)) with mobility and toxicity in recent years. In this paper, some current technologies for the preparation of nZVI are summarized and the remediation mechanism of Cr(vi)-contaminated soil is proposed. Five classified modified nZVI materials are introduced and their remediation processes in Cr(vi)-contaminated soil are summarized. Key factors affecting the remediation of Cr(vi)-contaminated soil by nZVI are studied. Interaction mechanisms between nZVI-based materials and Cr(vi) are explored. This study provides a comprehensive review of the nZVI materials for the remediation of Cr(vi)-contaminated soil, which is conducive to reducing soil pollution.

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Facile modification of nanoscale zero-valent iron with high stability for Cr(VI) remediation

Cited by 85 publications

References 48 publications

Separation/Preconcentration of Al(III) from Water Samples via Sorptive-flotation Technique Using Silica Nanoparticles Modified with Folic Acid

Separation/Preconcentration of Al(III) from Water Samples via Sorptive-flotation Technique Using Silica Nanoparticles Modified with Folic Acid

Adsorption mechanism of hexavalent chromium onto layered double hydroxides-based adsorbents: A systematic in-depth review

Application of nanoscale zero-valent iron in hexavalent chromium-contaminated soil: A review

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