Rapid reduction of Cr(VI) coupling with efficient removal of total chromium in the coexistence of Zn(0) and silica gel

Guo, Jing; Liu, Ying; Dai, Runan; Lan, Yeqing

doi:10.1016/j.jhazmat.2012.10.028

Cited by 38 publications

(13 citation statements)

References 40 publications

(66 reference statements)

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“…In recent years, a number of chemical reductants, including ferrous iron (Seaman et al, 1999;Fendorf and Li, 1996;Buerge and Hug, 1997), zerovalent iron (Puls et al, 1999;Melitas et al, 2001;Zhou et al, 2008), reduced sulfur compounds (Thornton and Amonette, 1999;Lan et al, 2005Lan et al, , 2006, organic compounds Palmer, 1995, 1996a;Deng and Stone, 1996) and others (Xu et al, 2004Guo et al, 2012;Lee et al, 2013) have been utilized to convert Cr(VI) into Cr(III). Among these reductants, Fe(II) is considered to be most feasible and efficient for reducing Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

Catalytic role of Cu(II) in the reduction of Cr(VI) by citric acid under an irradiation of simulated solar light

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Catalytic role of Cu(II) in the reduction of Cr(VI) by citric acid under an irradiation of simulated solar light

et al. 2015

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“…The presence of hydroxyl groups in the silica gel allows for easy modification for effective performance [77]. These adsorbents are considered advantageous as they possess a defined pore geometry, large surface area, high porosity, good mechanical strength, high thermal resistance, stability in a wide range of pH, and are insoluble in water, environmentally benign and cost low [78,79]. Kumar et al [80] used aniline formaldehyde condensate (AFC) as the functional organic group to be attached on the silica backbone and reported 85% removal of Cr(VI) and 70% removal of total chromium (Cr(VI) and Cr(III)), while also reporting 56% recovery of chromium from the adsorbent in the presence of NaOH.…”

Section: Conventional Processes For Chromium Remediationmentioning

confidence: 99%

“…For example, granular zero-valent zinc was used along with the silica gel to satisfactory results. Silica gel prevents the formation of a passivating film on the surface of the zerovalent zinc particles [79].…”

Section: Conventional Processes For Chromium Remediationmentioning

confidence: 99%

Removal of chromium from industrial effluents using nanotechnology: a review

Mitra

Sarkar

Sen

2017

Nanotechnol. Environ. Eng.

132

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The presence of chromium in industrial effluents has become a huge problem worldwide as hexavalent chromium is highly toxic to animals due to its ability to generate reactive oxygen species in cells. The trivalent state of chromium, on the other hand, is significantly less toxic and also serves as an essential element in trace amounts. When industries such as electroplating, tannery, dyeing and others release their effluents into water bodies, hexavalent chromium enters the food chain and, consequently, reaches humans in a biomagnified form. Many remediation processes for removal of hexavalent chromium have been researched and reviewed extensively. These include chemical reduction to trivalent chromium, solvent extraction, chelation and adsorption, among others. It has been generally concluded that adsorption (and/or subsequent reduction) of hexavalent chromium is the best method. However, relatively little is known about the potential of using nanoparticles as adsorbents for the removal of hexavalent chromium from industrial effluents. This method of nanoremediation is more effective than conventional remediation methods and is cost-effective for the industry in the long run. This article reviews the various remediation methods of hexavalent chromium, with emphasis on the field of nanoremediation.

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“…It has been reported that Cr(VI) can be effectively reduced to Cr(III) by many reductants such as zerovalent iron (Puls et al, 1999;Melitas et al, 2001;Zhou et al, 2008), divalent iron (Fendorf and Li, 1996;Buerge and Hug, 1997;Seaman et al, 1999), sulfide (Thornton and Amonette, 1999;Lan et al, 2005Lan et al, , 2006, vitamin C (Xu et al, 2004, zerovalent zinc (Guo et al, 2012), and other minerals . It is known that numerous organic compounds exist in aquatic and soil environments.…”

Section: Introductionmentioning

confidence: 99%

Cu(II) Catalytic Reduction of Cr(VI) by Tartaric Acid Under the Irradiation of Simulated Solar Light

Liu

Qin

Zhang

et al. 2014

Environmental Engineering Science

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Cu(II) catalytic reduction of Cr(VI) by tartaric acid under the irradiation of simulated solar light was investigated through batch experiments at pHs from 3 to 6 and at temperatures from 15°C to 35°C. Results demonstrated that introduction of Cu(II) could markedly improve reduction of Cr(VI) in comparison with tartaric acid alone. Optimal removal of Cr(VI) was achieved at pH 4. Reduction of Cr(VI) increased with increasing temperatures and initial concentrations of Cu(II) and tartaric acid. The catalytic role of Cu(II) in the reduction of Cr(VI) was ascribed to the formation of Cu(II)-tartaric acid complex, which generated active reductive intermediates, including Cu(I) and tartaric acid radicals through a pathway of metal-ligand-electron transfer with light. Cu(II) photocatalytic reduction of Cr(VI) by tartaric acid followed pseudo zero-order kinetics with regard to Cr(VI), and the activation energy was calculated to be 21.48 kJ/mol. To date, such a role of Cu(II) has not been reported. The results from the present study are helpful in fully understanding the photochemical reductive behavior of Cr(VI) in the presence of both tartaric acid and Cu(II) in soil and aquatic environments.

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Rapid reduction of Cr(VI) coupling with efficient removal of total chromium in the coexistence of Zn(0) and silica gel

Cited by 38 publications

References 40 publications

Catalytic role of Cu(II) in the reduction of Cr(VI) by citric acid under an irradiation of simulated solar light

Catalytic role of Cu(II) in the reduction of Cr(VI) by citric acid under an irradiation of simulated solar light

Removal of chromium from industrial effluents using nanotechnology: a review

Cu(II) Catalytic Reduction of Cr(VI) by Tartaric Acid Under the Irradiation of Simulated Solar Light

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