Removal of Cr(VI) using iron nanoparticles supported on porous cation-exchange resin

Ali, Syed Wasim; Mirza, Misbah; Bhatti, Tariq M.

doi:10.1016/j.hydromet.2015.07.013

Cited by 36 publications

(24 citation statements)

References 35 publications

(51 reference statements)

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“…Precipitation and adsorption processes are economic and effective, but only efficient when the Cr(VI) concentration is relatively high (Abyaneh and Fazaelipoor 2016 ; Hokkanen et al 2016 ). Ion exchange is high-efficiency in general, but it is rather expensive to maintain and operate (Ali et al 2015 ). Some even cause secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

et al. 2016

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In this work, we report on the synthesis of nitrogen doped SrTiO3 nanoparticles with efficient visible light driven photocatalytic activity toward Cr(VI) by the solvothermal method. The samples are carefully characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy and photocatalytic test. It is found that nitrogen doping in SrTiO3 lattice led to an apparent lattice expansion, particle size reduction as well as subsequent increase of Brunner–Emmet–Teller surface area. The visible light absorption edge and intensity can be modulated by nitrogen doping content, which absorption edge extends to about 600 nm. Moreover, nitrogen doping can not only modulate the visible light absorption feature, but also have consequence on the enhancement of charge separation efficiency, which can promote the photocatalytic activity. With well controlled particle size, Brunner–Emmet–Teller surface area, and electronic structure via nitrogen doping, the photocatalytic performance toward Cr(VI) reduction of nitrogen doped SrTiO3 was optimized at initial hexamethylenetetramine content of 2.Electronic supplementary materialThe online version of this article (doi:10.1186/s40064-016-2804-2) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

et al. 2016

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“…Ali et al studied the removal of Cr(VI) using iron nanoparticles supported on a porous cation-exchange resin. 15 The process involves a separate procedure for the preparation of iron nanoparticles and their dispersion on a polymer support. In another approach, Pd supported on amine-functionalized SiO 2 yielded efficient conversion of Cr(VI).…”

Section: Resultsmentioning

confidence: 99%

“…6,9 Reduction of Cr(VI) to Cr(III) is reported to be achieved chemically, biologically, and photochemically. 10−15 Biotreatments are considered to be cost-effective and environmentally friendly; however, such methods are generally slow. Considering the chemical route, which is generally a viable method, most of the recent protocols involve costly chemicals such as Pd- and Pt-containing systems, complex catalyst preparation steps, and long duration.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the chemical route, which is generally a viable method, most of the recent protocols involve costly chemicals such as Pd- and Pt-containing systems, complex catalyst preparation steps, and long duration. 6,15,16 Such processes focus mainly on the reduction of Cr(VI) and in general have not addressed the secondary waste accumulation. The current study focused on the usage of a cost-effective material for the reduction of Cr(VI) and in addition addressed the transformation of accumulating secondary waste.…”

Section: Introductionmentioning

confidence: 99%

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Integrated Approach for Hazardous Cr(VI) Removal: Reduction, Extraction, and Conversion into a Photoactive Composite, CuO/CuCr₂O₄

Gopal

Gupta

2019

ACS Omega

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The present study reports on CuO-assisted reduction of Cr(VI) under ambient conditions using sodium borohydride and its complete removal. The confirmation of the reductive removal of Cr(VI) was assisted by powder X-ray diffraction, Fourier transform infrared, scanning electron microscopy, mic absorption spectro, UV–vis, and UV–vis–diffuse reflectance spectroscopy techniques. The analysis revealed that the process involved adsorption of dichromate ion on the surface of copper oxide, reduction of Cr(VI), and precipitation of Cr(III) as its hydroxide. Cr(VI) reduction capacity of CuO was found to be around 27.2 mmol/(g h). The residue collected showed promising reusability for 3 to 4 cycles, and the exhausted residue was finally converted into a black composite, CuO/CuCr2O4. The composite showed positive response for the photodegradation of methyl orange. Thus, the current protocol proposed a complete package of cost-effective reduction of Cr(VI) to Cr(III), precipitation into its hydroxide, and the conversion of the residue into a photoactive composite.

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“…Cr(VI) species are about 100 times more toxic than Cr(III) species, because Cr(VI) is easily adsorbed in the stomach and accumulated in the kidney and liver (Chen et al, 2018). Alternatively, low Cr(III) levels are essential to mammalian life (Ali et al, 2015). e World Health Organization (WHO) has stipulated the maximum concentration of Cr(VI) in drinking water as 0.05 mg L −1 (World Health Organization, 2017).…”

Section: Introductionmentioning

confidence: 99%

Reductive Adsorption of Chromium(VI) by Coal-Based Activated Carbon

Hoang

Lin

Nishihama

et al. 2020

J. Chem. Eng. Japan / JCEJ

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Cr(VI) has been con rmed as a toxic carcinogenic contaminant; consequently, it must be removed from wastewater pipes prior to discharge. In the present work, the reductive adsorption of Cr(VI) was investigated using coal-based activated carbon. Batchwise reductive adsorption and chromatography study of Cr(VI) were carried out, with varying parameters, such as pH, time, initial concentration, and temperature. The Cr(VI) species adsorbed on the activated carbon were immediately reduced to Cr(III), such that only Cr(III) was observed. The reductive adsorption followed the Langmuir adsorption model, and the highest adsorption capacity of 3.43 mmol g 1 was obtained at an equilibrium pH of 2.04. Thermodynamic studies indicated that the adsorption process was endothermic. The reductive adsorption kinetics were controlled by the adsorption step and expressed by the pseudo-second-order kinetic model. The chromatographic recovery of Cr(VI) using the activated carbon was achieved at a feed pH of 3.0 until a bed volume of 500 was achieved, although the elution of the loaded Cr was di cult.

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Removal of Cr(VI) using iron nanoparticles supported on porous cation-exchange resin

Cited by 36 publications

References 35 publications

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Integrated Approach for Hazardous Cr(VI) Removal: Reduction, Extraction, and Conversion into a Photoactive Composite, CuO/CuCr₂O₄

Reductive Adsorption of Chromium(VI) by Coal-Based Activated Carbon

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Removal of Cr(VI) using iron nanoparticles supported on porous cation-exchange resin

Cited by 36 publications

References 35 publications

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Hydrothermal derived nitrogen doped SrTiO3 for efficient visible light driven photocatalytic reduction of chromium(VI)

Integrated Approach for Hazardous Cr(VI) Removal: Reduction, Extraction, and Conversion into a Photoactive Composite, CuO/CuCr2O4

Reductive Adsorption of Chromium(VI) by Coal-Based Activated Carbon

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Integrated Approach for Hazardous Cr(VI) Removal: Reduction, Extraction, and Conversion into a Photoactive Composite, CuO/CuCr₂O₄