Joint Assessment of Bioreduction of Chromium(VI) and of Removals of Both Total Chromium and Total Organic Carbon (TOC) in Sequential Hybrid Bioreactors

Crisóstomo, Camilo A.B; Lima, Frederico Alves; Dias, Roseli Mendonça; Cardoso, Vicelma Luiz; Resende, Miriam Maria de

doi:10.1007/s11270-016-2747-9

Cited by 14 publications

(10 citation statements)

References 14 publications

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“…Among the heavy metals, chromium is used in various industrial fields, such as the metallurgical, steel, tannery and cement industries, which are also major emission sources 6 . Chromium discharged from industries is most commonly in the form of trivalent (Cr(III)) or hexavalent (Cr(VI)) chromium in water 7 .…”

Section: Introductionmentioning

confidence: 99%

“…These can also be produced by anthropogenic emissions, such as industrial processes. However, Cr(III) and Cr(VI) have significant differences related to their characteristics, including toxicological and biological properties 6 . Cr(VI) is considered to be a very harmful compound because of its characteristics of being water soluble and carcinogenic 8 .…”

Section: Introductionmentioning

confidence: 99%

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Chromium removal from aqueous solution by a PEI-silica nanocomposite

Choi

Lee

Park

et al. 2018

Sci Rep

116

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It is essential and important to determine the adsorption mechanism as well as removal efficiency when using an adsorption technique to remove toxic heavy metals from wastewater. In this research, the removal efficiency and mechanism of chromium removal by a silica-based nanoparticle were investigated. A PEI-silica nanoparticle was synthesized by a one-pot technique and exhibited uniformly well-dispersed PEI polymers in silica particles. The adsorption capacity of chromium ions was determined by a batch adsorption test, with the PEI-silica nanoparticle having a value of 183.7 mg/g and monolayer sorption. Adsorption of chromium ions was affected by the solution pH and altered the nanoparticle surface chemically. First principles calculations of the adsorption energies for the relevant adsorption configurations and XPS peaks of Cr and N showed that Cr(VI), [HCrO4]− is reduced to two species, Cr(III), CrOH2+ and Cr3+, by an amine group and that Cr(III) and Cr(VI) ions are adsorbed on different functional groups, oxidized N and NH3+.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chromium removal from aqueous solution by a PEI-silica nanocomposite

Choi

Lee

Park

et al. 2018

Sci Rep

116

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“…In the adsorption process, the influence of important parameters including TA content (0-5 wt %), solution pH value (1)(2)(3)(4)(5)(6)(7)(8), and contact time (10-240 min) on the adsorption of Cr(III) ions were researched by immersing 50 mg of nanofibers in Cr(III)-collagen solution in 250 mL flasks. The solution pH value was adjusted by using NaOH or HCl solution (0.1 mol L −1 ).…”

Section: Influential Factors On Adsorption Capacitymentioning

confidence: 99%

“…Chromium wastewater treatment is a focus of attention in industries such as dyeing and finishing, the electroplating industry, battery manufacturing and tanneries [1,2] because chromium ions in effluent can lead to severe environmental and health problems due to their non-biodegradability in living tissues [3][4][5]. Taking into consideration the toxicity of chromium, the maximum contaminant level (MCL) of total Cr in the discharge effluent is set at 1.5 mg L −1 in the leather industry of China.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Zhang

Xue

et al. 2020

Polymers

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Removal of chromium ions is significant due to their toxicity and harmfulness, however it is very difficult to remove trace Cr(III) complexed with organics because of their strong stability. Herein, a novel electrospun polyacrylonitrile (PAN) nanofibers (NF) adsorbent was fabricated and modified by tannic acid (TA) by a facile blend electrospinning approach for removal of trace Cr(III) in an organic complex. Utilizing the large specific area of nanofibers in the membrane and the good affinity of tannic acid on the nanofibers for hydrolyzed collagen by hydrophobic and hydrogen bonds, the as-prepared PAN–TA NFM exhibited good adsorption toward Cr(III)-collagen complexes and effective reduction of total organic carbon in tannage wastewater. The maximal adsorption capacity of Cr(III) is 79.48 mg g−1 which was obtained at the pH of 7.0 and initial Cr(III) concentration of 50 mg g−1. Importantly, the batch adsorption could decrease the Cr(III) concentration from 10–20 mg L−1 to under 1.5 mg L−1, which showed great application potential for the disposal of trace metal ions in organic complexes from wastewater.

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“…Os microrganismos usados remoção e redução biológica de cromo no trabalho de Dias et. al, 2016, é uma cultura mista, e foram utilizados meios simples, porém com certo grau de norteamento devido ao crescimento de determinados microrganismos, por exemplo, caldo nutriente mais indicado para bactérias, YMA normalmente empregado para leveduras e bactérias, Gelose Sabourand-dextrose indicado para leveduras e por último Gelose Czapeck usado comumente para fungos.…”

Section: Introductionunclassified