Reducing Hexavalent Chromium to Trivalent Chromium with Zero Chemical Footprint: Borohydride Exchange Resin and a Polymer-Supported Base

Regan, J.T.; Dushaj, Nicholas; Stinchfield, Georgia

doi:10.1021/acsomega.9b01194

Cited by 26 publications

(12 citation statements)

References 23 publications

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“…had been developed for heavy metal removal . Among them, the adsorption approach is among the most popular ones because of the high efficiency, low cost, and easy handling. , To date, numerous facile adsorbents had been developed for the removal of Cr(VI) from water, such as carbonaceous materials, polyaniline-loaded materials, minerals, and ion exchange. − However, unsustainability and low adsorption capacity remain a major challenge for these materials. With the increasing emphasis on sustainability, researchers are recently shifting toward using high performance environmental-friendly renewable biobased adsorbent materials for the removal of toxic Cr(VI) from water.…”

Section: Introductionmentioning

confidence: 99%

Cationic Dialdehyde Nanocellulose from Sugarcane Bagasse for Efficient Chromium(VI) Removal

Huang

Dognani

Hadi

et al. 2020

ACS Sustainable Chem. Eng.

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Cellulose-based materials are the most widely used green materials because of their abundance, sustainability, biodegradability, and functionalizability. The capability of cellulosic materials as adsorbents and coagulants to remove negatively charged contaminants from water requires the possession of a positively charged functionality. In this study, cationic dialdehyde cellulose (c-DAC) nanofibers with three different degrees of oxidation were created by preparing metaperiodate-oxidized cellulose followed by cationization using Girard's reagent T. The resulting c-DAC was applied for the removal of hexavalent chromium (Cr(VI)) ions from water, where the efficiency was evaluated as functions of the initial chromium concentration, adsorption time, pH value, and co-existing anions. It was found that all c-DAC samples showed excellent adsorption efficiencies against Cr(VI), where the c-DAC with the highest charge density exhibited the maximum adsorption capacity of 80.5 mg/g. The Cr(VI) adsorption mechanism is found to be dominated by the electrostatic interactions between the quaternary ammonium cations on the c-DAC surface and Cr(VI) ions and can be best described using the Langmuir model. These samples also exhibited stable adsorption capacity in a wide pH range, where the c-DAC surface could remain positively charged.

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Section: Introductionmentioning

confidence: 99%

Cationic Dialdehyde Nanocellulose from Sugarcane Bagasse for Efficient Chromium(VI) Removal

Huang

Dognani

Hadi

et al. 2020

ACS Sustainable Chem. Eng.

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“…The positive △H 0 value, representing an endothermic reaction, supports the observation that by increasing the temperature of the adsorption process the K c values and initial rate also increase. The relatively small △S 0 value suggests the replacement of CO We have previously observed that the fluid dynamics of resin-based Cr (VI) removal agents, specifically Cr (VI) reduction to Cr (III), contributed to the efficiency of the remediation (Regan et al 2019). Specifically, heterogeneous solutions containing resins that were in motion (stirring) were more efficient than static conditions due to a faster diffusion rate of chromate into the porous cavities.…”

Section: Resultsmentioning

confidence: 99%

Bidentate and Monodentate Binding of Chromium (VI) on the Acid Scavenger Exchange Resin, MP-Carbonate, as a Function of pH

Stinchfield

Capitani

Regan

2020

Water Air Soil Pollut

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Hexavalent chromium or Cr (VI) is a serious health risk that has been identified in drinking water and generally originates as industrial by-products and hazardous waste sites, although natural sources have been reported. Common methods to remove Cr (VI) employ adsorption, filtration, ion exchange technologies, and redox reactions. We report on a macro porous polystyrene anion exchange resin, a solid-supported equivalent of tetra-alkyl ammonium carbonate (Biotage® MP-Carbonate), to effectively remove Cr (VI) from synthetic wastewater with bidentate or monodentate binding modes of chromate, depending on the pH environment. Sorption capacity is pH dependent with 332, 161, and 163 mg CrO 4 2− per gram of MP-Carbonate adsorbed at pH 2, 6.8, and 10, respectively. Experimental data indicate an exergonic and endothermic adsorption process. Static vs. dynamic reaction conditions are discussed. Density functional theory calculations parallel the Gibbs free energy results of the bidentate binding of the large chromate ion compared to carbonate with the ammonium ions. These studies identify the potential uses of MP-Carbonate in the remediation of Cr (VI) wastewater unrelated to the pH of the water source.

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“…Natural conversion of Cr (VI) to Cr (III) in chrome mines area can be done by Live Spirulina platensis on Bio-sorption, adsorptions, ion exchange, or filtration methods. Cr (VI) is available as HCrO 4and chromate at pH > 6.5 but in Groundwater, it is a byproduct of many industrial processes Regan et al [18].…”

Section: Review Of Literaturementioning

confidence: 99%

The Strategies of Chromite Terrace in Sukinda Valley, India: An Appraisal

Mishra

Samal²,

Sohel³

et al. 2022

JSRR

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Iron chrome oxide (FeCr 2O4), is a commercially viable and major ingredient of stainless steel. The Odisha state in India possesses 98% of the pre-Cambrian India’s Chromite ore deposits in Sukinda valley, Jajpur District. To meet the present escalating demand for chromium in steel industries, it is urged to extract more chrome ore to satiate domestic needs. The depletion of chrome deposits, rise in demand, fewer chrome mines, and less conversion from tailings increase of more toxic hexavalent chrome ion level in the geo-bio hydrosphere, shall aggravate health concerns for the people, fauna, and flora in Sukinda Ultramafic Complex (SUC). The present quest is a collection of chromite ores and tailings. A chemical study is done by using the X-ray fluorescent spectrometer. An insitu/GIS study of the Sukinda ultramafic complex by using Arc-GIS, and ERADAS software has been done to originate hydrology, aspect, and hill-shade map of the valley. The literature, and as an inhabitant of the area helped in preparing the strategic plan through Environmental Impact Assessment and Environmental Management Plan. CR (III) is a dietary requirement. The anthropogenic activities and atmospheric exposure have converted Cr (III) to Cr (VI) in SUC and have surpassed the recommended values. The noxious Cr (VI) in the geo-bio-hydrosphere shall invite health and environmental concerns in the future. The aboriginals of SUC are economically burdened with food insecurity, poor livelihood, health, and of formal societal values. The Sukinda Valley ore samples contain 50% chromite ore is economic. But the >7% of CR (III) ore in the tailings and overburden shall warrant the future expected exorbitant Cr (VI) in the geo-bio-hydro environment of Sukinda valley.

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Reducing Hexavalent Chromium to Trivalent Chromium with Zero Chemical Footprint: Borohydride Exchange Resin and a Polymer-Supported Base

Cited by 26 publications

References 23 publications

Cationic Dialdehyde Nanocellulose from Sugarcane Bagasse for Efficient Chromium(VI) Removal

Cationic Dialdehyde Nanocellulose from Sugarcane Bagasse for Efficient Chromium(VI) Removal

Bidentate and Monodentate Binding of Chromium (VI) on the Acid Scavenger Exchange Resin, MP-Carbonate, as a Function of pH

The Strategies of Chromite Terrace in Sukinda Valley, India: An Appraisal

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