Surface complexation modeling of Cr(VI) adsorption at the goethite–water interface

Xie, Jinyu; Gu, Xueyuan; Tong, Fei; Zhao, Yanping; Tan, Yinyue

doi:10.1016/j.jcis.2015.05.041

Cited by 97 publications

(37 citation statements)

References 39 publications

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“…In this case, the deposited layer consists of Cr(OH) 3 or mixed Cr x Fe 1‐x (OH) 3 . It is known that chromate adsorb on oxide surfaces such as Goethite and TiO 2 , facilitating the film forming redox process.…”

Section: Resultsmentioning

confidence: 99%

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Gomes

Busch²,

Wildlock

et al. 2018

ChemistrySelect

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Chlorate production is a highly energy demanding industrial process, where chlorate formation is accompanied with hydrogen formation on the cathode. To ensure a high cathodic current efficiency, sodium dichromate is added to the chlorate electrolyte to avoid reduction of hypochlorite formed as a reaction intermediate in the process. However, chromate is highly toxic to humans and environment, and therefore a replacement is desired. A model system with ex situ formed chromium oxide/hydroxide films were used to study hypochlorite reduction and hydrogen evolution. The experimental results demonstrate that the hypochlorite reduction is fully blocked while hydrogen evolution readily occurs. However, in the presence of hypochlorite the hydrogen evolution reaction is inhibited. By combining experimental findings with density functional theory (DFT) calculations, the mechanism of hypochlorite reduction was revealed and the reason for inhibition by the deposited chromium(III) film was demonstrated. Based on these results possible replacements for chromate are suggested.

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Section: Resultsmentioning

confidence: 99%

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Gomes

Busch²,

Wildlock

et al. 2018

ChemistrySelect

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“…Although previous studies differ in their perspective on the mechanisms of Cr adsorption onto hydrous ferric oxide and goethite, the adsorption behavior of Cr(VI) are generally well described using a combination of inner-and outer-sphere complexes [20,47,[50][51][52].…”

Section: Combination Of Modeling With Spectroscopic Analyses For Ferrmentioning

confidence: 99%

“…Although SCMs have been extensively used during the last decades by many researchers [10,[15][16][17][18][19][20], accurate datasets for SCMs have not been fully developed due to the complexity of natural systems. There have been some studies related to the development of SCMs for modeling Cr(VI) adsorption mainly on Fe oxyhydroxides.…”

Section: Introductionmentioning

confidence: 99%

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Veselská

Fajgаr

Číhalová

et al. 2016

Journal of Hazardous Materials

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“…[2] In the environment, Cr exists primarily in two oxidation states (III and VI). The two environmentally stable oxidation states, Cr(VI) and Cr(III) exhibit very different toxicities and mobilities.…”

mentioning

confidence: 99%

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe³⁺ impregnated biochar

Hong

Tian

Jiang

et al. 2016

Journal of Dispersion Science and Technology

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Biochar (BC) has been widely used as a low-cost adsorbent for the removal of contaminants from water and soil. However, the adsorption ability of BC towards heavy metal oxyanions (e.g. Cr(VI)) is relatively low due to the negatively charged surface of BC.In this study, pristine BC was impregnated with Fe 3+ to improve its Cr(VI) adsorption capability. Fe 3+ -impregnated BC (Fe 3+ -BC) was successfully synthesized by a simple impregnation method and used for the removal of Cr(VI) from aqueous solution. Various factors affecting the adsorption such as impregnation ratio, pH, adsorbent dosage, contact time, temperature, and the presence of humic acid were investigated in detail. Results showed that Fe 3+ -BC had strong adsorption ability to Cr(VI) with a maximum adsorption capacity of 197.80 mg/g, which were not only significantly higher than that of the pristine Journal of Dispersion Science and Technology 2 BC, but also were superior to many previously reported adsorbents. It was favorable for Cr(VI) adsorption under the condition of acidic and high temperature. The adsorption data obeyed Sips and Langmuir isotherms and the kinetic data were well described by the pseudo-first-order kinetic model. The results herein revealed that the Fe 3+ -impregnated BC had a good potential as a highly efficient material for adsorption of Cr(VI) from aqueous solution. GRAPHICAL ABSTRACT

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Surface complexation modeling of Cr(VI) adsorption at the goethite–water interface

Cited by 97 publications

References 39 publications

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe³⁺ impregnated biochar

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Surface complexation modeling of Cr(VI) adsorption at the goethite–water interface

Cited by 97 publications

References 39 publications

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Understanding Selectivity in the Chlorate Process: A Step towards Efficient Hydrogen Production

Chromate adsorption on selected soil minerals: Surface complexation modeling coupled with spectroscopic investigation

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe3+ impregnated biochar

Contact Info

Product

Resources

About

Highly efficient adsorption of Cr(VI) from aqueous solution by Fe³⁺ impregnated biochar