Electrolytic removal of hexavalent chromium from aqueous solutions

Chaudhary, Abdul J.; Goswami, Nimai C; Grimes, Susan M.

doi:10.1002/jctb.871

Cited by 73 publications

(49 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They reported that 100% Cr reduction took place from synthetic water, while 94-99% was true for tannery water after 2 h electrolysis. Other workers [14] have also described the electrolytic removal of hexavalent chromium from a synthetic solution and from an industrial sample, but they used stainless steel plate and titanium mesh cathodes with a two-steps strategy: (1) electro-reduction of Cr(VI) to Cr(III) in highly acidic medium and (2) electrochemical precipitation of Cr(III) in an alkaline medium. According to their observation, electro-reduction is a clean technology as compared to chemical reduction.…”

Section: Introductionmentioning

confidence: 98%

Electrolytic recovery of chromium salts from tannery wastewater

Sirajuddin

Kakakhel

Lutfullah

et al. 2007

Journal of Hazardous Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 98%

Electrolytic recovery of chromium salts from tannery wastewater

Sirajuddin

Kakakhel

Lutfullah

et al. 2007

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…This process offers detoxification without chemical reducing agents, minimization of salt freight and a lower sludge production. This technology has been under investigation for many years using either planar electrodes [1][2][3][4], mesh type electrodes [3,5] or packed beds with granular carbon [6][7][8][9]. Ibl and Frei [4] reported promising results with two-dimensional electrodes.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical reduction of dilute chromate solutions on carbon felt electrodes

Frenzel¹,

Holdik²,

Barmashenko³

et al. 2005

J Appl Electrochem

View full text Add to dashboard Cite

Carbon felt is a potential material for electrochemical reduction of chromates. Very dilute solutions may be efficiently treated due to its large specific surface area and high porosity. In this work, the up-scaling of this technology is investigated using a new type of separated cell and once-through flow of industrial rinse water. A significant enhancement of the process is obtained due to copper deposition during long-term operation. The co-deposition and re-solution of copper occurs depending on the inlet chromate concentration. When previously deposited copper is present a current-free reduction of chromate takes place resulting in current efficiencies apparently above 100%. Very high space time yields are obtained even for effluents at low concentration and optimised conditions (high flow rates and pH 2). The economic feasibility of the technology is also considered. Continuous, single-pass operation results in lower energy requirements than batch processing. The economic potential of the process is also evaluated in comparison with chemical detoxification of chromate. The operating costs for the electrochemical treatment of very dilute effluents on a carbon felt electrode are 30% lower than for the chemical method.

show abstract

“…These facts can be used for MWCNT as a carbonaceous material and are shown in Equations 4-6. Also, adsorption decrease at higher pH (pH > 5) are expressed due to the formation of soluble hydroxilated complexes (19 …”

Section: Discussionmentioning

confidence: 99%

Hexavalent Chromium Removal From Aqueous Solution Using Functionalized Multi-Walled Carbon Nanotube: Optimization of Parameters by Response Surface Methodology

2015

View full text Add to dashboard Cite

Background: Chromium is one of the most commonly used heavy metals in industry. It is known as a pollutant that its discharge into the environment needs special care. Objectives: The current study aimed to evaluate the functionalized multi-walled carbon nanotubes (f-MWCNTs) as a novel adsorbent of chromium in aqueous solutions. Materials and Methods:The virgin MWCNT was protonated using sulfuric acid as a strong oxidant. The operating conditions such as initial chromium concentration, contact time, adsorbent dosage and pH were evaluated in the adsorption process. A systematic model for chromium adsorption was presented based on the experimental design. Response surface method (RSM), as a mathematical technique, was used for modeling and optimizing considerable parameters. All experiments were performed according to the Standard Methods for the Examination of Water and Wastewater Results: According to the statistical analysis, R 2 (0.998), adjusted R 2 (0.996), prediction R2 (0.906), coefficient of variation (1.38%), and the mean removal efficiency (54.76%) were calculated. Conclusions: The f-MWCNTs can be applied as an adsorbent with excellent properties in the adsorption process. The Efficiency of 61.75% was predicted by the model in the optimum conditions. In the experimental condition an adsorption percentage of 59.44% was obtained.

show abstract

Electrolytic removal of hexavalent chromium from aqueous solutions

Cited by 73 publications

References 18 publications

Electrolytic recovery of chromium salts from tannery wastewater

Electrolytic recovery of chromium salts from tannery wastewater

Electrochemical reduction of dilute chromate solutions on carbon felt electrodes

Hexavalent Chromium Removal From Aqueous Solution Using Functionalized Multi-Walled Carbon Nanotube: Optimization of Parameters by Response Surface Methodology

Contact Info

Product

Resources

About