Removal mechanism for chromium (VI) in groundwater with cost-effective iron-air fuel cell electrocoagulation

Maitlo, Hubdar Ali; Kim, Ki‐Hyun; Park, Joo Yang; Kim, Junghwan

doi:10.1016/j.seppur.2018.12.058

Cited by 36 publications

(11 citation statements)

References 100 publications

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“…Figure 6 shows the fitting curve between the experimental data and the calculated values at different temperatures, and the regression coefficient R 2 is given in Table 2. Table 2 shows that Equation (7) was found to better fit all of the arsenic removal temperatures, and the correlation coefficient was much higher than those of Equations (6) and (8). Therefore, it could be considered that the chemical reaction of ZVI combined with CuSO4 to remove arsenic from waste acid was a residual layer diffusion control step.…”

Section: Kinetic Model Of Arsenic Removalmentioning

confidence: 99%

“…Generally, arsenic exists in aquatic environments in its inorganic forms, including arsenite As (III) and arsenate As (V). Nowadays, increasing numbers of scientists around the world are making great efforts to reduce the arsenic concentration in groundwater, drinking water, and wastewater, and to find the most efficient and cost-effective methods for arsenic removal [4,6].…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Arsenic Removal in Waste Acid by the Combination of CuSO4 and Zero-Valent Iron

Luo

Zou

et al. 2019

Processes

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In this study, we investigated the kinetics of arsenic removal from waste acid by the combination of zero-valent iron (ZVI) and CuSO4. ZVI samples were characterized by X-ray diffraction and scanning electron microscopy before and after arsenic removal; the results showed that after the arsenic removal reaction, As2O3 and magnetite phases were detected on the surface of these samples. Kinetic studies were carried out under different reaction temperatures, with different CuSO4 concentrations, and with different iron to arsenic molar ratios (Fe/As). The kinetic data of the arsenic removal were fitted to different kinetic models. The fitting results showed that the arsenic removal process could be described by the shrinking core model, controlled by residual layer diffusion. The apparent activation energy of the reaction was 9.0628 kJ/mol, the reaction order with the CuSO4 concentrations was −0.12681, and the reaction order with the molar ratio of iron to arsenic (Fe/As) was 3.152.

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Section: Kinetic Model Of Arsenic Removalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of Arsenic Removal in Waste Acid by the Combination of CuSO4 and Zero-Valent Iron

Luo

Zou

et al. 2019

Processes

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“…However in case of H2SO 4 and NaOH as a strip solution no such precipitation was observed. At high concentration of acid or alkaline solution, oxide or hydroxide layer is formed on iron anode plate which inhibits iron plate for further formation of iron‐hydroxide complex (Kıyak and Kabasakalođlu, 1999; Kolics et al , 1998; Kim et al , 2015; Un et al , 2017; Maitlo et al , 2019). The percent recovery of Cr(VI) in strip phase for H 2 SO 4 and NaOH are 2.58 and 32.90% respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In electrochemical process electric potential is the parameter which controls the rate of electrochemical reaction inside the reactor (Bayramoglu et al, 2004;Daneshvar et al, 2004Daneshvar et al, , 2006Bayar et al 2011;Maitlo et al, 2019). The %extraction and %precipitation of chromium were measured by varying electric potential within the range the of 0.5 to 4 V DC inside the strip phase.…”

Section: Effect Of Electric Potential Across the Electrodesmentioning

confidence: 99%

Removal of hexavalent chromium from wastewater using supported liquid membrane: synthesis of chromium‐iron complex through electrochemical reaction

Mondal

Saha

2020

Water & Environment J

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Treatment of wastewater containing hexavalent chromium is the issue in this research. Supported liquid membrane with in situ electrochemical reaction in stripping section helps to reduce hexavalent chromium to trivalent chromium by forming chromium-iron complex. Iron plate acts as anode in stripping section. The chromium-iron complex is an useful value added product that can be used for various purposes such as catalyst in water-gas shift reaction. Aliquat 336 has been used as carrier for transport of hexavalent chromium. Various physicochemical parameters have been optimised to detect the condition of maximum transport and precipitation of chromium-iron complex in stripping phase. The important physico-chemical parameters such as strip phase concentration, strip phase pH and concentration of carrier (% v/v) in Liquid Membrane have been selected through response surface methodology to obtain optimum performance for %precipitation of chromium.

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“…According to EWG, at least 74 million people in nearly 7000 C 2021, 7, 27. https://doi.org/10.3390/c7010027 https://www.mdpi.com/journal/carbon C 2021, 7, 27 2 of 15 communities drink tap water polluted with "total chromium," which includes hexavalent and other forms of the metal [3]. Most common treatment options for Cr (VI) include ion exchange [4,5], reverse osmosis [6], membrane separation process [7][8][9], reduction-precipitation [5,10], electrochemical processes [11,12], biosorption [13,14], and adsorption with activated carbon [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Amongst these methods, the advantages of using adsorption with activated carbon include method simplicity, cost-effectiveness, and ability for regeneration [1,19].…”

Section: Introductionmentioning

confidence: 99%

The Role of Surface Chemistry and Polyethylenimine Grafting in the Removal of Cr (VI) by Activated Carbons from Cashew Nut Shells

Smith

Rivera

Bello

et al. 2021

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Activated carbons prepared from cashew nut shells and modified by grafting polyethylenimine onto the surface were tested for removal of Cr (VI). The removal efficiency of carbons without and with polyethylenimine decreased with an increase in pH, with maximum efficiency found at pH 2. The average maximum adsorption capacities of carbons were calculated to be 340 ± 20 mg/g and 320 ± 20 mg/g for unmodified and modified carbons, respectively. Surface characterization of carbons revealed that C–O functionalities are actively involved in both polyethylenimine grafting and Cr (VI) removal. Moreover, lactone groups and amides, formed by polyethylenimine grafting, seemingly undergo acid hydrolysis with formation of phenol and carboxylic groups. Considering that Cr (III) is the only form of chromium found on the surface of both carbons, the reduction mechanism is deduced as the predominant one. Here Cr (VI), majorly present as HCrO4¯, is attracted to the positively charged carbon surface, reduced to Cr (III) by phenol groups, and adsorbed inside the pores. The mechanism of Cr (VI) removal appears to be similar for unmodified and modified carbons, where the smaller adsorption capacity of the latter one can be related to steric hindrance and pore inaccessibility.

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Removal mechanism for chromium (VI) in groundwater with cost-effective iron-air fuel cell electrocoagulation

Cited by 36 publications

References 100 publications

Kinetics of Arsenic Removal in Waste Acid by the Combination of CuSO4 and Zero-Valent Iron

Kinetics of Arsenic Removal in Waste Acid by the Combination of CuSO4 and Zero-Valent Iron

Removal of hexavalent chromium from wastewater using supported liquid membrane: synthesis of chromium‐iron complex through electrochemical reaction

The Role of Surface Chemistry and Polyethylenimine Grafting in the Removal of Cr (VI) by Activated Carbons from Cashew Nut Shells

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