Cr(III) removal from synthetic and real tanning effluents using an electro-precipitation method

Ramírez-Estrada, Alejandro; Mena‐Cervantes, Violeta Y.; Fuentes-García, J. A.; Vazquez‐Arenas, Jorge; Palma‐Goyes, Ricardo E.; Flores‐Vela, A.; Vázquez-Medina, Rubén; Altamirano, Raúl Hernández

doi:10.1016/j.jece.2018.01.038

Cited by 31 publications

(11 citation statements)

References 25 publications

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“…The results reveal that PAN-TA-3 has a potential application to reduce the concentration of trace Cr(III) in complex to under 1.5 mg L −1 (MCL), which is an ideal method for tanning wastewater. As described in previous literature [6], it is a challenge to decrease the concentration of trace Cr(III) in complex form to below 1.5 mg L −1 , which is important for real-world, environmental watertreatment applications, especially in the leather factory [47]. To investigate the ability of PAN-TA-3 NFs to remove trace Cr(III) in complex form, the effects of adsorbent dosage of PAN-TA-3 NFs and initial concentration of Cr(III) on the residual Cr(III) concentration in solution were analyzed.…”

Section: Trace Cr(iii) In Complex Removalmentioning

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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Section: Trace Cr(iii) In Complex Removalmentioning

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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“…There appears to be an increase in the regeneration and production of iron ions (Fe 2+ ) when iron electrodes are used. To arrive at a desired condition, the iron ions generated were calculated as 217 mg for tannery wastewater [42]. The additional generation of iron ions curtails the external requirements of Fe 2+ .…”

Section: Effect Of Interfering Ionsmentioning

confidence: 99%

“…The energy consumption in kWh/L during Cr(III) removal in t time was calculated using the equation [Eq. (16)] [42,45].…”

Section: Economic Analysis and Electrical Energy Consumption (Eec)mentioning

confidence: 99%

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Selvabharathi¹,

Adishkumar²,

Banu³

2019

DWT

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Chromium(III) used in tanning process is not consumed fully and around 30-40% of Chromium(III) is washed away to the environment causing severe environmental problem especially to the aquatic system. To remove Chromium(III) from wastewater, many different treatment techniques have been developed. This study deals with the ability of electrochemical peroxidation process for the removal of Chromium(III) from tannery wastewater in a batch stirred tank bench scale reactor with hopper bottom of 5 L working volume equipped with two iron electrodes which were investigated. The removal percentage of chromium was determined by varying operating parameters such as pH = 2-8, Fe 2+ = 2-5 mg/L, H 2 O 2 = 5-20 mg/L and current density = 10-40 mA/cm 2 were studied. The results showed that the Chromium(III) removal efficiency of 87% was achieved under optimum condition such as pH = 2, Fe 2+ = 2 mg/L H 2 O 2 = 15 mg/L, current density = 30 mA/cm 2 and contact time was 120 min with an electrical energy consumption of 0.073 kWh/L. The operating costs for the removal of Chromium(III) was found to be 0.4 $/m 3 for treated tannery wastewater. The electrochemical peroxidation process proved to be an efficient and appropriate technique for the removal of Chromium(III) from tannery wastewater.

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“…Decontamination of wastewater has been carried out by different treatment systems and conventional methods like filtration, evaporation, coagulation, flocculation, ion exchange, electro‐precipitation, reverse osmosis, ultra‐filtration, biological treatment, wet oxidation, adsorption, chemical and electrochemical techniques . Most of these methods carry out incomplete removal of dyes.…”

Section: Introductionmentioning

confidence: 99%

Selenide‐chitosan as High‐performance Nanophotocatalyst for Accelerated Degradation of Pollutants

Ali

Ahmad

Khan

et al. 2020

Chemistry An Asian Journal

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Water pollution is one of the major global challenges today. Water bodies are contaminated by the heavy release of waste effluents of textile industries, which includes intensively colored dye pollutants. Herein, a ternary nanocomposite of bismuth copper selenide with small particle size and ternary metal selenide (TMS)‐chitosan microspheres (TMS‐CM) of the spherical porous surface were successfully synthesized. SEM, XRD, EDX, FTIR, and UV/Vis spectrophotometry analysis revealed the structural and morphological characteristics of the newly synthesized nanocomposites. SEM imaging showed the average diameter of TMS nanoparticle to be 33 nm. The crystal size was calculated as 6.33 nm and crystalline structure as orthorhombic using XRD findings. EDX confirmed the presence of Bi, Cu, and Se in the ternary nanocomposite. The bandgap of 1.8 eV was calculated from Tauc's plot for the TMS nanocomposite. SEM confirmed the successful synthesis of spherical TMS‐CM microspheres of porous surface morphology with an average size of 885.6 μm. The presence of chitosan microspheres in the synthesis of TMS nanocomposite was identified by FTIR spectral analysis. Furthermore, highly efficient photocatalytic degradation (up to 95.4%) of ARS was achieved within 180 min at pH 4.0 using 0.5 g of TMS‐CM in sunlight. The first‐order kinetic model fitted well to the photocatalytic decontamination of ARS using TMS‐CM with a rate constant of 6.1x10−2 min−1. The TMS‐CM gave attractive results and high efficiency in photocatalytic degradation of ARS dye after reusing and regeneration of up to seven successive cycles. The newly synthesized nanophotocatalyst could be efficiently used for the decontamination of dye polluted water from textile industries.

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Cr(III) removal from synthetic and real tanning effluents using an electro-precipitation method

Cited by 31 publications

References 25 publications

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

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

Removal of chromium (III) from tannery wastewater by electrochemical peroxidation process in a bench scale reactor

Selenide‐chitosan as High‐performance Nanophotocatalyst for Accelerated Degradation of Pollutants

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