Iron(II) modified natural zeolites for hexavalent chromium removal from contaminated water

Lofù, Antonio; Mastrorilli, Piero; Dell’Anna, Maria Michela; Mali, Matilda; Sisto, R.; Vignola, Rodolfo

doi:10.1515/aep-2016-0004

Cited by 20 publications

(4 citation statements)

References 46 publications

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“…Cr(VI) contamination in groundwater systems is conventionally treated using the pump-and-treat methods which involve the extraction of contaminated water from the aquifer, treatment above ground, and injection of the treated water back into the aquifer [64,65]. Even though a number of successful reports are available on the success of using the pumpand-treat technique to remediate Cr-contaminated groundwater, the issue in removing residual Cr persists until the present day [66].…”

Section: Operational Challenges For Bacterial Cr(vi) Reductionmentioning

confidence: 99%

“…Therefore, the chemical processes are viewed as costly and environmentally intrusive. Alternative biological treatment methods using aquatic biomass and/or Cr(VI)-reducing bacteria have long been investigated and proposed by a number of researchers [64,68]. These methods may be applied ex situ [70] or in situ in biological barriers [71].…”

Section: Operational Challenges For Bacterial Cr(vi) Reductionmentioning

confidence: 99%

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Bacterial Reduction of Cr(VI): Operational Challenges and Feasibility

et al. 2021

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Purpose of Review Hexavalent chromium, Cr(VI), and trivalent chromium, Cr(III), are two chromium compounds with practical importance due to their high occurrence and solubility in the environment. Current Cr(VI) treatment techniques involve chemical reduction of Cr(VI) to Cr(III), which posed serious threat to workers and environment notably from long exposure and toxic fumes.Recent Findings Numerous reports have demonstrated the feasibility of using biological processes for the treatment of Cr(VI) industrial effluents by either pure culture or a consortium of Cr(VI)-reducing bacteria, with various degrees of success. Among issues to be considered include high cost of nutrient for the bacteria, low Cr resistant-reducing ability of environmental isolates, difficulty in scaling up finding in the laboratory to pilot scale and on-site application as well as the understanding on the dynamic underlying mechanisms for bacterial Cr(VI) reduction. Summary This review highlights cytotoxicity and genotoxicity properties of Cr(VI), which form the biggest motivation for continuous development in the field of Cr(VI) treatment technologies, latest finding in aerobic and anaerobic bacterial reduction of Cr(VI), operational challenges for bacterial Cr(VI) reduction, and some examples for laboratory-scale and pilot-scale evaluation of free and immobilized (biofilm) cells of Cr(VI) resistant-reducing bacteria.

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Section: Operational Challenges For Bacterial Cr(vi) Reductionmentioning

confidence: 99%

Section: Operational Challenges For Bacterial Cr(vi) Reductionmentioning

confidence: 99%

Bacterial Reduction of Cr(VI): Operational Challenges and Feasibility

et al. 2021

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“…Attachment of reductants, such as Fe(II), to natural zeolites allows for adsorption and subsequent reduction of Cr(VI). Such a system showed a Cr(VI) removal rate of 90 mg per kg of zeolite, but suffered from extensive leaching of iron [89]. Natural zeolite can also be coated with biofilms for Cr(VI) removal [90].…”

Section: Conventional Processes For Chromium Remediationmentioning

confidence: 99%

Removal of chromium from industrial effluents using nanotechnology: a review

Mitra

Sarkar

Sen

2017

Nanotechnol. Environ. Eng.

138

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The presence of chromium in industrial effluents has become a huge problem worldwide as hexavalent chromium is highly toxic to animals due to its ability to generate reactive oxygen species in cells. The trivalent state of chromium, on the other hand, is significantly less toxic and also serves as an essential element in trace amounts. When industries such as electroplating, tannery, dyeing and others release their effluents into water bodies, hexavalent chromium enters the food chain and, consequently, reaches humans in a biomagnified form. Many remediation processes for removal of hexavalent chromium have been researched and reviewed extensively. These include chemical reduction to trivalent chromium, solvent extraction, chelation and adsorption, among others. It has been generally concluded that adsorption (and/or subsequent reduction) of hexavalent chromium is the best method. However, relatively little is known about the potential of using nanoparticles as adsorbents for the removal of hexavalent chromium from industrial effluents. This method of nanoremediation is more effective than conventional remediation methods and is cost-effective for the industry in the long run. This article reviews the various remediation methods of hexavalent chromium, with emphasis on the field of nanoremediation.

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“…Many of these industries release significant amounts of Cr(VI) into surface water bodies, which leads to critical Cr(VI) levels around these manufacturing sites [3,10]. Some of the most common methods to control Cr(VI) levels in water are ion exchange, precipitation, flocculation, reverse osmosis, electrocoagulation, electrodialysis, membrane filtration, solvent extraction, and adsorption [3,5,10,14,15]. Each of these methods has advantages and drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon from Sugarcane Bagasse: A Low-Cost Approach towards Cr(VI) Removal from Wastewater

et al. 2023

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The potential of pretreated sugarcane bagasse (SCB) as a low-cost and renewable source to yield activated carbon (AC) for chromate CrO42− removal from an aqueous solution has been investigated. Raw sugarcane bagasse was pretreated with H2SO4, H3PO4, HCl, HNO3, KOH, NaOH, or ZnCl2 before carbonization at 700 °C. Only pretreatments with H2SO4 and KOH yield clean AC powders, while the other powders still contain non-carbonaceous components. The point of zero charge for ACs obtained from SCB pretreated with H2SO4 and KOH is 7.71 and 2.62, respectively. Batch equilibrium studies show that the most effective conditions for chromate removal are a low pH (i.e., below 3) where >96% of the chromate is removed from the aqueous solution.

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Iron(II) modified natural zeolites for hexavalent chromium removal from contaminated water

Cited by 20 publications

References 46 publications

Bacterial Reduction of Cr(VI): Operational Challenges and Feasibility

Bacterial Reduction of Cr(VI): Operational Challenges and Feasibility

Removal of chromium from industrial effluents using nanotechnology: a review

Activated Carbon from Sugarcane Bagasse: A Low-Cost Approach towards Cr(VI) Removal from Wastewater

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