Nano-remediation of toxic heavy metal contamination: Hexavalent chromium [Cr(VI)]

Nazeer, Abdul Azeez; Dash, Swati Sucharita; Gummadi, Sathyanarayana N.; Deepa, Vijaykumar Sudarshana

doi:10.1016/j.chemosphere.2020.129204

Cited by 138 publications

(37 citation statements)

References 103 publications

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“…As seen from Fig 3(B) , when the dosage of Citrobacter was 0%, the removal rate of Cr(VI) was more than 86%, and thus, it can be judged that the hybrid material can remove Cr(VI). Azeez et al also found that nano-ZrO 2 has a repairing effect on Cr(VI) [ 37 ]. At the beginning of the reaction, the amount of Cr(VI) reduced by Citrobacter was low, but when the dosage of Citrobacter was more than 35%, the final removal rate of Cr(VI) reached more than 100%.…”

Section: Resultsmentioning

confidence: 99%

Remediation of chromium- and fluoride-contaminated groundwater by immobilized Citrobacter sp. on a nano-ZrO2 hybrid material

Fan

Zhang

et al. 2021

PLoS ONE

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To effectively address excessive SO42-, Cr(VI), total chromium and F- in the groundwater of acidic mining areas, a facultative anaerobic bacterium, Citrobacter, with sulfate-reducing properties, tolerance to hexavalent chromium and the ability to reduce Cr(VI) to Cr(III) was isolated and domesticated. Based on microbial immobilization technology, a nano-ZrO2 polyacrylamide hybrid material was prepared as an embedding agent to form nano-ZrO2 polyacrylamide Citrobacter (ZPC) particles. ZPC was microscopically characterized, and the removal performance and mechanism of ZPC for SO42-, Cr(VI), total chromium and F- in groundwater were analyzed. The results of single-factor tests showed that the optimal reaction conditions included a reaction temperature of 35°C, Citrobacter dosage of 35% (volume ratio) in the particles and hybrid material dosage of 300 mL; under these conditions, the removal rates of SO42-, Cr(VI), total chromium and F- were 70.5%, 100%, 100% and 93.3%, respectively, and the pH value increased from 4.6 to 8.07. On this basis, the effects of the reaction layer type, influent hydraulic load and influent concentration on the removal efficiency of polluted groundwater were studied through dynamic experiments. The experimental results showed that ZPC particles were better than Citrobacter as a reaction layer; the optimal influent hydraulic load was 3.0 m3/(m2·d); the selectivity of ZPC particles to anions and anionic groups was different; and the order of adsorption selectivity was F- > Cr(VI) > SO42-.

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Section: Resultsmentioning

confidence: 99%

Remediation of chromium- and fluoride-contaminated groundwater by immobilized Citrobacter sp. on a nano-ZrO2 hybrid material

Fan

Zhang

et al. 2021

PLoS ONE

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“…Due to its high solubility, chromium (VI) can easily contaminate water supplies and the air, making it highly pollutant [ 38 ]. Chromium (VI) is usually found in the form of chromate oxyanion: [CrO 4 ] 2− .…”

Section: Chromium: Biochemistry and Derivatesmentioning

confidence: 99%

“…Chromium (VI) is popularly used in the metal and paint industries for its anticorrosion properties. This oxidation state is known to be mutagenic and carcinogenic and is often found in industrialized areas [ 38 ]. However, chromium (III) is considered an essential element and is often found in dietary supplements especially recommended for diabetic individuals [ 39 ].…”

Section: Introduction: Male Reproductive Health and Oxidative Stress At Briefmentioning

confidence: 99%

Impact of Environmental and Lifestyle Use of Chromium on Male Fertility: Focus on Antioxidant Activity and Oxidative Stress

Pereira

Oliveira

et al. 2021

Antioxidants

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Male reproductive tissues are strongly susceptible to several environmental and lifestyle stressors. In general, male reproductive health is highly sensitive to oxidative stress, which results in reversible and/or irreversible changes in testosterone-producing cells, spermatogenesis, and sperm quality. Chromium compounds are widely used in the +3 and +6 valence states, as food supplements, and in the industrial field, respectively. Chromium (III) compounds, i.e., Cr(III)-tris-picolinate, [Cr(pic)3], known as chromium picolinate, are used as nutritional supplements for the control of diabetes, body weight, and muscular growth. However, previous studies showed that animal models exposed to chromium picolinate experienced degenerative changes in spermatogenesis. Contradictory results are documented in the literature and deserve discussion. Furthermore, the long-term effects of chromium picolinate on the antioxidant system of treated subjects have not been properly studied. Comprehensive studies on the role of this compound will help to establish the safe and useful use of chromium supplementation. On the other hand, chromium (VI) compounds are widely used in several industries, despite being well-known environmental pollutants (i.e., welding fumes). Chromium (VI) is known for its deleterious effects on male reproductive health as toxic, carcinogenic, and mutagenic. Previous studies have demonstrated severe lesions to mouse spermatogenesis after exposure to chromium (VI). However, workers worldwide are still exposed to hexavalent chromium, particularly in electronics and military industries. Data from the literature pinpoints mechanisms of oxidative stress induced by chromium compounds in somatic and germ cells that lead to apoptosis, thus underlining the impairment of fertility potential. In this review, we analyze the benefits and risks of chromium compounds on male fertility, as well as the mechanisms underlying (in)fertility outcomes. Although supplements with antioxidant properties may maximize male fertility, adverse effects need to be investigated and discussed.

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“…This means NPs is double-edged sword ( Srivastav et al, 2018 , Zhang et al, 2019 , Romeh and Saber, 2020 , Gong et al, 2021 , Ganie et al, 2021 ). Common case studies are published about removing many heavy metals using NPs from contaminated media (i.e., water, soil and sediments) such as arsenic ( Alka et al, 2021 , Maity et al, 2021 ), cadmium ( Gong et al, 2021 ), chromium ( Azeez et al, 2021 ), copper ( Yin et al, 2020 ), lead ( Lian et al, 2021 ), mercury ( Kumari et al, 2020 ), and zinc ( Fajardo et al, 2020 ).…”

Section: Nutrients Based Nanoparticles In Edible Plants For Human Healthmentioning

confidence: 99%

Nano-biofortification of different crops to immune against COVID-19: A review

El-Ramady

Abdalla

Elbasiouny

et al. 2021

Ecotoxicology and Environmental Safety

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Human health and its improvement are the main target of several studies related to medical, agricultural and industrial sciences. The human health is the primary conclusion of many studies. The improving of human health may include supplying the people with enough and safe nutrients against malnutrition to fight against multiple diseases like COVID-19. Biofortification is a process by which the edible plants can be enriched with essential nutrients for human health against malnutrition. After the great success of biofortification approach in the human struggle against malnutrition, a new biotechnological tool in enriching the crops with essential nutrients in the form of nanoparticles to supplement human diet with balanced diet is called nano-biofortification. Nano biofortification can be achieved by applying the nano particles of essential nutrients (e.g., Cu, Fe, Se and Zn) foliar or their nano-fertilizers in soils or waters. Not all essential nutrients for human nutrition can be biofortified in the nano-form using all edible plants but there are several obstacles prevent this approach. These stumbling blocks are increased due to COVID-19 and its problems including the global trade, global breakdown between countries, and global crisis of food production. The main target of this review was to evaluate the nano-biofortification process and its using against malnutrition as a new approach in the era of COVID-19. This review also opens many questions, which are needed to be answered like is nano-biofortification a promising solution against malnutrition? Is COVID-19 will increase the global crisis of malnutrition? What is the best method of applied nano-nutrients to achieve nano-biofortification? What are the challenges of nano-biofortification during and post of the COVID-19?

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Nano-remediation of toxic heavy metal contamination: Hexavalent chromium [Cr(VI)]

Cited by 138 publications

References 103 publications

Remediation of chromium- and fluoride-contaminated groundwater by immobilized Citrobacter sp. on a nano-ZrO2 hybrid material

Remediation of chromium- and fluoride-contaminated groundwater by immobilized Citrobacter sp. on a nano-ZrO2 hybrid material

Impact of Environmental and Lifestyle Use of Chromium on Male Fertility: Focus on Antioxidant Activity and Oxidative Stress

Nano-biofortification of different crops to immune against COVID-19: A review

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