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      Valorization of coal fired-fly ash for potential heavy metal removal from the single and multi-contaminated system

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          Abstract

          In this study, adsorption of three different heavy metals i.e. cadmium (Cd (II)), copper (Cu (II)) and nickel (Ni (II)) was carried out in single and multi-contaminated system using coal-fired fly ash (CFFA). Initially, for the single contaminated system, various physical process parameters were selected for optimization by deploying Box–Behnken design of experiments. Further, the evaluation of CFFA for removal of heavy metals in a multi-component system from aqueous solution was performed by employing Plackett-Burman design of experiments with all the three heavy metals at two different levels by varying their initial concentration (10–50 mg L −1). In both the aforementioned cases, CFFA showed its great potential for heavy metal removal, i.e. single and multi-component system and followed the order: Cu (II) > Ni (II) > Cd (II). Further, FTIR study confirmed the involvement of amide, aldehyde, alkoxy, alkanes, and alkene groups for heavy metal adsorption by CFFA.

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          A critical review on speciation, mobilization and toxicity of lead in soil-microbe-plant system and bioremediation strategies

          Lead accumulation in soils is of serious concern in agricultural production due to the harmful effects on soil microflora, crop growth and food safety. In soil, speciation of lead greatly affects its bioavailability and thus its toxicity on plants and microbes. Many plants and bacteria have evolved to develop detoxification mechanisms to counter the toxic effect of lead. Factors influencing the lead speciation include soil pH, organic matter, presence of various amendments, clay minerals and presence of organic colloids and iron oxides. Unlike, other metals little is known about the speciation and mobility of lead in soil. This review focuses on the speciation of lead in soil, its mobility, toxicity, uptake and detoxification mechanisms in plants and bacteria and bioremediation strategies for remediation of lead contaminated repositories.
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            Magnetic Fe(2)MO(4) (M:Fe, Mn) activated carbons: fabrication, characterization and heterogeneous Fenton oxidation of methyl orange.

            We present a simple and efficient method for the fabrication of magnetic Fe(2)MO(4) (M:Fe and Mn) activated carbons (Fe(2)MO(4)/AC-H, M:Fe and Mn) by impregnating the activated carbon with simultaneous magnetic precursor and carbon modifying agent followed by calcination. The obtained samples were characterized by nitrogen adsorption isotherms, X-ray diffraction (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM), and the catalytic activity in heterogeneous Fenton oxidation of methyl orange (MO) was evaluated. The resulting Fe(2)MnO(4)/AC-H showed higher catalytic activity in the methyl orange oxidation than Fe(3)O(4)/AC-H. The effect of operational parameters (pH, catalyst loading H(2)O(2) dosage and initial MO concentration) on degradation performance of the oxidation process was investigated. Stability and reusability of selected catalyst were also tested.
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              Synthesis and characterization of new zeolite materials obtained from fly ash for heavy metals removal in advanced wastewater treatment

              Maria Visa (2016)
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                Author and article information

                Contributors
                Journal
                Heliyon
                Heliyon
                Heliyon
                Elsevier
                2405-8440
                14 October 2019
                October 2019
                14 October 2019
                : 5
                : 10
                : e02562
                Affiliations
                [a ]Uttar Pradesh Pollution Control Board, Sadbhawna Nagar, Kanpur, Uttar Pradesh, 208001, India
                [b ]Department of Biochemical Engineering, Harcourt Butler Technical University, Nawabganj, Kanpur, Uttar Pradesh, 208002, India
                [c ]Center for the Environment, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
                [d ]Department of Food Technology, Harcourt Butler Technical University, Nawabganj, Kanpur, Uttar Pradesh, 208002, India
                Author notes
                []Corresponding author. mahendra.bbt@ 123456gmail.com
                Article
                S2405-8440(19)36222-X e02562
                10.1016/j.heliyon.2019.e02562
                6812189
                f6d29bb7-bba8-47e3-8033-f2bd727fa948
                © 2019 The Authors

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 25 January 2019
                : 1 June 2019
                : 30 September 2019
                Categories
                Article

                energy,environment,chemical engineering,coal-fired fly ash,response surface methodology,mixture component study,heavy metals,contour plots

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