Previous Issue - Journal of Environment and Biotechnology Research

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Zero-valent iron nanostructures: synthesis, characterization and application

Journal of Environment & Biotechnology Research, Vol. 7, No. 1, Pages 1-10, Jan 2018

Maha M. El-Shafei, Ahmed Hamdy, M. M. Hefny

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ABSTRACT

In this study, nano-scale zero valent iron (nZVI) was synthesized in the ethanol medium by reduction of ferric iron using sodium borohydride as a reducing agent under atmospheric conditions. The synthesized iron nanoparticles are mainly in zero valent oxidation state and remain without significant oxidation for weeks. A methodical characterization of nZVI was carried out using XRD, SEM, TEM, UV and FTIR studies. The acquired iron nanoparticles consist of a zero valent core embracing a rest oxide shell. The iron nanoparticles diameter was predominantly in the range of 10-100 nm. The laboratory synthesized nZVI particles was examined for methylene blue (MB) removal efficiency from aqueous solution in relation to the contact time, dye concentration and temperature. The increase in the contact time and temperature enhanced the dye decolorization. The degradation decreased from 91.7 to 72.0% on increasing the concentration of dye from 10 to 70 mg/L. These findings elucidated the rapid removal of MB by nZVI and the feature of the synthesized nZVI particles to treat MB contaminated wastewater.
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A review on biochar feedstocks, production, characterization, modification and potential applications

Journal of Environment & Biotechnology Research, Vol. 7, No. 1, Page 11, Jan 2018

K. Vijayaraghavan

VIDEO CONTENT

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ABSTRACT

Biochar is a stable carbon-rich by-product prepared from biomaterials through various heating methods. This video discusses different methods of biochar production, factors influencing biochar production and properties, mechanism of biochar production, methods to examine the structure and composition of biochar, techniques to modify the biochar for various applications. Biochar is usually produced through various techniques such as pyrolysis, torrefaction, gasification, flash carbonization and hydrothermal carbonization. The property of synthesized biochar depends on several factors, including feedstock composition and type, pyrolysis conditions such as temperature and time. The physical and chemical properties of biochar play a major role in several applications such as agriculture, environmental remediation, catalyst/support, fuel cells and supercapacitors. Recent research indicated that it is possible to alter the properties of biochar to suit the applications with the aid of various physical and chemical agents. Thus, this video review summarizes the advancements made in the field of biochar with special emphasis on agricultural applications and contaminant remediation.
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Journal of Environment and Biotechnology Research