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RISS 인기검색어
- 검색키워드
- 저자 : Ajit K. Sarmah (검색결과 3 건)
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O'Connor, David,Hou, Deyi,Ok, Yong Sik,Song, Yinan,Sarmah, Ajit K.,Li, Xuanru,Tack, Filip M.G. Elsevier 2018 Journal of controlled release Vol.283 No.-
<P><B>Abstract</B></P> <P>The removal of recalcitrant organic pollutants in groundwater is a challenge being faced around the world. Achieving effective long-term remediation of contaminated aquifers faces a variety of significant issues such as back diffusion, tailing, and rebound. In recent years, some researchers have proposed the use of controlled release materials (CRMs) as a new approach to counteracting such issues. The novelty of CRMs lies in that they release their active products slowly, over prolonged periods of time, in order to sustain in situ treatments and long-term effectiveness. Here we review the main constituents of CRMs, analyze their production, characterization, and applications, with a focus on reaction mechanisms, effectiveness, and secondary effects. This review shows that the reactive components of CRMs most commonly involve either: (i) chemical oxidants to treat contaminants such as TCE, PCE, BTEX, and 1,4-Dioxane; (ii) sources of dissolved oxygen to stimulate aerobic biodegradation of contaminants such as BTEX and 1,4-Dioxane; or, (iii) substrates that stimulate reductive dechlorination of contaminants such as TCE and 1,2-DCA. It was found that in some studies, CRMs provided sustained delivery of CRM treatment reagents over several years, and achieved complete contaminant removal. However, lower removal rates were apparent in other cases, which may be ascribed to insufficient dispersion in the subsurface. There are a relatively limited number of field-scale applications of CRMs in contaminated land remediation. Those conducted to date suggest that CRMs could prove to be an effective future remediation strategy. Lessons learned from field applications, suggestions for future research directions, and conclusions are put forward in this review.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Long-term remediation of groundwater remains very challenging. </LI> <LI> Researchers have proposed the use of a variety of controlled release materials. </LI> <LI> They can release chemical oxidants, sources of dissolved oxygen, or substrates. </LI> <LI> Some controlled release materials can sustain reagent release for several years. </LI> <LI> Future research needs are put forward to help further develop these materials. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Poulose, Anesh Manjaly,Elnour, Ahmed Yagoub,Anis, Arfat,Shaikh, Hamid,Al-Zahrani, S.M.,George, Justin,Al-Wabel, Mohammad I.,Usman, Adel R.,Ok, Yong Sik,Tsang, Daniel C.W.,Sarmah, Ajit K. Elsevier 2018 The Science of the total environment Vol.619 No.-
<P><B>Abstract</B></P> <P>The application of biochar (BC) as a filler in polymers can be viewed as a sustainable approach that incorporates pyrolysed waste based value-added material and simultaneously mitigate bio-waste in a smart way. The overarching aim of this work was to investigate the electrical, mechanical, thermal and rheological properties of biocomposite developed by utilizing date palm waste-derived BC for the reinforcing of polypropylene (PP) matrix. Date palm waste derived BC prepared at (700 and 900°C) were blended at different proportions with polypropylene and the resultant composites (BC/PP) were characterized using an array of techniques (scanning electron microscope, energy-dispersive X-ray spectroscopy and Fourier transform infra-red spectroscopy). Additionally the thermal, mechanical, electrical and rheological properties of the BC/PP composites were evaluated at different loading of BC content (from 0 to15% w/w). The mechanical properties of BC/PP composites showed an improvement in the tensile modulus while that of electrical characterization revealed an enhanced electrical conductivity with increased BC loading. Although the BC incorporation into the PP matrix has significantly reduced the total crystallinity of the resulted composites, however; a positive effect on the crystallization temperature (T<SUB>c</SUB>) was observed. The rheological characterization of BC/PP composites revealed that the addition of BC had minimal effect on the storage modulus (G′) compared to the neat (PP).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Date palm waste derived biochar was used as filler for polymer composites' applications. </LI> <LI> Biochar/polypropylene (BC/PP) composites' properties such as electrical, mechanical, thermal and rheological were investigated. </LI> <LI> The BC/PP composites' surface resistivity was decreased by four orders of magnitude. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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