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      • KCI등재후보

        SELECTION OF A SUITABLE METHOD FOR THE SYNTHESIS OF COPPER NANOPARTICLES

        ASIM UMER,SHAHID NAVEED,NAVEED RAMZAN,MUHAMMAD SHAHID RAFIQUE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5

        Various methods for the synthesis of copper nanoparticles employing chemical, physical and biological techniques considering bottom-up and top-down methods synthesis have been studied. The properties of copper nanoparticles depend largely on their synthesis procedures. The results from various investigations performed by di®erent scientists using these methods have been summarized. The applications, characterization techniques, advantages and disadvantages of each synthesis method are also the point of discussion. A detailed study of the results reveals that chemical reduction methods are most suitable for the synthesis of copper nanoparticles. Chemical reduction of copper salts using ascorbic acid (Vitamin C) is a new and green approach in which ascorbic acid is used both as the reduction and capping agent. This approach is the most e®ective and is also economical. Wide applications have been reported in various ¯elds, including heat transfer, catalyst production, electronics and medicine at a commercial scale. This process is nontoxic, environment-friendly and economical. The applications, characterization techniques, advantages and disadvantages of each synthesis method have been presented.

      • KCI등재

        Dead immobilized Rhizopus Arrhizus as a potential biosorbent for copper removal

        Mohsin Kazmi,Nadeem Feroze,Naveed Ramzan 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1

        The contemporary study reveals the potential of dead immobilized Rhizopus Arrhizus (DIRA) by studying the effects of initial pH of solution, contact time, initial Cu(II) concentration, co-ion, desorption and biosorbent reuse on the uptake of Cu(II) from synthetic solution. Optimum pH for Cu(II) biosorption on DIRA was 6.5. Pseudo secondorder kinetic most suitably elucidated the kinetic trend. Removal of Cu(II) by DIRA followed the Freundlich adsorption isotherm. Experiments on effect of temperature revealed endothermic nature of Cu(II) biosorption upon DIRA. Na+and Ca++ showed synergetic effect, while Mg++ and Zn++ revealed antagonistic effect on the biosorption of Cu(II). It was shown that reuse of DIRA was possible by means of 0.1 M HCl as an eluent.

      • KCI등재

        Exergoeconomic analysis of an LNG integrated - air separation process

        Hamayun Muhammad Haris,Ramzan Naveed,Faheem Muhammad 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12

        An integrated LNG regasification - air separation process is investigated using exergy and exergoeconomic analyses. The objective of developing this integrated process is to lower the calorific value of LNG by mixing regasified LNG with high purity nitrogen, while simultaneously recovering and utilizing valuable cryogenic energy from the LNG during its regasification to minimize the power consumption of the air separation unit (ASU) for nitrogen production. The overall exergy efficiency and exergy destruction of the integrated process are 76.47% and 28.52MW, respectively, with the compression section causing the most exergy destruction. Further exergoeconomic analysis of the proposed process reveals that the air compressors have the highest capital investment (CI) and operating and maintenance (O&M) cost rates, the pumps for cooling water and LNG have the highest exergoeconomic factors, and the low-pressure column and a multistream heat exchanger have the highest exergy destruction cost rates. A parametric study is also conducted to examine the impact of economic variables including interest rate, plant life, and compressor performance on exergy destruction, CI and O&M cost rates, and exergoeconomic factor. The findings of this study offer valuable insight into the design and optimization of similar integrated processes, with potential benefits for the energy industry.

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