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RISS 인기검색어
- 검색키워드
- 저자 : Meysam Naghizadeh (검색결과 2 건)
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Ali Naghizadeh,Seyyed Jalal Mousavi,Elham Derakhshani,Mohammad Kamranifar,Seyyed Meysam Sharifi 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.3
The large volumes of water used in wood and paper industries produce substantial amounts of wastewater. These industries are among the most polluting ones in the world; there are large quantities of heavy metals (copper, iron, zinc, etc.) and dyes in the wastewater of these industries, and this wastewater has high levels of COD and BOD. We studied copper removal from the effluents of a wood and paper factory by using a polypyrrole composite consisting of natural Zeolite coated on Perlite (PPy/Perlite). The experiments were performed in a batch system in which effects of various parameters including pH, contact time, adsorbent dosage, and temperature on adsorption were studied. Moreover, SEM and FTIR were employed to identify the structure of the synthesized adsorbent. Results indicated that the maximum copper removal (95%) happened at pH=6, contact time of 12 minutes, and adsorbent dose of 0.4 g/ 100 mL of the wastewater. Furthermore, copper adsorption capacity of the PPy/Perlite adsorbent improved with increases in temperature and reached its peak at 40 oC. Values of the thermodynamic variables (ΔS, ΔH, ΔG) indicated that copper adsorption could occur in the temperature range of 293-323 Kelvin, and was spontaneous and endothermic. Equilibrium information in the studied range of the initial concentrations of copper and in the temperature range suitably matched the Freundlich isotherm. Evaluation of experimental information for studying the kinetics of copper adsorption by PPy/Perlite revealed that copper adsorption followed the pseudo-second-order kinetic model.
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Thermal Mechanisms of Grain Refinement in Steels: A Review
Zahra Nasiri,Sajad Ghaemifar,Meysam Naghizadeh,Hamed Mirzadeh 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Thermal mechanisms of microstructural refnement in steels were reviewed. These include thermal cycling, martensiteprocess, and static recrystallization (SRX), in which the dominant stage of microstructural refnement is governed by anannealing treatment of a deformed or an undeformed material. Recent progress in grain refnement by thermal cycling forthe body-centered cubic, face-centered cubic, and dual phase (DP) steels was introduced. The application of the cold rollingand subsequent annealing of a martensite starting structure (martensite process) for grain refnement of low-carbon and DPsteels was reviewed. The formation and reversion of strain-induced martensite in metastable austenitic stainless steels andtheir efects on the microstructural evolutions were critically discussed. Moreover, the repetition of the martensite processand its limitations were explained. Important fndings on the SRX of ferrite and austenite for grain refnement as well as therecrystallization kinetics were presented. Finally, the concepts of controlled rolling for grain refnement and the interaction ofaustenite recrystallization and strain-induced precipitation in microalloyed steels during thermomechanical processing werealso reviewed. This short overview presents the opportunities that the conventional and innovative processing routes canofer for grain refnement of steels.
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