Browsing by Author "Mirzaee, Seyyed Abbas"
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- Adsorption of diclofenac on mesoporous activated carbons: physical and chemical activation, modeling with genetic programming and molecular dynamic simulationPublication . Mirzaee, Seyyed Abbas; Bayati, Behruz; Valizadeh, Mohammad Reza; Gomes, Helder; Noorimotlagh, ZahraThis work aims at the preparation of AC from chemical activation (H3PO4, KOH, and HCl)and physical activation (thermal treatment under N2atmosphere at 500 and 700◦C) of Astra-galus Mongholicus (AM) (a low-cost bio-adsorbent and agro-industrial waste), used as carbonprecursor. The obtained materials were further applied in the adsorption of diclofenac(DCF) from water/wastewater. The physicochemical properties of the as-prepared ACs andcommercial activated carbons (CAC) were evaluated by SEM, XRD, FT-IR, and BET analyses,revealing the high surface area and mesoporous proportion of AC when compared to CAC. Adsorption results showed that the efficiency of AC-700◦C (774 m2g−1) for DCF removal(92.29%) was greater than that of AC-500◦C (648 m2g−1, 83.5%), AC-H3PO4(596 m2g−1, 80.8%),AC-KOH (450 m2g−1, 59.3%), AC-HCl (156 m2g−1, 29.8%) and CAC (455 m2g−1, 67.8%). The opti-mization of effective parameters in adsorption was examined at a laboratory-scale using theselected AC-700◦C. The Langmuir isotherm and the pseudo-second-order model fitted wellthe experimental data. The regeneration efficiency was maintained at 96% (DI-water) and97% (heating) after three cycles. Besides, genetic programming (GP) and molecular dynam-ics (MD) simulations were applied to predict the adsorption behavior of DCF from aqueousphase as well as in the ACs structure. It was found that the adsorption mechanisms involvedwere electrostatic interaction, cation–pi interaction, and pi–pi electron interaction.
- Enhanced degradation of Bisphenol A from high saline polycarbonate plant wastewater using wet air oxidationPublication . Mirzaee, Seyyed Abbas; Jaafarzadeh, Neamat; Jorfi, Sahand; Gomes, Helder; Ahmadi, MehdiIn the present study, wet air oxidation(WAO) was investigated for the decomposition of bisphenol A (BPA) in high saline polycarbonate plant wastewater(PCW). The main operating conditions of the WAO process that affects the degradation efficiency, including temperature, total air pressure and reaction time were studied. The results indicate that complete BPA degradation is achieved in pH 8.5, temperature = 150◦C, total air pressure of 3 MPa and 120 min.In addition, by prolonging the reaction time to 24h, removals of 62% and 37%, were obtained regarding chemical oxygen demand (COD) and total oxygen carbon (TOC), respectively. The intermediates of BPA degradation generated in aqueous solution by the WAO process were identified and the proposed plausible mechanism was reported. Under optimum experimental conditions, the biodegradability of treated PCW after WAO process was shown to significantly improve, by analysis of biodegradability index, including BOD5/COD ratio, values of average oxidation state (AOS) and carbon oxidation state (COS). The WAO process was found to be an effective method to degrade highly toxic organic matter in high saline industrial wastewater such as PCW. The results indicate that WAO, as a pretreatment technology, is an economic and eco-friendly method for the treatment of PCW.
- Magnetic titanium/carbon nanotube nanocomposite catalyst for oxidative degradation of Bisphenol A from high saline polycarbonate plant effluent using catalytic wet peroxide oxidationPublication . Mirzaee, Seyyed Abbas; Jaafarzadeh, Neamat; Gomes, Helder; Jorfi, Sahand; Ahmadi, MehdiIn this study, a magnetic titanium nanotube/carbon nanotube nanocomposite (magnetite TNT@CNT nanocomposite) was developed and its efficiency was evaluated towards oxidative degradation of Bisphenol A (BPA) from high saline polycarbonate plant wastewater (PCW) using catalytic wet peroxide oxidation (CWPO). The characterization of the nanocomposite was performed using XRD, SEM, BET surface area, FT-IR, and VSM analysis. The effects of operating conditions, including solution pH, H2O2 dosage, reaction temperature and catalyst loading, were optimized in the CWPO process for degradation of BPA in the PCW. In the best obtained experimental condition, at pH of 6.30, H2O2 dosage of 2.5 g/L, temperature of 70 °C and 100 mg/L of catalyst dosage, CWPO process exhibits the best catalytic performance with the complete BPA degradation, 68.78% of COD removal and 47.14% of TOC reduction for PCW being obtained. The role of hydroxyl radicals in the reaction mechanism was shown by indirect analysis i.e. tert Butanol (tBuOH) scavenging experiment. Under the optimum experimental conditions, the stability and reusability of the nanocomposite was demonstrated with slight decline (< 10% reduction) in the CWPO after four consecutive runs in terms of its catalytic activity. The fate of organic pollutants in the treated PCW by CWPO was identified by qualitative GC/MS analysis. The biodegradability of the treated PCW increased during the CWPO process with a 4-fold increase of the BOD5/COD ratio being obtained, namely from 0.1 (indicating non-biodegradability) to 0.43 (showing biodegradability by means of biological treatment) and AOS and COS were increased to 2.26 and 3.08, respectively. Overall, the CWPO process with magnetite TNT/CNT nanocomposite, due to the simple and easy in-situ catalyst recovery/ separation and good catalytic activity, can be considered as a promising destructive technology for industrial wastewater treatment.
- Wastewater purification using advanced functionalized nanoparticlesPublication . Noorimotlagh, Zahra; Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Mirzaee, Seyyed Abbas; Martínez, Susana Silva; Gomes, HelderEnvironmental pollution is rapidly increasing due to population growth, industrialization, urbanization, etc. Anthropogenic activities have increased pollution in all sections of the environment (i.e., soil, air, water, and wastewater). There is great importance attached to resolving this complicated situation, which could effectively reduce the negative impacts of anthropogenic activities on the environment. Nanotechnology, especially functionalized nanoparticles (FNPs), is emerging as an effective solution to environmental pollution at the global scale. The extraordinary chemical and physical properties of materials at the nanometer scale enable new and innovative applications in the environmental sector. Although manufactured metal-based NPs are being produced, concern about their toxicity is increasing. To resolve the toxicity of NPs, functionalization of the materials appears to be a possible solution. The functionalization of NPs, as well as the metal core, can be varied according to the problem being targeted. This chapter discusses detailed information about the fabrication methods of FNPs used for environmental purification, especially wastewater treatment. Their scope in the environment, which includes cleaning up existing pollution, is also discussed. A critical evaluation of the challenges and future needs for a safe environment are also explored.