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RISS 인기검색어
- 검색키워드
- 저자 : Nazanin Nasrollahi (검색결과 4 건)
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Photocatalytic-membrane technology: a critical review for membrane fouling mitigation
Nazanin Nasrollahi,Leila Ghalamchi,Vahid Vatanpour,Alireza Khataee 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-
The present paper provides an overview of the hybrid photocatalytic-membrane process and its newproperties such as permeability, hydrophilicity, rejection, antifouling and photodegradation efficiency. The integration of photocatalysts and membranes could be occurred in three major stepsfirstlyphotocatalysts mixed matrix membranes, secondly photocatalysts immobilized on the surface ofmembranes, and thirdly membranes for the separation of photocatalysts from their suspensions. Different combinations of photocatalysts (TiO2, CuO or ZnO) and membrane processes are presented andcharacterized in the review paper. Positive or negative effect of different configurations of photocatalysisand membrane processes are discussed on the antifouling and antibacterial properties of themembranes. This review outlines the coupling of photocatalysts with the membranes can reduce thefouling of the membranes due to three mechanisms: elevation of membrane hydrophilicity, induction ofantibacterial properties and degradation of foulants by produced radicals. However, reactive radicals candestroy polymeric membranes. Moreover, a short introduction to the photoelectrocatalysts is presentedcombined with membrane processes.
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Nazanin Nasrollahi,Maryam Yousefpoor,Alireza Khataee,Vahid Vatanpour 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Nowadays, reaching a membrane with good mechanical/thermal properties, biocompatibility, and industrialapplication is a big challenge in science and technology. Polyurethane (PU) has been known as apolymer with excellent and distinct properties, such as biodegradability, biocompatibility, and also exclusivechemistry can be considered an important part of a membrane, especially in polymeric ones. Therefore, this review aims to introduce polyurethane and urea bond properties, structures, and chemistryand then review studies related to the polymeric separation of membranes. It is expected thatthe versatility of polyurethane in various states from flexible to rigid and from compact to foamed, whichcan be produced easily through selecting various starting materials, makes it a suitable target to be usedin various membrane applications. This review also highlights the synthesis methods of polyurethane andrelated membranes and considers the role of chain extenders and some fillers in changing the propertiesof polyurethane polymeric membranes in various categories such as exchange membranes, distillationmembranes, thin-film composite membranes, gas separation membranes, and ultrafiltration, nanofiltrationand microfiltration membranes. Other synthesized polyurethane-based membranes are introducedbriefly and some prospective about the future of polyurethane is mentioned in the end.
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Nazanin Nasrollahi,Leila Ghalamchi,Vahid Vatanpour,Alireza Khataee,Maryam Yousefpoor 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
One of the basic challenges in polymeric membrane fabrication is the control of pore size and the porosityof the membranes. In this review paper, the role of polymeric additives is overviewed in membrane fabricationprocesses, such as the formation of pores in membranes, increasing permeability, hydrophilicityand even the creation of a desirable property such as antifouling and antibacterial properties. The polymericadditives could dissolve in water during the phase inversion process (a pore forming agent) orremain in the membrane matrix (hydrophilic and antifouling agent) or could have both roles. The additivescould also act as proton exchanger and gas transport facilitating agents. This review concentrates onthe introduction of new polymeric additives. In the blended membranes, the miscibility of chosen polymericadditives at the molecular levels make it a challenge to use the modification method. Molecularinteractions between polymers such as hydrogen bonding and charge transfer play the main roles ofthe quality of blending. Different methods of polymer/co-polymer addition to the polymeric matrix ofmembranes are investigated to identify the best polymeric additives in various types of polymeric membranesincluding: pervaporation, contactor membrane, distillation membrane, etc. Moreover, the mixabilityof the additive polymer with the matrix polymer solution and the effectiveness of somefunctional additives are described in this review.
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Ahmad Tavasoli,Saba Karimi,Maryam Davari,Nazanin Nasrollahi,Tahereh Nematian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Alkalized MoS2 nanocatalysts supported on carbon nanotubes (CNTs) is prepared using microemultiontechnique with water-to-surfactant ratios of 1–4. The nanocatalysts were extensively characterized bydifferent methods and their activity and selectivity in higher alcohols synthesis (HAS) been assessed in afixed bed micro-reactor. The physico-chemical properties and performance of the nanocatalysts werecompared with the catalyst prepared by impregnation method. Very narrow particle size distributionhas been produced by the microemulsion technique at the relatively high loading of active metal(15 wt.% Mo). The TEM images showed that small Mo nanoparticles are confined inside the CNTs and theon the outer surface of the CNTs (2–7 nm). Using microemultion technique with water to surfactant ratioof one; the average MoO3 particle sizes decreased to 4.5 nm, the %dispersion increased to 60.75 and the%reduction increased by 43%. Also, the chemical interactions between K–Mo–O species increased,enhancing the conditions for the formation of alcohols. Activity and selectivity were found to bedependent on the catalyst preparation method and water to surfactant ratio. The %CO conversionincreased to 43.8%. The CNTs-supported MoO3–K2O nanocatalyst synthesized by the proposedmicroemulsion technique with water to surfactant ratio of one, decreased the hydrocarbons selectivityto 21.98% and increased the alcohols selectivity to 65.21%. Finally, using microemultion methoddramatically decreased the methanol selectivity and increased ethanol and other higher alcoholsselectivities.
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