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Mohammadhossein Rasoulifard,Mostafa Fazli,Mohammadreza Eskandarian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Present work involves the prospects of the kinetic study for photocatalytic degradation of Direct Red 23 using UV–LED/nano-TiO2/S2O8 2 procedure. Advantageously usages of UV–LEDs as illumination sources were collected to the advanced oxidation process in presence of immobilized nano-TiO2. Additionally, kinetic approach for various parameters in different conditions for decolorization has been studied. Results demonstrated that kinetic model of UV–LED/nano-TiO2/S2O8 2 process can effectively degrade DR23 dye with optimum conditions. A new kinetic model was suggested on the basis of intrinsic element reactions. The proposed kinetic model fairly resembled that dye decolorization was followed by the first order reaction.
Mohammadhossein Rasoulifard,Mostafa Fazli,Mohammad Reza Eskandarian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Effectiveness of the UV-Light emitting diodes (UV-LEDs) for degradation of Direct Red 23 (DR23) using an Advanced Oxidation Process (AOP), (UV-LED/S2O8 2) in a continuous photoreactor has been investigated in present work. The effects of operational parameters, such as, dye initial concentration, peroxydisulfate concentration, temperature and photonic efficiency were utilized for the decolorization of DR23. The most valuable characteristic of the present work was in using the controllable UV/LEDs as light illumination source, which provide the changing current intensity and examine the effect of irradiation efficiency. The optimum conditions for higher percentage degradation of DR23 dye were obtained with S2O8 2 (12.5 mM), dye concentration (20 ppm), 80% of current intensity.
Mohammadhossein Rasoulifard,Solmaz Valizadeh,Mir Saeed Seyed Dorraji 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
We evaluated the adsorptive/photodegradation properties of hydroxyapatite. Hydroxyapatite was synthesized by two different precipitation methods and examined for the removal of two kinds of textile dye. The physicochemical properties of the products were characterized using Fourier transform infrared, X-ray diffraction, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. The effects of different parameters, including hydroxyapatite synthesis method and removal process type, pH, reaction time, temperature and amount of hydroxyapatite, were investigated and optimized by Taguchi design. The kinetics of adsorption and isotherm studies showed that the pseudo-second-order model and the Freundlich isotherm were the best choices to describe the adsorptive behavior of hydroxyapatite. Photocatalytic degradation of dye followed Langmuir-Hinshelwood mechanism, illustrated a pseudo-first-order kinetic model with the adsorption equilibrium constant and kinetic rate constant of surface reaction equal to 0.011 (l mg−1) and 1.3 (mg l−1 min−1), respectively.
Saeideh Kamali Moghaddam,Mohammadhossein Rasoulifard,Morteza Vahedpour,Mohammadreza Eskandarian 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
The present work deals with the photooxidative degradation of tylosin antibiotic (TYL) in the presenceof potassium peroxydisulfate (K2S2O8) irradiated by UV-C in the presence of immobilized nano silver. Effects of pH,temperature, peroxydisulfate concentration and immobilized nano silver dosage on the degradation efficiency of TYLwere examined. Degradation efficiency was small when the oxidation was carried out in the absence of UV irradiation. Results showed that degradation of TYL increases with temperature, nano Ag and peroxydisulfate initial concentra-tion and decreases with pH. Due to UV/nano Ag/S2O82−processes, more than 90% of TYL can be degraded at roomtemperature in 35 min at an initial concentration of 50 mgl−1. Degradation reaction order of TYL by UV/nano Ag/S2O82−process is 1.89. Meanwhile, the initial rates of degradation in UV/nano Ag/S2O82−processes can be described well bythe Langmuir-Hinshelwood kinetic model.
Mohammad Reza Eskandarian,Mohammadhossein Rasoulifard,Mostafa Fazli,Leila Ghalamchi,최혁 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
To facilitate decomposition of imidacloprid (IMD), as a persistent probe insecticide, TiO2-Fe3O4 (TF) nanocomposite was synthesized and characterized. TF particles in size of 50-60 nm with band-gap of 2.8 eV were immobilized onto glass tubes and utilized as a photocatalyst irradiated with ultraviolet-light emitting diode (UV-LED) powered by photovoltaics. Synergistic decomposition of IMD in the photocatalytic reactor injected with persulfate (PS) was investigated. Along with various control and reference tests, parametric studies to evaluate the effects of PS concentration, IMD concentration, and circulation rate on IMD decomposition kinetics and electrical energy consumption were performed. The contribution of various physical and chemical mechanisms to IMD removal was discussed, including self-decomposition, direct photolytic decomposition, chemical oxidation by PS, photolysis of PS to produce sulfate radicals, Fenton-like reaction to produce sulfate radicals, photocatalysis to generate hydroxyl radicals, and adsorption onto catalysts. TF conjugated with PS under UV-LED synergistically decomposed IMD. Additionally, results demonstrated the synergy index factor of 75%, 65%, and 60% for IMD degradation by UV-LED/TF/PS, UV-LED/Fe3O4/PS, and UVLED/ TiO2/PS routes, respectively. Outcomes also showed that utilizing TF can greatly reduce electrical energy consumption. Since all devices used in this study, including UV-LED, were powered solely by a photovoltaic module, the immobilized TF photoreactor was proposed as a sustainable, self-powered, energy-saving, and practical point-of-use decontamination system to remove organic contaminants in water under solar radiation.
Mir Saeid Seyed Dorraji,Hamid Reza Ashjari,Mohammadhossein Rasoulifard,Mehrdad Rastgouy-Houjaghan 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
A new way to synthesize open cell polyurethane foam using cadmium ions has been described. By converting to cadmium sulfide nanoparticles, cadmium ions have been fixed on the open cell polyurethane foam. Open cell polyurethane foam containing CdS nanoparticles (PUF-CdS) was characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The SEM results showed foam containing nanoparticles unlike pure foam (PUF) has an open cell structure. In the following, the applicability of synthesized nanocomposite in wastewater treatment was investigated. The dye removal efficiency of PUF-CdS was investigated with the objective of removing Reactive Orange 122 (RO122) as a model pollutant from aqueous solution. The effects of adsorbent dosage, initial dye concentration and initial pH of solution on RO122 removal were studied. Kinetics and equilibrium isotherms for adsorption of dye on PUF-CdS were analyzed. The maximum adsorption capacity obtained from Langmuir isotherm equation was 22.7 mg g−1. The experimental data were adjusted to the pseudo-second-order kinetic model. The antibacterial activity of PUF-CdS was also investigated against E. coli and S. aureus.
Thin film composite on sulfonated PVDF electrospun and its performance in nanofiltration
Omid Qanati,Zahra Dusti,Mir Saeed Seyed Dorraji,Arsalan Ahmadi,Mohammadhossein Rasoulifard 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.5
Thin-film composite membranes (TFC) have attracted great attention in the field of seawater and wastewater treatment. A novel nanofiltration membrane was fabricated via interfacial polymerization of meta phenylene diamine (MPD) and 1,3,5-benzene tricarbonyl chloride (TMC) on the surface of a recently developed nanofibrous mat from sulfonated PVDF (S-PVDF). Chlorosulfonic acid was used to sulfonate PVDF powder, and new peaks on 1HNMR and FT-IR techniques confirmed the preparation of S-PVDF. Using solutions of NaCl, CaCl2, MgSO4, and Na2SO4, a filtration trial was performed with dead-end filtration equipment. The results demonstrated that sulfonation of PVDF decreased the water contact angle from 137.1 for intact PVDF to 85.5 for S-PVDF/PVDF (50/50). In addition, it reduced the mean diameter of nanofibers from 300 to under 130 nm and, consequently, smaller pores with a mean size of around 90 nm were formed. The membrane containing 10% S-PVDF had the highest steady pure water flux by 25.5 L/m2h and exhibited higher rejection of bivalent and univalent salt ions (>97% bivalent and >88% univalent) with the sensible flow. The electrospun nanofibrous S-PVDF/PVDF proved to be a usable supporting material with a higher hydrophilic character that makes electrospun mats an interesting option for liquid treatment.