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Alireza Nezamzadeh-Ejhieh,Fatemeh Khodabakhshi-Chermahini 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
ZnO was incorporated into nano particles of clinoptiloite by ion exchanging the zeolite in a zinc nitrateaqueous solution followed by calcinations process. All raw and modified samples were characterized byXRD, FT-IR, DRS, TG-DTG, SEM, BET and TEM. The prepared catalyst was used in the photocatalyticdegradation of phenylhydrazine (PHZ) and the best experimental parameters were obtained as:0.25 g L-1 of the catalyst, 20 ppm pollutant concentration and pH = 8. The degradation extent wasmonitored by UV–vis spectroscopy and the results were confirmed by HPLC and the chemical oxygendemand (COD).
Photocatalytic degradation of 4-nitrophenol with ZnO supported nano-clinoptilolite zeolite
Alireza Nezamzadeh-Ejhieh,Setareh Khorsandi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Photocatalytic degradation of 4-nitrophenol aqueous solution was investigated using ZnO/nano-clinoptilolite zeolite under UV irradiation. Nano-powders of clinoptilolite were prepared using aplanetary ball mill mechanically method. The photocatalyst was prepared by ion exchanging of nano-clinoptilolite in a 0.1 M zinc nitrate aqueous solution for 24 h followed by calcination at 450 ℃ for 12 h. Samples were characterized by XRD, FT-IR, DRS, AAS, TG/DTG, SEM, TEM and BET. Effects of various keyoperating parameters on the degradation rate were studied. The COD and HPLC tests were also used toconfirm the degradation extent of the pollutant.
Alireza Nezamzadeh-Ejhieh,Zahra Ghanbari-Mobarakeh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Photocatalytic degradation of 2,4-dichlorophenol was studied using FeO-doped onto nano-particles ofzeolite P (FeO–NP). FeO/NP was prepared by ion exchange and calcination procedures. The samples werecharacterized by FT-IR, SEM and DRS. UV–vis, HPLC and COD were employed to calculate the degradationextent of the pollutant. The results confirmed that the degradation efficiency of the method stronglydependent to experimental parameters such as: pH, catalyst concentration, substrate concentration,active component value (FeO) loading, presence of H2O2 and inorganic Cl and SO42 anions. The firstorderkinetics model was used to study the kinetics of the method.
Alireza Nezamzadeh-Ejhieh,Hamidreza Zabihi-Mobarakeh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
CuO was incorporated into nano-particles of clinoptilolite via ion exchange and calcination processes. The obtained composite (CuO-NCP) was used for the photodeclorization process of an aqueous mixture of Methylene Blue and Bromophenol Blue. All samples were characterized by FT-IR, XRD, DRS, SEM and SEM. The optimum conditions were approximated as: 7 ppm dyes, pH 5.9, catalyst dose of 0.2 g L-1 and CuO loading of 4.9%. The declorization extents of 61% and 32% were respectively obtained for MB and BPB during 180 min irradiation. The degradation extent was monitored by UV–vis spectroscopy and confirmed by chemical oxygen demand (COD).
Alireza Nezamzadeh-Ejhieh,Pouya Pouladsaz 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Carbon-paste electrode modified with Co2+-Y zeolite was used in voltammetric determination of riboflavin. Maximum anodic voltammetric current, due to the redox behavior of Co2+ ions, was observed in 0.1 mol L-1 KNO3 with pH 5. The modified electrode showed a catalytic behavior in electro-oxidation of riboflavin, lowering the over-potential of the reaction by ~200 mV. The effect of several parameters such as pH and concentration of the supporting electrolyte was investigated. The cyclic voltammetric response of the electrode to riboflavin was linear in the range of 1.7 to 34 mmol L-1 with a detection limit of 0.71 mmol L-1.
Alireza Nezamzadeh-Ejhieh,Elahe Shahriari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The potential of Fe(II)-orthophenantroline photocatalyst, doped on zeolite Na-Y via complexation process, was studied in decolorization of methyl green. The characterization of samples was studied using XRD, FT-IR, TG/DTG and SEM methods. The best photodecolorization efficiency was obtained at: 1 g L 1 catalyst, 40 ppm MG, pH: 9 using catalyst containing 7 mg per gram catalyst. The degradation process obeyed first-order kinetics. The reusability of the intended catalyst was also investigated. Homogeneous photodecolorization using unsupported complex does not significant role in photodecolorization of the dye, which confirms the importance of zeolitic support to prevent the aggregation of complex particles.
Alireza Nezamzadeh-Ejhieh,Mehri Shahanshahi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Clinoptilolite was pretreated by mechanical ball-milling method to obtain nano particles and it was modified by hexadecylpyridynium bromide (HDPBr) surfactant to prepare a surfactant modified zeolite (SMZ) as an effective anion exchanger. The obtained SMZ was used as the active ingredient of a PVC membrane electrode which showed the best Nernstian response toward dichromate in the used conditions. The proposed electrode showed linear response in the concentration range of 1.0 x 10-5 to 5.0 x 10-2 mol L-1 dichromate with a detection limit of 5.0 x 10-6 mol L-1 at pH = 3–6 and a Nernstian slope of 29.9 ± 0.9 mV per decade of dichromate concentration.
Alireza Nezamzadeh-Ejhieh,Neda Moazzeni 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Photocatalytic activity of CuS incorporated into an Iranian clinoptilolite (CuS-Cp) was studied for decolorization of a mixture of Methyl Orange and Bromocresol Green under sunlight irradiation. All samples were characterized by XRD, FTIR, DRS and TG/DTG techniques. The effect of some key experimental parameters such as: amount of the catalyst (0.05–5 g L-1), initial concentration of dyes (5–30 mg L-1), solution pH (1–11) and also dosage of H2O2 and KBrO3 was studied on the decolorization extent. The extent of decolorization was estimated from the residual concentration by spectrophoto-metrically and it was confirmed by the reduction of chemical oxygen demand (COD).
Arezou Naghash,Alireza Nezamzadeh-Ejhieh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
Clinoptilolite (CP) and its modified forms with two cationic surfactants (HDTMA-Br and HDP-Br) wereused to remove phosphate as an important anionic environmental contaminant using batch andcontinuous methods. The modification was analyzed by FT-IR and DTG characterization techniques. Theeffects of some interfering anions on the removal extent of phosphate were investigated and moreinterference was observed by arsenate so the removal extent of phosphate decreased to 0.3 mmol/kg. The removal efficiency of phosphate confirmed that HDTMA-modified zeolite (SMZ-HDTMA) was moreefficient than HDP-modified zeolite (SMZ-HDP). DG values of 6.4, 9.5 and 12.0 kJ/mol for the raw CP,SMZ-HDP and SMZ-HDTMA, respectively, confirm that the removal reaction of phosphate is spontaneousfor the raw and modified sorbents. Results of study of pH showed that stronger basic pHs are suitable forremoval of phosphate by the raw and modified adsorbents so the removal efficiencies of 8.1, 376 and675 mmol/kg were, respectively, obtained for CP, SMZ-HDP and SMZ-HDTMA at pH 12.
Hamidreza Zabihi-Mobarakeh,Alireza Nezamzadeh-Ejhieh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Clinoptilolite nanoparticles (NCP) were used to increase the photocatalytic activity of TiO2 in the photodegradation of mixture of aniline (AN) and 2, 4-dinitroaniline (DNAN) aqueous solution. The photocatalyst was prepared via calcinations process followed by the ion exchanging of NCP in 0.1 M of ammonium titanyl oxalate monohydrate. Samples were characterized by FT-IR, XRD, DRS and SEM. The degradation extent of the pollutants was calculated by changes in the UV–vis absorbencies of the pollutants at lmax 280 nm for AN and 360 nm for DNAN. The optimal conditions were as: 10 ppm with respect to each pollutant, pH 5.8, catalyst dose of 0.1 g L1 and contact time of 6 h.