Correction to: Purification of textile wastewater by using coated Sr/S/N doped TiO2 nanolayers on glass orbs

Rozita Foulady Dehaghi,Mohsen Behpour,Noshin Mir 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.8

In Scheme 1 in the original publication, “Basic Blue 28” should be replaced with “Basic Blue 41”. The corrected scheme appears below: In the original publication, the charges of all the resonance forms in Scheme 2(b) and 2(c) should be positive. Also, the corresponding explanation of this scheme which is placed in paragraph 3, page 7 should be corrected. The corrected scheme and paragraph appears below and the changes to the paragraph are shown in bold: Moreover, it can be observed that Basic Yellow 28 is more degraded at acidic pH=2 than two other dyes. This difference could be attributed to the possible resonance forms of three different dyes (Scheme 2). By drawing two different resonance forms of the dyes, it is observed that all dyes have two different resonance forms which both of them are cationic. It is more likely that in acidic pH, the instantly cationic structures of two later dyes are absorbed on TiO2 surface with positive potential zeta due to their bigger size and high charge distribution and be degraded. Thus, it is observed that in acidic pH, Basic Red 46 and Basic Blue 41 dyes are more degraded than Basic Yellow 28 dye.

Purification of textile wastewater by using coated Sr/S/N doped TiO2 nanolayers on glass orbs

Rozita Foulady Dehaghi,Mohsen Behpour,Noshin Mir 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.7

Simultaneous doping of TiO2 nanoparticles with three elements including Sr, S, and N is reported. The resulting material shows superior photocatalytic performance toward degradation of textile waste under visible and sunlight. The pure and doped TiO2 nanolayers were prepared by sol-gel method and were fixed on a bed of glass orbs. The immobilized TiO2 were characterized by a variety of techniques: X-ray diffraction (XRD), scanning electron microscopy (SEM), spectroscopy diffusion reflection (DRS), energy dispersive X-ray spectrometry (EDS) and elemental analysis (CHNS). The photocatalytic activity of the prepared fixed-bed materials toward degradation of the textile wastes was determined by using ultraviolet-visible spectroscopy (UV-Vis) and measurement of the chemical oxygen demand testing (COD). The best photocatalytic activity was observed with the use of Sr/S/N-TiO2 nano-layers. Afterwards, the experimental conditions were optimized by tuning reaction parameters, including amount of doped metal ion on photocatalyst structure, sample solution pH and photoreactor output flow rate. The results confirmed that at natural pH 5.9 of sample solution, maximum decomposition of 91-99% of azo dyes was obtained in 8 h under visible irradiation. Finally, the experiments were repeated under 1.5 AM sunlight with high volume of reactants in order to confirm the cost-effectiveness of the designed photocatalyst.

Surfactant effect on synthesize of BaAl2O4 nanoparticles prepared by reverse micelle process

Azita Moheb,Saeid Abedini Khorramie,Shahram Moradi Dehaghi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3

Barium aluminate (BaAl2O4) spinel nanoparticles were prepared by a reverse micelle method using micro-reactors made ofdifferent nonionic surfactants (Span 20, Span 40 and Span 60) in a nonpolar solvent benzene. The synthesized nanomaterialswere characterized by X-ray diffraction (XRD) technique. The morphology of the synthesized materials was studied by fieldemission scanning electron microscope (FESEM). Particle size was estimated by XRD and transmission electron microscope(TEM) with using software of ImageJ. The effect of different surfactants on the particles size and morphology was determined. The results revealed, that particle size was increased by decreasing HLB (Hydrophilic-Lipophilic Balance) of surfactants andalso particle size was increased from 23 to 35 nm. HLB of surfactants is a major factor in controlling the final particles sizeof BaAl2O4 powder. The X-ray powder diffraction analysis indicated, all the formation of hexagonal phase on calcinations. Dislocation of peaks (2θ) in XRD with decreasing HLB of surfactant was decreased slightly.

Evaluation of Eu/Dy ratio on Nd-doped SrAl2O4 and their role on luminescence properties

Seyed Mohsen Mousavi,Shahram Moradi Dehaghi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3

The purpose of this study was production of photoluminescent pigments by adding different ratios of Eu/Dy to SrAl2O4: Nd3+composites. Presence of Eu and Dy in the pigments, alone or together causes varying fluorescence and phosphorescenceproperties regarding their emission intensity and afterglow length. The resulted differences in morphology and crystalstructure of these pigments were measured by spectroscopic methods. The interesting fact in this work is the emission typeof the pigments before and after the reduction process; as the pigments were white powders showing strong red emission underUV irradiation and after the reduction process, they showed strongly visible afterglows. Six samples with different Eu/Dyratios were synthesized and named samples N1 to N6. They underwent the thermal reduction process and the resultingsamples were named N1A to N6A. The phosphorescence analysis showed an intensity count of 518 for sample N6A, thefluorescence showed an intensity of 797 counts for sample N6A, and the sample N4A showed an afterglow time of about 5 hwith a strong initial afterglow of about 20 minutes.

Surfactant effect on synthesize of SrAl2O4 nanoparticles prepared by reverse micelle process

Azita Moheb,Saeid Abedini Khorramie,Shahram Moradi Dehaghi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.2

Strontium aluminate (SrAl2O4) spinel nanoparticles were synthesized by microemulsion method using micro-reactors made ofdifferent nonionic surfactants (Span 20, Span 40 and Span 60) in a nonpolar solvent cyclohexane. The synthesizednanomaterials were characterized by X-ray diffraction (XRD) technique. The morphology of the synthesized materials wasstudied by field emission scanning electron microscope (FESEM). The average particles size was estimated by XRD andtransmission electron microscope (TEM) with using software of IMAGE J. The effect of different surfactants on the particlessize and morphology was determined. It was found that the average particles size was decreased by decreasing HLB(Hydrophilic-Lipophilic Balance) of surfactants and also the average particles size was decreased from 31 to 21 nm. HLB ofsurfactants is a major factor in controlling the final particles size of SrAl2O4 powder. Dislocation of peaks (2θ) in XRD withdecreasing HLB of surfactant was decreased slightly. The XRD analysis of all the powders indicated the formation of singlephasespinel structure on calcinations.

Preparation and Characterization of Magnetite-Bentonite Nano Composites from Native Bentonite Mines of Kerman-Iran

Rouhollah Soltani Goharrizi,Lobat Taghavi,Amir Sarrafi,Abdolreza Karbasi,Shahram Moradi Dehaghi 한국자기학회 2018 Journal of Magnetics Vol.23 No.2

Bentonite is a kind of crystalline clay mineral with the major constituent of montmorillonite. Bentonite mines should be investigated in different areas with different climatic and environmental conditions. Kerman, is a province in the southeast of Iran famous for its rich resources of bentonite mines. In the present study, the physical and chemical characteristics of the supplied bentonites from three different mines of Kerman (Kheirabad, Tang-e Quchan and Horjand) were investigated. Kheirabad sodium bentonite sample was selected as a potent adsorbent of organic and inorganic pollutants due to high swelling index. Besides, magnetite nano composites were synthesized by stabilizing Fe₃O₄ nanoparticles on desired bentonite. The properties of nanocomposites were studied using FTIR, XRD, VSM, BET and TEM analyses.

The Effect of Occupational Noise Exposure on Serum Cortisol Concentration of Night-shift Industrial Workers: A Field Study

Zare, Sajad,Baneshi, Mohammad R.,Hemmatjo, Rasoul,Ahmadi, Saeid,Omidvar, Mohsen,Dehaghi, Behzad F. Occupational Safety and Health Research Institute 2019 Safety and health at work Vol.10 No.1

Background: In both developed and developing countries, noise is regarded as the most common occupational hazard in various industries. The present study aimed to examine the effect of sound pressure level (SPL) on serum cortisol concentration in three different times during the night shift. Methods: This case-control study was conducted among 75 workers of an industrial and mining firm in 2017. The participants were assigned to one of the three groups (one control and two case groups), with an equal number of workers (25 participants) in each group. Following the ISO 9612 standard, dosimetry was adopted to evaluate equivalent SPL using a TES-1345 dosimeter. The influence of SPL on serum cortisol concentration was measured during the night shift. The serum cortisol concentration was measured using a radioimmunoassay (RIA) test in the laboratory. Repeated measure analysis of variance and linear mixed models were used with ${\alpha}=0.05$. Results: The results indicated a downward trend in the serum cortisol concentration of the three groups during the night shift. Both SPL and exposure time significantly affected cortisol concentration (p < 0.0001, p < 0.0001). Conversely, age and body mass index had no significant influence on cortisol concentration (p = 0.360, p = 0.62). Conclusion: Based on the obtained results, increasing SPL will lead to enhancement of serum cortisol concentration. Given that cortisol concentration varies while workers are exposed to different SPLs, this hormone can be used as a biomarker to study the effect of noise-induced stress.

Efficiency evaluation of the photocatalytic degradation of zinc oxide nanoparticles immobilized on modified zeolites in the removal of styrene vapor from air

Hossein Ali Rangkooy,Mojtaba Nakhaei Pour,Behzad Fouladi Dehaghi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.12

Styrene monomer is a volatile organic compound that has many applications in plastics, rubber, and paint manufacturing industries. Exposure to styrene vapor has certain effects, including suppression of the central nervous system, loss of concentration, weakness and fatigue, and nausea and there is a possibility of carcinogenesis in long-term exposure. Therefore, it is necessary to control and eliminate this vapor. The aim of this study was to investigate the performance of zinc oxide nanoparticles on modified natural zeolites in removing styrene vapor from the air. Natural zeolites of clinoptilolite were modified using hydrochloric acid and diphenyldichlorosilane. Next, zinc oxide nanoparticles with different ratios of 3, 5, and 10wt% were stabilized on the zeolites. To determine their characteristics, samples were used from BET, SEM and XRD analyses. The input styrene concentration and the ratio of nanoparticles stabilized on zeolites were studied as effective functional parameters on the removal process. The efficiency results of natural zeolites (Ze) and modified zeolites (Mze) in styrene adsorption from the air show that the styrene breakthrough in the bed of MZe compared to that of Ze increases approximately two times. Also, the results showed that the removal by the process of UV/MZe-ZnO 3%, UV/MZe-ZnO 5%, and UV/MZe-ZnO 10%, was 36.5%, 40%, and 26%, respectively. From the results it can be concluded that MZe can increase the efficiency of photocatalytic degradation. Clinoptilolites of Iran can be used as an adsorbent to remove polluted air in industries that have low concentrations and flow rates.

The Effect of Occupational Noise Exposure on Serum Cortisol Concentration of Night-shift Industrial Workers: A Field Study

Sajad Zare,Mohammad R. Baneshi,Rasoul Hemmatjo,Saeid Ahmadi,Mohsen Omidvar,Behzad F. Dehaghi 한국산업안전보건공단 산업안전보건연구원 2019 Safety and health at work Vol.10 No.1

Background: In both developed and developing countries, noise is regarded as the most common occupational hazard in various industries. The present study aimed to examine the effect of sound pressure level (SPL) on serum cortisol concentration in three different times during the night shift. Methods: This caseecontrol study was conducted among 75 workers of an industrial and mining firm in 2017. The participants were assigned to one of the three groups (one control and two case groups), with an equal number of workers (25 participants) in each group. Following the ISO 9612 standard, dosimetry was adopted to evaluate equivalent SPL using a TES-1345 dosimeter. The influence of SPL on serum cortisol concentration was measured during the night shift. The serum cortisol concentration was measured using a radioimmunoassay (RIA) test in the laboratory. Repeated measure analysis of variance and linear mixed models were used with a ¼ 0.05. Results: The results indicated a downward trend in the serum cortisol concentration of the three groups during the night shift. Both SPL and exposure time significantly affected cortisol concentration (p < 0.0001, p < 0.0001). Conversely, age and body mass index had no significant influence on cortisol concentration (p ¼ 0.360, p ¼ 0.62). Conclusion: Based on the obtained results, increasing SPL will lead to enhancement of serum cortisol concentration. Given that cortisol concentration varies while workers are exposed to different SPLs, this hormone can be used as a biomarker to study the effect of noise-induced stress.