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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Nickel,Cadmium,Dendrimer
- چکیده:
- چکیده انگلیسی: Numerous heavy metals such ascadmium and nickel are toxic present in industrial wastewater and could cause severe damage to living organisms. These compounds are considered to be common contaminants, which are discharged into water resources and cause major environmental problems. Due to the excessive toxicity of heavy metals even at low concentrations, they also threaten human health. Therefore, it is essential to remove these elements from wastewater before discharge into the environment. The present study aimed to evaluate the adsorption of cadmium and nickel from aqueous solutions using poly (propyleneimine) (PPI) dendrimer, as well as the influential factors such as pH, PPI dosage, and the initial concentration of cadmium and nickel using a batch model. To assess the mechanism of adsorption and calculate the maximum adsorption values, the Langmuir and Freundlich isotherms were used. The findings indicated that increased pH and adsorbent dosage improved the removal efficiency. In contrast, increased heavy metal ion concentrations decreased the adsorption. According to the dynamic light scattering analysis, the mean diameter of the PPI dendrimer was 1-10 nm, and the maximum adsorption of both heavy metal ions occurred at the pH of seven. In addition, the maximum uptake of cadmium and nickel was attained with the adsorbent dosage of 0.08 g/l. The maximum removal capacities of the PPI dendrimer for nickel and cadmium were estimated at 1,428 and 1,225 mg/g, respectively.
- انتشار مقاله: 15-02-1397
- نویسندگان: Roya Ebrahimi,Bagher Hayati,Reza Rezaee,Behzad Shahmoradi,Mahdi Safari,Shivaraju Harikaranahalli Puttaiah,Afshin Maleki
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Chitosan,Modification,adsorbent,magnetic iron nanoparticles
- چکیده:
- چکیده انگلیسی: Absorption is a common technology used for water and wastewater treatment since it is often fast and efficient, while costly at the same time. Therefore, the development of low-cost and efficient adsorbents has led to the rapid growth of research interest in this regard. Chitosan is a natural polyaminosaccharide with effective adsorption properties, which is applied to remove various pollutants. However, it has low efficiency in the adsorption of some pollutants, and its separation from aqueous solutions is difficult as well. Therefore, modification of chitosan has been recommended to address this issue. The present study aimed to synthesize nanosized chitosan-magnetic iron particles and determine their properties. Magnetic iron nanoparticles were fabricated using the chemical precipitation method, and magnetic chitosan was prepared. Several methods were applied to assess the properties of the synthesized adsorbent, including scanning electron microscopy, X-ray diffraction, atomic force microscopy, Fourier-transform infrared spectroscopy, dynamic light scattering, and zeta potential. Chitosan-magnetic iron nanoparticles had higher surface roughness and irregular pores, and the magnetic iron nanoparticles were successfully embedded in chitosan. Due to the surface charge of the chitosan-magnetic iron nanoparticles, it could be used as an effective adsorbent for the removal of contaminants with negative charge and their complete separation from aqueous solutions using magnets.
- انتشار مقاله: 27-03-1397
- نویسندگان: Elham Mohammadi,Hiua Daraei,Saeed Dehestani Athar,Shiva Zandi,Afshin Maleki
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Biomonitoring,Breast milk,Marivan,Nursing Women,Organochlorine pesticides
- چکیده:
- چکیده انگلیسی: The present study aimed to assess the levels of organochloride pesticides (OCPs) in the human breast milk obtained from the nursing women admitted for delivery to a hospital in Marivan county, located in Kurdistan, Iran. Milk samples were collected from 30 women. Gas chromatography analysis was performed using a Dani 1000 (Italy) gas chromatograph equipped with the Ni electron capture detector (ECD). The findings showed the high concentrations of OCPs in the samples. On the other hand, DDTs were ranked as the most abundant OCPs, followed by HCHs and HCBs, with the concentrations estimated at 2,345, 2,617, and 570 ng/g lipid/wt, respectively. Therefore, it could be concluded that the tested women might have been exposed to OCPs. However, further investigation is required on larger sample sizes to take proper measures.
- انتشار مقاله: 19-08-1397
- نویسندگان: Behzad Shahmoradi,Afshin Maleki,Shadi Kohzadi,Jamshid Khoubi,Shiva Zandi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Doping,Nanocomposite,Graphene
- چکیده:
- چکیده انگلیسی: Zinc oxide (ZnO) is a promising metal oxide semiconductor with various applications, especially in the photocatalytic destruction of environmental pollutants. However, this nanoparticle has some limitations, such as poor dispersion, aggregation, and a wide energy gap. As such, the doping of metal oxide semiconductor has been strongly recommended. Addition of manganese (Mn) has proven effective in resolving these issues. On the other hand, addition of carbon-based materials (e.g., graphene) could improve the stability and photocatalytic efficiency of ZnO. Graphene oxide acts as an electron- transport and electron-acceptor agent, controlling the charge transfer in the ZnO/graphene nanocomposite interface. The present study aimed to synthesize manganese-doped graphene/ZnO nanocomposites and determine its structural properties. Some techniques were employed to characterize the prepared composites, including scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), dynamic light scattering (DLS), and zeta potential analysis. According to the FTIR analysis, the peak in the range of 3467 cm-1 was due to the presence of zinc groups in the graphene structure, and the peak observed at 439 cm-1 also indicated the presence of Mn in the compound. Furthermore, the results of AFM analysis showed that graphene to be a layered sheet with the mean thickness of 1.48 nanometers. The results of the DLS analysis showed the mean diameter of GO-ZnO-Mn to be 37 nanometers, which reduced after graphene modification. According to the findings, addition of Mn and ZnO to graphene could effectively result in doping.
- انتشار مقاله: 31-03-1397
- نویسندگان: Mahnaz Mohammadi,Afshin Maleki,Shiva Zandi,Ebrahim Mohammadi,Esmail Ghahramani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Doping,nanoparticle,Zinc oxide,Hydrothermal Synthesis,Semiconductor,Tungsten-Doped ZnO
- چکیده:
- چکیده انگلیسی: Hexagonal-structured zinc oxide (ZnO) is a semiconductor material with various industrial and cosmetic applications. Some of the main limitations of ZnO are aggregation, poor dispersibility, and wide energy gap, which limit its efficiency in some applications. The present study aimed to synthesize tungsten (W)-doped ZnO nanostructures using a hydrothermal method and characterize the particles to discover their application potency in various fields. To do so, 0.5%, 1.0%, and 2.0% of tungsten oxide (WO) were incorporated into the structure of ZnO, and the properties of the particles were determined via SEM, XRD, FTIR, AFM, DLS, and UV-Vis spectroscopy and zeta potential analysis. According to the obtained SEM images and XRD patterns, the prepared particles possessed hexagonal, non-aggregated structures. Furthermore, the UV-Vis spectra and AFM micrograms indicated that the doping of the ZnO nanostructures with tungsten caused a spectral shift in the absorbance of ZnO nanoparticles from the UV region to the visible light spectrum, increasing their relative roughness. According to DLS analysis, doping decreased the particle size of ZnO. In general, our findings demonstrated that the doping of ZnO nanostructures with tungsten could promote their efficiency and applicability in the treatment of environmental pollutants.
- انتشار مقاله: 12-03-1397
- نویسندگان: Yahya Zandsalimi,Behzad Shahmoradi,Saeed Dehestani Athar,Afshin Maleki
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Clinoptilolite,Direct Red 23,Acid Modification
- چکیده:
- چکیده انگلیسی: Dyes are an important class of pollutants which when discharged into water resources can be toxic to the aquatic environment and cause serious problems for public health. Various treatment technologies such as adsorption are in use. For this reason, clinoptilolite was used as a low-cost adsorbent to remove color from aqueous solution. Clinoptilolite was modified with sulfuric and phosphoric acids in order to adsorp aqueous direct red 23. The batch adsorption experiments used dye concentrations ranging from 50 to 200 mg/L. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier transform infrared spectra (FTIR) were used to determine properties of clinoptilolite. To evaluate the experimental data, adsorption isotherms and kinetics were studied. The results showed that experimental data followed both Langmuir and Freundlich isotherms, with a correlation coefficient of 0.95–0.99. Kinetic studies showed that adsorption followed pseudo first-order kinetics. The adsorption results showed that acid-modified clinoptilolite with maximum adsorption capacity of 0.0009 mmol/g was a superior adsorbent compared with unmodified clinoptilolite, according to Langmuir equation. It caused adsorption efficiency in terms of Si/Al ratio 7.5 after 200 min of contact of between 31% to 60%. According to the Dubinin-Radushkevich isotherm model, mean free energy of adsorption (8.2–8.9 kJ/ mol) means that adsorption might follow a weak chemisorption mechanism. We conclude that adsorbing properties of clinoptilolite, a cheap and abundant adsorbent, can be improved and used for removing dyes from wastewater.
- انتشار مقاله: 01-03-1397
- نویسندگان: Roya Ebrahimi,Afshin Maleki,Behzad Shahmoradi,Reza Rezaee,Hiua Daraei,Mahdi Safari,Yahya Zandsalimi,Pegah Bahmani,Shivaraju Harkaranahalli Puttaiah
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Water,Arsenic species,ICP-AES,Total arsenic,Babagorgor fountain,SDDC
- چکیده:
- چکیده انگلیسی: Since Babagorgorfountain in the Ghorveh city of Kurdistan province is located in the arsenic belt of Iran, to raise awareness about the quality of drinking water from this fountain the concentration of arsenic and other heavy metals as well as other physicochemical parameters were investigated to protect the public health. In this study, water samples were collected from Babagorgorfountain. Arsenic in the water was measured by field and laboratory methods. Its concentration was estimated to be more than 500 ppb in a field method and 596 ppb in a SDDC method with absorbance measurements at 520 nm. The SDDC method can measure arsenic species separately and the concentration of arsenite and arsenate were found to be 239 and 357 ppb, respectively. Other physiochemicalparameters and heavy metals in the fountain water were evaluated according to standard methods. According to the World Health Organization guidelines the maximum safe level of arsenic in drinking water is 10 ppb. The concentration of arsenic in this fountain’s water is estimated at 60 times the limit and therefore its use is very dangerous for public health.
- انتشار مقاله: 13-06-1396
- نویسندگان: Mohammad Ahmadi Jebelli,Afshin Maleki,Mohammad Ali Amoozegar,Enayatollah Kalantar,Behzad Shahmoradi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Fe2O3,Nanofibrous,Electrospun,PAN
- چکیده:
- چکیده انگلیسی: This study explored the fabrication, characterization, and microscopic imaging of highly porous electrospun nanofibers based on pure and Fe2O3 nanoparticle modified polyacrylonitrile (PAN) fibers. The desired electrospinning mixture comprising polymer and nanoparticles in dimethyleformamide, was prepared. During electrospinning, the precursor solution was injected using a syringe pump. The empirical parameter influences, including nanoparticles dose, polymer weight percentage, and thickness as applied polymer syringe, were studied on the product morphology and uniformity. The products were analyzed by Fourier transform infrared (FT-IR) spectrophotometer, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results demonstrate that changes in the investigated empirical parameters cause fiber morphology variations and uniformity. Therefore, a strong interaction exists between Fe2O3 and PAN. In general, addition of nanoparticles to PAN solution resulted in a decrease in the average fiber diameter compared to pure PAN.
- انتشار مقاله: 22-12-1395
- نویسندگان: Mohammad Amin Pordel,Afshin Maleki,Mehrdad Khamforosh,Hiua Daraei,Reza Rezaee,Saeed Dehestani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: children,Escherichia coli,Cell Line,Adherence Pattern
- چکیده:
- چکیده انگلیسی: In the present study, carbon species including organic carbon (OC), elemental carbon (EC), and water-soluble organic carbon (WSOC) concentration in PM2.5 were assessed at an urban site of Tehran, Iran during March to June 2014. The PM2.5 samples were collected using an frmOMNITM Ambient Air Sampler. Thermal gravimetric analysis (TGA) was used to analyze OC and EC. The results showed that PM2.5 concentrations varied from 14.32 to 74.45 μg/m3 with an average value of 41.39 μg/m3. The results also showed that carbon species varied from 5.52 to 23.21 (15.35 ± 6.05) μg/m3 for OC and 1.03 to 4.16 (2.25 ± 0.65) μg/m3 for EC. As the findings indicated, the mean PM2.5 level in the sampling area was higher than the annual average determined by the United States Environmental Protection Agency (EPA) as the ambient air quality standard. On average, carbon species (OC, EC, and WSOC) account for almost 60% of PM2.5 mass in the atmospheric outflow from a downwind site. OC and EC concentrations in atmospheric PM2.5 collected at the sampling site were lower than the values reported for other urban areas with high or medium vehicular traffic and/or industrial sources. Moreover, the results obtained in this research can provide a valuable data base for health risk evaluation of the local residents and prioritization of control actions.
- انتشار مقاله: 02-11-1394
- نویسندگان: Zohreh Khodaei,Enayatollah Kalantar,Mahbobeh Mehrabani,Parisa Darabi,Afshin Maleki
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Liver,Body weight,Carp,Metals,Gills
- چکیده:
- چکیده انگلیسی: The aim of this research was to investigate concentrations of cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), and zinc (Zn) in the muscle, gill, and liver of common carp (Cyprinus carpio), tuwini (Capoeta trutta), and Grass carp (Ctenopharyngodon idella) from Sirvan River, Kermanshah Province, Iran, during November to December 2014. This investigation was conducted in order to determine the potential health risk of the intake of these metals through the consumption of the edible parts of fish and also to assess the safe dietary intake levels of these metals. The results of the present study indicated that the highest and lowest accumulated metal concentrations were related to Zn and Cd, respectively. Moreover, the metal concentrations in the gill and liver were higher than in the muscles of the three fish species. The target hazard quotients (THQs) for an adult with mean body weight of 71.5 kg were below 1 based on Cd, Pb, Cr, Cu, and Zn levels. In conclusion, the obtained results indicated that the levels of metals in the edible muscle of fish species in this study were below the level of concern for human consumption.
- انتشار مقاله: 20-12-1394
- نویسندگان: Borhan Mansouri,Afshin Maleki,Behrouz Davari,Jamal Karimi,Vahid Momeneh
- مشاهده