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Open Access Article
1 - Facile Synthesis and Investigation of Flower like p-NiO/n-ZnO as Efficient Photocatalyst for Degradation of Erythromycin under Sunlight
Sajad Khamani Mohammad Hossein Ghorbani Leila Torkian Reza Fazaeli Zahra KhodadadiConventional wastewater treatment is not able to effectively removal drugs such as antibiotics, so it is important to remove the remaining antibiotics from the environment. In this research, Zinc oxide (ZnO), nickel oxide (NiO) and p-NiO/n-ZnO heterostructure were synth MoreConventional wastewater treatment is not able to effectively removal drugs such as antibiotics, so it is important to remove the remaining antibiotics from the environment. In this research, Zinc oxide (ZnO), nickel oxide (NiO) and p-NiO/n-ZnO heterostructure were synthesized. Then, prepared samples were characterized by several techniques. The photocatalytic degradation of erythromycin from aqueous solutions was studied by photocatalysts synthesized under sunlight. Design of Experimental (DOE) was used to evaluate the effective parameters in the degradation process of erythromycin. The effects of pH, time (min), photocatalytic mass (g) and erythromycin concentration (mg/L) were studied. Using Design Expert 7 software, the highest degradation efficiency of erythromycin was found 99.54%, under optimum conditions at pH 3.07, time 101.14 (min), photocatalyst mass 0.13 (g) and erythromycin concentration 41.04 (mg/L). Isothermal studies have shown that the Fritz-Schlander isotherm with the least error with the experimental data of p-NiO/n-ZnO (5%) photocatalytic degradation are the best fit. Manuscript profile -
Open Access Article
2 - Investigation of enamel surface hardness using remineralization of white spot lesions with CPP-ACP, fluoride, and CPP-ACPF
Farzaneh Shirani Shirin Rostami Parastoo AfghariAbstract: The enamel surface hardness determination plays a key role in surface abrasion a resin composite bond strength. The aim of this study was to investigate the enamel surface hardness after remineralization of white spot lesions using casein phosphopeptide amorph MoreAbstract: The enamel surface hardness determination plays a key role in surface abrasion a resin composite bond strength. The aim of this study was to investigate the enamel surface hardness after remineralization of white spot lesions using casein phosphopeptide amorphous calcium phosphate (CPP-ACP), fluoride and casein phosphopeptide amorphous calcium phosphate fluoride (CPP-ACPF). Materials and Methods: A 36 bovine anterior teeth were chosen and after decoronization, the teeth were mounted in acrylic resin and their baseline surface hardness was measured. Samples were then demineralized and their surface hardness was measured. The teeth were then divided into three groups and subjected to surface treatment with CPP-ACP, CPP-ACPF and fluoride mouthwash. The surface hardness was measured and the data were analyzed using SPSS software. Results: Paired t-test showed that surface hardness significantly changed after demineralization (P<0.001) and after treatment with CPP-ACPF (P<0.001) and fluoride (P=0.005), however: the change was not significant after treatment with CPP-ACP (P=0.155). Conclusions: The obtained results indicated that treatment with fluoride and CPP-ACPF may increase the surface hardness of demineralized enamel. Manuscript profile -
Open Access Article
3 - Synthesis and evaluation of antibacterial properties of green copper oxide nanoparticles from Hypericum perforatum plant extract and Marrubium Vulgare
Ashkan Farazin Shirin KavezadehIn the present study, copper oxide nanoparticles were synthesized using Hypericum perforatum plant extract from the Malpican family and Marrubium Vulgare plant from the mint family. Since it is believed that the antioxidants in the plant reduce the reduction of metal io MoreIn the present study, copper oxide nanoparticles were synthesized using Hypericum perforatum plant extract from the Malpican family and Marrubium Vulgare plant from the mint family. Since it is believed that the antioxidants in the plant reduce the reduction of metal ions to nanoparticles as reducing agents, these two plants were tested for their antioxidant properties by the free radical scavenging method, and the IC50 quantity was measured. Hypericum perforatum plant with IC50 equivalent to 0.413 had more antioxidant content than Marrubium Vulgare plant with IC50 equivalent to 1.562, so it was superior in the process of green synthesis. The properties of the synthesized nanoparticles were analyzed using X-ray diffraction (XRD), Scanning electron microscope (SEM), and Ultraviolet-visible (UV-Visible). The presence of a metal-oxygen bond was confirmed by Fourier-transform infrared spectroscopy (FTIR). X-ray energy diffraction spectra showed the purity of the synthesized nanoparticles. The synthesized nanoparticles were observed with spherical morphology and size distribution of 30 to 40 nm and with uniform size distribution. The results of the XRD spectrum showed that pH adjustment did not affect the synthesis of copper oxide nanoparticles. The nanoparticles synthesized against the two bacteria used in this present study did not show significant antibacterial properties compared to industrial antibiotics. Manuscript profile -
Open Access Article
4 - Preparation and Characterization of Silica Coated Magnetic Cu Based MOF as a Nanocarrier for Gradual Release of the Capecitabine Anticancer Drug
Azar Asgari Pari Susan Samadi Mohammad Reza__Allahgholi__Ghasri Mohammad Reza__Allahgholi__Ghasri Maryam Torbati Mohammad YousefiThis study developed a novel silica-coated magnetic nanoparticle (Fe3O4@SiO2@Cu BTC) based on a metal-organic framework (MOF) for targeted anticancer medication delivery. Using a co-precipitation method, the Fe3O4@SiO2 core was coated with Cu(OH)2 shell, which was then MoreThis study developed a novel silica-coated magnetic nanoparticle (Fe3O4@SiO2@Cu BTC) based on a metal-organic framework (MOF) for targeted anticancer medication delivery. Using a co-precipitation method, the Fe3O4@SiO2 core was coated with Cu(OH)2 shell, which was then converted to CuBTC in a hydroethanolic mixture. Finally, a post-synthetic approach was used to manufacture a 3-(mercaptopropyl) trimethoxysilane functionalized Fe3O4@SiO2@Cu BTC nanocomposite. The resulting material is characterized using SEM-EDX, TEM, VSM, XRD, TGA, BET, UV–Vis, and FTIR techniques. TEM and SEM micrographs confirmed the core-shell structure. The resulting nanocomposite has high thermal stability, according to TGA findings. Because of their great biocompatibility and drug loading capability, coated Fe3O4@SiO2@Cu BTC nanoparticles might be perfect for drug delivery. Capecitabine (CAP), an anticancer medication, was successfully dispersed through MOF pores. The acquired data revealed that 91 percent of the CAP was adsorbed on the constructed framework, and that the release of capecitabine in PBS buffer solution (pH 5.7) at 37 °C took up to 60 hours to complete. The findings show that nano-sized MOFs-based magnetic NPs with high drug loading and acceptable biocompatibility are viable options for targeted drug delivery. Manuscript profile -
Open Access Article
5 - The effect of acid/cellulose ratio on the quality of Cellulose Nanocrystal (CNC) suspension
Nasrin Shahmiri Nahid Hassanzadeh Nemati Ahmad Ramazani Saadatabadi Massoud SeifiCellulose nanocrystals are promising materials for application in biomedicine, pharmaceutical and food industry. There are various methods for CNC synthesis, but acid hydrolysis is the most common one. The optimization of acid hydrolysis process is still in progress. In MoreCellulose nanocrystals are promising materials for application in biomedicine, pharmaceutical and food industry. There are various methods for CNC synthesis, but acid hydrolysis is the most common one. The optimization of acid hydrolysis process is still in progress. In the present study, different CNC suspensions were prepared to find out the more efficient acid ratio for CNC production. Whatman #1 filter paper was hydrolyzed via 64 wt% sulfuric acid at acid-to-paper ratio of 10:1 mL/g, 20:1 mL/g, 30:1 mL/g, and 40:1 mL/g. The synthesized CNCs were characterized by DLS, ELS and AFM. The suspensions with acid/cellulose ratio of 20:1 mL/g & 30:1 mL/g resulted in CNCs with more negative surface charge and uniform size. They also represented chiral nematic phase and regular self-organization after layer by layer deposition. It was found that the higher acid-to-paper ratio does not necessarily produce the high quality CNCs. Since the suspension that was prepared at acid/cellulose ratio of 40:1 mL/g had lower negative charge. The size and surface charge of CNCs are highly dependent to acid hydrolysis parameters and ultimately affect their behavior in nano-composites. In spite of many published papers around CNC synthesis by acid hydrolysis, there are still some details that must be addressed and investigated more to prepare the most efficient and applicable CNCs. Manuscript profile -
Open Access Article
6 - The application of ZnO nanoparticles as a photocatalyst for wastewater treatment: A review
Mahdi Sanavi Fard Aref ShokriEver-increasing environmental pollutions and water scarcity are highly challenging issues that pose formidable obstacles to human beings on all fronts. Hetero-photocatalytic methods which utilized semiconductors as photocatalysts are highly promising and green technolog MoreEver-increasing environmental pollutions and water scarcity are highly challenging issues that pose formidable obstacles to human beings on all fronts. Hetero-photocatalytic methods which utilized semiconductors as photocatalysts are highly promising and green technologies for the degradation of recalcitrant organic pollutants which cannot be completely removed by conventional treatment processes. In the view of the current scenario, zinc oxide nanostructures have been demonstrated to be predominant photocatalyst candidates for photodegradation because of their cost-effectiveness, non-toxicity, strong oxidation capability, flexibility in synthesizing, earth-abundance nature, easy crystallization, and high performance in the absorption over an extensive fraction of solar spectrum in comparison with titanium dioxide. Nevertheless, bare zinc oxide possesses several intrinsic limitations, like high recombination rate of the photogenerated charge carriers, limited solar light application, photo corrosion, broad bandgap and limited visible light absorption. Moreover, photocatalysts separation from remediated solutions restricts their large-scale applications. In this review paper, the authors briefly discussed basic principles of the zinc oxide photocatalytic process besides various modifications such as coupling with low bandgap semiconductors like metal and non-metal doping, synthesizing with graphene oxide, or reduced graphene oxide and their integration in magnetic materials to successfully addressing aforesaid disconcerting challenges. Moreover, hybridized photocatalytic and membrane systems are explored. Finally, challenges and future research directions are proposed for giving profound and well-defined insights toward reaching fully exploited zinc oxide-based nanoparticles in the field of water and wastewater treatments. Manuscript profile -
Open Access Article
7 - Computational investigation of adsorption of Lewisite Warfare Agents on the B12N12 and M+@B12N12 (M+ = Li+, Na+, K+) nanoclusters
Reza Ghiasi R Emami M VasfiThis research surveyed the adsorption of Lewisite warfare agent on the B12N12 and M+@B12N12 (M+ = Li+, Na+, K+) nanoclusters with at the LC-wPBE/ 6-311+G(d,p) level of theory. Adsorption energy values of Lewisite on the nanoclusters were computed, and impact of metal ca MoreThis research surveyed the adsorption of Lewisite warfare agent on the B12N12 and M+@B12N12 (M+ = Li+, Na+, K+) nanoclusters with at the LC-wPBE/ 6-311+G(d,p) level of theory. Adsorption energy values of Lewisite on the nanoclusters were computed, and impact of metal cation on the adsorption was uncovered. Thermodynamics parameters of these responses were computed. Molecular orbital analyses of the B12N12 … Lewisite and M+@B12N12 …. Lewisite systems were explained.Computational examination of adsorption of Lewisite warfare agent on the B12N12 and M+@B12N12 (M+ = Li+, Na+, K+) nano-clusters with at the LC-wPBE/ 6-311+G(d,p) level of theory shown the doped nano-clusters had more propensity to adsorb Lewisite than B12N12 cluster. Appropriation strength decreased with increasing of effective atomic number of metal cation. Lewisite fragment had importance commitment within the frontier orbitals of examined systems. Responses of M+@B12N12… Lewisite complexes arrangement were the more spontaneous and exothermic than B12N12… Lewisite complex. This computational study regarded the interaction between B12N12 and M+@B12N12 (M+ = Li+, Na+, K+) nanoclusters with Lewisite warfare agent at LC-wPBE/ 6-311+G(d,p) level of theory. The structural parameters, frontier orbital energies and thermodynamics parameters were computed. The impact of metal cation on the adsorption was outlined. Manuscript profile -
Open Access Article
8 - Evaluation of Antibacterial Effect of Zinc Oxide Nanoparticles Synthesized by Wet-chemically Method on Multidrug-resistant Uropathogenic Bacteria
Maryam Bagheri Mohammad Gholipour Monir Doudi Ali Mohammad Ahadi Gholam Reza AmiriZinc oxide (ZnO) nanoparticles have been attracted for their antibacterial effects along with their safety, suitable physicochemical properties, and cost effectivity. The aim of this study was to synthesize ZnO nanoparticles and investigate their antibacterial effects o MoreZinc oxide (ZnO) nanoparticles have been attracted for their antibacterial effects along with their safety, suitable physicochemical properties, and cost effectivity. The aim of this study was to synthesize ZnO nanoparticles and investigate their antibacterial effects on multidrug resistant (MDR) uropathogenic bacteria. ZnO nanoparticles were constructed by wet chemical method with inhibitor. Structural and optical evaluation of zinc oxide nanoparticles was performed by Ultraviolet absorption spectroscopy, X-ray diffraction (XRD), and Tunneling microscopy. Uropathogenic bacteria were isolated from the patient’s pediatric urine and identified through biochemical testing. Antibiotic resistance pattern of the isolates was determined by disk diffusion method and the antibacterial activity of ZnO nanoparticles was detected by pour plate method at the concentrations of 0.0125, 0.025, 0.05, 0.1, 0.2, 0.4, and 0.8 g/l. The produced ZnO nanoparticles had a hexagonal shape with the crystal size of 15 nm and an optical size of 3 nm. The minimum effective concentration of these nanoparticles that inhibited the bacterial growth was 0.05 g/l. E.coli was generally found to be the most frequent cause of UTI in children in Isfahan, in the center of iran, with the mean prevalence of 64%. Most cases of resistance were related to Ampicillin, Amoxicillin, Tetracycline and the highest sensitivity was related to Chloramphenicol, Gentamicin, Trimethoprim/Sulfamethoxazol. The results of the present study, in accordance to the previously approved safe characteristics of ZnO nanoparticles, concentration of 0.05 g/l is proposed to be evaluated for in vivo usage for treatment of urinary tract infections. Manuscript profile
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