In this study, graphene oxide was synthesized and investigated as an adsorbent for eosin B elimination. The features and structure of graphene oxide were determined by employing scanning electron microscopy, transmission electron microscopy, Raman spectrometry, and X-ray diffractometry. Graphene oxide can remove dyes in water solutions, but it is confronted by separation challenges. Therefore, zinc oxide was used as a coagulant for separation of the dye solution from graphene oxide. Adsorption properties such as contact time, dye concentration, dosage of adsorbent, zinc oxide content, pH effect, and temperature were regularly investigated extensively. Concentrations of dyes in the supernatant suspension were evaluated employing a visible spectrophotometric method at the maximum wavelength (λmax) of 514 nm. The eosin B dye showed maximum sorption capacity of 68.027 mg/g at pH 4 and T=298 K. Isotherm models such as Freundlich and Langmuir isotherms were used to determine the better suitable isotherm model. It was discovered that this dye adsorption capacity on adsorbent particles was monolayer and had a good agreement with the Langmuir isotherm. Pseudo-first-order and pseudo-second-order kinetic models were investigated to determine adsorption kinetics. The pseudo-second-order for sorption of this dye on adsorbents was followed by kinetic data analysis. This research shows that this sorbent and coagulant are efficacious and applicable for the removal of eosin B from wastewaters.
Last. A. H. Ramezani(IAU: Islamic Azad University)H-Index: 6
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In the current study, composites of tungsten trioxide (W03) and silver (Ag) are deposited in a layer-by-layer electrochromic (EC) arrangement onto a fluorine-doped tin oxide coated glass substrate. Tungsten oxide nanoparticles are an n-type semiconductor that can be used as EC cathode material. Nano-sized silver is a metal that can serve as an electron trap center that facilitates charge departure. In this method, the WO3 and Ag nanoparticle powder were deposited by physical vapor deposition ont...
#1Jiang-Bin Wu(CAS: Chinese Academy of Sciences)H-Index: 24
#2Miao-Ling Lin(CAS: Chinese Academy of Sciences)H-Index: 12
Last. Ping-Heng Tan(CAS: Chinese Academy of Sciences)H-Index: 62
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Graphene-based materials exhibit remarkable electronic, optical, and mechanical properties, which has resulted in both high scientific interest and huge potential for a variety of applications. Furthermore, the family of graphene-based materials is growing because of developments in preparation methods. Raman spectroscopy is a versatile tool to identify and characterize the chemical and physical properties of these materials, both at the laboratory and mass-production scale. This technique is so...
The use of low-cost and eco-friendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from wastewater. In this study, not hydrolyzed poly(styrene-alternative-maleic anhydride) (PSMA) polymer have been used as new synthetic adsorbent to removal of acid red-14 dye from aqueous solutions (industrial wastes). Batch sorption studies have been carried out to determine the effect of agitation time, pH, adsorbent dose, and initial concentration o...
#1Jian Wang(NCEPU: North China Electric Power University)H-Index: 23
#2Shujun Yu(NCEPU: North China Electric Power University)H-Index: 42
Last. Xiangke Wang(Qinghai Normal University)H-Index: 124
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The biological toxicity and negative environmental effect of graphene oxide (GO) have attracted wide public concern due to its potential risks. To assess the transport behavior and to reduce the environmental hazardous of GO in natural environment, ZnO and MgO were used as coagulant for GO removal from aqueous solutions. The results indicated that GO coagulation on ZnO and MgO were scarcely affected by ionic strength. At neutral pH, the GO removal capacities could reach 232.8 mg/g on MgO and 210...
Last. Hanieh Fakhri(TMU: Tarbiat Modares University)H-Index: 10
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ZnO/NiO/magnetic graphene oxide (ZNMG) nanocomposite has been successfully synthesized by depositing a ZnO/NiO on magnetic graphene oxide (MGo) sheets. The nanocomposite was characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) and Raman spectroscopy that indicate a good combination between MGo ZnO, NiO. For ZNMG, the band gap energy of 2.8 eV was determined by the diffuse reflectance spectroscopy (DRS) that it could have appropriate potential for photocatlytic acti...
Abstract Proflavine, a nitrogen-containing dye is used for DNA staining and as an efficient marker, however, it is harmful to body cells, and its efficient removal is essential. In this work, graphene oxide (GO) has been used as an adsorbent for the removal of the dye through the process of adsorption. Though GO is now being used as an adsorbent for the removal of industrial dyes, very few experiments have been done on biologically useful dyes. GO is synthesized from graphite powder by the modif...
#1Ali Fakhri(IAU: Islamic Azad University)H-Index: 30
KEYWORDSAniline;Adorption;Graphene oxide;Isotherm;KineticsAbstract The aim of this study is to investigate the possibility of graphene oxide (GO) as an alter-native adsorbent for aniline removal from aqueous solution. Adsorption properties of GO for ani-line removal were regularly investigated, including pH effect, adsorbent dose, temperature, contacttime and initial concentration. The adsorption amount of aniline decreased with increasing pH. Theexperimental data were evaluated by Langmuir, Fre...
In this study, a kind of magnetic graphene oxide/cationic hydrogel nanocomposite (MGO–CH) was synthesized and characterized for acid red 88 (AR88) removal. SEM and HRTEM-EDS show that the magnetic graphene oxide nanoparticles were effectively dispersed on the cationic hydrogel matrix. The adsorption kinetics, isotherms, and effects of pH on AR88 uptake by MGO–CH were evaluated. The results show that MGO–CH achieves positive zeta potential values of 35.6–27.8 mV at pH 3.0–10.5, with a saturation ...
Abstract Rapid adsorption process of hazardous malachite green (MG) dye from the liquid phase onto the developed adsorbent i.e. graphene oxide (GO) and reduced graphene oxide (rGO) surfaces was well studied and elucidated. The batch adsorption experiments were carried out in order to evaluate the optimized values of the influential parameters such as initial pH, contact time, and temperature. The obtained optimized values of pH, contact time and temperature was 3, 100 min and endothermic nature ...
#1Tao Wen(NCEPU: North China Electric Power University)H-Index: 36
#2Qiaohui Fan(CAS: Chinese Academy of Sciences)H-Index: 28
Last. Xiangke Wang(CAS: Chinese Academy of Sciences)H-Index: 124
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The current methods for chromium and natural organic matter decontamination from wastewater present limitations, such as high cost, poor reproducibility, and detrimental environmental effects as well as by secondary waste. Herein, we synthesized a core–shell structure of polyaniline/hydrogen-titanate nanobelt (PANI/H-TNB) composites through chemical oxidation in the presence of phytic acid, which played an important role in the formation and regeneration of PANI. The adsorption performance of PA...
Last. A. Hashemizadeh(PNU: Payame Noor University)H-Index: 1
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In this study, the influence of interfacial roughness of multilayers structures on spin filter tunneling is investigated at low biases as a function of interfacial roughness type. The results show that the roughness causes the reduction of resonant tunneling, maximum achievable tunneling magneto resistance (TMR), and spin-filtering efficiency of tunneling structures. Based on the numerical results, decreasing the electronic devices’ efficiency is straight related to roughening of interfacial. Ad...
Liquid–liquid equilibrium (LLE) data for the (water + valeric acid + methyl ethyl ketone or methyl isobutyl ketone) ternary systems were measured at T = (298.2, 308.2 and 318.2) K and atmospheric p...
The purpose of this paper is to investigate the heat transfer of laminar and turbulent pulsating Al203/water nanofluid flow in a two-dimensional channel. In the laminar flow range, with increasing Reynolds number (Re), the velocity gradient is increased. Also, the Nusselt number (Nu) is increased, which causes increase in the overall heat transfer rate. Additionally, in the change of flow regime from laminar to turbulent, average thermal flux and pulsation range are increased. Also, the effect o...