Wastewater from various industries is one of the main sources of environmental pollution, which has detrimental effects on the environment and the lives of living organisms. In recent years, adsorption methods using adsorbents to remove contaminants from water resources have been abundant. Solfounate and Pentaaza Tetra Ethylene supported Polyacrylamide (PAM-SO3-N5) as a novel adsorbent can be effective for removal of chemical pollutants of the aquatic solution. The purpose of this research is removal of Kalmagate using PAM-SO3-N5 as an adsorbent from polluted water in vitro. The effects of variables such as pH, contact time, initial concentration and adsorbent amount were observed to reach best adsorption conditions. Isotherms of Langmuir, Freundlich and Temkin have been fitted with the data of experiment. In addition, kinetics of pseudo- first order, pseudo- second order, intra-particle diffusion and Elovich were also fitted with the experiment data. Also, the results indicated that the best conditions for removal of Kalmagate dye were: pH= 2, removing time= 60 minutes, adsorbent dosage= 0.014 g and initial concentration of dye= 360 mg L-1. For PAM-SO3-N5, Freundlich isotherms showed a good agreement with the experimental data. Using this model to maximize absorption capacity of 1732.5 (mg g-1) for PAM-SO3-N5. Absorption rates showed a quick responses which was less than one hours. Based on these results, the adsorption kinetics of pseudo- second- order was more consistent with the experimental data (R2=0.97). The results show that PAM-SO3-N5 absorbent is effective in removing Kalmagate contaminants from the aqueous solutions due to its high

Introduction: Volatile organic compounds such as xylene are one of the main air pollutants. Adsorption method are of the most common methods used in the control of volatile organic compounds. The aim of this study was to investigate the xylene removal from air through nano activated carbon adsorbent in comparison with NIOSH approved carbon adsorbent. In this study it is tried to follow-up the efficacy of motor oil quality on engines sound level.Material and Method: Xylene adsorption tests on nano activated carbon and activated carbon in staticmode (batch) were done in glass vials with volume of 10 ml. Gas chromatography with FID detector was used for analysis. Various variables including contact time, amount of adsorbent, concentration of xylene, and temperature were studied.Results: Absorption capacity of xylene at ambient temperature (25oC) in static mode and duration of 10minutes for activated carbon and nano activated carbon was obtained 349.8 and 435 mg/g, respectively.Results of Scanning Electron Microscope (SEM) images of nano activated carbon showed particle size pfless than 100 nm. Furthermore, Transmission Electron Microscope (TEM) pictures showed particle size of30 nm. XRD images also showed cube structure of nano activated carbon adsorbent.Conclusion: The results showed that adsorption capacity at constant humidity increased by raising intemperature and contact time. What is more, nano activated carbon absorbent showed greater absorptioncapacity for xylene removal compared to activated carbon absorbent.

In the present work, we have investigated the sorption efficiency of the treated activated carbon from walnut shell (ACW) towards Direct Red 81 (DR81) and Direct Blue 71 (DB71) for the removal from aqueous solution. The sorption study of ACW at the solid-liquid interface was investigated using kinetic, sorption isotherms, pH effect and amount of adsorbent. Experimental data were analyzed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) isotherms. Langmuir isotherm model (R2=0.9664 and R2=0.9484) fitted the equilibrium data the best other isotherms for DR81 and DB71. According to the results maximum adsorption occurred in acidic pH.The results showed that the sorption processes of DR81 and DB71 on ACW are in good agreement with pseudosecond order kinetic. Maximum amount of adsorbent for adsorption of mentioned dyes was 1 gr.

In this work, feasibility of using a non polar adsorbent known as exfoliated graphite (EG) for the separation of polar/non-polar mixture of MTBE/MEOH has been studied. In the case of removal of methanol from MTBE, four main effecting parameters were recognized to study their effect on the adsorption capability of EG. Two parameters of high temperature of thermal treatment and nitric acid/sulfuric acid ratio were related to the synthesis process of adsorbent, whereas MTBE/MEOH ratio in the solution and adsorbent to the solution ratio were other factors related to adsorption stage. To decrease the number of required experiments and determining the contribution of each factor, the Taguchi method was used for design of the experiments. By application of L16 orthogonal array, optimum condition for eliminating MTBE was predicted. According to the obtained results, EG was able to eliminate MTBE from MEOH effectively and at optimum condition, the removal percentage of MTBE was 80.

in this paper, the sorption activity of Salvadora Persica fine particles provided from internal natural resources in Iran with respect to Crystal Violet, Basic Violet-16 and Basic Blue-41 dyes is investigated. Salvadora Persica particles were modified and prepared via particle size reduction and they were characterized by CHNS, XRD, SEM and FT-IR analysis. In the batch system, the influence of pH, adsorbent dosages and dye initial concentration was investigated. The results of isotherm and kinetics studies show that the Langmuir isotherm and pseudo-second order kinetic have better correlation with the experimental data. Calculations of thermodynamic parameters show negative Gibbs free energy (Δ G) values or spontaneous reaction, the enthalpy (Δ H) changes shows the exothermic process and values of entropy (Δ S) indicate low randomness at the solid/solution interface during the uptake of dyes. So, these locally available cheap adsorbents for the removal of basic dyes from the aqueous solution have high efficiency and can also be utilized for other water pollutants such as toxic elements. Prog. Color Colorants Coat. 10 (2017), 115-128© Institute for Color Science and Technology.

Adsorbent clays have an excellent capacity of binding mycotoxins. This work assesses the potential of natural zeolite and bentonite for Aflatoxin M1 (AFM1) removal from milk and water. Artificially contaminated milk and water samples (with 50 and 500 ng/L AFM1) were contacted with 5 gr/L of sorbents, including zeolite powder, zeolite beads and bentonite powder. Amounts of residual AFM1, and also protein, fat and lactose content were determined in treated milks. Results showed that the adsorption of AFM1 on natural zeolite and bentonite varied from 63 to 100% based on the type of clays and AFM1 concentration. For zeolite powder, the adsorption treatment reduced the content of total protein. Adsorbent clays reduce the AFM1 content of milk by surface removal of them. These adsorbents do not destroy or inactivate the toxin and do not produce toxic residual. The extent of toxin removal depends on clay contact surface and by using proper clays; it is possible to reduce the AFM1 content of milk below the allowed level.

Conventional methods are useful for destruction of NOx and CO air pollutants but these technologies are not able to destroy solvents such as acetone, alcohol, halogenated compounds, sulfuric compounds and surfactants. These pollutions cause some problems for human, animals, plants and also for semiconductors that are used in electronic devices. Photocatalytic reactions have been found to be able to overcome the problem. In this research, a catalyst was prepared by sol-gel technique and evaluated by the amount of co conversion. Some adsorbents were added to the catalyst to improve its conversion efficiency. The results show that, for % 80 conversion, the space time of TiO2 -Al2O3 is 4*106 g.s/mol while of TiO2 catalyst is 15*106 g.s/mol. As a result, it can be said that Al2O3 improves conversion efficiency.