ABSTRACTIn this work, the micro powder was the product of cedar leaf (MPCL) is used as a low-cost adsorbent for the removal of Pb2+ ions from aqueous solutions. Bath experiments were used to determine the best adsorption conditions The adsorption percentage of Pb2+ ions MPCL samples at different initial pH, contact time (tc), adsorbent dosage and temperature (T) were investigated. Effective removal of metal ions was demonstrated at pH values of 5. Metal adsorption onto MPCL was evaluated by Langmuir and Freundlich isotherms. Results indicate that the Langmuir isotherm model is the most suitable one for the adsorption process using MPCL (R2=0.9987), thus indicating the applicability of monolayer coverage of Pb(II) ion on MPCL surface. The relationship between thermodynamic parameters was used to predict the absorption process. According to Thermodynamic analysis, the process exothermic and natural (ΔHo= -21.65 kJmol-1 and ΔSo = - 56.4 kJmol-1 K-1).Keywords: Pb2+; adsorption; micro powder; cedar leaf; Thermodynamic; MPCL پرونده مقاله

Corn cob as a low cost adsorbent was used in the present work for the removal of toxic heavy metal Co2+ from aqueous solutions. Bath experiments were used to determine the best adsorption conditions. The equilibrium adsorption level was determined as a function of solution pH, temperature (T), contact time (tc), initial adsorbate concentration, and adsorbent dosage. Effective removal of metal ions was demonstrated at pH values of 8. Metal adsorption onto corn cob was evaluated by Langmuir and Freundlich isotherms. Results indicate that the Langmuir isotherm model is the most suitable one for the adsorption process using corn cob (R2=0.9503), thus, indicating the applicability of monolayer coverage of Co+2 ion on corn cob surface. The relationship between thermodynamic parameters was used to predict the absorption process. According to Thermodynamic analysis, the process was found to be endothermic and natural: (ΔHo= -18.7 J mol-1 and ΔSo = -47.6 J mol-1 K-1). Keywords: Cobalt (II); Adsorption; Thermodynamic; Corn cob پرونده مقاله

Synthetic dyes are using extensively in various industries such as textile, leather tanning, plastic, pulp and paper. Since this dyes are mainly toxic and even carcinogenic, discharging dye containing wastewater into the environment generates serious environmental and health consequences. Therefore, in this research investigated and evaluated the removal effect of Reactive Red 120 (RR 120) from aqueous solutions using Albizia lebbec fruit (pod) partical as a low cost adsorbent to decline mentiined undesirable consequences .In past batch adsorption investigations carried out to study various parameters including contact time, initial concentration of Reactive Red 120, pH, and adsorbent dosage. The concentration of dye was measured using a UV-vis Spectrophotometer at the wavelength of 520 nm. For analyzing data equilibrium, used from Freundlich and Langmuir isotherm models. It was found that Langmuir isotherm (R2=0.9992 and qm =1.45 mg/g) is well fitted with our data. According to thermodynamic analyzing, the process exothermic and inherent spantaneous that's it: ΔHo=9.75 J.mol-1and ΔSo=38.13 J.mol-1K-1. پرونده مقاله

toxicity, cancinogenic activity, and mutagenicity. The purpose of this study was evaluation of the removal of Reactive Red 120 (RR-120) dye from aqueous solution by date Palm (Phoenix dactylifera) seed particles. Batch adsorption studies carried out to study various parameters included contact time, initial concentration of Reactive Red 120, pH, and adsorbent dosage. The concentration of dye was measured using a UV-vis Spectrophotometer at the wavelength of 520 nm. Freundlich and Langmuir isotherms were used to analyze the isotherm. it was found that Langmuir isotherm (R2=0.9991 and qm =1.68 mg.g-1) is well fitted with our data. According to Thermodynamic analysis, the process exothermic and natural (ΔHo= -0.006 J.mol-1 and ΔSo= -13.9 J.mol-1K-1). To evaluate the mechanism of adsorption, pseudofirst order and second order kinetic models were used. The adsorption mechanism was found fit the second order (K2= 0.4 mg.g-1.min-1 and R2= 0.999). پرونده مقاله

This research focuses on gamma alumina nanoparticles using for the adsorption of the cationic methylene blue dye (MB) from aqueous solutions. Batch adsorption studies carried out to study various parameters included pH, gamma alumina nanoparticles dosage, temperature and contact time. The concentration of methylene blue dye was measured using a UV-vis Spectrophotometer at the wavelength of 620 nm. The optimum adsorption conditions were found to be pH=8, adsorbent dose=0.05 g, temperature=298 K and contact time=40 min. The experimental results of this work were compared with Langmuir, Friendlich and Tamkin's isotherm models. The obtained results from isotherm models showed that the surface adsorption of these dyes on the better adsorbent follows the Langmuir isotherm model. Analysis of thermodynamic data showed that the adsorption process of the studied dyes on the surface adsorbent is spontaneous (The negativ value of ΔG0) and exothermic (The negativ value of ΔH0). پرونده مقاله

Highly selective molecularly imprinted polymers (MIPs) for solid-phase extraction of acyclovir have been designed and prepared. In order to study the intermolecular interactions in the pre-polymerization mixture and to find a suitable functional monomer in MIP preparation, a computational approach was developed. It was based on the comparison of the binding energy of the complexes between the template and functional monomers. The effect of the polymerization solvent was included using the polarizable continuum model. According to the theoretical calculation results, the MIP with acyclovir as template was prepared by precipitation polymerization method using acrylamide (AAM) as functional monomer and ethylene glycol dimethacrylate (EGDMA), as cross-linker in acetone. Having confirmed the results of computational method, three MIPs were synthesized with different functional monomers, i.e. acrylamide (AAM), allylamine (AA) and acrylonitrile (ACN), and then evaluated using LangmuirFreundlich (LF) isotherm. The results of this study have indicated the possibility of using computer aided design for rational selection of functional monomers and solvents capable of removal of acyclovir from contaminated fluids. پرونده مقاله

These days, the removal of various dyes from industrial wastewater has become an important concern. Synthetic dyes used in industries such as textiles are complex, toxic and mutant organic materials. Congored is also an acidic dye that is considered a high- risk source of contamination and threatens the lives of humans and other living organisms. Different methods, such as electrochemical, physical and biological processes, are used to remove organic pigment from aqueous samples. Adsorption is one of the most effective modern methods of industrial wastewater treatment, which is a relatively simple and inexpensive process that produces non- toxic and low- risk products. This research focuses gamma alumina nanoparticles was used for the adsorption of the cationic dye congored from aqueous solutions. Batch adsorption studies carried out to study various parameters included pH, gamma alumina nanoparticles dosage, temperature and contact time. The concentration of dye congored was measured using a UV-vis Spectrophotometer at the wavelength of 498 nm. The optimum adsorption conditions were found to be pH=6, adsorbent dose=0.04 g, temperature=298 K and contact time=40 min. The experimental results of this work were compared with Langmuir, Friendlich and Tamkin's isotherm models. The results obtained from isotherm models showed that the surface adsorption of these dye on the adsorbent used better follows the Langmuir isotherm model. Analysis of thermodynamic data showed that the adsorption process of the studied dye on the adsorbent surface is spontaneous and exothermic. پرونده مقاله