فهرست مطالب مجید اسم حسینی

The aim of the present study is to investigate the removal of nickel ions from aqueous solutions using natural zeolite. Batch experimental studies were conducted to evaluate by changing relevant parameters such as initial pH of solution, dosage of adsorbent, contact time, initial nickel ion concentration and temperature. The experimental isotherm data are analyzed using Langmuir and Freundlich equations. The Langmuir model fits the equilibrium data better than the Freundlich model. According to the Langmuir equation, the maximum uptake for nickel ions is 18.09 (mg/g). Pseudo-first-order and pseudo-second-order models are used to represent the kinetics of the process. The results indicate that the pseudo-second-order model is the one that best describes the kinetics of the adsorption of metal ions. The calculated thermodynamic parameters (ΔG°, ΔH°, and ΔS°) show that the adsorption process is feasible, spontaneous and endothermic at 20-50°C. Based on the experimental results, it can be concluded that natural zeolite has the potential of application as an efficient adsorbent for the removal of heavy metals from aqueous solutions.

In this project, extraction of Magnesium Chloride has been studied and a semi-industrial method, which uses calcimined dolomite, has been suggested. In order to determine the effect of different factors such as time, pHand etc. on the product yield artificial solution containing distinct of Mg2+ and SO4 2- were prepared and then the best condition of extraction of Magnesium salt was studied. The real samples were prepared from Urmia Lake, and similar studies were performed on them. Measurement of Calcium and Magnesium ions existing in extracted samples has been done Using titration method.

Heavy metals and ammonium ion are toxic priority pollutants that commonly interfere with the beneficial use of wastewater for domestic and industrial application. Therefore removal of inorganic contaminants mentioned from wastewater would have vital importance for protection of public health. The most widely used method of removing inorganic compounds from wastewater is ion exchange process. The purpose of this study was to investigate the possibility of the utilization of natural Western Azarbaijan Zeolite for removal of heavy metal ions (Co2+, Pb2+, Zn2+, Cd2+) and Ammonium ion (NH4+) from waste water by ion exchange. Both batch and continuous experiments were carried out. The effects of relevant parameters, such as initial ammonium concentration, dosage of absorbent, stirring time, particle size, pH and thermal analysis on removal efficiency completely were investigated. The cation exchange capacity of natural Western Azarbaijan zeolite was found to be 1.79 meq g -1. It can be concluded that the natural Western Azarbaijan zeolite has the excellent potential for removing ammonium ion and heavy metal from aqueous solutions and is suggested for wastewater treatment purposes.

Areas where the soil and groundwater containing large quantities of sulfate and where structures are built in marine environments, must be designed of a kind of concrete that have sufficient resistance about sulfate attacks. Sulfate salts in the solid state are unable to harm the concrete, but when they are in the solution state, can reaction with materials created from the operation of the Cement Hydration i.e. calcium hydroxide, calcium aluminate and silicate hydrate, that these reactions lead to the failure and collapse of concrete. In this study, extraction rate and optimal conditions for utilization of sodium sulfate in Urmia lake water using minimal energy and climate zone and using non-evaporating method has been investigated. Due to the high amounts of sodium sulfate deposits in Iran and also the lack of chemical reaction in the process of processing, consequently easy equipments, tips and technical operating conditions studied in this case is very important. In addition, economic investment was performed on the extraction of sodium sulfate and a plan to create semi-industrial and industrial units for the extraction of sodium sulfate with the lowest energy and money spent has been proposed. Due to abundant amounts of sulfate ion in Urmia lake water, concrete structures of causeway bridge on Shahid Kalantari Highway between Urmia and Tabriz are not safe from corrosion damage resulting from sulfate. In this scheme corrosion causes by sulfate ion and Results of the study was obtained.

In today world water and water resources are considered as one of the most important properties. The main challenges for societies are to prepare food, water and energy. Among these it is somehow easier to provide food, because there are many ways to prepare it, also energy because of finding new resources, and it is only water that can make troubles for societies if there is no resource left. So planning for economizing the use of it and protection of available resources are of primary priorities. On the other hand occurrence of several droughts and increasing population growth, make the need for healthful drinking water. The water purification, better use of it in industry, water need in agricultural, the technological advances to use industrial, such as analytical methods in water purification and reducing the costs is inevitable. Some examples are chromatographic columns, resins, ion exchangers for softening, and reducing the hardness of water, and other processes such as chlorination, fluoridation, filtering and precipitation via advanced methods by using effective disinfection, advanced industrial methods and use of microprocessors to control the purification. In this connection purification processes in advanced countries are investigated such as United States. The advantages and disadvantages of mentioned methods are reported from different aspects. The result of such studies can provide us to use the new experiences in the world to use water Treatment technologies in Iran in order to prepare healthful drinking water and at the same time to reduce waste of time and expenses.

In this project, extraction of Magnesium Chloride has been studied and a semi-industrial method, which uses calcimined dolomite, has been suggested. In order to determine the effect of different factors such as time, pH and etc. on the product yield artificial solution containing distinct of Mg2+ and So42- were prepared and then the best condition of extraction of Magnesium salt was studied. The real samples were prepared from Urmia Lake, and similar studies were performed on them. Measurement of Calcium and Magnesium ions existing in extracted samples has been done by employment of titration method

In this study the amount of sodium sulfate extraction from Urmia Lake and the optimized conditions were investigated using local climate and minimum energy via non evaporative methods. Because of ampleness of sodium sulfate supplies in Iran and also chemical inertness of this compound in production processes and as are salt the simplicity of equipment needed, studying technical points and working conditions are very important. To determine the effect of different factors such as time, temperature, etc. On the yield of products and extra purity of sodium sulfate, samples of lake water taken using vessels with the same size and conditions, and the methods of sodium sulfate extraction in environment temperature without using evaporative methods were investigated. Other elements such as Chlorine, Magnesium, Calcium, Sodium, and Potassium were also analyzed in the extracted salt. More over, economic investigations on sodium sulfate extraction were done and some plans for semi industrial and industrial projects were suggested to extract sodium sulfate with the minimum energy and cost.

In this study the amount of sodium sulfate extraction from Urmia Lake and the optimized conditions were investigated using local climate and minimum energy via non evaporative methods. Because of ampleness of sodium sulfate supplies in Iran and also chemical inertness of this compound in production processes and as are salt the simplicity of equipment needed, studying technical points and working conditions are very important. To determine the effect of different factors such as time, temperature, etc. On the yield of products and extra purity of sodium sulfate, samples of lake water taken using vessels with the same size and conditions, and the methods of sodium sulfate extraction in environment temperature without using evaporative methods were investigated. Other elements such as Chlorine, Magnesium, Calcium, Sodium, and Potassium were also analyzed in the extracted salt. More over, economic investigations on sodium sulfate extraction were done and some plans for semi industrial and industrial projects were suggested to extract sodium sulfate with the minimum energy and cost.