journal of kerbala university

The readily accessible, highly efficient and cheaply adsorbents of Iraqi Rice Husk (IRH) was applied for separation of rhenium (Re) from aqueous solution. Different operation parameters were studied which were initial Re concentration, absorbance material packing height, pH of aqueous solution, contact time, flow rate and feed temperature. It was found that Re could be adsorbed quantitatively (above 90%) on IRH in the pH range of 1.0-3.0. For other parameters, when flow rate and initial concentration were decreasing the percentage removal was increased, and vice versa with respect to contact time and the height of adsorbent. Best kinetic and isotherm results were achieved by that the pseudo-second-order and Freundlich isotherm equations, respectively. Thus, IRH as the sorbent was successfully applied to the separation of Re from the aqueous solution with satisfactory results.

In this research, the bentonite clay was utilized for the removal of mercury ion from aqueous solutions. Adsorption experiments were conducted under various conditions where the batch method was used to determine the best adsorption ratio and the adsorption capacity for the concentration used of Hg(II) ion between (100-10 mg/L), the results show that the best concentration was (10 mg/L) where the adsorption ratio was 88.7 and the adsorption capacity was 0.444 mg/g. The adsorbent dose was 20 g/L, and the shaking time found that it equal to 140 min and the best pH value between (5-8). The effect of temperature and thermodynamic functions wear also studied, the adsorption capacity was increased with increased the temperature and the reaction was endothermic. The equilibrium isotherm data was analyzed using the Langmuir equation, where found qm and b are equal to 3.367 mg/g and 0.134 respectively. The rate constant k2 for the adsorption of Hg(II) ion is equal to 0.1067 g/mg.min

Polycystic ovary syndrome (PCOS) is a gynaecological disease that has multiple connections with many diseases. It has been estimated that myocardial infarction is more likely in patients with PCOS. The effect of serum calcium and magnesium on the risk of heart diseases is not yet established. In this work, the lipid profile (total cholesterol TC, triglycerides TG, and very low-density lipoprotein VLDL, and high density lipoprotein HDL-C), serum magnesium, and calcium have been estimated in PCOS patients in comparing with control group. Different atherogenic ratios ((TC/HDL-C, LDL-C/HDL-C, TG/HDL-C, and Log (TG/HDL-C)) were calculated to obtain the best indicative ratios for the risk of cardiovascular diseases. The results showed that there is a significant increase (p<0.05) in TC, TG, and VLDL in PCOS patients as compared with control group. While HDL and serum calcium is decreased significantly (p<0.05) in patients group in comparing with control group. No significant change in serum magnesium and Ca/Mg ratio between both groups. There is no correlation (-0.50

Keywords

Polycystic ovary syndrome
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lipid profile
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calcium
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magnesium
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cardiovascular diseases
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متلازمة تكيس المبيض، انماط الدهون، الكالسيوم، المغنسيوم، امراض القلب والشرايين

In this paper a study was carried out to estimate the ability of Bentonite clay as a new adsorbent surface for removal and adsorption of Cadmium ion from aqueous solutions . The effect of contact time was evaluted and found that the removal process of Cadmium Ion by Bentoniite surafce was reached complete equilibrium at 60 min .The maximum removal or adsorption of Cadmium ion by Bentonite adsorbent were found 87.2% at 40 min . The kinetic results were well fitted to lagergren pseudo – second order models . This behavior was discussed depending on the chemical structure of Cadmium ion and Bentonite surface area. The intraparticle difusion model was also used to studied the kinetics and mechanisms of Cadmium Ion removal . Results model plays a significant role in the adsorption mechanism

Background: Methylene blue dye uses as adsorbent to study the ability of different surface activities as adsorbents. The adsorbents can be used in the extraction of certain pollutant substances from solution on solids which is one of the cheapest and easiest separation methods. Furthermore, some of the extracted substances are economically important. In previous work, the ability of English bentonite to extract methylene blue dye from aqueous solution was carried out. In this work, Iraqi locally bentonite was used as a cheaper adsorbent for methylene blue from aqueous solution. The second aim of the present study is to make a comparison between English bentonite and Iraqi bentonite in different parameters of adsorption of Methylene blue dye from aqueous solution. Some practical parameters affecting adsorption process, in both clays, such as initial dye concentration and the thermodynamic parameters (ΔHº, ΔGº, ΔSº) for the adsorption process also computed and compared.
Materials and Methods: Ten milliliters of different concentrations of methylene blue solutions (5, 10, 15, 20, 25, 30, 35, 40, 45, 50 mg/L) were mixed in water shakerbath with 0.05g of bentonite clay. Supernatants were separated by centrifugation. UV-Visible spectrophotometer technique used to follow up the adsorbed quantities after mixing the dye solution with bentonite. The experiment repeated at three different temperatures (5, 25, 45°C) to measure the thermodynamic parameters (ΔHº, ΔGº, ΔSº) for the adsorption process.
Results: The extent of the methylene blue removal by Iraqi bentonite increased with increase in the initial concentration of the dye and with decrease temperature. Thermodynamic parameters, such as ΔHº, ΔGº, and ΔSº have been calculated by using the thermodynamic equilibrium coefficient obtained at different temperatures and concentrations.
Iraqi bentonite :( ΔHº=-32.04 KJ.mol-1, ΔGº=-14.78 KJ.mol-1, ΔSº=-57.91J.mol-1. ºK-1).
English bentonite: (ΔHº=20.21 KJ.mol-1, ΔGº=-5.17KJ.mol-1, ΔSº=85.16 J.mol-1. ºK-1).
Conclusion: Both English and Iraqi bentonite clays have ability to adsorb methylene blue. The dye removal increased with increase in the initial concentration of the dye. There is no significant difference in the amounts of dye adsorbed by both clays indicated the possible symmetry in the active sites of bentonite clays even they come from different origin. Thermodynamical data indicate that the adsorption of methylene blue on Iraqi bentonite is exothermic and spontaneous and high heat of adsorption indicates possibility of chemisorption process in addition to other ordinary forces including in adsorption. While same process on English bentonite is endothermic, spontaneous with very low free energy change. In conclusion, Iraqi bentonite clay is cheaper, available and has identical adsorptive activities for methylene blue. This research opens a series of studies for the uses of this Iraqi bentonite as adsorbent for different substances in pollution, medicine, supporter, and different fields in industry.

This study investigated the use of activated rice- husk as adsorbent for the removal of Janus Green B dye from industrial wastewater.
Adsorption studies were carried out in a batch process with adsorbent dose , contact time , pH , initial dye concentration and adsorbents’ particle size at ambient temperature . The well Known Langmuir and Freundlich isotherm models were applied for the equilibrium adsorption data and the various isotherm parameters were evaluated .
The results indicate that activated rice – husk could be employed as a low cost alternative to commercial activated carbon in wastewater treatment for the removal of colour and dyes .