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Register a new userStudy of the Efficiency of Tuff and Modified JordanianNatural Zeolite to Remove the Iron Ions (Fe+2)offAqueous Solutions
دراسة كفاءة الزيولايت الطبيعي الأردني الخام و المعدل في ازالة ايونات الحديد (Fe+2) من المحاليل المائية
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درست امكانية استخدام الزيولايت الطبيعي الأردني الخام و المعدل لإزالة ايونات الحديد من المحاليل المائية و الذي يمثل احد المعادن الثقيلة الموجودة احيانا في المياه العذبة الجوفيه. حيث تم استخدام الفلتره الثابتة لأجراء تجارب ازالة ايونات الحديد المحضر في محاليل معياريه و كذلك الموجود في مياه جوفيه حقيقتيه. درس تأثير بعض المتحولات على عملية التبادل الأيوني مثل: التركيز , الماده المستخدمه في التعديل و درجة حموضة المياه (PH) و قد تم استخدام الزيولايت الصناعي (A 4ِ)للمقارنة . حددت مواصفات الزيولايت ألمستخدم تحديد المساحه السطحيه النوعيه وفق طريقةBET, و بواسطة بعض الطرائق الأخرى مثل : .XRD , XRF, TGA ,FTIR وجد ان الزيولايت المعدل بكلوريد الصوديوم هو الأكثر فعاليه مقارنه بالأملاح الأخرى و ان كفاءة التبادل الأيوني لأيون ألحديد تعتمد على التركيز, كما وجد ان قيمة PH تؤثر بشكل واضح على فعالية الزيولايت. لقد كان زمن الاتزان الكيميائي بعد 250 دقيقه و وجد ان النتائج تتطابق مع نموذج لانغمير (Langmuir).
The possibility of using tuff and modified Jordanian naturalzeolite to remove the iron ions, a model component of heavy metals in underground water, off aqueous solution were studied. Bench-scale process was used to remove the iron ions off standard solutions and real under ground water. Different parameters affected the ion exchange have been investigated, such as concentration, modifier type and PH. Zeolite characterizations weredetermined as XRD, XRF, BET, TGA, andFTIRmethods.We found that the modified zeolite with sodium chloride had more effect than other salts and the iron ions exchange efficiency depends on concentration.Zeolite efficiency was affected by PH value. Time of sorption equilibrium achieved within 250 min. The results agree with Langmuir model.
References used
It has been found that modified zeolitic tuff treated with chemicals can increase iron removal efficiency as ion exchange capacity is increased
Sodium treated zeolitic tuff has the maximum exchange capacity among other types of calcium and acid treated zeolites
Extended exposure of philipsite samples to concentrated sodium solutions has been found to be ineffective in displacing all the cation ions from this zeolite, and the sample may require extensive conditioning over several days, with high concentration of selected cation to obtain the homoionic form
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In this work the process of removal of zinc ions from aqueous solutions was studied using natural Syrian zeolite. Two samples were used: natural zeolite Z and modified zeolite with NaCl solution Z-Na. The removal percentage of zinc ions vs. time was
determined using differential initial concentrations of Zn+2: 50,100,200,300,400 mg/L. The contact time was determined and it was 360 min. The removal of Zn+2 ions as a function of temperature and pH have been studied. It was found the increasing of removal percentage by increasing temperature and increasing when pH increasing up to ~7,then the precipitation of zinc hydroxide accurse. The Langmuire adsorption isotherm equation used to calculate the maximum sorption capacity and it was 21.7 and 28.5 mg/g for Z and Z-Na respectively. Results indicate a significant potential for the natural and modified zeolite as an adsorbent/ion-exchange materials for heavy metal removal.
studied the elimination of lead using natural zeolite by studding the the best
conditions to removal lead in a system with two phase: liquid (contaminated water with
lead)-solid (natural zeolite), correlation of the following factors: time of mixin
g phase,
granular size of solid phase, change of pH values, concentration of the calcium element as
a competitor element for the available sites for occupation on the solid phase, the ratio V/m
represents the size of the aqueous phase to the mass of the solid phase and concentration of
lead element.
On the other hand, the possibility of using natural zeolite as a template for storaging
dangerous materials such as lead, has been studied by changing water quality, pH and
temperature.
The results of this research show that and under the following experimental
conditions: time of mixing=4hour, mix of granular size of solid phase, pH< 8,
concentration of calcium = 20 ppm,V/m=100 and concentration of lead = 1000 ppm , the
rate of lead removal range from 60% to 99%.
On the other hand, the results of this research show that changing water quality has
no impact on the ability of natural zeolite for storaging lead as a hazardous waste, while
pH changes have minor effects on this ability of retention and an effect for the high
temperatures on the template was also observed.
The Syrian natural zeolite from om'ozon area has been studied as adsorbent for Ni(II) ions from aqueous solution. The removal of Ni(II) ions under different conditions was studied adsorption of Ni(II) enhanced with an increase of initial concentratio
n, temperature and PH .all experiments were carried out at contact time 6h.
The amount of Ni(II) adsorption was increased from 16.36 mgNi/g for initial solution concentration of 100mg Ni/l to 71.33 mgNi/g (for C0=1000mgNi/L). The experimental data fitted well to Langmuir isotherm. The maximum capacity was qmax=142.85mgNi/g Adsorption amount at 298K varies from 16.36mgNi/g for initial solution concentration of 100mg Ni/l to 47.93mg Ni/g(for C0=400mgNi/L) and it increases at 333K to 16.65 mgNi/g and 51mgNi/g (for C0=100 and 400 mg Ni/L )respectively. The adsorption of Ni(II) ions was increased by increasing PH up to ~ 5 and then stabilized up to PH=6 and after that the precipitation process was accured.
Syrian natural zeolit was used to study the adsorption of phenol from aqueous
solutions. Batch method was used to study the adsorption process.
The results showed that the adsorption process accurs rabidly at the first time and the
equilibrium ach
ieved after 120min .
The adsorption process performed in the rang of PH (3-10). The adsorption of phenol
increased by increasing of PH value up to(6-7) and then decreased.
The temperature affect the adsorption process and the results showed that the
increasing of the temperature leads to decreasing of the adsorption of phenol.The
maximum adsorption amount of phenol was 8 mg/g at 25C0 when the initial concentration
of phenol was 60mg/l.
Adsorption amount of phenol increased when the adsorbent dosage increased up to
0.3g of zeolite.
The resulted data of the adsorption isotherm were fitted with Langmuire model and
the monomolecular layer adsorption formed on the surdace of the adsorbent.
This search aims to study the adsorption of Cu ions from their solutions
on the surface of silicon oxide.
These experiments were in five groups, at the first three groups the
amount of the adsorbent was constant, and the concentration of the
adso
rbing ions was changed, after the adsorption is ended the
concentration of Cu remaining ions in the solution was measured, then
the quantities of the adsorbing ions on the surface of silicon oxide were
determined.
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