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Register a new userContribution to the study of the possibility of using natural zeolite in the ramoval of lead ions from aqueous solutions
مساهمة في دراسة إمكانية استخدام الزيوليت الطبيعي في إزالة أيونات الرصاص من المحاليل المائية
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درست إمكانية إزالة الرصاص باستخدام الزيوليت الطبيعي في منظومة ذات طورين: سائل (مياه ملوثة بالرصاص) – صلب ( زيوليت طبيعي ), و ذلك بتابعية العوامل التالية: زمن خلط الطورين, الحجم الحبيبي للطور الصلب, تغير قيم درجة الحموضة pH, تركيز عنصر الكالسيوم كعنصر منافس للمواقع المتاحة للارتباط على الطور الصلب, النسبة V/m كنسبة تمثل حجم الطور المائي على كتلة الطور الصلب و تركيز عنصر الرصاص. بالمقابل, درست إمكانية استخدام الزيوليت الطبيعي كقالب لتوضيب مواد خطرة كالرصاص و ذلك بتغيير نوعية المياه و درجة الحموضة و درجة الحرارة. تظهر نتائج هذا البحث, أنه, و ضمن الشروط التجريبية التالية: زمن خلط يساوي أربع ساعات, خليط من الحجوم الحبيبية, درجة pH اقل من 8, نسبة V/m تساوي 100, تركيز الكالسيوم كعنصر منافس يساوي 20 ppm و تركيز عنصر الرصاص كعنصر ملوث 1000 ppm, فإن نسبة إزالة الرصاص تتراوح بين 60% و 99%. من جهة ثانية, تبين نتائج هذا البحث, أن تغير نوعية المياه لا يمارس أي تأثير على مقدرة احتفاظ الزيوليت الطبيعي بالرصاص كنفاية خطرة, في حين تلعب درجة الحموضة تأثيرات طفيفة على هذه المقدرة و كذلك فإن درجات الحرارة المرتفعة تؤثر على قدرة احتفاظ القالب بالرصاص.
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 mixing 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.
References used
AUBERT ,J. E.; HUSSON ,B.; SARRAMONEN.,F. Utilization of municipal solid waste incineration (MSWI) fly ash in bended cement. S. Of Hazard Materials, 2006,624 -631
JARUP.L. Hazards of heavy metals contamination. Department of epidemiology and public health , imperial college, London ,UK
JAISHANKAR, M.; TSETEN,T.; ANBALAGAN, N.; MATHEW, B.; BEEREGOWDA , K. Toxicity, mechanism and health effects of some heavy metals . Department of biotechnology, sapthagiri college of engineering, Bangalore-57, Karnataka,India,2014
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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.
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.
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.
In this search, the removal of copper and lead ions from aqeous solutions by flotation had
been studied, and the effect of various factors on the removal process.
The study showed that the removal of copper and lead ions was increased by increasing
the
value of the solution pH up to pH = 8 and the removal rate was 80%.
At pH = 10 precipitation of the ions was obtained in the form of hydroxides.
The removal ratio of both ions is increased by increasing the flow of the air within the
solution to reach 98% for copper and 97% for lead at the flow of Q = 1000 ml/min and
then the removal rate decreases to 60% with increasing airflow to Q = 1500 ml/min.
The initial concentration values affect the removal process and the increase in the removal
ratio was shown by increasing the initial concentration. The removal rate of copper ions
was 50 % at the initial concentration of C0 = 50 mg / l to 98% at C0 = 100 mg / l. While the
lead removal rate was 61 % at the initial Concentration C0 = 50 mg/l to 97% at
concentration C0 = 100 mg / l.
The changes in coefficient of distribution of lead and cupper has been studied in
system with two phases, liquid water contaminated with lead and copper-solid (natural
Phosphate of Syria) correlation of the following factors: Time of mixing phases,
size of the
developed steel ,change the values of PH ,concentration of elemental lead and
concentration of element capper ,the concentration of calcium as a competitor to the
occupation of sites available on the solid phase, the ratio V\m presents the water phase size
on the mass of phase ,the Percentage removal of lead from aqueous samples prepared in
the laboratory91,57-99,95% were the best conditions for a vast proportion removed can be
summarized as follows:
PH=[6,63-10,11], Time of mixing phases =60 minutes and V/m=1000.
The Percentage removal of copper from aqueous samples prepared in the
laboratory 95,27 -99,96 % were the best conditions for a vast proportion removed can be
summarized as follows:
PH= [7,89-11,01] , Time of mixing phases =60 minutes and V/m=1000.
Ideal conditions have been applied that were obtained according to laboratory tests
on water samples from industrial input to Banias refinery and water samples from
industrial drainage to Syrian company for oil transport after Removal for lead was(
100%,99 %). Removal for copper was( 100%,98 %) .
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