Natural zeolite which named TS-14 from Tel- Asis area in Syria has beenstudied.
The sample was crashed under fixed force, 5kg/cm2 and sieved with differentsizesieves.
The product was divided to five samples with different size, andnamedTS-14-1,<0.1
25mm,
TS-14-2, 0.125-0.3mm, TS-14-3, 0.3-0.6mm, TS-14-4, 0.6-85mm, TS-14-5, 0.85-1.4mm.
The specific surface area was calculated. The maximum specific surface area was
84.6m2/g for the first sample which has minimum size, then the value of surface area
decreases to become 54.2m2/g for the second sample, therefore the value of surface area
increases for third and fourthsamples to became 60.3m2/g and 66.3m2/g, respectively.
The adsorption of the Ni(II) ions was studied using the samples. The capacity of the
samples is increasing when the granule size is increasing, and the maximum capacity was
91.7mg/g as Ni(II) ions for last sample. The adsorption process of Ni(II) ions takes place
on the heterogeneous centers.
Fixed bed adsorption columns packed with natural zeolite were used to study the
kinetics of heavy metals removal from the single component solutions of Vanadium, Nikle,
Zinc, and Lead. The system parameters studied include solution flow rate and be
d height.
The effect of competing cations was also studied to establish the effectiveness of natural
zeolite in treating Industrial wastewater under continuous conditions using fixed bed
columns. The metal loaded natural zeolite was regenerated using NaCl . The results from
column studies showed that the Slower flow rates gave better removal efficiencies
compared to faster ones, Longer bed heights also resulted in greater adsorption
efficiencies. The bed depth service time (BDST) model was successfully used to simulate
experimental results at 30 % breakthrough. This model provides the necessary parameters
needed for fixed bed column design, the factor R2 ranged between 0.91 – 0.95. Natural
zeolite was exposed to 3 cycles of adsorption and desorption. The efficiency of the column
in removing heavy metals was high, The results indicate that natural zeolite can be
regenerated and re-used in removing heavy metals from solution.
The research was carried out at Al-Qamishli Agricultural Research Center, GSAR,
Syira, during the seasons 2011, 2012 and 2013, in order to estimate the effect of
adding different levels of a crude Zeolite (T2-20 tons/ha, T3- 40 tons/ha, in addition
to the control (without adding Zeolite T1), on wheat productivity within a bilateral
crop rotation was followed, consisted of wheat and chickpea, and on the content of
nitrogen, phosphorus and potassium in the surface layer of the soil .The research
was conducted using Complete Randomized Block Design with three replicates.
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 study was carried out on the sorption of heavy metals (Pb+2, Zn+2) under static
conditions from single- and multicomponent aqueous solutions by Syrian Zeolite mineral
extracted from south Syria. The removal has an ion-exchange nature and consis
ts of three
stages: the adsorption on the surface of microcrystals, the inversion stage, and the
moderate adsorption in the interior of the microcrystal, The study showed that equilibrium
time is 6 hours, and The slight difference between adsorption capacity of the Zeolite
toward lead, zinc from single- and multicomponent solutions may testify to individual
sorption centers of the zeolite for each metal. The maximum sorption capacity toward pb2+
is determined as 33.89 mg/g at an equilibrium concentration of 261.07 mg/L and toward
Zn+2 as 29.18 mg/g at 309.818 mg/L. Langmuir and Freundlich Adsorption Isotherms
were used to evaluate natural zeolite adsorption performance for Lead, Zinc. These
Isotherms were able to provide suitable fit with experimental data, the factor R2 ranged
between 0.95 – 0.99, with better fit to Langmuir Isotherm.
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.
The study was carried out to remove of heavy metals (V+5, Ni+2)
under static conditions from aqueous solutions by Syrian Zeolite
mineral extracted from south of Syria. The results revealed that
operational conditions such as initial solution pH and concentration,
adsorbent particle size, the presence of competing cations, are able
to affect the adsorption capacity and efficiency of natural zeolite.
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 standar
d 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.
Sulfated ions loaded on natural Syrian zeolite were prepared by impregnation method of zeolite samples in aqueous solution of ammonium sulfate with different concentrations. After that, the samples were dried at 1100C Followed by calcinations at 6000
C. The Characterization tests have been done of prepared catalysts using X.R.D, FTIR, TG-DTA methods and by measurement of surface aria. A new phase of sulfated elements has been formed as a result of binding SO42- ions as sulfated complex coordinated with metal elements. The catalytic activity of sample in polyethylene cracking reaction was increased directly with the percent of sulfate ions.
