الفهرس 
Comparative study on efficiency of zeolites-based on Egyptian bentonitic rock for Wastewater Treatment
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Abstract
The removal of heavy metals such as (Cd, Ni, Cr, etc.) from
contaminated water/wastewater had been received great attention, because of
the adverse impact on the health and the natural environment. Various
techniques used for the removal of different pollutants from wastewater.
However, adsorption process onto solid substrate was preferred because of its
high efficiency, easy handling, and cost effectiveness. Adsorption techniques
provide an attractive alternative treatment, especially if the adsorbent was
inexpensive and readily available. The advantage of the adsorption process
was its sludge free, clean operation, and complete removal of pollutants even
from dilute solution. Therefore a comparative study was addressed for
utilizing low-cost natural resource (Bentonitic rock) in the preparation of
different forms of synthetic zeolites batches, using two different routes;
microwave (M-H) and Conventional (C-H) hydrothermal heating. The
evaluation of both M-Zb (microwave) and C-Zb (Conventional) zeolitic
products were evaluated for the efficient removal of four metal ions Cr(III),
Cd(II), Pb(II) and Ni(II) from wastewater via the adsorption method. Zeolite
mixture phases and morphologies were characterized by X-ray diffraction
(XRD), scanning electron microscope (SEM) and EDS elemental analyses.
Kinetic and adsorption isotherm models had been inspected in the evaluation
of the effluent elimination. Although the lab results at metal concentration of
100.09 mg/L, pH 6.5 and 2g/L zeolite dose implied the effective use of both
synthetic products, the microwave mix (M-Zb) indicated more efficient
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removal of metal ions from the wastewater than that recorded for the C-Zb
materia