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Abstract
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Methoxy polyethylene glycol modified magnetite nanoparticles (PEGMNs) were
synthesized and characterized by scanning electron microscopy (SEM), vibrating
sample magnetometer (VSM), and X-ray diffraction (XRD). The adsorption of diazinon
onto PEGMNs was investigated by UV-Vis spectrophotometry at 236 nm, through
batch experiments. The effects of adsorbent dosage, solution pH, contact time,
solution temperature and water impurities on the adsorption of diazinon onto
PEGMNs were investigated. The process of adsorption was increased rapidly in the
first contact period of 10 min. The adsorption at equilibrium (qe) was found to
increase with increasing pH. The results of diazinon removal at various PEGMNs
dosages demonstrated that the optimum dose of PEGMNs was 1mg. The amount of
adsorption of diazinon at equilibrium increased with an increasing temperature from
15°C to 45°C that indicateds an endothermic process. Therefore, PEGMNs were used
as an efficient absorbent for the removal of diazinon
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