Adsorption Properties of Nickel Using nZVI, D-nZVI and Diatomite

In recent years,  nano Zero valent iron (nZVI)  have been used to  remediate from polluted groundwater. However the application of  nZVI has limitations such as particles agglomeration and filtration of nano particles. This research has been conducted to enhance the usability of nZVI  by supporting with diatomite during synthesis. The characterization for nZVI particle and dolomite supported (D-nZVI) was performed using XRD, SEM/EDAX, TEM, and BET-N2.nZVI, D-nZVI and pure diatomite  are used  as adsorbents and  nickel  solution were applied as heavy metal adsorbents to remove the aqueous Ni2+ ions and varying factors including adsorbent dosage, solution pH, contact time, and initial metal concentration have been investigated. The Langmuir and Freundlich adsorption isotherm models over a wide initial concentration dosages were used in order to determine the adsorbents adsorption capacity that results showed that D-nZVI  has a higher adsorption capacity, and Also fitting the data using these models showed that the adsorption of all adsorbents are in good agreement with the Langmuir model.  The adsorption capacity of  the above adsorbents were found, 66.67, 166.67, 13.16 mg/g, respectively .The removal kinetics were modeled by pseudo first-order and pseudo second-order models and the results showed that removal of Ni2+ by  all adsorbents could be better expressed by pseudo second-order kinetics.