Author/Authors :
Naghizadeh، Ali نويسنده Department of Environmental Health Engineering, School of Public Health, Birjand University of Medical Sciences, Birjand, Iran , , Khosravi، Rasoul نويسنده Social Determinants of Health Research Center, Environmental Health Engineering Department, Birjand University of Medical Sciences, Birjand, IR Iran , , Derakhshani، Elham نويسنده Shahid Beheshti University of Medical Sciences , , Shahabi، Habibeh نويسنده Birjand University of Medical Science, Birjand, Shahabi, Habibeh , Ghasemi، Fatemeh نويسنده Department of Biology, Faculty of Science, Urmia University, Urmia, Iran ,
Abstract :
Background & Aims of the Study: Natural organic matters (NOMs) are a mixture of chemically complex polyelectrolytes produced mainly from the decomposition of plant and animal residues that are present in all surface and groundwater resources. This paper evaluates the aqueous NOMs adsorption efficiency on walnut shell modified with Zinc Oxide (ZnO). Materials & Methods: This study examined the feasibility of removing NOMs from aqueous solutions using walnut shell modified with ZnO. The effects of NOMs concentration, modified walnut shell with ZnO dosage, and pH on adsorption of NOMs by modified walnut shell with ZnO were evaluated. Results: The adsorption capacities of modified walnut shell with ZnO in the best conditions were 37.93 mg/g. The results also demonstrated that adsorption capacity of NOMs on modified walnut shell with ZnO was higher in lower pHs due to significantly high electrostatic attraction exists between the positively charged surface of the adsorbent and negatively charged NOMs. And finally adsorption capacity decreases as adsorbent dose increase. Conclusion: Walnut shell modified with ZnO can be proposed as a natural adsorbent in the removal of NOMs from aqueous solutions
