Author/Authors :
Tashauoei، H R نويسنده Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan 14155-6359, Iran , , Movahedian Attar، H نويسنده Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan 14155-6359, Iran , , Kamali، M نويسنده Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan 81746-73441, Iran , , Amin، M M نويسنده Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan 14155-6359, Iran , , Nikaeen، M نويسنده Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan 14155-6359, Iran ,
Abstract :
Chromium (VI) adsorption behavior and capacity by surface modified nanozeolite A has been
investigated. Surface modification was performed and the morphology of modified and unmodified nanozeolite
was studied using Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM).
Adsorption isotherms were studied under different conditions (pH, adsorbent dose, adsorbate concentration
and interaction time). The Langmuir monolayer adsorption capacity (qm) was found to be 14.16 mg Cr(VI) per
gram at pH = 3.0 at room temperature. Chromate adsorption on surface modified nanozeolite A was found to
be inversely proportional to the pH. Effect of competitive ions was studied and it was found that there is no
significant competition between chromate adsorption and presence of competitive ions. Results revealed that
Langmuir model is in good agreement with experimental re-sults. Results of examinations on a polluted natural
sample showed that surface modified nanozeolite A could reduce chromium (VI) concentration to acceptable
criteria. Based on results, surface modified nanozeolite A is an effective sorbent for removing chromate from
aquatic solution and the adsorption ability is enhanced by surface modification.
