Science Inventory

An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid

Citation:

Wang, L., C. Han, M. Nadagouda, AND D. Dionysiou. An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid. JOURNAL OF HAZARDOUS MATERIALS. Elsevier Science Ltd, New York, NY, 313:283-290, (2016).

Impact/Purpose:

Water Treatment

Description:

Zinc oxide (ZnO)-coated zeolite adsorbents were developed by both nitric acid modification and Zn(NO3)2•6H2O functionalization of zeolite. The developed adsorbents were used for the removal of humic acid (HA) from aqueous solutions. The adsorption capacity of the adsorbents at 21±1 oC was up to 60 mgC•g−1. The synthesized materials were characterized by porosimetry analysis, scanning electron microscopy, X-Ray diffraction analysis, Raman spectroscopy, and high resolution transmission electron microscopy. The results showed the positive charge density of ZnO-coated zeolite adsorbents was proportional to the amount of ZnO coated on zeolite and thus, ZnO-coated zeolite adsorbents exhibited a greater affinity for counter ions. Furthermore, the adsorption capacity of ZnO-coated zeolite adsorbents increased remarkably after acid modification. Batch experiments demonstrated ZnO-coated zeolite adsorbents possessed high adsorption capacity to remove HA from aqueous solutions due to strong electrostatic interactions between negative functional groups of HA and positive charges of ZnO-coated zeolite adsorbents.

URLs/Downloads:

http://dx.doi.org/10.1016/j.jhazmat.2016.03.070   Exit

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Product Published Date: 08/05/2016
Record Last Revised: 05/24/2016
OMB Category: Other
Record ID: 314250

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

WATER SUPPLY AND WATER RESOURCES DIVISION

WATER QUALITY MANAGEMENT BRANCH