Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 313, Issue -, Pages 283-290Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.03.070
Keywords
Electrostatic interaction; Humic acid; Water treatment; Zeolite; Zinc oxide; Natural organic matter
Categories
Funding
- Natural Science Foundation of Fujian Province, P.R. China [2014J01055]
- Cyprus Research Promotion Foundation - European Regional Development Fund
- Republic of Cyprus (Strategic Infrastructure Project NEA) [YPiODeltaOMH/SigmaTPATH/0308/09]
- National Risk Management Research Laboratory
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Zinc oxide (ZnO)-coated zeolite adsorbents were developed by both nitric acid modification and Zn(NO3)(2)center dot 6H(2)O functionalization of zeolite 4A. The developed adsorbents were used for the removal of humic acid (HA) from aqueous solutions. The synthesized materials were characterized by porosimetry analysis, scanning electron microscopy, X-Ray diffraction analysis, and high resolution transmission electron microscopy. The maximum adsorption capacity of the adsorbents at 21 +/- 1 degrees C was about 60 mgCg(-1). The results showed that 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 negatively charged ions. Furthermore, the adsorption capacity of ZnO-coated zeolite adsorbents increased markedly after acid modification. Adsorption experiments demonstrated ZnO-coated zeolite adsorbents possessed high adsorption capacity to remove HA from aqueous solutions mainly due
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