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| Effects of humic acid on the adsorption of copper (Ⅱ) onto zinc oxide |
| XIE Fa-zhi1,2, XIE Zhi-yong1,3, LI Guo-lian1,2, LI Hai-bin1,2, WANG Xue-chun1,3, YUE Xian-ming1,3, LI Zhen-yu1,3 |
1. Anhui Key Laboratory of Water Pollution Control and Wastewater Resource, Hefei 230601, China;
2. School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China;
3. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China |
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Abstract To study the influence of humic acid on the adsorption of Cu (Ⅱ) by zinc oxide, the adsorption of Cu (Ⅱ) on zinc oxide in different environment conditions were investigated, by changing the order of addition and dosage of HA. The mechanism of fate and transport of Cu (Ⅱ) in the water environment was also proposed. The results showed that the adsorption Cu(Ⅱ) on zinc oxide could be significantly reduced by adding HA, and that the Cu (Ⅱ) maximum adsorption decreased 61.74% by adding 50mg/L HA in the pH of 5.05. The Cu (Ⅱ) adsorption increased by increasing the ionic strength, the maximum adsorption was 21.79mg/g when the concentration of NaNO3 was 1.0mol/L. When the pH value was 5.05 the adsorption reached the maximum; and temperature was in favor of Cu (Ⅱ) adsorption on zinc oxide. Cu (Ⅱ) adsorption on zinc oxide fitted the Freundlich model well. The adding orders of HA influence the Cu (Ⅱ) adsorption as the following:non-adding > adding after > adding simultaneously > adding ahead. The characteristics of infrared spectra showed that HA and Cu (Ⅱ) form competitive adsorption on the surface adsorption and surface hydroxyl of zinc oxide play an important role in adsorption of HA and Cu (Ⅱ).
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Received: 02 February 2017
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