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| Effect of humic acid from different sources on the aggregation behavior of titanium dioxide nanoparticles |
| Received:April 19, 2019 |
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| KeyWord:titanium dioxide nanoparticles;humic acid;adsorption behavior;suspension/settlement behavior;fourier infrared spectroscopy;X-ray photoelectron spectroscopy |
| Author Name | Affiliation | E-mail | | ZHANG Hua | Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resource, Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | ZHAO Tian-hui | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | FANG Meng-yuan | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | ZHAO Xiao-li | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | TANG Zhi | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | tzwork@hotmail.com |
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| Abstract: |
| The aim of the study is to explore the effect of humic acid(HA)from different sources on the suspension/settlement behavior of titanium dioxide nanoparticles(TiO2 NPs). The adsorption of HA from two different sources[humic acid extracted from Leonardite(HAL) and Suwannee River Ⅱ(HAS)] on the surface of TiO2 NPs under different solution pH values was investigated. The results revealed the adsorption complied with both the Langmuir and Freundlich adsorption isotherm models, and the adsorption capacity gradually decreased with increasing solution pH. At pH 3.0, the adsorption amount of HAL and HAS was 99.01 mg·L-1 and 63.46 mg·L-1, respectively. The adsorption kinetics of HA from both sources on TiO2 NPs complied with the second-order kinetic equation, and the initial adsorption rate of HAL was higher than that of HAS. The effects of pH and HA on the suspension/settlement behavior of TiO2 NPs were studied. The results demonstrated that the surface potential decreased as pH reached the isoelectric point of TiO2 NPs, and the adsorption amount of HAL was larger than that of HAS. Thus, HAL had a more prominent influence on the suspension stability of TiO2 NPs. The results of Fourier infrared spectroscopy and X-ray photoelectron spectroscopy indicated that the aromatic and carboxylic acids in HA could interact with the hydroxyl groups on the surface of TiO2 NPs. Therefore, the different sources of HA would influence the environmental behavior of TiO2 NPs and its potential impact on the aquatic ecosystem cannot be ignored. |
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