| 张华,赵天慧,方梦园,赵晓丽,汤智.不同来源腐植酸对二氧化钛纳米颗粒的聚凝行为的影响[J].农业环境科学学报,2019,38(10):2403-2411. |
| 不同来源腐植酸对二氧化钛纳米颗粒的聚凝行为的影响 |
| Effect of humic acid from different sources on the aggregation behavior of titanium dioxide nanoparticles |
| 投稿时间：2019-04-19 |
| DOI：10.11654/jaes.2019-0436 |
| 中文关键词: 二氧化钛纳米颗粒 腐植酸 吸附行为 悬浮/沉降行为 傅里叶红外光谱 X射线光电子能谱 |
| 英文关键词: titanium dioxide nanoparticles humic acid adsorption behavior suspension/settlement behavior fourier infrared spectroscopy X-ray photoelectron spectroscopy |
| 基金项目:国家自然科学基金项目（4167030433） |
| 作者 | 单位 | E-mail | | 张华 | 南昌大学资源环境与化工学院, 鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031
中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | | | 赵天慧 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | | | 方梦园 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | | | 赵晓丽 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | | | 汤智 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | tzwork@hotmail.com |
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| 中文摘要: |
| 为了探讨不同来源腐植酸对二氧化钛纳米颗粒（TiO2 nanoparticles，TiO2 NPs）在水体环境中悬浮/沉降行为的影响，考察了不同溶液pH条件下，两种不同来源腐植酸（风化褐煤腐植酸，HAL；河水腐植酸HAS）在TiO2 NPs表面的吸附。结果表明，HA在TiO2 NPs表面的吸附符合Langmuir和Freundlich吸附等温线模型，吸附量随pH的上升呈现下降趋势，在溶液pH=3.0条件下，HAL和HAS的吸附量分别为99.01 mg·L-1和63.46 mg·L-1。两种HA在TiO2 NPs上的吸附动力学都满足二级动力学方程，HAL的初始吸附速率高于HAS；研究了pH、HA对TiO2 NPs在溶液中的悬浮/沉降行为的影响，结果表明溶液pH值越接近等电点TiO2 NPs越容易沉降，而HAL由于吸附量更大，其对TiO2 NPs的悬浮性能影响更加显著；傅里叶红外光谱和X射线光电子能谱研究结果表明HA中的芳香族和羧酸能够与TiO2 NPs表面的羟基相互作用。因此，在含有不同组分的腐植酸的水体中，TiO2 NPs的环境行为存在一定的差异性，其对水生生态系统的潜在影响不容忽视。 |
| 英文摘要: |
| 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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