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钙和腐殖酸对纳米 TiO 降解莠去津的影响：性能和机制。

Effects of Ca and fulvic acids on atrazine degradation by nano-TiO: Performances and mechanisms.

机构信息

College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China.

Hunan Dalu Technology Co., Ltd, 559 Yunxi Road, Yuelu, Changsha, Hunan, 410036, China.

出版信息

Sci Rep. 2019 Jun 20;9(1):8880. doi: 10.1038/s41598-019-45086-2.

DOI:10.1038/s41598-019-45086-2
PMID:31222038
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6586927/
Abstract

In this study, the adsorption and UV photocatalytic degradation of atrazine using nano-TiO particles were studied systematically, and the colloidal stability of nano-TiO particles in solution was also investigated to reveal the removal mechanism. Experiments which contained the first 6.0 hours darkness and 4.0 hours UV illumination later were conducted at different concentrations of Ca and/or fulvic acids (FA) at pH = 7.0. Results showed that the adsorption rate of atrazine onto nano-TiO particles decreased with the increase of Ca and/or FA concentrations, which could be explained well by the colloidal stability of nanoparticles. When the solution contained Ca or Ca-FA, the nanoparticles were aggregated together leading to the decrease of the contact surface area. Besides, there existed competitive adsorption between FA and atrazine on the particle surface. During photocatalytic degradation, the increase of Ca and/or FA concentration accelerated the aggregation of nano-TiO particles and that reduced the degradation efficiency of atrazine. The particle sizes by SEM were in accordance with the aggregation degree of nanoparticles in the solutions. Sedimentation experiments of nano-TiO particles displayed that the fastest sedimentation was happened in the CaCl and FA coexistent system and followed by CaCl alone, and the results well demonstrated the photodegradation efficiency trends of atrazine by nano-TiO particles under the different sedimentation conditions.

摘要

在这项研究中，系统地研究了纳米 TiO 颗粒对莠去津的吸附和紫外光催化降解作用，并研究了纳米 TiO 颗粒在溶液中的胶体稳定性，以揭示去除机制。在 pH=7.0 时，在不同 Ca 和/或腐殖酸 (FA) 浓度下进行了包含最初 6.0 小时黑暗和 4.0 小时 UV 照射的实验。结果表明，莠去津在纳米 TiO 颗粒上的吸附速率随 Ca 和/或 FA 浓度的增加而降低，这可以通过纳米颗粒的胶体稳定性很好地解释。当溶液中含有 Ca 或 Ca-FA 时，纳米颗粒会聚集在一起，导致接触表面积减小。此外，FA 和莠去津之间存在竞争吸附在颗粒表面上。在光催化降解过程中，Ca 和/或 FA 浓度的增加会加速纳米 TiO 颗粒的聚集，从而降低莠去津的降解效率。SEM 得到的颗粒尺寸与溶液中纳米颗粒的聚集程度一致。纳米 TiO 颗粒的沉降实验表明，在 CaCl 和 FA 共存体系中沉降最快，其次是单独的 CaCl，这一结果很好地证明了在不同沉降条件下纳米 TiO 颗粒对莠去津的光降解效率趋势。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/6e0632b185cd/41598_2019_45086_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/ca6135355ced/41598_2019_45086_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/e3d13a564004/41598_2019_45086_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/ba239c38ef16/41598_2019_45086_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/a29ab4ec24f6/41598_2019_45086_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/0959aa5c7b3a/41598_2019_45086_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/4dac1d12b69b/41598_2019_45086_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/109b8949835b/41598_2019_45086_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/4a17e163db8d/41598_2019_45086_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/6e0632b185cd/41598_2019_45086_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/ca6135355ced/41598_2019_45086_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/e3d13a564004/41598_2019_45086_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/ba239c38ef16/41598_2019_45086_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/a29ab4ec24f6/41598_2019_45086_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/0959aa5c7b3a/41598_2019_45086_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/4dac1d12b69b/41598_2019_45086_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/109b8949835b/41598_2019_45086_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/4a17e163db8d/41598_2019_45086_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e36a/6586927/6e0632b185cd/41598_2019_45086_Fig9_HTML.jpg

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