文献类型：期刊文献

英文题名：Investigation of the migration of natural organic matter-iron-antimony nano-colloids in acid mine drainage

作者：Zhang, Yuqin Wu, Pan Zhu, Jian Liao, Peng Niyuhire, Elias Fan, Feifei Mao, Wenjian Dong, Lisha Zheng, Ruyi Li, Yi

第一作者：Zhang, Yuqin

通信作者：Zhu, J[1];Liao, P[2]

机构：[1]Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Guizhou Karst Environm Ecosyst Observat & Res Stn, Guiyang 550025, Peoples R China;[2]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China;[3]Ctr Rech Sci & Perfectionnement Profess, Ecole Normale Super, Dept Sci Naturelles, Blvd Mwezi Gisabo,BP 6983, Bujumbura, Burundi;[4]Guizhou Inst Soil & Fertilizer, Guiyang 550006, Peoples R China;[5]Guizhou Inst Technol, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Guizhou Karst Environm Ecosyst Observat & Res Stn, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Resources & Environm Engn, Key Lab Karst Georesources & Environm, Guizhou Karst Environm Ecosyst Observat & Res Stn, Guiyang 550025, Peoples R China;corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China.

年份：2024

卷号：918

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20240715539083);Scopus(收录号：2-s2.0-85184522675);WOS:【SCI-EXPANDED(收录号:WOS:001184131500001)】；

基金：This study was supported by Guizhou Science Cooperation Platform Talents - GCC[2023]045, the National Natural Science Foundation of China (NO. 42267030), the National Natural Science Foundation of China (NO. 42177237), the Innovation and Entrepreneurship Talents of Guizhou Province (NO. GZQ202208091), the Science and Technology Planning Project of Guizhou Province (Qian Ke He Zhi Cheng, 2022-217), and the Guizhou Science and Technology Cooperation (KY [2018] 254).

语种：英文

外文关键词：Antimony; Acid mine drainage; Natural organic matter; Colloid formation; Colloid migration

摘要：Colloids can potentially affect the efficacy of traditional acid mine drainage (AMD) treatment methods such as precipitation and filtration. However, it is unclear how colloids affect antimony (Sb) migration in AMD, especially when natural organic matter (NOM) is present. To conduct an in-depth investigation on the formation and migration behavior of NOM, iron (Fe), Sb and NOM-Fe-Sb colloids in AMD, experiments were performed under simulated AMD conditions. The results demonstrate significant variations in the formation of NOM-Fe-Sb colloids (1-3-450 nm) as the molar ratio of carbon to iron (C/Fe) increases within acidic conditions (pH = 3). Increasing the C/Fe molar ratio from 0.1 to 1.2 resulted in a decrease in colloid formation but an increase in particulate fraction. The distribution of colloidal Sb, Sb(III), and Fe(III) within the NOM-Fe-Sb colloids decreased from 68 % to 55 %, 72 % to 57 %, and 68 % to 55 %, respectively. Their distribution in the particulate fraction increased from 28 % to 42 %, 21 % to 34 %, and 8 % to 27 %. XRD, FTIR, and SEM-EDS analyses demonstrated that NOM facilitates the formation and crystallization of Fe3O4 and FeSbO4 crystalline phases. The formation of the colloids depended on pH. Our results indicate that NOM-Fe-Sb colloids can form when the pH <= 4, and the proportion of colloidal Sb fraction within the NOM-Fe-Sb colloids increased from 9 % to a maximum of 73 %. Column ex- periments show that the concentration of NOM-Fe-Sb colloids reaches its peak and remains stable at approxi- mately 3.5 pore volumes (PVs), facilitating the migration of Sb in the porous media. At pH >= 5, stable NOM-Fe-Sb colloids do not form, and the proportion of colloidal Sb fraction decreases from 7 % to 0 %. This implies that as pH increases, the electrostatic repulsion between colloidal particles weakens, resulting in a reduction in the colloidal fraction and an increase in the particulate fraction. At higher pH values (pH >= 5), the repulsive forces between colloidal particles nearly disappear, promoting particle aggregation. The findings of this study provide important scientific evidence for understanding the migration behavior of NOM-Fe-Sb colloids in AMD. As the pH gradually shifts from acidic to near -neutral pH during the remediation process of AMD, these results could be applied to develop new strategies for this purpose.