三乙烯四胺插层蒙脱石（TETA-Mt）高效抑制矿山尾矿在酸雨暴露下重金属的释放。
Efficient inhibition of heavy metal release from mine tailings against acid rain exposure by triethylenetetramine intercalated montmorillonite (TETA-Mt).
机构信息
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Key Laboratory of Agro-Environmental Integrated Control, Guangdong Institute of Eco-Environmental Science & Technology, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, PR China; Guangdong Provincial Engineering and Technology Research Centre for Environment Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; Guangdong Environmental Protection Key Lab of Solid Waste Treatment and Recycling, Guangzhou 510006, PR China.
出版信息
J Hazard Mater. 2016 Nov 15;318:396-406. doi: 10.1016/j.jhazmat.2016.07.011. Epub 2016 Jul 6.
The potential application of triethylenetetramine intercalated montmorillonite (TETA-Mt) in mine tailings treatment and AMD (acid mine drainage) remediation was investigated with batch experiments. The structural and morphological characteristics of TETA-Mt were analyzed with XRD, FTIR, DTG-TG and SEM. The inhibition efficiencies of TETA-Mt against heavy metal release from mine tailings when exposed to acid rain leaching was examined and compared with that of triethylenetetramine (TETA) and Mt. Results showed that the overall inhibition by TETA-Mt surpassed that by TETA or Mt for various heavy metal ions over an acid rain pH range of 3-5.6 and a temperature range of 25-40°C. When mine tailings were exposed to acid rain of pH 4.8 (the average rain pH of the mining site where the mine tailings were from), TETA-Mt achieved an inhibition efficiency of over 90% for Cu(2+), Zn(2+), Cd(2+) and Mn(2+) release, and 70% for Pb(2+) at 25°C. It was shown that TETA-Mt has a strong buffering capacity. Moreover, TETA-Mt was able to adsorb heavy metal ions and the adsorption process was fast, suggesting that coordination was mainly responsible. These results showed the potential of TETA-Mt in AMD mitigation, especially in acid rain affected mining area.
采用批实验研究了三乙烯四胺插层蒙脱石（TETA-Mt）在矿山尾矿处理和 AMD（酸性矿山排水）修复中的潜在应用。采用 XRD、FTIR、DTG-TG 和 SEM 对 TETA-Mt 的结构和形态特征进行了分析。考察并比较了 TETA-Mt 对酸雨淋滤下矿山尾矿中重金属释放的抑制效率与三乙烯四胺（TETA）和 Mt 的抑制效率。结果表明，在 3-5.6 的酸雨 pH 值范围和 25-40°C 的温度范围内，TETA-Mt 对各种重金属离子的总体抑制作用超过了 TETA 或 Mt。当矿山尾矿暴露于 pH 4.8 的酸雨（来自矿山尾矿的矿山所在地的平均雨水 pH 值）时，TETA-Mt 对 Cu(2+)、Zn(2+)、Cd(2+)和 Mn(2+)的释放抑制效率超过 90%，而 Pb(2+)的抑制效率为 70%，温度为 25°C。结果表明，TETA-Mt 具有很强的缓冲能力。此外，TETA-Mt 能够吸附重金属离子，吸附过程很快，表明配位作用起主要作用。这些结果表明 TETA-Mt 在 AMD 缓解方面具有潜力，特别是在受酸雨影响的矿区。
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