Desorption of Mercury Complex from Fe-Modified Montmorillonite Adsorbent Membrane
Desorption of Mercury Complex from Fe-Modified Montmorillonite Adsorbent Membrane
复制标题
DOI：
10.4028/www.scientific.net/kem.814.451
复制
发表时间：
2019-07
期刊：
影响因子：
--
通讯作者：
M. J. Lodo;L. L. Diaz-L.
中科院分区：
文献类型：
--
作者：
M. J. Lodo;L. L. Diaz-L.
随着纳米技术的使用，粘土矿物，特别是蒙脱石，已被重新设计用于环境修复，特别是用于处理含有有害重金属离子的采矿废水。本研究的目的是评估铁改性蒙脱土（Fe-MMT）纳米膜在吸附除汞过程中的实用性。通过静电纺丝法制备的纳米膜，在间歇吸附装置中对氰化汞溶液进行吸附，以确定其吸附效率。在随后的洗脱试验中，测试了洗脱液类型（CH3COOH和C6H807）、洗脱液浓度（0.01 M和0.05 M）和接触时间（3和5小时）三个因素。利用扫描电镜（SEM）对吸附材料的结构进行了研究。通过HD XRF分析，确定了膜中存在的离子，以及初始汞浓度、批吸附后废水中剩余汞的量和解吸金属的量。结果表明，在初始浓度为13.87 ~ 38.9 mg L-1的氰化汞溶液中，Fe-MMT纳米膜对汞的去除率为61.74%。乙酸的解吸效果更好，其解吸效率最高，为31.36% (0.01 M, 5 h)，而柠檬酸的解吸效率为7.40% （0.05M, 3 h）。
With the use of nanotechnology, clay minerals, specifically montmorillonites, have been reengineered to be used in environmental remediation, especially in the treatment of mining wastewater containing hazardous heavy metal ions. The objective of this study is to assess the practicality of using iron-modified montmorillonite (Fe-MMT) nanomembranes in the removal of mercury using the adsorption process. The nanomembranes, which were synthesized via electrospinning, were subjected to mercury cyanide solutions during the batch adsorption set ups to determine the adsorption efficiency. During the subsequent elution tests, three factors– eluent type (CH3COOH and C6H807), eluent concentration (0.01 M and 0.05 M) and contact time (3 and 5 hours) – were tested. SEM images of the mats were acquired to study the structure of the adsorbent. HD XRF analysis was done to identify the ions present in the membrane, as well as the initial Hg concentrations, amount of remaining Hg in the wastewater after batch adsorption and amount of desorbed metal. Results showed that using the Fe-MMT nanomembrane as adsorbent material resulted to 61.74% removal of Hg in the mercury cyanide solutions with initial concentrations of 13.87 to 38.9 mg L-1. Acetic acid exhibited better desorption results, with the highest efficiency of 31.36% (0.01 M, 5 h) compared to citric acid’s 7.40% (0.05M, 3 h).