Thallium mining from industrial wastewaters enabled by a dynamic composite membrane process
Thallium mining from industrial wastewaters enabled by a dynamic composite membrane process
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DOI：
10.1016/j.resconrec.2022.106577
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Zhangxin Wang;Shanshan Liu;Hailong Zhang;Zhongyuan Zhang;Jingzhu Jiang;Di He;Shihong Lin
中科院分区：
文献类型：
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作者：
Zhangxin Wang;Shanshan Liu;Hailong Zhang;Zhongyuan Zhang;Jingzhu Jiang;Di He;Shihong Lin
铊（Tl）是一种稀有但毒性很强的元素。矿产资源的开发利用导致铊（Tl）向水环境中的泄漏风险，严重威胁人类健康。在这项研究中，我们提出了一种新的铊废水处理工艺的基础上，可再生吸附膜，以实现铊去除和回收工业废水。具体地，使用普鲁士蓝（PB）和商业聚偏二氟乙烯（PVDF）膜制造复合膜。如此制造的PB/PVDF复合膜在各种操作条件下（即，渗透通量≤ 140 Lm-2 h-1，pH为3 - 11，初始Tl浓度为50 - 1000 µg/L）。此外，共存的重金属离子（例如，Pb ~（2+）、Cu ~（2+）、Cd ~（2+）、Ni ~（2+）和Zn ~（2+）对PB/PVDF复合膜的除铊效果影响不大。应用水力回洗以回收PB-Tl复合物颗粒作为高含量的Tl源（92.2 ± 11.4mg的Tl/克复合物），而反洗的PVDF膜可以重新用于PB/PVDF复合膜的制造。一个简化的经济分析表明，在所提出的动态复合膜工艺中合成可消耗的Pb的化学成本仅为回收的Tl的价值的1.66%，突出了所提出的工艺用于从工业废水中去除和回收Tl的巨大潜力。
Thallium (Tl) is a rare but highly toxic element. Mineral exploitation and utilization lead to a risk of thallium (Tl) leakage to the aqueous environment, greatly threatening human health. In this study, we propose a novel Tl wastewater treatment process based on a regenerable adsorptive membrane to achieve Tl removal and recovery from industrial wastewaters. Specifically, a composite membrane was fabricated using Prussian blue (PB) and a commercial polyvinylidene fluoride (PVDF) membrane. The as-fabricated PB/PVDF composite membrane exhibited an outstanding Tl removal efficiency (> 95%) at various operating conditions (i.e., a permeate flux ≤ 140 Lm−2h−1, pH from 3 to 11, and an initial Tl concentration from 50 to 1000 µg/L). Moreover, coexisting heavy metal ions (e.g., Pb2+, Cu2+, Cd2+, Ni2+, and Zn2+) had little interference with the Tl removal efficiency of the PB/PVDF composite membrane. Hydraulic backwash was applied to recover PB-Tl composite particles as a high content source of Tl (92.2 ± 11.4 mg of Tl per gram of composite), while the backwashed PVDF membrane can be reused for the fabrication of the PB/PVDF composite membrane. A simplified economic analysis suggests that chemical cost for synthesizing the consumable Pb in the proposed dynamic composite membrane process was only ∼ 6.1% of the value of recovered Tl, highlighting the vast potential of the proposed process for Tl removal and recovery from industrial wastewaters.