Dual-ion permeation Janus membrane-assisted element reconstitution system enables fluorosilicate-oriented recovery from fluoride-rich and silica-rich wastewaters

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2024-11-12 DOI:10.1016/j.watres.2024.122785

Yangbo Qiu , Chao Wang , Ran Li , Lidong Feng , Shuaijun Yu , Jiangnan Shen , Long-Fei Ren , Jiahui Shao

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Abstract

Rapid development of semiconductor manufacturing and photovoltaic industry leads to significant generation of fluoride-rich and silica-rich wastewaters. Due to the emphasis on circular economy and resource recovery, there is a shift from regarding wastewater as waste to a recoverable resource. In this study, we present a uniquely designed dual-ion permeation Janus membrane (DPM)-assisted element reconstitution system (MERS) for selective recovery of high-value fluorosilicates from fluoride-rich and silica-rich wastewaters. The MERS with a configuration of cation-exchange membrane/bipolar membrane/DPM/anion-exchange membrane/cation-exchange membrane achieved HF formation in silica chamber and further SiF₆^2- generation from the reaction of HF with SiO₂. Driven by the electric field, SiF₆^2- was then transported through DPM into acid chamber for fluorosilicates selective recovery. The DPM with positively-charged nanoporous substrate/negatively charged active layer enhanced electrostatic interaction for SiF₆^2-/H⁺ transport and steric exclusion for coexisting foulants rejection. Ion transport mechanism analysis demonstrated DPM enhanced SiF₆^2- migration while inhibiting back diffusion by electrostatic interaction and steric exclusion. Through the application of DPM, MERS showed rejections over 99 % for nanoparticles and over 90 % for organics. Thus, MERS stably selectively recovered SiF₆^2- with recovery rate over 85 % and fluorosilicates purity over 99.5 %. Compared to traditional technologies, MERS achieved valuable resource recovery with the advantages of simple operation, small footprint and no secondary pollutant generation. Overall, this study provides a new strategy for simultaneous recovery of fluoride and silica from different waste streams, enabling a more sustainable strategy for semiconductor and photovoltaic industries development.

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双离子渗透 Janus 膜辅助元素重组系统可从富含氟化物和二氧化硅的废水中回收氟硅酸

半导体制造和光伏产业的快速发展产生了大量富含氟化物和二氧化硅的废水。由于对循环经济和资源回收的重视，人们正从将废水视为废物转变为可回收资源。在这项研究中，我们提出了一种独特设计的双离子渗透 Janus 膜（DPM）辅助元素重组系统（MERS），用于从富含氟化物和二氧化硅的废水中选择性回收高价值的氟硅酸盐。采用阳离子交换膜/双极膜/DPM/阴离子交换膜/阳离子交换膜配置的 MERS 可在二氧化硅室中形成 HF，并通过 HF 与 SiO2 的反应进一步生成 SiF62-。在电场的驱动下，SiF62- 通过 DPM 进入酸室，进行氟硅酸盐的选择性回收。带正电荷的纳米多孔基底/带负电荷的活性层的 DPM 增强了静电相互作用，促进了 SiF62-/H+ 的传输，并增强了立体排斥作用，实现了共存污物的排斥。离子传输机理分析表明，DPM 增强了 SiF62- 的迁移，同时通过静电作用和立体排斥抑制了反向扩散。通过应用 DPM，MERS 对纳米颗粒的排斥率超过 99%，对有机物的排斥率超过 90%。因此，MERS 稳定地选择性回收了 SiF62-，回收率超过 85%，氟硅酸盐纯度超过 99.5%。与传统技术相比，MERS 具有操作简单、占地面积小、不产生二次污染物等优点，实现了有价值的资源回收。总之，这项研究为从不同废物流中同时回收氟化物和二氧化硅提供了一种新策略，为半导体和光伏产业的发展提供了一种更可持续的策略。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.