Results in Engineering
·
2023
·
IF 5
Qinliang Jiang,Yiwen Wang,Yi Li,Jianquan Luo,Jihai Xiong
The incorporation of nanomaterials into the selective layer of nanofiltration membranes can effectively enhance membrane performance. However, the agglomeration of nanoparticles inevitably leads to defects in the membrane PA layer. To address this issue, this paper reports a novel nanocomposite substrate-supported thin-film composite (TFC) nanofiltration membrane with good stability and excellent separation performance. Inorganic two-dimensional O–MoS 2 nanosheets were embedded into a polysulfone (PSF) substrate by a non-solvent-induced phase transition method. The PSF/O–MoS 2 nanocomposite was used as a support for the interfacial polymerization between piperazine and tricarbonyl chloride. The pore morphology of the nanocomposites changed dramatically as the O–MoS 2 content increased. With the optimal content of O–MoS 2 in substrates was 0.06 wt%, the pore structure of the substrate changed from a larger irregular bubble pore structure to a finger-like pore structure. The nanocomposite matrix-supported TFC membrane exhibited 1.7 times higher water flux and better salt removal compared to the control membrane. Meanwhile, the obtained nanofiltration membranes showed excellent separation performance in treating simulated rare earth wastewater (P507) containing surfactants with a desalination rate of 97.08%. The desalination rate also reached 95% in a 24- h performance test on real rare earth wastewater (50-fold dilution), demonstrating its great potential for industrial applications. This work also highlights that modification of substrates with functional nanomaterials can provide a versatile approach to enhance the separation performance and stability of TFC membranes.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Ye-Han Pan,Qing-Yang Zhao,Lin Gu,Qing-Yun Wu
Novel thin film nanocomposite (TFN) membranes were fabricated by interfacial polymerization on imogolite nanotubes (INTs) blended substrates for the forward osmosis (FO) desalination . INTs as intrinsically hydrophilic nanotubes were synthesized and characterized to be with length of 100–200 nm, outer diameter of 2 nm, and inner diameter of 1 nm. Then, different INTs loading (0.33, 0.66 and 1.0 wt%) were used to prepare INTs blended polysulfone (PSf) substrates, whose morphology and properties were investigated in detail. It is found that the incorporation of INTs obviously enhanced the hydrophilicity , pure water flux , overall porosity, surface porosity and roughness of PSf substrates. The TFN membranes demonstrated superior water permeance and salt rejection compared to the thin film composite (TFC) membranes. Among others, TFN 0.66 with 0.66 wt% INTs blended PSf substrate showed the best over-all properties which are important for demonstrating good osmotic performance in FO. Moreover, TFN membranes presented smaller structural parameters than TFC membrane, which means that internal concentration polarization (ICP) effect can be alleviated by incorporating hydrophilic INTs into substrates. The obtained TFN membranes with INTs blended substrates could develop opportunities in desalination.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
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IF 6.578
Miao Guo,Shuhao Wang,Kaifeng Gu,Xiaoxiao Song,Yong Zhou,Congjie Gao
Performance enhancement of the TFC membrane depends on the fine design of the functional layer. In this study, a gradient cross-linking strategy has been successfully applied to fabricate an ultra-thin gradient cross-linked PVA (GC-PVA) functional layer with the aid of surfactant on a polysulfone (PSF) support membrane. Such a strategy was accomplished by impregnating the crosslinker (Trimesic acid) on the porous support membrane prior to PVA coating. As confirmed by XPS and EDX studies, the GC-PVA membrane features a gradient cross-linked structure, where the bottom surface is densely cross-linked while the top is only slightly cross-linked. Overall, the lowest thickness achieved by the gradient-crosslinked ultrathin functional layer was 75.4 nm. This strategy significantly improved water flux compared with the conventional fully cross-linked PVA membranes while similar salt rejections can be maintained. In addition, the impact of key fabrication parameters, such as the concentration of PVA, surfactant, crosslinker, and the post-treatment temperature has been systematically studied. The optimized membrane had a significantly high water flux of 72.9 L m −2 h −1 at 0.2 MPa and showed rejection rates of 38.2% and 90.7% towards NaCl, Na 2 SO 4 aqueous solution (500 mg/L), respectively.
研究领域:
材料科学
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膜分离技术
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高分子化学
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纳米功能材料
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环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoya Xu,Chengli Jiao,Xinxin Li,Xiaoqian Zhang,Lun Shu,Ge Su,Minghua Huang,Heqing Jiang
Metal-organic framework (MOF) membranes have emerged as promising candidates for hydrogen separation, but the fabrication of defect-free and flexible MOF membranes is still challenging. Here, we propose a thermally induced in-situ growth strategy to develop flexible membranes consisting of amorphous Zn-2-methylimidazole complex (a-Zn-MeIM) and crystalline zeolitic imidazolate framework-8 (c-ZIF-8) on polysulfone substrate, denoted as amorphous Zn-MeIM/crystalline ZIF-8 (a-Zn-MeIM/c-ZIF-8) membranes. During the thermal treatment of pre-sprayed mixture containing a-Zn-MeIM on the top surface of polysulfone substrate, a-Zn-MeIM is converted to c-ZIF-8. Similar coordination environments featured with Zn 2+ -2-methylimidazolate coordination configurations between flexible a-Zn-MeIM and rigid c-ZIF-8 provides enhanced interfacial compatibility, effectively eliminating cracks and grain boundary defects. Benefitting from both the flexibility of amorphous phase and well-defined pore structure of crystalline phase, the resulting a-Zn-MeIM/c-ZIF-8 membranes show flexibility and preferential diffusion of H 2 molecules. The membrane structure can be modulated by adjusting c-ZIF-8 concentration of sprayed colloid and thermal treatment temperature. The optimized a-Zn-MeIM/c-ZIF-8 3.75 membrane with flexibility exhibits a H 2 /CH 4 mixed separation selectivity up to 96.9 at 90°C. Additionally, a-Zn-MeIM/c-ZIF-8 3.75 membrane with an area of 644 cm 2 has been prepared, promoting the practical applications of MOF membranes with good processability.
研究领域:
材料科学
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化学工程
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膜技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 46
·26159-26171
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IF 12.732
Qiangqiang Song,Yuqing Lin,Takafumi Ueda,Titik Istirokhatun,Qin Shen,Kecheng Guan,Tomohisa Yoshioka,Hideto Matsuyama
In this study, a highly perm-selective thin-film composite (TFC) nanofilm was successfully developed via silicification interlayer-mediated interfacial polymerization. The silicification interlayer, fabricated in situ, significantly improved the surface hydrophilicity of the polysulfone (PSf) substrate and facilitated the high-density uptake of amine monomers. The interlayer also served as a quasi-molecular-scale regulator that decelerated the diffusion of amine monomers into the organic phase to polymerize with the acyl chloride of 1,3,5-benzenetricarbonyl trichloride (TMC). The synergistic effects triggered self-sealing and inhibited the membrane growth, which promoted the formation of ultrathin polyamide (PA) nanofilms (approx. 13 nm) with enhanced crosslinking properties. The best-performing PA_SiO2/PSf membrane exhibited a high water permeance of 14.5 L m−2 h−1 bar−1, which was approximately three times the permeance of the pristine PA membrane (4.8 L m−2 h−1 bar−1). Furthermore, the membrane exhibited a high rejection capability toward divalent salts (98.7% against Na2SO4) and mono/divalent ion selectivity of 60.9. Hence, the newly developed PA_SiO2/PSf membrane exhibits competitive separation properties compared to the state-of-the-art desalination membranes. The technique is applicable to the majority of conventional interfacial polymerizations, which highlights its use in the development of high-performance membranes for water remediation.
研究领域:
材料科学
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膜技术
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水处理
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）