RSC Advances
·
2024
·Vol. 14
·期 33
·24055-24065
·
IF 3.9
Xiuzhen Wei,Zelong Chen,Mengjia He,Liangliang Xu,Yue Li,Jia Yang,Xuekang Zhang,Xianghao Zhang,Ze Wang,Shiyu Cao,Qinghua Zhou,Bingjun Pan
Mg–Fe layered hydroxide (LDH) was synthesized by the double titration method and added to trimesoyl chloride (TMC) to prepare an Mg–Fe LDH-modified polyamide nanofiltration (NF) membrane by interfacial polymerization (IP). Compared to the pure polyamide NF membrane, the Mg–Fe LDH-modified membrane presented a wrinkled structure and a comparatively smooth surface. Additionally, the permeation flux and rejection rate of the modified NF membrane for 1000 mg L−1 Na2SO4 solution were 61.7 L m−2 h−1 and 95.9%, respectively. When the Mg–Fe LDH modified NF membrane was used to separate dye/NaCl mixed solutions, the rejection of NaCl was less than 17% and the rejection rate of Coomassie Brilliant Blue (CBB) molecules was close to 100%. At the same time, the concentration of CBB increased from 500 mg L−1 to 1151 mg L−1 which means that the LDH modified NF membrane could separate CBB/NaCl effectively and could concentrate CBB at the same time.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhongsen Yan,Sufen Lin,Haiqing Chang,Junge Xu,Wenxin Dai,Dan Qu,Heng Liang,Fangshu Qu
Membrane distillation technology, utilized for treating hypersaline wastewater from seawater desalination, often encounters challenges related to inorganic scaling, adversely affecting membrane performance. Herein, we introduce a innovative approach employing a sacrificial layer on the surface of Thin Film Composite (TFC) membranes to concurrently enhance inorganic scaling resistance and facilitate membrane reusability. The sacrificial layer (Fe 3+ -TA) consisted of tannic acid (TA) complexed with iron ions (Fe 3+ ) and could be removed and regenerated in situ. The results demonstrated that the Fe 3+ -TA layer significantly improved the membrane's surface smoothness and densification, maintaining superior anti-scaling performance. The modified membrane exhibited remarkable durability, sustaining six reuse cycles with a flux recovery exceeding 97 % in gypsum scaling tests. Furthermore, the formation of new complexes during gypsum scaling tests confirmed the membrane's augmented scaling retardation capabilities. Thus, integrating of a sacrificial layer into TFC membranes presents a promising strategy for advancing membrane distillation processes in hypersaline wastewater treatment.
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高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Xue Yu-Ren,Liu Chang,Ma Zhao-Yu,Zhu Cheng-Ye,Wu Jian,Liang Hong-Qing,Yang Hao-Cheng,Zhang Chao,Xu Zhi-Kang
It is particularly essential to analyze the complex crosslinked networks within polyamide membranes and their correlation with separation efficiency for the insightful tailoring of desalination membranes. However, using the degree of network crosslinking as a descriptor yields abnormal analytical outcomes and limited correlation with desalination performance due to imperfections in segmentation and calculation methods. Herein, we introduce a more rational parameter, denoted as harmonic amide bond density (HABD), to unravel the relationship between the crosslinked networks of polyamide membranes and their desalination performance. HABD quantifies the number of distinct amide bonds per unit mass of polyamide, based on a comprehensive segmentation of polyamide structure and consistent computational protocols derived from X-ray photoelectron spectroscopy data. Compared to its counterpart, HABD overcomes the limitations and offers a more accurate depiction of the crosslinked networks. Empirical data validate that HABD exhibits the expected correlation with the salt rejection and water permeance of reverse osmosis and nanofiltration polyamide membranes. Notably, HABD is applicable for analyzing complex crosslinked polyamide networks formed by highly functional monomers. By offering a powerful toolbox for systematic analysis of crosslinked polyamide networks, HABD facilitates the development of permselective membranes with enhanced performance in desalination applications.
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Fei Shi,Ye Yuan,Guangyu Xing,Qinghua Li,Yi Yang,Menglong Sheng,Jixiao Wang,Song Zhao,Zhi Wang
Preparing polyamide (PA) composite membranes with high gas separation performance requires rational control for the interfacial polymerization (IP) process. In this study, the monomer supply of piperazine (PIP) and trimesoyl chloride (TMC) in the IP process was precisely manipulated to generate an ultrathin PA film on the polydimethylsiloxane (PDMS) gutter layer for CO 2 separation. Concretely, the PIP supply was regulated from the homogeneous, slow, and excess mode to the inhomogeneous, fast, and small mode by constructing a sodium dodecyl sulfate (SDS) array at the phase interface ; subsequently, the TMC supply was increased by elevating the TMC concentration . Therefore, the amine-to-acid chloride concentration ratio in the reaction zone was optimized and, as a consequence, the IP reaction rate was significantly increased. As a result, the thickness of the PA film was reduced from ∼92 nm to ∼37 nm through the optimization of SDS and TMC concentrations, and accordingly, the CO 2 permeance was increased from 501 GPU to 1498 GPU under 0.1 MPa without sacrificing selectivity. Moreover, the membrane preparation efficiency was greatly improved with an IP reaction time of less than 30 s. The insights provided could promote the industrial application of interfacial polymerization in the scale-up preparation of high-performance CO 2 separation membranes .
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Jing Xia,Zhigao Sun
Carbon dioxide hydrate has a broad application such as the separation and capture of carbon dioxide and cold storage in hydrates. However, its industrial application is limited by the problems of hydrate formation conditions of lower temperature or higher pressure, long induction time, and slow growth rate. Thermodynamic promoters can effectively improve the hydrate formation conditions. Piperazine is selected as a new promoter to investigate the influence on carbon dioxide hydrate dissociation equilibrium conditions in this paper. Compared with pure carbon dioxide forming structure I hydrate, the addition of piperazine forms structure II hydrate, and hydrate dissociation conditions significantly move to lower pressures or higher temperatures. The higher the concentration of piperazine, the better the promoting effect.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yunhuan Chen,Weier Wang,Xinyue Liu,Xiaoxiao Duan,Yongsheng Ren
Highly permselective and antifouling nanofiltration (NF) membranes are desirable materials for ion sieving. Integrating favorable properties through interfacial polymerization (IP) is challenging. Herein, nano-encapsulation of polyethyleneimine (PEI) is performed using a functional group pre-protection approach. By precisely controlling the release process of the nanocapsules during IP reaction to achieve in situ deep cross-linking of PEI. Nanocapsule-modulated IP (NMIP) strategy affects the morphology of polyamide network in several ways, with the Turing structure endowing the membrane with higher water permeance (15.1 L m -2 h −1 bar −1 ) and a narrowed pore size that enhances the ion-sieving properties (Cl - /SO 4 2- selectivity of 68.5). The nearly electroneutral separation layer shows low fouling rates and flux recoveries of up to 97.1 % in the treatment of charged organics and high stability under long-term high-loaded contamination conditions. This study unlocks new avenues for the precise, low-cost fabrication of high-performance ion-sieving materials.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Ruijun Zhang,Qianzhi Sun,Jiayu Tian,Bart Van der Bruggen,Junyong Zhu
Sharpening the pore size distribution is challenging but highly efficacious to boost the performance of polyamide (PA) membranes in nanofiltration (NF). Herein, a facile and applicable strategy for narrowing the pore size distribution of a piperazine (PIP)-based NF membrane is proposed by introducing 1,3-diamino-2-propanol (DAP) into the aqueous phase. The results show that the selective layer can be effectively remodeled via the incorporation of DAP. A thicker, rougher and more hydrophilic selective layer with a narrowed pore size distribution can be attained by adding 0.03 w/v% DAP to the 0.1 w/v% PIP solution, which exhibited a pure water permeance (PWP) of 20.7 L m −2 h −1 ·bar −1 and a MgSO 4 rejection up to 97.4 %. This transformation can be attributed to the stronger polarity and higher reactivity of DAP compared to PIP. During the IP process modified by DAP, the strong polarity of DAP could result in a slower and more homogeneous diffusion of PIP into the organic phase through hydrogen interaction to facilitate a uniform interfacial polymerization reaction. Meanwhile, the higher reactivity of DAP could remedy the probably produced defects. This work provides a straightforward route for the regulation of NF membrane structure and performance.
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高影响因子
FUEL
·
2017
·
IF 4.601
Yannan Li,Jun Cheng,Leiqing Hu,Jianzhong Liu,Junhu Zhou,Kefa Cen
In order to reduce energy consumption of absorbent regeneration, an amine absorbent piperazine (PZ) was dissolved in an organic solvent N , N -dimethylformamide (DMF) to prepare a phase-changing PZ/DMF solution for CO 2 absorption with solid precipitate of PZ-carbamate. The CO 2 absorption capacity and peak rate of PZ/DMF solution were 22.9% and 29% higher than those of PZ/water solution, respectively. Based on differential scanning calorimetry/thermogravimetry experiments, biscarbamate PZ(CO 2 ) 2 2− and protonation PZ(H) 2 2+ compositions (34.5 wt%) in the PZ-carbamate precipitate mainly decomposed at peak temperature of 91.9 °C due to their instability, and then PZ(CO 2 ) composition (65.5 wt%) in the PZ-carbamate precipitate decomposed at peak temperature of 125.7 °C. The electrochemical corrosion tests and scanning electron microscopy revealed that PZ/DMF solution had much lower corrosivity than PZ/water solution.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Bin Wu,Weiyi Fan,Ruochen Wang,Naixin Wang,Yue Shen,Mwema Wanjiya,Yanhui Wu,Quan-Fu An
Organic molecule desalination with nanofiltration has important practical application significance. Zwitterion-based nanofiltration membranes (ZNFMs) with selective channels for monovalent salts have been prepared to improve the separation performance. However, most ZNFMs tend to be restricted by their loose structures, which results in unsatisfactory rejection for small molecules with sub-200 Da molecular weight. In this study, a synchronous modification strategy during the heat treatment of interfacial polymerization was proposed, in which various multi-amine solutions were employed as the novel medium of heat treatment to regulate the structures of ZNFMs. The pore size distribution of membranes could be narrowed to a certain degree through cross-linking by corresponding multi-amines. The optimized ZNFMs exhibited excellent retention to small molecules. For example, the retention of glucose was dramatically increased to 96.5%. Meanwhile, the ZNFMs also had low rejection for monovalent salts, such as KCl (26.7 %). Consequently, the separation factor between glucose and KCl reached 21.2, which demonstrated a great potential for organic molecule desalination with sub-200 Da molecular weight.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Y. Li,Y.J. Zhao,M. Wang,H.Y. Wang
Nanofiltration (NF) is a promising method in lithium extraction from salt lake brine with a high Mg 2+ /Li + mass ratio. However, membrane fouling challenges its applicability and productivity. This study incorporated graphene oxide (GO) into the polyamide (PA) selective layer of NF membranes to enhance anti-fouling properties and improve lithium extraction from brine. Membrane structure analyses revealed that 0.002 wt% and 0.01 wt% GO facilitated the interfacial polymerization reaction. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) results indicated that the PA selective layers in the GO-0.002 % and GO-0.01 % membranes were denser, smoother, and thinner. In contrast, the addition of 0.05 wt% GO resulted in the Turing structures on the membrane surface. Adsorption kinetics indicated pollutant adhesion in the following order: GO-0.05 % > GO-0 % > GO-0.002 % > GO-0.01 %, which was attributed to calcium-carboxyl complexation, as directly measured by AFM and consistent with carboxyl density. The GO-0.002 % and GO-0.01 % NF membranes demonstrated excellent anti-fouling properties in brines, with lower initial fouling rates and higher flux recovery after cleaning, underscoring the significant role of calcium-carboxyl complexation in membrane fouling. The retention of Mg 2+ increased to 95 %, while that of Li + decreased to below −28 % for GO-0.002 % and GO-0.01 % membranes, indicating promising potential for Mg and Li separation. This study provides valuable insights into developing NF membranes with high Mg/Li selectivity and anti-fouling capabilities for lithium extraction from salt lake brine.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhiguo Li,Fangbo Zhao,Hongxu Chen,Liu Yang,Jiaming Zhang
The active layer of the thin film composite (TFC) nanofiltration membrane prepared by traditional interfacial polymerization (IP) was usually a non-homogeneous state with dense in the middle and loose on both sides. Such structure would reduce the stability of membrane in operation. In this paper, a novel electrospray polymerization nanofiltration (EPNF) membrane was fabricated for efficient and long-term stable separation for Mg 2+ /Li + by multiple scan 3D electrospray printing technique. The active layer consisted of two homogeneous separation layers, the piperazine-trimesoyl chloride (PIP-TMC) inner layer and polyethyleneimine based (PEI-TMC) outer layer. With a fixed scan of inner layer, the effect of scan number of PEI-TMC outer layer on the performance of EPNF membrane was analyzed detailly from chemical structure and ion separation performance. Under the synergistic effect of electrostatic repulsion and pore size screening, the EPNF membrane achieved a Mg 2+ /Li + separation factor of 36.28 and only 1.5 % performance loss in the operation of 150 h. The electrospray polymerization process presented unique advantages in preparing TFC nanofiltration membranes with long-term separation stability.
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高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yue Miao,Xiaowen Huo,Yingying Zhao,Xiuling Liu,Haitao Wang,Jun Li,Na Chang
The utilization of surfactants in the fabrication of thin-film composite (TFC) membranes has proven to be an effective way for the regulation of interfacial polymerization (IP) process in order to obtain ideal polyamide (PA) layers. However, the uncontrollable migration of surfactants and the variety in the aggregated state of surfactants result in difficulty in regulation of the morphology of PA layer. Here, nonionic surfactant Span80 is introduced in organic-phase before IP process, and the impact of the transformation of Span80 from single molecules to micelles, as well as the morphology the PA layers is systematically investigated. The function of Span80 in IP process and its impact on improving the uniformity, compactness, and separation performance of the PA layer are demonstrated by molecular simulations. As has been proved that Span80 single molecules or micelles tend to form a surfactant layer composed by Span80 single molecules at the water-organic interface due to the lower interaction energy during their migration from the organic phase to the interface. The formation of this monolayer significantly reduces the water-organic interfacial tension, which promotes the diffusion of piperazine monomer, and accelerates the IP process. As a result, with the increasing Span80 concentration, the morphology of PA layer transforms from granular structure to denser micro-spherical structure. The more uniform PA layer helps to improve the performance of this nanofiltration membrane, with the Li + /Mg 2+ separation ratio increasing from 2.41 to 14.72, representing an approximately 6-fold enhancement in separation efficiency.
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高影响因子
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