ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Lei Ge,Jiaqi Li,Gaojing Du,Kai Sheng,Jingwei Hou,Binyu Zhou,Yatao Zhang,Bart Van der Bruggen,Junyong Zhu
Microporous membranes featuring 3D nanochannels present a compelling avenue for energy-efficient liquid separations, attributable to their tunable interconnected through-pore structures. However, the rational design of 3D-nanochannel membranes that simultaneously achieve high permeance and selectivity remains a challenge, arising from the scarcity of appropriate molecular building blocks and the reliance on empirical synthetic methods. Herein, an innovative 3D polyacylhydrazone (PAH) membrane with unique pore-interconnected structures is constructed on a porous hydrogel using contorted tetrahedral aldehydes (TFS) monomers via an in situ interface-confined strategy. Manipulation of side alkyl chain lengths within terephthalohydrazide (TPH) derivates enabled the enhancement of microporosity and tunable pore environment of PAH nanofilms. Molecular dynamics simulations revealed that TPH EO linkers with higher reactivity and moderate steric hindrance facilitate superior pore interconnectivity and sharpened pore size distributions. The resulting PAH membranes achieved exceptional methanol permeances of 10.1 L m −2 h −1 bar −1 and small molecular weight cut-offs of 310 Da, outperforming the state-of-the-art polyamide membranes. This further translated into an outstanding capability in the fractionation of active pharmaceutical ingredients within organic solvent systems. This work demonstrates the efficacy of rational molecular design in developing high-microporosity membranes with tailored interconnected nanochannels, underscoring the potential of 3D microporous membranes for accurate molecular separations.
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DESALINATION
·
2024
·
IF 8.3
Lin Yu,Aida Aibulatova,Zhen-Liang Xu,Li Li,Changqing Hao,Rui Jia,Yin-Xin Fang,Yan Zheng,Yong-Jian Tang
Covalent Organic Framework Materials (COFs) nanofiltration (NF) membranes have extensive applications in the field of separation. In this work, high performance TpPa COFs NF membranes were prepared with catalyst pre-diffused strategy. The catalyst pre-diffused method can let catalyst attached to the membrane surface, which can promote the formation of intermediates first, and then form a complete COFs separator layer in 30 min. The optimized membrane possesses an excellent performance of CR permeability of 97.57 L⋅m −2 ⋅h −1 ⋅bar −1 with a rejection of 99.25 % for CR. The dye/salt separation selectivity α was up to 480.16 (EB-T/NaCl). This markedly decreases the reaction duration for membrane production and enhances preparation efficiency. Consequently, the catalyst pre-diffusion strategy offers an innovative approach for the fabrication of COFs nanofiltration membranes.
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PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2025
·
IF 4
Tengfei Liu,Jianguo Niu,Yuying Gao,Xuan Liu,Jianya Su
Flonicamid is an insecticide with a unique mode of action, primarily inhibiting the feeding behavior of sap-sucking insects. However, its molecular target remains controversial. Reports indicate that both flonicamid and pymetrozine affect insect behavior and mobility. To investigate further, we compared the susceptibility of three insect species ( Myzus persicae , Nilaparvata lugens , and Drosophila melanogaster ) to flonicamid and pymetrozine under two different feeding postures. Results showed that feeding posture did not affect the survival curves or mean lifespans of the three insects. However, insect lifespans were significantly reduced under exposure to either insecticide compared to untreated controls. The effects of the two insecticides on susceptibility and lifespan under different feeding postures were markedly different: feeding posture significantly influenced the sensitivity of aphids, planthoppers, and fruit flies to pymetrozine but had minimal effects on the sensitivity of aphids and planthoppers to flonicamid. Flonicamid had only a minor impact on fruit flies' sensitivity. Survival curve analysis also revealed significant differences under pymetrozine stress, while no such differences were observed under flonicamid stress. These findings indicate that flonicamid exerts different toxicological effects on target insects (aphids and planthoppers) versus non-target insects (fruit flies), depending on feeding posture. This suggests that the toxicological mechanisms of flonicamid differ substantially between target and non-target organisms, with implications that findings in non-target insects may not directly apply to target pests. Our study provides valuable insights and directions for further research into flonicamid's mode of action, aiding in elucidating its underlying mechanisms.
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AICHE JOURNAL
·
2024
·
IF 3.5
Ruilong Li,Yongjian Yang,Jingjing Chen,Chongchong Chen,Wenpeng Li,Xiaoli Wu,Jingtao Wang
Porous membranes, a type of material widely used in nanofiltration, are confronted with the limitation that the influence of channel–molecule interactions on transport behaviors has yet been investigated in detail. Herein, covalent organic framework membranes with adjustable pore sizes (⁓ 2.5 nm and ⁓ 1.2 nm) and chemical groups (−F, −OH, and −CO−) were prepared by interfacial polymerization. We demonstrate that strong channel–molecule attraction induces the formation of stable solvent layers along nanochannel walls, which protect central molecules from the attraction of chemical groups. Significantly, stable solvent layers permit fast transport of ethanol (245.6 L m −2 h −1 bar −1 ) with reactive black (RB) rejection of 96%. Likely, for membranes with weak channel–molecule attraction, no solvent layers are formed and molecules also transport smoothly. Interestingly, membranes that exhibit moderate channel–molecule attraction exert metastable solvent layers, thus displaying high transport resistance. This hindrance effect on molecule transport becomes more pronounced in smaller nanochannels.
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Environmental Science-Water Research & Technology
·
2024
·Vol. 10
·期 8
·1871-1880
·
IF 3.5
Yujie Zang,Linlin Yan,Tieying Yang,Kai Wang,Yingjie Zhang,Enrico Drioli,Jun Ma,Yonggang Li,Shanshan Ji,Xiquan Cheng
Membrane separation technology has been recognized as an effective approach to remove dyes from dyeing wastewater that are crucial for improving the quality of the pigmentation effect in the printing and dyeing industry. However, the trade-off between membrane permeability and selectivity is an inherent drawback of molecular separation membranes, which hampers the development of large-scale applications of the membrane separation process. In this work, we provide a facile approach to construct a highly selective polyamide (PA) layer on a ceramic membrane through the interfacial polymerization of branched polyethylenimine (PEI) and trimesoyl chloride (TMC) for the selective separation of dyes and salts from wastewater. With high positive surface zeta-potential (100 mV) and excellent hydrophilicity, the PA/ceramic composite membranes exhibit ultra-high solution permeance (496.4 L m−2 h−1 bar−1) while treating simulated dye/salt aqueous solutions containing 40 ppm Congo red (CR) and 1 g L−1 NaCl, which is 30 times higher compared with commercial polyamide nanofiltration membranes. Interestingly, the separation factor of NaCl to CR of the PA/ceramic composite membranes reaches above 980, which is far superior to the state-of-the-art nanofiltration membranes reported recently. Moreover, PA/ceramic membranes possess a relatively ideal long-term stability, with their permeance remaining at 280 L m−2 h−1 bar−1 after 10 h of testing. Taken together, the PA/ceramic composite membranes are highly promising for dye desalination and purification.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jisuan Tan,Yuxin Xu,Qin Deng,Yingmei Li,Yanzhen Yin,Xingtang Liang,Yong Luo
This study investigated the transformation of an agricultural byproduct, pomelo peel, into an environmental purifier by crosslinking assisted surface amination process and its use in wastewater treatment application. Surface morphology and textural analysis showed that the functionalized surface-amidated pomelo peel (SA-PP) attained a lamellar structure with an average pore size of 6.52 nm and a specific surface area of 7.82 m² g −1 . Zeta potential measurements confirmed that SA-PP exhibits a positive surface charge within a pH range of 3–11. This surface characteristic facilitated the effective adsorption of anionic dyes by SA-PP, including amaranth red ( Q e = 497.15 mg g −1 ), methyl orange ( Q e = 247.93 mg g −1 ), bright blue ( Q e = 231.53 mg g −1 ), and lemon yellow ( Q e = 116.77 mg g −1 ), as well as heavy metal ions like hexavalent chromium (Cr(VI), Q e = 193.17 mg g −1 ). Further investigations on the adsorption of amaranth red and Cr(VI) indicated that SA-PP achieved equilibrium after 30 min. The process followed the pseudo-second-order and Langmuir isotherm models, indicating monolayer adsorption. The adsorption efficacy of SA-PP remained consistent across a wide range of pH levels. After five cycles, SA-PP was able to retain more than 60 % of its adsorption capacity, highlighting its potential as a sustainable, cost-effective, non-toxic, and biodegradable adsorbent for wastewater treatment applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2011
·
IF 2.775
Xiao-Lin Li,Li-Ping Zhu,Bao-Ku Zhu,You-Yi Xu
It is well-known that cellulose is difficult to dissolve in common organic solvent and be directly processed into porous membrane. In this work, using ionic liquid, 1-allyl-3-methylimidazolium chloride (AMIMCl) as solvent, high flux and anti-fouling cellulose nanofiltration (NF) membranes were fabricated by phase inversion method from 8.0 wt.% of cellulose/AMIMCl solutions. Pure water was employed as the non-solvent in phase inversion process. From the result of polarized light microscopy, we found that cellulose was completely dissolved in the AMIMCl at 90 °C. The characterizations of Fourier transform infrared (FTIR) and X-ray diffraction (XRD) spectroscopies showed that no obvious changes occurred in the chemical structure of cellulose after membrane formation, but the crystallinity had a remarkable decreased. Membrane morphologies of the fabricated cellulose membranes including the cross-section and the surface were analyzed by scanning electron microscopy (SEM). It was found that the AMIMCl had a distinctive effect on phase inversion process and the cellulose selective layer displayed a macrovoid-free and relatively dense layered structure. Based on the filtration experimental results, the pure water permeation flux of the membranes reached 128.5 L/m 2 h under 0.4 MPa, and the molecular weight cut-off was less than 700 Da. The membranes exhibited a good stability and anti-fouling ability in water-phase separation process, and were suitable as NF membranes to separate the organic compounds with a medium molecular weight.
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IEEE Robotics and Automation Letters
·
2024
·Vol. 9
·期 12
·11802-11809
·
IF 4.6
Ruomao Liu,Yujun Chen,Yin Zhen,Jiachen Zhang
Capsule medicine is one of the most widely used methods of drug delivery into the human digestive tract. Packaging drugs into capsules not only prevents contamination of the drug before reaching the destination, but also protects the digestive organs and respiratory tract from potential damages caused by drug reactions. After reaching the targeted digestive organs, the drugs in the orally taken capsules usually can only be released passively. Most capsule robots that have been proposed to release drugs actively did not consider the compressed pressure when they pass through the esophagus, which could lead to premature drug release. This letter proposes a magnetic capsule robot that can withstand intra-esophageal pressure and also has the advantages of active locomotion and on-demand drug releasing. The proposed robot consists of two permanent magnets, an exoskeleton, and a soft non-magnetic container. Thus, it can withstand intra-esophageal pressure when it passes through the esophagus. This capsule robot can enter the stomach for targeted drug releasing without leaking liquid drugs along the path. The behavior of the robot is controllable using an external magnetic field thanks to the ring-shaped magnets mounted on the robot's top and bottom sections. The non-magnetic drug container will not be influenced by the external magnetic field during the locomotion to prevent leakage. The experiments show that this proposed capsule robot is more relevant to real-world medical applications thanks to its unique capability to withstand esophageal pressure.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2011
·Vol. 30
·期 2
·152-163
·
IF 0.478
Li Xiao-lin,Zhu Li-ping,Jiang Jin-hong,Yi Zhuan,Zhu Bao-ku,Xu You-yi
Inspired by the self-polymerization and strong adhesion characteristics of dopamine in aqueous conditions, a novel hydrophilic nanofiltration (NF) membrane was fabricated by simply dipping polysulfone (PSf) ultrafiltration (UF) substrate in dopamine solution. The changes in surface chemical composition and morphology of membranes were determined by Fourier transform infrared spectroscopy (FTIR-ATR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The experimental results indicated that the self-polymerized dopamine formed an ultrathin and defect-free barrier layer on the PSf UF membrane. The surface hydrophilicity of membranes was evaluated through water contact angle measurements. It was found that membrane hydrophilicity was significantly improved after coating a polydopamine (pDA) layer, especially after double coating. The dyes filtration experiments showed that the double-coated membranes were able to reject completely the dyes of brilliant blue, congo red and methyl orange with a pure water flux of 83.7 L/(m 2 ·h) under 0.6 MPa. The zeta potential determination revealed the positively-charged characteristics of PSf/pDA composite membrane in NF process. The salt rejection of the membranes was characterized by 0.01 mmol/L of salts filtration experiment. It was demonstrated that the salts rejections followed the sequence: NaCl < Na 2 SO 4 < MgSO 4 < MgCl 2 < CaCl 2 , and the rejection to CaCl 2 reached 68.7%. Moreover, the composite NF membranes showed a good stability in water-phase filtration process.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guiliang Li,Yang Liu,Zhaoyi He,Ke Shi,Fu Liu
Covalent organic frameworks (COF) membranes are considered as promising candidates for organic solvent nanofiltration (OSN) due to their well-defined porosity, high perm-selectivity, and exceptional resistance to solvents. However, irreversible membrane fouling caused by filter cake layers or pore clogging challenges the robust separation over long-term operation especially for well-known COF membranes. Here, we present novel ultrafast covalent triazine frameworks (CTF) membranes with retrievable separation performances for OSN processes. CTF-1 membrane with unitary nanopore and CTF-m membrane with binary nanopore are fabricated via an air-organic solvent interfacial polymerization technique for comparison, which demonstrates molecular-level selectivity (MWCO, ∼320 Da for CTF-1 and ∼ 625 Da for CTF-m) and ultrafast permeability for polar organic solvents. Moreover, the heterogeneous skeleton nanopores structure of CTF-m membranes facilitates efficient separation of photogenerated carriers, thus resulting in retrievable permselectivity. This work offers an efficient strategy via Donor-Acceptor structure modulation to tackle OSN membrane fouling, paving the way for applications of framework membranes.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-9
·
IF 5.3
Guo Dongying,Yang Hailiang,Zhang Longyue,Dai Ruoyu,Huang Yuankui,Hu Yaoping
Specific assay for methylene blue (MB) in aquaculture is critically required to assess the safety of ecosystems and aquatic products. In this work, a facile method is demonstrated for ratiometric fluorescence determination of MB based on blue/red dual emissive carbon dots (b/r-CDs). b/r-CDs, derived from the leaves of Impatiens balsamina, show weak and strong emission peaks at 432 and 672 nm, respectively, and possess a high photoluminescence quantum yield of 35.7%. The red fluorescence of b/r-CDs at 672 nm, serving as the response signal, can be significantly quenched by MB due to the mechanism of inner filter effect, while the blue fluorescence at 432 nm is insensitive to MB, thus acting as the background reference. With addition of an increased amount of MB, the fluorescence color of b/r-CDs gradually changes from red to blue, which realizes the visual detection. The linear range and limit of detection are measured to be 0.05–10 μM and 15 nM, respectively. Notably, a portable smartphone sensing platform is built for quantitative detection of MB by analyzing the RGB values. Moreover, the practical applications of b/r-CDs for monitoring MB in real water and aquatic products using both fluorescence spectrophotometer and smartphone achieve satisfactory results. Graphical
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Jie Shi,Mingquan Huang,Qiang Yang,Yin Xu,Jihong Wu,Hongqin Liu,Jinglin Zhang,Fuping Zheng,Wei Dong
A new convenient method for identifying colorant compounds (CCs) in food matrices was developed using high-performance liquid chromatography with a diode array detector and quadrupole-time-of-flight mass spectrometer (HPLC-DAD-Q/TOF-MS) combined with theoretical calculations. A model sample containing three typical CCs was completely separated via HPLC-DAD. The obtained 3D ultraviolet-visible (UV–vis) spectra revealed the maximum absorption wavelengths (MAWs) of all CCs (yellow, 430 nm; red, 520 nm; blue, 620 nm) in the range of 400–800 nm, and their colors were determined based on their MAWs. Temporary structures of the CCs were obtained using Q/TOF-MS analysis. Theoretical calculations were then performed to obtain the theoretical MAWs and colors of the CCs according to their calculated UV–vis spectra based on temporary structures. The structures of the CCs were confirmed without the need for authoritative standards by comparing the consistency between their experimental and theoretical MAWs and colors. This method is particularly suitable for identifying CCs or compounds with UV–Vis absorption, including new compounds, compounds for which standards are difficult to obtain, and known compounds without reporting relevant molecular information.
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危险品化学品经营许可证（带存储）