DESALINATION
·
2017
·
IF 5.527
Hai-Zhen Zhang,Zhen-Liang Xu,Hao Ding,Yong-Jian Tang
High water permeability and good separation property are greatly desired in water production due to energy concerns. To explore nanofiltration (NF) membrane with high permeability for cations separation, a positively charged NF membrane was fabricated via interfacial polymerization using polyethersulfone (PES) three-channel capillary ultrafiltration (UF) membrane as substrate, polyethyleneimine (PEI) as the aqueous precursor. The NF membrane preparation conditions were optimized. To enhance the permeability of the prepared NF membrane, modified hydroxyl contained multi-walled carbon nanotubes (MWCNTs-OH), grafting with piperazine (PIP), were utilized. The resultant NF membrane showed increased water flux from 20.8 L·m − 2 ·h − 1 to 56.1 L·m − 2 ·h − 1 at 4 bar after adding 0.01 wt% modified MWCNTs-OH in aqueous solution. Interestingly, MgCl 2 rejection of the membrane also increased from 94.2% to 96.9%. The positively charged NF membrane exhibited above 97% rejection for divalent cations (Mg 2 + and Ca 2 + ) and low rejection (< 70%) for monovalent cations (Na + and Li + ), and it also showed long durability and good separation for Mg 2 + and Li + when the membrane was used to separate mixed salts solution simulated the composition of salt lake brine. The fabricated membrane would have potential for effective water softening and for reclamation of lithium from brine or seawater with high Mg 2 + /Li + ratio.
研究领域:
环境科学
·
材料科学
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 1
·016514
·
IF 4.386
Yuandong Liu,Limin Zhang,Jingwen Mo,Yi Zhou,Yang Tian
A Ca2+ selective microelectrode was proposed through electrodepositing graphene oxide (GO) on carbon fiber as an efficient ion-electron transfer layer. The gold leaves were further synthesized at GO surface to increase the specific surface area, and provide a substrate for assembly of the specific ligands for Ca2+. GO with negatively charges greatly facilitated the electron transfer process from the recognition center to electrode surface, resulting in the apparently enhanced sensitivity towards Ca2+. Moreover, the developed ion-selective microelectrode exhibited good selectivity to Ca2+, and a good linear range from 10 μM to 10 mM with a detection limit of 5.91 ± 0.46 μM.
研究领域:
分析化学
·
生物医学工程
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Materials Today Physics
·
2026
·
IF 9.3
Yaoning Bai,Zhonghang Xia,Mingwei Li,Yiwen Zhang,Huiming Ji
In this study, Ba 0.997 Gd 0.003 TiO 3 @(Ni,Mn)Nb 2 O 6 + x wt% CaZrO 3 (x=0.2, 0.3, 0.4, 0.5, 0.6) (BGT@(N,M)NO-CZO) dielectric ceramics with excellent performance are synthesized by a simple solid-state reaction method. The lattice distortion formed by the substitution of A site in the perovskite structure by rare earth Gd 3+ ions enhances the dielectric constant of BaTiO 3 (BT) -based ceramics, while a single “core-shell” structure formed by niobate-coated (Shell-1) BGT improves the temperature stability in the low-temperature range. The dielectric constant of BGT@(N,M)NO ceramic reaches about 4500, and the temperature stability meets X7R. More importantly, for further optimize the dielectric properties, an isovalent co-dopant CaZrO 3 is added to the BGT@(N,M)NO ceramic to enhance high temperature stability. In different regions of BT matrix, Zr 4+ replaces Ti 4+ at the B site in the region between the Shell-1 and the core phase to form Shell-2, while Ca 2+ replaces Ba 2+ at the A site mainly in the core phase. Moreover, the double “core-shell” structure BGT@(N,M)NO-CZO ceramics generate internal stress and strong interionic interactions in lattice, leading to a shift in the Curie temperature toward higher temperatures, which enhances the temperature stability of BT-based ceramics between 145 °C to 155 °C range. Therefore, BGT@(N,M)NO-CZO (0.3 wt%) ceramic maintains high dielectric constant (ε r =4852) while extending temperature stability to X8R. Additionally, the dielectric loss of BGT@(N,M)NO-CZO (0.3 wt%) ceramic is reduced to 0.98%, and the room temperature resistivity and breakdown strength are reached 10 10 Ω·m and 89.1 kV/cm, respectively. The DFT calculation results further indicate that high dielectric constant and wide temperature stability correspond Gd 3+ -doped BT and (Zr 4+ , Ca 2+ ) isovalent co-doped BT. Ultimately, the double “core-shell” structure BGT@(N,M)NO-CZO ceramics with excellent dielectric properties are obtained via isovalent co-doping effect, rare earth ion doping effect and “core-shell” effect, which further expands the application of BT-based ceramics in the fields of electronic material and device.
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Theranostics
·
2026
·Vol. 16
·期 8
·4283
·
IF 13.3
Yangyang Qu,Yifeng Shang,Shixing Luo,Xiaomin Pei,Yuanming Xiao,Jinmin Zhao,Li Zheng,Chuanan Liao,Ruiming Liang
Rationale: Bone defects pose a persistent challenge in orthopedic medicine due to their limited self-repair capacity. Although guided bone regeneration scaffolds have shown therapeutic potential, their clinical efficacy remains constrained by their suboptimal osteoinductive capability. Methods: Herein, we developed biodegradable piezoelectric polyhydroxybutyrate-barium titanate (PHB-BT) nanofiber scaffolds capable of generating synergistic piezoelectric stimulation for bone repair when integrated with low-intensity pulsed ultrasound (LIPUS). Results: Compared with conventional PHB scaffolds, PHB-BT nanofiber scaffolds showed enhanced piezoelectric properties and excellent biocompatibility, thereby facilitating sustained osteogenic activity. In vitro studies revealed that these scaffolds significantly promoted the osteogenic differentiation of bone marrow mesenchymal stem cells under LIPUS stimulation. Notably, in vivo evaluations demonstrated that these scaffolds substantially accelerated bone defect repair, with complete scaffold degradation observed after eight weeks. Mechanistically, PHB-BT nanofibers improved osteogenesis via activating the Ca 2+ /calcineurin/nuclear factor of activated T-cells signaling pathway in response to ultrasound stimulation. Conclusions: These findings have significant implications for the design of next-generation, implantable electrical stimulators capable of providing sustained electromechanical cues for personalized bone tissue engineering applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Khin Nyein Ei San,Tian Niu,Yun Fang,Hong Wang,Ye Fan,Yongmei Xia
Adsorption of fatty acids and soaps on solid surfaces is widely-used to modify solids but easy to be desorbed and forming soap scum in acidic and hard water. The admicelle of sodium conjugated linoleate (ASCL) on nano-CaCO 3 was applied to fabricate stable ASCL@CaCO 3 , via SCL bilayer adsorption followed by simple thermo-curing the conjugated double bonds of SCL within an admicelle to anchor the admicelle around a nano-CaCO 3 core. The structure, morphology, and properties of ASCL@CaCO 3 were characterized by FT-IR, UV, TG, TEM, and contact angle measurements. High internal phase Pickering emulsions of liquid paraffin in water with oil volume fractions up to 80% could be stabilized with 1 wt% of the ASCL@CaCO 3 as particle emulsifier . The stable SCL bilayer on the CaCO 3 surface brings variable surface affinity in response to Ca 2+ /pH/CO 2 triple triggers, endowing the ASCL@CaCO 3 to stabilize high internal phase emulsions, switch on/off Pickering emulsions, and even lead to emulsion inversion. Therefore, the triple stimuli-responsive properties of the ASCL@CaCO 3 can be effectively applied in emulsion preparation–separation and drug delivery systems.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Jianmao Zheng,Jiyuan Zuo,Cairong Xiao,Qining Guo,Xiaobin Fu,Chengyun Ning,Peng Yu
The induction of dental pulp stem cells (DPSCs) into odontogenic differentiation is a cutting-edge method of dental pulp regeneration treatment. However, it remains a challenge to develop biomaterials and therapies that can induce odontogenic differentiation. Here, we propose a wireless electrical stimulation strategy to induce DPSCs odontogenic differentiation via K 0.5 Na 0.5 NbO 3 piezoelectric nanoparticles (KNN) and polarized KNN (PKNN), which can be endocytosed by DPSCs. In vitro, several odontogenic differentiation indexes were also increased in DPSCs treated with KNN and PKNN, and the increase was more obvious in the PKNN group. Intracellular wireless electrical field promoted mitochondrial calcium concentration via mitochondrial calcium unidirectional transporter (MCU), increased the production of adenosine triphosphate (ATP), and induced odontogenic differentiation through the activation of the cAMP-PKA signaling pathway. In vivo, dental pulp-like tissue was induced by electrical stimulation wirelessly with KNN and PKNN, which was more clinically friendly compared with the wired device, and the induction was more obvious in the PKNN group consistent with in vitro experiments. In conclusion, this work demonstrates the potential of PKNN as an effective stimulus that can induce odontogenic differentiation of DPSCs and be applied to dental pulp regeneration treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qianqian Tang,Hao Wu,Mingsong Zhou,Dongjie Yang
Presently, most studies on modified lignin focused on the adsorption to heavy metal cations, but rarely to Ca 2+ in hard water . Therefore, this work prepared a new gel-type lignin-based cationic adsorption resin (E-LSAF) through the crosslinking and curing of alkali lignin grafted by sodium sulfite sulfonated acetone to remove Ca 2+ in water. Under the determined optimum synthesis conditions, E-LSAF with a highest sulfonic group content of 1.99 mmol/g was obtained. Structural and physicochemical measuring results showed E-LSAF was a gel-type resin, owning strong hydrophilicity , high mechanical strength, excellent thermal stability and acid-alkaline resistance. Adsorption results indicated the adsorption of E-LSAF to Ca 2+ was well-fitted by Langmuir model, and the maximum adsorption capacity reached 45.8 mg/g. Pseudo-second-order model can describe this adsorption process well, suggesting it a chemisorption process. Dynamic column adsorption results showed E-LSAF could transform hard water into soft or even very soft water. The regeneration efficiency still maintained 80 % after 5 cycles. The adsorption mechanism was attributed to electrostatic attraction, ion exchange and complexation. This work provided a high-performance lignin-based cationic adsorption material with high adsorption capacity to Ca 2+ and excellent acid-alkaline resistance, which filled the research gap of using modified sulfonated lignin to remove Ca 2+ from water.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 20
·47539
·
IF 2.188
Ruiyang Chen,Shibin Wang,Xin Shen,Feng Zhao,Jianchun Guo
Ca 2+ tolerance of water-soluble polyacrylamide is a key problem in application fields. It is urgent to make the mechanism of between the polyacrylamide and Ca 2+ clear. A terpolymer polyacrylamides including the sulfonate group with different monomer concentrations is synthesized. The effect of the CaCl 2 concentration on the rheological properties is measured by a rheological rheometer. The zeta potential of the copolymer solution is obtained by a zeta potentiometer to learn about the electrical characteristics of the copolymers in solution. The microcosmic shape of the copolymer aqueous solution is investigated by a laser particle analyzer and an environmental scanning electron microscope. The results show that more sulfonate groups on the molecule can enhance the salt tolerance of the polyacrylamide. Sulfonate groups can weaken the effect of Ca 2+ on the copolymer through the formation of complexes, whereas the self-aggregation process of the copolymer cannot be stopped at high Ca 2+ concentrations. This study provides theoretical guidance to elucidate the influencing rules and mechanism of calcium salt on the polyacrylamide containing a sulfonate group, which can be helpful for polyacrylamide modification and can improve the application of polyacrylamide under the condition of higher salt concentration. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47539.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 8
·2229-2238
·
IF 3.146
He Lei,Dai Yong,Wang Zhe,Yang Lutao,Zhang Luxia,Hu Pengpeng,Tian Yu,Mo Hong,Zhu Haomiao,Zhang Jun
Oilfield wastewater has a significantly negative influence on the recovery efficiency due to its hypersalinity. Therefore, magnetic graphene oxide (GO) modified with ethylene diamine tetraacetic acid (EDTA) and grafted by polyethylene glycol (PEG) nano-adsorbent was prepared to remove the Ca 2+ and Cr 6+ in Jidong Oilfield wastewater specifically. It was noteworthy that PEG- g -EDTA/Fe 3 O 4 /GO nano-adsorbent had excellent adsorption performance, with removal ratios up to 71.6% for Ca 2+ and 42.7% for Cr 6+ at 30 min. After the fifth recycling run, the nano-adsorbent still remained with high removal ratios (69.3% for Ca 2+ and 30.5% for Cr 6+ ) and high reuse rates (89.4% for Ca 2+ and 95.2% for Cr 6+ ), indicating that the nano-adsorbent had outstanding adsorption-desorption efficacy and high reusability. The adsorption test results demonstrated that the total salinity of the treated oilfield wastewater decreased by about 5,000 ppm, and the displacement efficiency further increased by 12.5% by chemical flooding compared with the untreated wastewater. Therefore, PEG- g -EDTA/Fe 3 O 4 /GO nano-adsorbent is an adsorbent with excellent potential which can effectively remove Ca 2+ and Cr 6+ in oilfield wastewater to enhance oil recovery (EOR).
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NEUROCHEMICAL RESEARCH
·
2021
·Vol. 47
·期 2
·264-278
·
IF 3.996
Gao Tianyu,Gao Ce,Liu Zhidong,Wang Yun,Jia Xiaoxia,Tian Hao,Lu Qian,Guo Lin
Further understanding the mechanism for microglia activation is necessary for developing novel anti-inflammatory strategies. Our previous study found that the activation of sigma-1 receptor can effectively inhibit the neuroinflammation, independent of the canonical mechanisms, such as NF-κB, JNK and ERK inflammatory pathways. Thus, it is reasonable that an un-identified, non-canonical pathway contributes to the activation of microglia. In the present study, we found that a sigma-1 receptor agonist of 2-morpholin-4-ylethyl 1-phenylcyclohexane-1-carboxylate (PRE-084) suppressed lipopolysaccharide (LPS) elevated nitric oxide (NO) content in BV-2 microglia culture supernatant and LPS-raised mRNA levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), inducible nitric oxide synthase (iNOS) in BV-2 microglia. Moreover, PRE-084 alleviated LPS-increased Ser 9 de-phosphorylation of glycogen synthase kinase-3 beta (GSK-3β), LPS-elevated catalytic activity of calcineurin, and LPS-raised percent and frequency of Ca 2+ oscillatory BV-2 cells. We further found that the inhibitory effect of PRE-084 was reversed by a calcineurin activator of chlorogenic acid and a GSK-3β activator of pyrvinium. Moreover, an IP 3 receptor inhibitor of 2-aminoethoxydiphenyl borate mimicked the anti-inflammatory activity of PRE-084. Thus, we identified a noncanonical pro-neuroinflammary pathway of Ca 2+ oscillation/Calcineurin/GSK-3β and the inhibition of this pathway is necessary for the anti-inflammatory activity of sigma-1 receptor activation.
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Materials
·
2020
·Vol. 13
·期 19
·4403
·
IF 3.057
Zhen Liu,Xinshu Xia,Wei Li,Liren Xiao,Xiaoli Sun,Fubin Luo,Qinghua Chen,Qingrong Qian
The work reports a novel strategy for combining polymers and metal–organic frameworks (MOFs) into composites for adsorption applications. Calcium silicate (CaSiO3) was introduced into acrylonitrile butadiene styrene/thermoplastic polyurethane (ABS/TPU) alloy, and the CaSiO3/ABS/TPU skeleton was fabricated by 3D printing technology. The Ca-MOF was directly loaded on the surface of acetone-etched 3D skeleton by in-situ growth method. The obtained 3D skeleton was characterized and the performance of methylene blue (MB) adsorption was determined. It is clear that Ca-MOF is successfully loaded on the surface of 3D skeleton due to the presence of CaSiO3. The MB adsorption ratios of the solutions with initial concentrations of 50, 100 and 200 mg/L at the equilibrium time (5 h) are 88%, 88% and 80%, respectively, revealing good MB adsorption performance of the 3D skeleton. The MB adsorption ratio remains 70% at six runs of adsorption–desorption experiment, indicating the excellent recovering property of the skeleton. The results show that the prepared CaSiO3/ABS/TPU 3D skeleton is a candidate adsorbent for printing and dyeing effluent treatment.Keywords:3D printing;metal–organic framework;in-situ growth;adsorption;methylene blue
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Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 4
·1403-1411
·
IF 8.867
Junwei Yang,Haian Xie,Hao Chen,Zhuqun Shi,Tao Wu,Quanling Yang,Chuanxi Xiong
Flexible and eco-friendly dielectric materials with high energy density and breakdown strength have promising applications in energy storage devices. Here, cellulose nanofibril/boron nitride nanosheet nanocomposite films were fabricated from 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofibrils (TOCNs) and hexagonal boron nitride nanosheets (BNNSs) in aqueous dispersions. The obtained TOCN/BNNS nanocomposites were further cross-linked by immersion in aqueous CaCl2 solution to improve their properties. The maximum discharged energy density of the finally prepared composite film was 3.9 J cm−3 with only 4 vol% of BNNSs at 380 MV m−1, achieving greater enhancement than the neat TOCN film with a low energy density of 0.1 J cm−3 at 50 MV m−1. It is much higher than the previously reported highest energy density of biopolymer-based composites (0.81 J cm−3) and also higher than that of the commercially available best dielectric polymer BOPP (2 J cm−3). Moreover, the nanocomposite films exhibited excellent mechanical flexibility and significantly improved thermal stability (100 °C increase in thermal decomposition temperature).
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