查找使用阿拉丁产品的科研文献

Ultrathin organic solvent nanofiltration membrane with polydopamine-HKUST-1 interlayer for organic solvent separation

Haike Li,Xindong Li,Guozai Ouyang,Lijinhong Huang,Lang Li,Wenhao Li,Wanfu Huang,Duokun Li

Polydopamine (PDA) and metal-organic skeleton HKUST-1 were co-deposited on the base membrane of hexamethylenediamine (HDA)-crosslinked polyetherimide (PEI) ultrafiltration membrane as the interlayer, and high-throughput organic solvent nanofiltration membrane (OSN) was prepared by interfacial polymerization and solvent activation reaction. The polyamide (PA) layer surface roughness from 28.4 nm in PA/PEI to 78.3 nm in PA/PDA-HKUST-1 0.6 /PEI membrane, reduced the thickness of the separation layer from 79 to 14 nm, and significantly improved the hydrophilic, thermal and mechanical properties. The flux of the PA/PDA-HKUST-1 0.6 /PEI membrane in a 0.1 g/L Congo red (CR) ethanol solution at 0.6 MPa test pressure reached 21.8 L/(m 2 ·hr) and the rejection of CR was 92.8%. Solvent adsorption test, N, N-dimethylformamide (DMF) immersion experiment, and long-term operation test in ethanol showed that the membranes had high solvent tolerance. The solvent flux test demonstrated that, under the test pressure of 0.6 MPa, the flux of different solvents ranked as follows: methanol (56.9 L/(m 2 ·hr)) > DMF (39.6 L/(m 2 ·hr)) > ethanol (31.2 L/(m 2 ·hr)) > IPA (4.5 L/(m 2 ·hr)) > N - hexane (1.9 L/(m 2 ·hr)). The ability of the membranes to retain dyes in IPA/water dyes solution was also evaluated. The flux of the membrane was 30.4 L/(m 2 ·hr) and the rejection of CR was 91.6% when the IPA concentration reached 50%. This OSN membrane-making strategy is economical, environment-friendly and efficient, and has a great application prospect in organic solvent separation systems.

SrMn1-xFexO3-δ (x = 0–1) black ceramic pigment: Synthesis, color properties, and application

Fanbing Lai,Wei Shi,Shuyun Hu,Xiaohong Li,Qibing Chang,Yongqing Wang,Qikun Wang

In this work, SrMn 1- x Fe x O 3- δ ( x  = 0–1) black ceramic pigments were synthesized by the solid-state method. The research explores the influence of calcination temperature and iron ion doping on the color properties of the pigments. Furthermore, the potential applications of SrMn 1- x Fe x O 3- δ pigments in ceramic glaze and heat-absorbing materials are also discussed. The findings reveal that the synthesized SrMnO 3 pigment exhibits the lowest L* -value (22.30) at 1100 °C, although it displays a slight blue hue. To optimize the color properties of the SrMnO 3 pigment, iron ion doping is employed. When the doping level of iron ions is 50 mol.% (i.e., x  = 0.5), the L* -value of the SrMn 0.5 Fe 0.5 O 3- δ pigment calcined at 1000 °C significantly decreases to 19.77, while the a* - and b* -values approach 0, resulting in a pure black color. This is attributed to the high surface roughness , low band gap energy, and substantial oxygen vacancies present in the SrMn 0.5 Fe 0.5 O 3- δ pigment. The tinting mechanism of the SrMn 1- x Fe x O 3- δ pigment in the ceramic glaze is classified as "ion tinting", wherein the glaze color relies on the concentrations of Mn and Fe ions. When the pigment content reaches 36 wt%, the L* -value of the glaze drops to 4.94, showing a deep black shade. Additionally, the SrMn 0.5 Fe 0.5 O 3- δ pigment exhibits excellent sunlight absorption capabilities, with a near-infrared reflectance ( R *) of only 5.04%. This research presents a black ceramic pigment with various advantages, such as simplified processing, affordability, environmental friendliness, and exceptional color performance.

Sustainable production of clean water: 1 T-MoS2/PDA composite enhanced the photothermal conversion

Hankui Sang,Congming Tang,Kai Ma,Xinli Li

The scarcity of fresh water resources necessitates us to develop an efficient technique for sustainable production of clean water from seawater and wastewater. Here, we constructed the 1 T-MoS 2 /PDA (polyaniline) as a photothermal material for purification of seawater and wastewater to produce clean water through interfacial evaporation by virtue of sunlight. 1 T-MoS 2 has a higher evaporation capacity of water than 2 H-MoS 2 , which was selected to prepare 1 T-MoS 2 /PDA composite for photothermal conversion. As expected, 1 T-MoS 2 /PDA composite offers a higher evaporation rate of water than both 1 T-MoS 2 and PDA , which owes to an excellent light absorbance, low light reflectance and good wettability . Under irradiation of 1 sun, the evaporation rate of water over the 1 T-MoS 2 /PDA composite in pure water reached 1.51 kg m −2 h −1 , and the photothermal conversion efficiency reached 92%. Encouragingly, 1 T-MoS 2 /PDA composite can be well used to treat real seawater and various wastewater such as organic dye solution and heavy metal ion solution, in which the evaporation rate of water is close to pure water, and the quality of water is better than the standard of drinking water established by the World Health Organization (WHO). Besides, 1 T-MoS 2 /PDA composite still maintain an excellent evaporation performance after treatment of acidic solution and alkaline solution, indicating an excellent durability. This work provides a feasible solution for producing clean water by solar-driven interfacial evaporation from seawater and wastewater.

Hierarchical Titanium Silicalite-1 Zeolites Featuring an Ordered Macro–Meso–Microporosity for Efficient Epoxidations

Shen Yu,Ming-Hui Sun,Yuan-Yuan Wang,Zhan Liu,Jia-Min Lyu,Yi-Long Wang,Zhi-Yi Hu,Yu Li,Li-Hua Chen,Bao-Lian Su

The epoxidation reaction over titanium silicalite-1 (TS-1) zeolites is a green way to produce epoxides that are important intermediates for chemicals. Nevertheless, the conventional microporous TS-1 zeolite shows limited diffusion ability for bulky molecules, leading to poor activity and low selectivity. Constructing hierarchical porosity in microporous materials is an effective strategy to enhance the diffusion properties of catalysts. However, there are few reports on the design and synthesis of TS-1 zeolites with hierarchical structure featuring multilevels, interconnectivity, and regularity for efficient diffusion and epoxidations. Herein, hierarchical TS-1 zeolites with ordered macro–meso–microporosity (OMMM-TS-1) are obtained by a method combining a templated effect of ordered macro–mesoporous matrices and a confined in situ crystallization process. The OMMM-TS-1 possesses ordered macropores with tunable size (∼200–600 nm), ordered mesopores (∼8 nm), and intact micropores (∼0.5 nm). The OMMM-TS-1 achieves a cyclooctene conversion as 3.6 times and 1.8 times and a selectivity to epoxy product as 1.6 times and 1.3 times higher than the conventional TS-1 (C-TS-1) and nanosized TS-1 (Nano-TS-1) zeolites, respectively. The OMMM-TS-1 also outperforms the C-TS-1 and Nano-TS-1 zeolites in epoxidations of a series of alkenes. Such a novel hierarchical structure can be applied in the design and synthesis of many other catalysts.

Reactive flash synthesis and phase compositions of Lix(CoCrFeMnNi)Oy (x = 0–1) oxides

Baisheng Ma,Jincheng Li,Yan Zhu,Kewei Wang,Boyan Sun,Ke Ren

In this paper, the reactive flash sintering method was adopted to synthesize a series of Li x (CoCrFeMnNi)O y oxides with x in the range of 0–1. The phase compositions and electrical conductivities of the oxides at different Li incorporation level were characterized. A single phase of spinel structure ( Fd-3m ) was obtained for the sample (CoCrFeMnNi) 3 O 4 . With incorporation of Li, the phase transformed into Rock-salt structure ( Fm-3m ) and then layered structure ( R-3m ). The ionic and electronic conductivities of the samples were characterized by impedance spectrometry. The ionic and electronic conductivities of the samples decreased with increasing Li incorporation level at first along with the spinel to Rock-salt structure transformation, and then increased with further increasing Li incorporation level along with the Rock-salt to layered structure transformation.

Development of HKUST-1 composites for methane storage by adsorption through incorporation and carbonization

Hu Wang,Qing-rong Zheng,Xuan Zhang,Mengbo Wu

Measures beneficial to enhancing the hydro-stability of the HKUST-1 and improving its adsorptive performance for methane are crucial to the further application. In this research, incorporation of graphene oxide (GO) and carbonization were employed to achieve these objectives. Incorporation of the HKUST-1 was solvothermally prepared by mixing the GO with different mass ratios, and carbonization of the HKUST-1 sample was conducted at different temperatures. Structural characterization, structural morphology observation and adsorption equilibrium measurement of methane were then performed on the samples. Analysis of adsorption equilibrium of methane on the composite was finally carried out within temperature-pressure range respectively about 303.15 K–323.15 K and 0–3.6 MPa. It shows that the sample incorporated by 5 wt% GO has the largest increment about 11.7% and 13.3% in specific surface area and specific micropore volume, and the carbonization conducted at a temperature higher than 300 °C had negative effect on the structure stability of the sample. Results also reveal that the mean relative error between the experimental data and those predicted by Toth equation is about 0.54%. It suggests that the temperature for carbonizing should be carefully selected to avoid the collapse of the structure, and the balance measures should be taken to safeguard the benefit from incorporating.

High efficiency of toluene Ad-/Desorption on Thermal-conductive HKUST-1@BN nanosheets composite

Sheng Li,Sidra Subhan,Liqin Zhou,Jing Li,Zhongxing Zhao,Zhenxia Zhao

Improving the adsorption capacity of the volatile organic compounds (VOCs) will inevitably decrease the desorption efficiency and hence increase more energy-consumption, which has become a crucial challenging problem for MOFs modification and composition toward VOCs adsorption. Herein, a thermal-conductive composition strategy was proposed to anchor BN nanosheets (BNNS) into HKUST-1 crystals via “N/O-Cu-O” interface. The formed HKUST-1@BNNS composite maintained high surface area (1633.7 m 2 /g having more microporous) and enhanced heat diffusivity (1.8 times of HKUST-1), simultaneously. This enabled significant increase of toluene adsorption capacity on HKUST-1@BNNS up to 4.3 mmol/g (2.8 times of HKUST-1) at ultra-low pressure ( P / P 0 ≈ 0.001) and higher desorption rate of toluene ( k ds  = 29.3 × 10 −2 , 4.0 times of HKUST-1) with lower desorption activation energy ( E d  = 33.5 kJ/mol). Compared with many other state-of-the-art adsorbents (e.g., MOFs, zeolites and activated carbons), it has a much higher adsorption capacity and regeneration rate. Thus, thermal-conductive MOFs construction can be deemed as smart strategy to enhance adsorption efficiency and save desorption energy for VOCs capture.

Development of tLyP-1 functionalized nanoliposomes with tunable internal water phase for glioma targeting

Yajing Wang,Ziwei Ding,Shiqun Lv,Jie Liu,Jie Pan,Yingcong Yu,Jun Gao,Xianfeng Huang

Identification of methyl 1-aminocyclopropanecarboxylate as a novel ethylene agonist: a structural analogy approach

Li Xiaofang,Fang Pingping,Li Mingxuan,Xu Pei

Structural analogs of enzyme substrates involved in plant hormone biosynthesis can either inhibit or enhance hormone-related responses depending on their specific chemical characteristics. Ethylene is an important gaseous phytohormone regulating a myriad of physiological and developmental processes. The substrate of the ethylene biosynthesis key enzyme ACC oxidase (ACO), 1-aminocyclopropane-1-carboxylate acid (ACC), is the direct precursor of ethylene. Previous studies have identified a series of ACC analogs as ethylene antagonists competitively binding with ACO. Here, this study identified methyl 1-aminocyclopropanecarboxylate (methyl-ACC), a structural analog of ACC, as an agonist of ethylene response in plants. Methyl-ACC triggered enhanced ethylene-related responses in plants similar to the effects of ACC, such as restrained root elongation, increased root hair number, promoted dark-induced leaf senescence, and accelerated ripening of postharvest tomato fruit. A higher amount of ethylene release was detected from the tomato leaves treated with methyl-ACC than from the mock control. These bioactivities of methyl-ACC render it a potential plant growth regulator (PGR) for the agricultural and postharvest industries. RT-qPCR revealed a generally upregulated expression of the ethylene biosynthesis genes in detached tomato leaves under methyl-ACC treatment. In vivo and in vitro enzymatic activity analyses showed that methyl-ACC had no obvious effect on the total ACO activity in detached tomato leaves nor on the activity of recombinant SlACO1, the predominantly expressed ACO family member in this tissue. This study offers a promising new PGR and adds to the current knowledge on the structure–function-regulation relationship of compounds associated with ethylene biosynthesis. The mechanism by which methyl-ACC exerts its function is discussed.

Identification of novel peptidomimetics targeting the polo-box domain of polo-like kinase 1

Zhiyan Li,Zhenguo Zhang,Huiyong Sun,Lili Xu,Cheng Jiang

A series of new peptidomimetics targeting the polo-box domain (PBD) of polo-like kinase 1 (Plk1) was identified based on the potent and selective pentapeptide Plk1 PBD inhibitor PLHSpT. Unnatural amino acid residues were introduced to the newly designed compound and the N -terminal substituent of the peptidomimetic was investigated. The optimized compound 9 inhibited the Plk1 PBD with IC 50 of 0.267 μM and showed almost no inhibition to Plk2 PBD or Plk3 PBD at 100 μM. Biolayer interferometry studies demonstrated that compound 9 showed potent binding affinity to Plk1 with a K d value of 0.164 μM, while no K d were detected against Plk2 and Plk3. Compound 9 showed improved stability in rat plasma compared to PLHSpT. Binding mode analysis was performed and in agreement with the observed experimental results. There are only two natural amino acids remained in the chemical structure of 9 . This study may provide new information for further research on Plk1 PBD inhibitors.

Large amino acid transporter 1 mediated glutamate modified mesoporous silica nanoparticles for chemophotothermal therapy

Da Wang,Qinfu Zhao,Tongying Jiang,Luping Sha,Siling Wang,Yongbo Song

Glutamic acid modified Pluronic P123 (P123-G) was synthesized to coat hydrophobic mesoporous silica nanoparticles (PGMSN) aiming to target large amino acid transporter 1 (LAT1) overexpressed cancer cells. We discovered that, once internalized, PGMSN could be transported out of the cells with their cargo, and the exported nanoparticles were then taken up by neighboring cells. This intercellular delivery of particles led to a deeper tumor penetration, presumably through tandem cycles of LAT1 mediated endocytosis and exocytosis. Taking advantage of high drug loading capability of MSN, a kind of cyanine dye Cypate acting as a photothermal converting agent was loaded into MSN along with the chemotherapeutic drug doxorubicin hydrochloride (DOX) to improve the anti-cancer effect by the combination of chemotherapy and photothermal therapy (PTT). Both DOX and Cypate stably dispersed in the pores of MSN, and the coating of P123-G serving as diffusion barrier blocked drug preleakage. The system possessed pH and near-infrared (NIR) light dual-responsive DOX release property. Additionally, PGMSN exhibited targeted PTT effect which strengthened cytotoxic activity of the system due to the enhanced endocytosis. So the deep tumor penetration and targeted PTT effect made PGMSN especially suitable for cancers overexpressing LAT1 receptors.

Efficient biodegradation of malachite green by a newly isolated Klebsiella pneumoniae strain WA-1

Chunsheng Li,Dandan Liu,Xianqing Yang,Shengjun Chen,Jianchao Deng,Hui Rong,Chi Li

Biodegradation by microorganisms is a potential treatment technique of malachite green (MG) in aquaculture environments. In this study, a bacterium with high MG decolorization and biodegradation ability was isolated through enrichment culture and color-decoloration circle method, and was identified as Klebsiella pneumoniae WA-1 after molecular and biochemical identification. The MG biodegradation characteristics and the factors affecting the MG biodegradation ability of this strain were studied using KBH 4 reduction-high performance liquid chromatography with fluorescence detector (HPLC-FLD) method. K. pneumoniae WA-1 could efficiently biodegrade MG in aqueous solution without any nutrients that over 94.0% MG was biodegraded by this strain at 1–20 mg/L within 0.5 hr and 100% MG were biodegraded at 1–10 mg/L within 12 hr. Fairly stable MG biodegradation performance was observed in complex environments, including various pH, temperature, salinity, and metal ions, especially at low MG concentration. Furthermore, the presence of NaCl, Mn 2+ , Mg 2+ , or Cu 2+ could enhance the MG biodegradation ability of this strain. These results indicate that K. pneumoniae WA-1 could be used as a potential MG degradation agent in complex aquaculture environments.