查找使用阿拉丁产品的科研文献

Green synthesized MgO combined with dielectric barrier discharge plasma enhanced phosphorus (P) recovery from livestock wastewater: A dual approach for management of wastewater and P resources

Yuan Luo,Yaru Peng,Pengcheng Yan,Miaoqu Wang,Zhibo Zhang,Guangzhou Qu,Esmat F. Ali,Peter S. Hooda,Jörg Rinklebe,Manlin Li,Sabry M. Shaheen,Ronghua Li

Phosphorus (P) recovery from wastewater using integrated techniques i.e., adsorption combined with advanced oxidation technologies is a novel approach for cleaning wastewater and preventing eutrophication. This approach, however, has not been extensively studied, particularly in the context of real wastewater applications. In this study, a green biomass-based sol-gel method was developed using potato starch (PS) and MgCl 2 ·6H 2 O to synthesize MgO (PS-MgO). The unique synthesis method resulted in PS-MgO composed predominantly of spherical particles with an average size of about 103 nm and exhibited superior P adsorption performance compared to commercial MgO materials (GH-MgO and AD-MgO). The Langmuir maximum P adsorption capacity (mg/g) of the PS-MgO was 429.4, while that of the commercial GH-MgO and AD-MgO was 341.3 and 421.7, respectively, at the solution pH 7.0. The kinetic model fitting demonstrated that the adsorption rate of PS-MgO was faster than the two commercial MgOs. Importantly, PS-MgO can maintain a high P adsorption capacity across a wide pH range (425 mg/g at pH 5.0 and 369 mg/g at pH 11.0), whereas the P adsorption capacities of GH-MgO (153 at pH 5.0 and 297 at pH 11.0) and AD-MgO (422 at pH 5.0 and 200 at pH 11.0) were more pH-dependent. In addition, PS-MgO exhibits high selectivity for P capture in solutions containing coexisting ions, and the P-loaded PS-MgO can efficiently release P through acid or base treatment, highlighting its potential for reuse as a fertilizer. To enhance P recovery from real livestock wastewater, the dielectric barrier discharge (DBD) plasma technology was combined with MgO adsorption. The P recovery capacity of MgOs from livestock wastewater increased 1.4–1.7 times after DBD plasma treatment, attributed to the degradation of aromatic proteins and microbial metabolites. These findings provide new insights into the design of efficient and environmentally friendly materials for P recovery, while also demonstrating the potential of integrating advanced oxidation technologies with adsorption processes.

High-Performance NO2 Sensors Based on Ultrathin Heterogeneous Interface Layers

Yangyang Zhu,Qiang Xie,Yang Sun,Lu Wang,Qiang Sun,Lijuan Wang

Gas sensors based on different interface layers are prepared by vacuum evaporation method. In comparison with the microscope images of films on different interface layer, zinc phthalocyanine (ZnPc) films exhibit good continuity on the heterogeneous interface of p -sexiphenyl/α-sexithiophene ( p -6P/α-6T). Under the optimal conditions of ZnPc films, ZnPc film sensors with high performance are obtained based on ultrathin heterogenous interface layers. The responsivity is up to 2271% at 3 ppm NO 2 gas and the sensitivity is 570% ppm −1 . The minimum detection limit of sensors is lower than 500 ppb and the responsivity is 157% to 500 ppb NO 2 gas. The high performance of sensors is attributed to the ultrathin heterogeneous interface layer. The island-like p -6P domains at the bottom provide the precursor for the growth of α-6T layer while the α-6T molecules fill the interval of p -6P islands, as a result, a continuous interface for the growth of ZnPc molecules came into being. In addition, the ZnPc and α-6T films have high electrical characteristics. The results are favorable for the adsorption and desorption of NO 2 gas molecules. The ultrathin heterogeneous interface layer provides a feasible research evidence for the further research and development of ultrathin and flexible electronic devices.

Fabrication and Characterization of Cotton Fabrics with Grafted Thermo-Responsive Random Copolymer Poly(2-(2-methoxyethoxy) Ethoxyethyl Methacrylate-co-Acrylic Acid)

Yang Yi Chen,Qi Zhong,Tao Chen,Ji Ping Wang

The cotton fabrics with enhanced cleaning capability were prepared by grafting thermo-responsive random copolymer poly (2-(2-methoxyethoxy) ethoxyethyl methacrylate-co-acrylic acid), abbreviated as P(MEO2MA-co-AA), to the amino modified cotton fabrics. ATR-FTIR measurement confirmed the immobilization of P(MEO2MA-co-AA) to the cotton fabrics. Equilibrium swelling ratio indicates that the cotton fabric with grafted P(MEO2MA-co-AA) possesses thermo-responsive ability .The enhanced cleaning capability was investigated by the decontamination experiments probed with confocal microscope. The results show the cleaning capability can be prominently improved when the cleaning temperature is lower than the LCST of P(MEO2MA-co-AA).

Phosphorus-doped graphene quantum dots loaded on TiO2 for enhanced photodegradation

Zengsheng Guo,Hao Wu,Ming Li,Tao Tang,Jianfeng Wen,Xinyu Li

Reducing the direct recombination of the photogenerated electron-hole pairs in a photocatalytic system is important to improve the photocatalytic efficiency. Transferring the photogenerated carriers to other adsorbates is a usual way to reduce the direct recombination probability. By synthesizing p-type phosphorus-doped graphene quantum dots (P-GQDs) to form p-n junctions with n-type TiO 2 nanocomposites, the photogenerated holes of TiO 2 can be effectively transferred to P-GQDs, thus the direct carrier recombination of TiO 2 is decreased, resulting in the conspicuous improvement of the Methyl Orange (MO) photodegradation efficiency to 95.5% in 14 min. This work provides a new type of p-n junction in highly efficient photodegradation system.

Construction of columnar cactus-like 2D/1D CdxCu1-xS@CuO shell-core structure photocatalyst for the reduction of CO2 to methanol

Jihai Duan,Pengxia Sun,Hui Zhao,Zhengnan Ji,Delu Zhang,Weiwen Wang

Nanostructure photocatalysts with unique and stable structure and high specific surface area are expected to be widely used in photocatalytic CO 2 reduction. In this paper, columnar cactus-like Cd x Cu 1-x S/CuO/CM composite catalyst was prepared by a simple method combining thermal oxidation with a successive ionic layer adsorption and reaction (SILAR) technique. The combination of Cd x Cu 1-x S nanosheets and CuO nanowires can significantly improve the specific surface area, capacity of light capture and absorption and separation of electrons and holes inside which were beneficial for efficiency of photocatalysis . Their complementary conduction band and valence band positions synergistically form p-n heterojunctions , achieving the effect of multi-level charge separation. The 2D/1D Cd x Cu 1-x S/CuO/CM have better photocatalytic activity than pure CuO nanowires in the production of methanol by using solar energy to reduce CO 2 . After 4 h of irradiation, the methanol yield of 2D/1D Cd x Cu 1-x S/CuO/CM reached 3.60 μmol g −1 cat, which was 2.81 times the yield of pure CuO/CM. This work has certain significance for the development of new energy and environmental protection.

Self-Powered and Highly Efficient Ion-Diffused MAPbBr3 Perovskite Single Crystal-Based UV–Vis Photodiode

Abida Perveen,Yubing Xu,Syed Muhammad Abubakar,Premkumar Sellan,Wang Xin,Fawad Saeed,Sajid Hussain,Byung Seong Bae,Jianming Zhou,Ying Zhu,Wei Lei

The perovskite single crystals (PSC) produced by solution-processed metallic ions doping have a thick p–n junction (greater than 10 µm). Meanwhile, to achieve high responsivity, the carrier drift length (µτE) has to be larger than the dimensions of the detector. If the p–n junction is quite thick, a high bias voltage is required. For the practical application of photodiode, it is imperative to find a means to generate a thin p–n junction. A productive technique is suggested for forming a thin p–n junction by diffusing metallic ions, resulting in a longer drift length of the carrier than the depletion width. Thinner p–n junction leads to reduced dark current density (0.5 µA cm −2 ), low trap density (5.71 × 10 8 cm −3 ), high mobility (417 cm 2 V −1 s −1 ), and hence increased responsivity (77.69 A W −1 ) for 30 µW cm −2 UV illumination under a low applied voltage of −15 V. A quick response time with a rise/fall duration of 22 ms/30 ms under 0 V and long-term stability for over 3 months in ambient airis achieved. To comprehend the performance with the thinner p–n junction-based photodiodes, the results under UV–Vis illumination are examined and compared. The outcomes hint at a method that holds promise for producing efficient photodiodes.

Molecular design towards efficient light-emitting copper(I) halide mononuclear hybrids

Yi Lv,Jing Yang,Haibo Li,Wei Liu,Gangfeng Ouyang

In this paper, the structures and optical properties of copper(I) halide mononuclear hybrids have been studied. Three pairs of compounds with different organic ligands have been synthesized by a precursor approach, exhibiting significantly enhanced stability compared to typical copper halide monomers by the formation of stronger Cu–P bonds, proving that copper halide monomer-type hybrid compounds have the potential to be developed into high-performance light-emitting materials.

Renewable biomass-derived, P-doped granular activated carbon for efficient oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran: Insights into the crucial role of P and N functionality

Zhu Yin,Fengzhen Wu,Changfu He,Lirong Tang,Yandan Chen,Guanfeng Lin,Biao Huang,Jing Chen,Beili Lu

Heteroatom-doped carbon materials for eco-friendly metal-free catalysis have gained increasing attention, but they nevertheless face technological challenges relating to the difficult recycling and high cost. In this work, P-doped granular activated carbons with intrinsic N functionality (PN-GAC-T) were successfully fabricated from low-cost and sustainable waste peanut shells using a simple self-bonding strategy assisted by phosphoric acid. The as-prepared PN-GAC-T were found to have abundant N, P functional groups and large specific surface areas, making them potentially efficient metal-free catalysts for the selective oxidation of 5-hydroxymethylfurfural (HMF). Catalytic results showed that an excellent HMF conversion (98.4%) and 2,5-diformylfuran (DFF) selectivity (99.7%) could be achieved under mild conditions via employing PN-GAC-800 as a catalyst. The good catalytic performance of PN-GAC-800 is highly reliant on the synergistic effect between doped P and intrinsic N functionalities as verified by the control experiments. Furthermore, the density functional theory (DFT) calculations demonstrated that the introduction of both P and N functional groups would aid in the activation of HMF and the improvement of oxygen adsorption capability. This work has emphasized the possibility of high-value exploitation of biomass waste, and it is predicted to provide new inspiration for the development of readily recyclable heteroatom-doped carbon catalysts.

The synthesis and co-micellization of PCL-P(HEMA/HEMA-LA) and PCL-P(HEMA/HEMA-FA) as shell cross-linked drug carriers with target/redox properties

Fan Chen,Yi Li,Ye Fu,Yu Hou,Yuanwei Chen,Xianglin Luo

Strengthening effect of α-ZrP nanosheet inclusions on corrosion resistance and wear resistance of NiP deposits

Yahui He,Shihong Zhang,Yi He,Hongjie Li,Teng He,Ruxia Song,Bo Liu,Zhifei Zhang,Yi Fan

Ni-P/α-ZrP composite coatings were successfully prepared by electroless plating, in which α-ZrP nanosheets were synthesized by reflow method. The surface morphology, element composition, structure and valence composition of the composite coating were analyzed by SEM, EDS, XRD and XPS, respectively. In the reciprocating friction experiment and electrochemical test, the corrosion and wear behaviour of the composite coatings were analyzed. The results show that α-ZrP nanosheets can significantly improve the corrosion and wear resistance of Ni P alloys. With the enrichment of α-ZrP nanosheets, the properties of coatings showed a tendency of increasing first and then slightly decreasing. Ni-P/α-ZrP (1.00 g/L) coating has the lowest porosity and the best corrosion resistance, and its corrosion rate (6.01 × 10 −3  mm/a) is about 1/5 of that of pure Ni P coating (3.12 × 10 −2  mm/a). Ni-P/α-ZrP (1.50 g/L) coating has the best wear performance, its average coefficient of friction (COF) is reduced from 0.568 to 0.167, and the specific wear rate is reduced from 7.13 ± 0.42 (× 10 −6 ) to 0.36 ± 0.06 (× 10 −6 ) (about 1/20 of pure Ni P coating).

Epirubicin loaded with propylene glycol liposomes significantly overcomes multidrug resistance in breast cancer

Ying-Zheng Zhao,Dan-Dan Dai,Cui-Tao Lu,Li-Juan Chen,Min Lin,Xiao-Tong Shen,Xiao-Kun Li,Ming Zhang,Xi Jiang,Rong-Rong Jin,Xing Li,Hai-Feng Lv,Lu Cai,Pin-Tong Huang

Multidrug resistance (MDR) is one of the major reasons for the failure of cancer chemotherapy. A newly reported liposome carrier, propylene glycol liposomes (EPI-PG-liposomes) were made to load epirubicin (EPI) which enhanced EPI absorption in MDR tumor cells to overcome the drug resistance. MDA-MB 435 and their mutant resistant (MDA-MB 435/ADR) cells were used to examine the cellular uptake and P-gp function in vitro for EPI-PG-liposomes by fluorescence microscopy and FCM, respectively. Mammary tumor model was also established to investigate the tumor growth inhibition and pharmacodynamics of EPI-PG-liposomes in vivo . Morphology evaluation showed that EPI-PG-liposomes had a homogeneous spherical shape with an average diameter of 182   nm. Based on cell viability assay, fluorescent microscopy examination, and EPI uptake assay, EPI-PG-liposomes exhibited an effective growth inhibition not only in MDA-MB-435 cells, but also in MDA-MB 435/ADR cells. EPI-PG-liposomes have high permeability not only on tumor cell membrane, but also on cell nucleus membrane. P-gp function assay showed that the anticancer action of EPI-PG-liposomes was not related to P-gp efflux pump, suggesting that PG-liposomes would not affect the normal physiological functions of membrane proteins. EPI-PG-liposomes also showed a better antitumor efficacy compared to EPI solution alone. With high entrapment efficiency, spherical morphology and effective inhibition on MDR cancer cells, EPI-PG-liposomes may represent a better chemotherapeutic vectors for cancer targeted therapy.

Boosting drug bioavailability in men but not women through the action of an excipient

Yang Mai,Diane A.I. Ashiru-Oredope,Zhicheng Yao,Liu Dou,Christine M. Madla,Farhan Taherali,Sudaxshina Murdan,Abdul W. Basit

Active pharmaceutical ingredients are routinely formulated with a range of excipients in the manufacture of drug products. Excipients are considered to be inert components of the formulations, although recent research has contested its inactive behaviour. This study investigated the effect of the excipient polyethylene glycol 400 (PEG 400) on the oral bioavailability and intestinal permeability of cimetidine in male and female human volunteers. Aqueous solutions of cimetidine with pharmaceutically relevant concentrations of PEG 400 at 0% w/v (control), 0.3% w/v, 0.5% w/v, 0.7% w/v and 1.0% w/v were orally administered to both sexes. Urine samples were then collected and assayed for the determination of cimetidine which reflected oral bioavailability. This human study showed that PEG 400 at 0.3% w/v, 0.5% w/v and 0.7% w/v concentrations significantly increased cimetidine bioavailability by 34%, 58% and 41% respectively, although this enhancement was only demonstrated in men and not women (p < 0.05). Ussing chamber transport studies with male human jejunal tissues revealed that cimetidine permeability increased by 26%, 48% and 29% with PEG 400 at 0.3% w/v, 0.5% w/v and 0.7% w/v respectively (p < 0.05). No such enhancement was demonstrated in female tissues (p > 0.05). We have shown that PEG 400 interacts with intestinal P-glycoprotein (P-gp) expression differently in males and females. The mechanistic action of PEG 400 at gut level was further investigated on human jejunal tissues following the pre-treatment of the P-gp inhibitor PSC 833 (valspodar) on the transport of cimetidine. When intestinal P-gp was inhibited, the sex- and dose-dependent modulatory effect of PEG 400 with cimetidine was completely eradicated, thus confirming that PEG 400 has a modulatory – rather than inhibitory – effect on P-gp. In sum, the widely used excipient PEG 400 is not inert at pharmaceutically relevant concentrations and its modulatory effect is demonstrated at a human clinical level. Such pharmacological effects, however, are sex- and dose-dependent via its modulation on intestinal P-gp, as evidenced by the boost in cimetidine bioavailability only in male human volunteers. As such, these findings should be carefully considered towards the co-formulation of PEG 400 with drugs that are P-gp substrates.