CHEMOSPHERE
·
2023
·
IF 8.8
Lin Dong,Yunlan Xu,Dengjie Zhong,Haixing Chang,Jun Li,Yi Liu,Zhuofan Han
In order to develop efficient photoanode to improve the performance of visible light responsive photocatalytic fuel cell (PFC), in this work, polyaniline/g-C 3 N 4 /Bi 2 O 3 /Ti photoanode was successfully prepared using silica-sol drop coating method, and assembled with Cu cathode to construct PFC to decompose rhodamine B and generate electricity simultaneously. The degradation rate, maximum photocurrent density and maximum power density of this PFC were 91.23%, 0.086 mA cm −2 and 4.78 μW cm −2 , respectively, which were 1.4 and 1.8 times, 2.4 and 4.5 times, and 1.9 and 7.3 times those of the corresponding values of the PFCs with g-C 3 N 4 /Bi 2 O 3 /Ti and Bi 2 O 3 /Ti photoanodes, respectively. This is attributed to the type II heterojunction structure formed among polyaniline, g-C 3 N 4 and Bi 2 O 3 in the polyaniline/g-C 3 N 4 /Bi 2 O 3 /Ti photoanode. Among them, polyaniline has π-π conjugated structure, which can rapidly transfer the electronic charge between g-C 3 N 4 and Bi 2 O 3 , thus enhancing the separation efficiency of photo-generated e − -h + pairs spatially and reducing their recombination, extending the visible light response wavelength of the photocatalyst, and finally improving its photocatalytic properties. This study can provide significant reference for the research of Bi 2 O 3 -based visible light responsive PFC.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2023
·
IF 3
Jing Wu,Yan Xu,Jiahong Yang,Xinyue Yu,Zhaodi Han,Linling Guo,Yin Huang,Yuxin Zhang
B vitamins play important roles in various physiological processes, including cell metabolism and DNA synthesis. The intestine is critical for the absorption and utilization of B vitamins, but few analytical methods for detecting intestinal B vitamins are currently available. In this study, we developed a novel liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the simultaneous quantification of 10 B vitamins in mouse colon tissue, including thiamin (B1), riboflavin (B2), nicotinic acid (B3), niacinamide (B3-AM), pantothenic acid (B5), pyridoxine (B6), pyridoxal 5′-phosphate (B6-5P), biotin (B7), folic acid (B9), and cyanocobalamin (B12). The method was thoroughly validated following the U.S. Food and Drug Administration (FDA) guidelines and yielded good results in terms of linearity (r 2 > 0.9928), lower limit of quantification (40–600 ng/g), accuracy (88.9–119.80 %) and precision (relative standard deviation ≤ 19.71 %), recovery (87.95–113.79 %), matrix effect (91.26–113.78 %), and stability (85.65–114.05 %). Furthermore, we applied our method to profile B vitamins in the colons of mice with breast cancer after doxorubicin chemotherapy treatment, which revealed that the doxorubicin treatment led to significant colon damage and accumulation of several B vitamins including B1, B2 and B5. We also confirmed the capability of this method for quantifying B vitamins in other intestinal tissues like the ileum, jejunum, and duodenum . The newly developed method is simple, specific, and useful for targeted profiling of B vitamins in mouse colon, with a potential for future studies on the role of these micronutrients in healthy and diseased states.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Xuan Li,Li Liu,Xue Dong,Guanhui Zhao,Yueyuan Li,Juncong Miao,Jinglong Fang,Min Cui,Qin Wei,Wei Cao
A sensitive dual mode competitive electrochemical immunosensor for the detection of B-type natriuretic peptide (BNP) was successfully fabricated, which based on differential pulse voltammetry (DPV) and amperometric i-t curve response modes. Polyaniline (PAN) and tin dioxide (SnO 2 ) were loaded on graphene sheets (GS), which could effectively promote the electron transfer process, thereby amplifying the current signal and increasing the sensitivity of the immunosensor. To promote biocompatibility, gold nanoparticles (Au) were incorporated on GS/SnO 2 /PAN (GS/SnO 2 /PAN-Au). GS/SnO 2 /PAN-Au complex was gotten to act as the platform which could provide a clearly DPV signals. N-doped carbon nanotubes (N-CNTs) embellished by ZnCo 2 O 4 quantum dots (ZnCo 2 O 4 /N-CNTs) with excellent catalytic properties for the reduction of H 2 O 2 was gotten to act as the label of the antibody-BNP (Ab), providing an obviously current signal through amperometric i-t curve method. A large quantity of BNP could be stable loaded in the modified electrode via GS/SnO 2 /PAN-Au with excellent electrical conductivity and good biocompatibility , which could compete with target-BNP to combine Ab that labelled by ZnCo 2 O 4 /N-CNTs. Under the optimum conditions, the immunosensor exhibited remarkable analytical performance of a linear range from 0.01 pg/mL to 1 ng/mL with a detection limit of 3.4 fg/mL for quantitative detection of BNP (S/N = 3). This method was able to become a universal strategy for other biological detection.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Chun Huang,Yulan Wang,Miao Gong,Wei Wang,Yang Mu,Zhen-Hu Hu
The discharging of Rhodamine B (RhB) from wastewater has caused huge environment pollution. Peroxymonosulfate (PMS) oxidation is an effective way to remove it from wastewater. However, finding an environmentally friendly metal to activate PMS is a key step for the oxidation process. In this study, nanorod α-MnO 2 loaded palygorskite (α-MnO 2 /Pal) was fabricated by a simple hydrothermal method. The analysis of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) confirmed the loading of α-MnO 2 on the surface of Pal and characterized the surface of the composite. The surface area of α-MnO 2 /Pal composite was 159.13 m 2 /g, which was much higher than that of Pal and α-MnO 2 . The Pal, α-MnO 2 , Mn 2+ , and α-MnO 2 /Pal were used to activate PMS for RhB degradation. Nearly 100% RhB degradation was obtained in α-MnO 2 /Pal + PMS system in 180 min and in α-MnO 2 + PMS system in 300 min, while only 50% degradation was obtained in Pal + PMS system and 71.4% degradation in Mn 2+ + PMS system in 300 min. The degradation fitted the pseudo-first-order reaction kinetics well with rate constant of 0.02041 min −1 for α-MnO 2 /Pal + PMS system, 0.01192 min −1 for α-MnO 2 + PMS system, and 0.00435 min −1 for Mn 2+ + PMS system, respectively. The factors affecting RhB degradation were further investigated. The RhB degradation efficiency increased with the increase of α-MnO 2 /Pal dosages, PMS dosages and temperatures. The degradation was inhibited at pH > 5.5, while was favorable at pH < 5.5. The major reactive radicals responsible for RhB degradation classified by radical quenching experiment were O 2 − and 1 O 2 . The possible mechanism was further proposed based on the results. The α-MnO 2 /Pal composite showed nearly 50% mineralization ratio in the presence of PMS and an excellent reusability. The results from this study revealed that α-MnO 2 /Pal composite is an effective catalyst to activate PMS for RhB degradation.
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IONICS
·
2019
·Vol. 25
·期 11
·5353-5360
·
IF 2.289
Ren Xiaoying,Xu Tao,Du Junlin,Pu Zhaohui,Wang Runbo,Wu Zhu
High-temperature battery system operated at or below 300 °C is highly desired for geothermal borehole applications. However, it remains a challenge to find suitable electrode materials meeting the need of wide borehole temperature. In this study, the discharge performance of Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy battery system was studied over the temperature range of 150~300 °C with different current densities ranging from 10 to 30 mA cm −2 . The electrochemical test result showed that the single cell delivered maximum discharge capacity at 250 °C, with value of 1178.6 mAh g −1 at a current density of 10 mA cm −2 . Besides, it is found that the discharge capacities of the single cell increased as the current density rose at 300 °C attributed to the enhanced ionic conductivity at high temperature. As a result, the Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy system is capable of being used in instrumentation for geothermal and oil/gas borehole explore between 200 and 250 °C.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2018
·Vol. 215
·期 11
·1701061
·
IF 1.795
Binrong Li,Jinyu Chu,Yi Li,Minjia Meng,Yanhua Cui,Qidi Li,Yonghai Feng
Photocatalytic degradation is an effective method for fast removal of dye-contaminated water. In the present work, a bismuth oxide/zinc sulfide-cellulose acetate photocatalytic membrane (Bi 2 O 3 /ZnS-CA) is successfully fabricated via the phase-inversion method with a Bi 2 O 3 /ZnS heterojunction as the photocatalyst. The Bi 2 O 3 /ZnS-CA membranes shows high photocatalytic activity in degradation of Rhodamine B (RhB) under visible-light irradiation due to the Bi 2 O 3 /ZnS heterojunction structure contributing to the high efficiency of photogenerated charge separation. The photodegradation efficiency of Bi 2 O 3 /ZnS-CA membrane is significantly enhanced (about 30% improvement) and the photodegradation kinetic is four times faster than that of the Bi 2 O 3 -CA and the ZnS-CA membranes. Moreover, the Bi 2 O 3 /ZnS-CA membrane exhibits excellent permeation flux (649.7 L m −2 h −1 ) and high porosity (69.94%). The Bi 2 O 3 /ZnS-CA membrane also shows good adsorption performance of RhB, which could enhance the interaction between RhB and the catalyst. This work provides a new sight to construct highly effective visible-light-driven photocatalytic membranes for continuous organic dye treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 11
·9613-9620
·
IF 2.324
Zhang Jun,Kong Wenwen,Chang Aimin
The [Mn 1.56 Co 0.96 Ni 0.48 O 4 ] 1−x [SrMnO 3 ] x ((MCN) 1−x (SM) x , 0 ≤ x ≤ 0.5) ceramic thin composite films were grown on SiO 2 /Si (100) substrates by the chemical solution deposition (CSD) method. The results of X-ray diffraction showed that the (MCN) 1−x (SM) x (0 < x ≤ 0.5) films were a resemblance of the spinel–perovskite composite structure. The field emission scanning electron microscope analyses presented a considerable improvement in relative density with the increasing of the SM contents. In particular, the thermal constant of (MCN) 1−x (SM) x ceramic film increased from 3289 to 5390 K with the increasing of the SM contents (x) from 0 to 0.5. This feature was attributed to the increase in the grain boundary resistance and the increase in Mn 3+ /Mn 4+ pairs as the SM contents increased. From the spectroscopic ellipsometer spectroscopy results, it was found that the (MCN) 0.5 (SM) 0.5 film had the biggest refractive index n value of 2.36 at 1.5 eV and a strong absorption peak at 4.0 eV. The sensitivity of MCN spinel ceramic film was enhanced by the compounding of SM. It was a significant disposition in the study of negative temperature coefficient thermistors.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2018
·
IF 1.911
Yongli Shi,Jintao Xue,Zhaojie Liu,Mengjiao Du,Lanting Xu,Qianqian Sun,Zhaomin Liu,Qing Shang
In this study, a novel chitosan (CS)-modified nanoparticles (NPs) were developed to orally deliver tolbutamide (TOL). Methoxy poly(ethylene glycol)- b-poly(ε-caprolactone) carboxylates (mPEG2000-b-PCL4000) was synthesized via an esterification reaction. CS-modified mPEG2000-b-PCL4000-COOH NPs (CS@NPs) were fabricated by injecting mPEG2000-b-PCL4000-COOH NPs suspension (1.0 mg/mL) into CS solution (1.0 mg/mL, pH 5.0). Fourier transform infrared spectroscopy (FTIR) spectra were used to confirm the obtaining of mPEG2000-b-PCL4000-COOH. Transmission electron microscope (TEM) was carried out to observe morphology of all NPs. Nano ZS90 Malvern ParticleSizer were used to monitor the size distribution of obtained NPs. Thermogravimetry analysis (TGA) was performed to investigate the thermostability of CS@NPs. In vitro TOL release profiles were carried out in pH 1.2 and 7.4 buffers. FTIR spectra confirmed the obtaining of mPEG2000-b-PCL4000-COOH. TGA curves indicated that the protection of CS shells improved the thermostability of mPEG2000-b-PCL4000-COOH NPs. Cell tests indicated the CS@NPs had no obvious cytotoxicity, and they were easily taken up by 293T cells. In vitro release profiles showed that 91.0 ± 1.9% of encapsulated TOL were released from TOL-CS@NPs in pH 7.4 buffer. Therefore, the positive potential of CS@NPs could increase their combining capacity with intestinal mucosal cells. Finally, these NPs would improve the bioavailability of hydrophobic drugs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Yue Li,Nanjing Zhong,Ling-Zhi Cheong,Jianrong Huang,Hongxiao Chen,Shaoyan Lin
In this study, SBA-15 was modified by a series of silane coupling reagents and later used to immobilize Candida antartica lipase B (CALB). The enzymatic properties of the immobilized CALB samples were studied. In addition, the catalytic performance in glycerolysis of soybean oil for diacylglycerols (DAG) production was also investigated. The highest enzymatic activity up to 6100.00 ± 246.41 U/g was observed from the propyl methacrylate group modified SBA-15 supported CALB. No loss of activity was observed from the propyl methacrylate group modified SBA-15 supported CALB, but a higher-than-initial activity was notably found from 3-aminopropyl group and n -octyl group modified SBA-15 supported CALB after a 4-h incubation in air at 70 °C. 1-isocyanatopropane group modified SBA-15 supported CALB exhibited selectivity for DAG production. DAG content up to 61.90 ± 2.38 wt% and a DAG/MAG ratio at 3.11 ± 0.08 was obtained after a 24-h reaction at 60 °C in a solvent-free system.
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RSC Advances
·
2018
·Vol. 8
·期 46
·25873-25880
·
IF 2.936
Jie Guo,Yongjiang Hou,Bo Li
A hollow Ni–Fe–B nanochain is successfully synthesized by a galvanic replacement method using a Fe–B nanocomposite and a NiCl2 solution as the template and additional reagent, respectively. Both the concentration of Ni and the morphology of the resulting Ni–Fe–B alloy are controlled by varying the duration of the replacement process during the synthesis. The Ni–Fe–B sample synthesized for 60 min (Ni–Fe–B-60) shows the best catalytic activity at 313 K, with a hydrogen production rate of 4320 mL min−1 gcat−1 and an activation energy for the NaBH4 hydrolysis reaction of 33.7 kJ mol−1. The good performance of Ni–Fe–B-60 towards the hydrolysis of NaBH4 can be ascribed to both hollow nanochain structural and electronic effects. Furthermore, the effects of temperature, catalyst amount, and concentration of NaOH and NaBH4 on the hydrolysis process are systematically studied, and an overall kinetic rate equation is obtained. The hollow Ni–Fe–B nanochain catalyst also shows good reusability characteristics and maintained its initial activity after 5 consecutive cycles.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 16
·14954-14966
·
IF 2.195
Fang Hongjun,Pan Yusong,Yin Minyuan,Pan Chengling
Active co-catalysts have been extensively used for improving photocatalytic activity in semiconductor-based photocatalytic systems. Herein, 2D alkalized Ti 3 C 2 (Ti 3 C 2 -OH) nano-sheets were coupled with CdS via a facile electrostatic self-assembly strategy and combined with hydrothermal method to prepare Ti 3 C 2 -OH/CdS photocatalyst. The morphologies, crystal phases, optical and photoelectrical properties of the prepared photocatalysts were characterized by XRD, SEM, TEM, FTIR, PL, and EIS analysis, respectively. The photocatalytic degradation results verified that the photo-degradation performance of Ti 3 C 2 -OH/CdS photocatalyst (degradation of 97% RhB in 100 min) was obviously superior to that of pure CdS (degradation of 70% RhB in 100 min) and Ti 3 C 2 /CdS (degradation of 82% RhB in 100 min). The active species trapping experiments for Ti 3 C 2 -OH/CdS photocatalyst revealed that the superoxide radical ( · O 2 − ) and holes (h + ) were the predominant species for degradation of RhB. Furthermore, the Ti 3 C 2 -OH co-catalyst in the Ti 3 C 2 -OH/CdS composite not only played the role of promoting the effective separation of photo-generated electron–hole pairs, but also constructing strong connections with CdS semiconductor to establish heterostructure, ultimately enhancing the photocatalytic performance of the Ti 3 C 2 -OH/CdS photocatalyst.
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TALANTA
·
2017
·
IF 4.162
Lu Ding,Chunlan Xiang,Gang Zhou
Poly(acrylic acid) (PAA) brushes coated onto silica nanoparticles have been widely utilized in bioassays due to their abilities of providing favorable microenvironments and ensuring good biological activities for biomolecules. However, traditional PAA brushes are synthesized by reversible addition–fragmentation chain transfer polymerization. Hence, it is generally difficult to control and characterize the molecular weight of the PAA brushes, which may depress the reproducibility and bring more uncertain results. Herein, atom transfer radical polymerization method is employed to synthesize β -cyclodextrin-cored PAA with uniform and controllable molecular weight. After loading on the surfaces of adamantane-functionalized silica nanoparticles via host-guest interactions, glucose oxidase and probe single strand DNA (ssDNA) are further immobilized on the as-prepared nanoparticles. Meanwhile, capture ssDNA is functionalized on amino modified magnetic beads. In the presence of ssDNA sequence of Hepatitis B Virus (HBV) containing completely matched sequence of both probe and capture ssDNA, a bioconjugate is formed and can be separated by an external magnet. The isolated glucose oxidase can further catalyze glucose into gluconic acid and H 2 O 2 , and then reduce HAuCl 4 on Au seeds. By monitoring the absorption intensity change of the Au NPs at 530 nm, the proposed biosensor with novel signal amplification probes can be used to detect DNA sequence of HBV with high sensitivity and selectivity in both buffer and serum samples. This developed strategy has presented a new way to construct silica nanoparticles coated by PAA brushes for the fields of clinical diagnosis and other life sciences.
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