JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Junfeng Yang,Yuyang Wu,Yanhui Dong,Hao Cui,Chenyang Shi,Hang Sun,Shengyan Yin
Herein, a ternary Bi@H-TiO 2 /B-C 3 N 4 type II heterostructure is successfully designed and prepared via metal Bi as cocatalyst for photocatalytic H 2 generation. As expected, under λ > 300 nm light, the highest photocatalytic hydrogen production rate (HPR) of Bi@H-TiO 2 /B-C 3 N 4 is up to 223.08 μmol g −1 h −1 . Excitingly, under visible light (λ > 400 nm), the highest HPR of Bi@H-TiO 2 /B-C 3 N 4 is increased to 18.84 μmol g −1 h −1 , which is about 67.3 times, 37.7 times and 6.8 times as high as that of H-TiO 2 , B-C 3 N 4 and H-TiO 2 /B-C 3 N 4 under the same conditions, respectively. Moreover, the electrochemical impedance spectroscopy and transient photocurrent tests manifest that the interface resistance of Bi@H-TiO 2 /B-C 3 N 4 composite decreases and the photocurrent density increases after loading metal Bi. These results indicate that loading metal Bi as cocatalyst (providing more electron trapping sites) is beneficial to improve photocatalytic activity in the type II heterostructure composite. And the electron transfer directions (B-C 3 N 4 → H-TiO 2 → Bi or B-C 3 N 4 → Bi) are proved by ultraviolet photoelectron spectroscopy test. Therefore, the Bi@H-TiO 2 /B-C 3 N 4 photocatalyst with strong visible light absorption is expected to be a promising candidate in photocatalytic fields under visible light.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 4
·1-5
·
IF 6.408
Tian Dazhi,Xiang Wen,Wang Hao,Jiang Wentao,Li Ting,Yang Minghui
B-doped core–shell Fe@BC nanozyme was synthesized. The peroxidase (POD) like activity of Fe@BC nanozyme was studied and utilized for detecting the activity of alanine aminotransferase (ALT). In the presence of ALT as well as ALT co-substrates l -alanine and α-ketoglutarate, l -glutamate is generated. The following catalytic oxidation of l -glutamate by glutamate oxidase leads to the generation of H 2 O 2 . The POD-like activity of Fe@BC can oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) to oxTMB in the presence of H 2 O 2 , generating a blue-colored compound. Through the detection of the amount of H 2 O 2 generated, ALT activity can be determined through measuring the absorbance intensity variation at 450 nm. The limit of detection of the assay is 4 U/L, with a linear range from 10 to 1000 U/L. For human serum samples, the ALT levels determined by our assay are comparable to those determined by the hospital with a correlation coefficient of 0.991, demonstrating the reliability of our assay results. Graphical abstract
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ACS Applied Nano Materials
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2022
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IF 6.14
Yanqun Zhang,Kefeng Zhao,Jingtao Huang,Hsien-Yi Hsu,Jingwei Xu,Rafael Luque,Wenxin Niu,Guobao Xu
Micelles of surfactants have been employed as a powerful tool for the synthesis of hollow nanostructures. Nonetheless, it is still challenging to use micelles to direct the growth of hollow nanostructures with open interiors, especially for crystalline materials. Herein, we report a versatile method to precisely synthesize non-centrosymmetric hollow BiOCl nanocaps with open interiors for the first time. The growth mechanism of the hollow BiOCl nanocaps is elucidated, and the openings of BiOCl nanocaps can be precisely controlled by fine tuning their growth conditions. The non-centrosymmetric BiOCl nanocaps yield a pseudo-first-order degradation kinetic rate constant of up to 0.1217 min–1 in the photodegradation of rhodamine-B, 7.8 times higher than that of common BiOCl nanoplates. This suggests that BiOCl nanocaps show excellent photocatalytic performance to degrade colored rhodamine B. Furthermore, the BiOCl nanocaps can be also extended in the photodegradation of colorless contaminants in industrial wastewater. More importantly, the micelle-directed growth strategy can be generalized to synthesize non-centrosymmetric BiOCl0.5Br0.5 and BiOBr hollow nanocaps. This synthetic strategy heralds a paradigm for designing non-centrosymmetric hollow nanostructures with micelles and may open up an avenue for unique hollow nanomaterials with tailorable structures and properties.
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ACS Applied Energy Materials
·
2022
·
IF 6.959
Guangzhou Hu,Wenying Fu,Yuxiao Lin,Yuanchao Yue,Maosen Wang,Pengbo Liu,Yinwei Li,Jianwei Li,Lu Wei,Xinsheng Zhao,Yongsheng Wei
Electrochemical water splitting to produce clean hydrogen (H2) and oxygen (O2) has emerged as an advanced technology to build a sustainable society. Low-cost electrocatalysts with excellent performance are required to improve the energy efficiency in overall water splitting. Here, a Co-W-B-P/CF catalyst with a nanoflower-like structure consisting of microspheres and nanoflakes was successfully synthesized using a one-step double-pulse electrodeposition approach. When used as a bifunctional electrocatalyst for overall water splitting, Co-W-B-P/CF presented the potentials of 1.57 and 1.86 V at current densities of 10 and 100 mA cm–2 in 1.0 M KOH solution, respectively. This was even comparable to that of the high-cost commercial catalyst Pt/C(−)//IrO2(+). Detailed electrochemical tests also showed that the kinetics, electron transfer, and intrinsic electrocatalytic activity of Co-W-B-P/CF in the HER (hydrogen evolution reaction) and the OER (oxygen evolution reaction) were dramatically improved due to the synergetic effect of co-doped B and P elements. Considering the excellent electrocatalytic performance of Co-W-B-P/CF, along with the simple synthesis method and low cost, bifunctional electrocatalyst Co-W-B-P/CF for overall water splitting is promising.
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FLOW MEASUREMENT AND INSTRUMENTATION
·
2022
·
IF 2.42
Jiahui Zhang,Jingquan Luo,Yiwei Wang,Bo Dong,Zhen Xu,Lin Wang,Aixian Liu,Xuqiang Guo
Hydrodynamic cavitation (HC) commonly occurs within industrial pipelines and its unsteady flow characteristics are of great significance for energy conservation and efficiency improvement. This study investigates the effects of methanol concentration (0–20 wt%) on the cavitating flow characteristics and the degradation of Rhodamine B (RhB) under operating conditions of a 0.7 MPa pressure drop, temperature of 30 °C, 200 passes through a venturi reactor, and an initial RhB concentration of 40 μmol/L. The transient cavitation behavior was monitored using a high-speed camera. The cavitation images show that the presence of methanol generates more stable bubbles, which results in less violent bubble collapse. The pressure pulsation and vibration induced by cavitation flow were synchronously measured using high-frequency pressure and acceleration sensors. The spectral analyses of the pressure pulsation indicate that methanol has no effect on the dominant frequency (∼5.5 Hz) at different positions, and the amplitude initially increases with increasing methanol concentration and then stabilizes. The pressure pulsation intensity increases due to the increased vapor pressure of the solution. The vibration spectral analyses show that methanol has little effect on the peak frequencies, which occur near 4.0 kHz and 14.3 kHz of the low and high-frequency bands, respectively, whereas the peak amplitude decreases with increasing methanol concentration. The per-pass degradation model of RhB in methanol solution considering pyrolysis of methanol was verified for the first time and show to adequately describe the experimental data. The degradation percentage and per-pass degradation factor decrease with increasing methanol concentration. The reduced surface tension of the solution prolongs the bubble lifespan and prevents bubble coalescence , thus weakening the vibration and degradation performance . The results provide important insight for cavitation applications and degradation modeling of mixed solutions.
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Frontiers in Immunology
·
2022
·
IF 8.786
Lixia Gao,Jie Yang,Jutao Feng,Ziying Liu,Ying Dong,Jiangyan Luo,Liangzhentian Yu,Jiamei Wang,Hongying Fan,Weifeng Ma,Tiancai Liu
A viable therapy is needed to overcome the deadlock of the incurable chronic hepatitis B (CHB). The prolonged existence of covalently closed circular DNA (cccDNA) and integrated HBV DNA in the nucleus of hepatocytes is the root cause of CHB. As a result, it is critical to successfully suppress HBV DNA replication and eliminate cccDNA. RNA interference has been proven in recent research to silence the expression of target genes and thereby decrease HBV replication. However, siRNA is susceptible to be degraded by RNA enzymes in vivo , making it difficult to deliver successfully and lacking of tissue targeting. To exploit the advantages of siRNA technology while also overcoming its limitations, we designed a new strategy and prepared biomimetic nanoparticles that were directed by PreS/2-21 peptides and precisely loaded HBV siRNA. Experiments on these nanoparticles in vitro and in vivo revealed that they are tiny, stable, safe and highly targetable, with high inhibitory effects on HBV DNA, pgRNA, cccDNA, HBeAg and HBsAg. PreS/2-21-directed nanoparticles loaded with HBV gene therapy drugs are expected to be promising for the treatment of CHB.
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Biomass Conversion and Biorefinery
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2022
·
IF 4.05
Zhu Bingxing,Yu Yang,Ding Yindi,Ge Shifu
Anaerobic granular sludge (AnGS) is a potential resource for biochar production due to its unique microstructure and high organic contents. In this study, Fe 3 O 4 -loaded biochar derived from AnGS as a catalyst for peroxymonosulfate (PMS) activation was synthesized through iron modification and pyrolysis at different temperatures. The biochar characterization indicated that surface area (249.145 m 2 g −1 ) and microporosity (131.819 m 2 g −1 ) were significantly enhanced at 800 °C. Furthermore, the excellent magnetic properties of the iron-modified biochar at 800 °C (S@Fe-800) (45.28 emu g −1 ) were confirmed, in which Fe 3 O 4 was identified as the dominant reactive species. S@Fe-800 exhibited remarkable PMS activation ability for organic pollutants, which displayed superior Rhodamine B (RhB) removal efficiency. Results from the quenching experiments and electron paramagnetic resonance (EPR) detections demonstrated that the reactive oxidizing species (ROS), including sulfate radical (SO 4 •− ), were generated in the S@Fe-800/PMS system. Meanwhile, the significant intermediates and possible degradation path of PMS decomposition over RhB were proposed. It is believed that this work provides an effective method for organic contaminants removal and a green utilization route for AnGS.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qin Yang,Yujie Zhang,Jie Liang,Yongsong Luo,Qian Liu,Yingchun Yang,Xuping Sun
Sulfate radical based advanced oxidation processes (SR-AOPs) are regarded as a promising technology to degrade organic pollutants in water. Here, hydrothermally synthesized Co-glycerate (Co-G) microspheres are proposed as an efficient heterogeneous catalyst to activate peroxymonosulfate (PMS) for degradation of refractory organic pollutant rhodamine B (RhB) in aqueous solution. The presence of Co-G microspheres enhanced the degradation rate significantly with a short full degradation time (8 min) and a total organic carbon (TOC) removal exceeding 41% (10 min), thus implying the excellent catalytic performance of Co-G microspheres for PMS activation. Furthermore, the effects of PMS and catalyst concentration, initial pH value and co-existing ions on RhB degradation were investigated. Radical quenching and EPR tests identify that active species including SO 4 - ·, HO·, O 2 - · and 1 O 2 are involved in the degradation process. Additionally, a possible reaction mechanism of PMS activation by Co-G microspheres for RhB degradation was suggested. This study can provide a new insight for design of cobalt-based heterogeneous catalysts as activators to activation PMS for pollutants degradation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Xue Shi,Xiaoli Qin,Yunxiang Dai,Xiong Liu,Weifei Wang,Jinfeng Zhong
The catalytic activity of Candida antarctica lipase B (CALB) immobilized on modified cellulose nanocrystals (CNC) with different hydrophobicity was investigated using experimental and theoretical approaches. Firstly, the modified CNC were characterized by multi-spectroscopic methods, water contact angle, scanning electron microscopy and thermogravimetric analysis. Moderately hydrophobic CNC were found to be an optimal support for CALB immobilization. Secondly, model systems contained a CALB molecule and different numbers of modified CNC molecules ( [email protected] , [email protected] and [email protected] ) were prepared for molecular dynamics (MD) simulation. Root-mean-square fluctuation values (0.61–2.61 Å) of lid region were relatively high in [email protected] , indicating that modified CNC with moderate hydrophobicity favored forming a lid-open conformation of CALB. Finally, the esterification of oleic acid catalyzed by the immobilized CALB showed higher conversion (54.68 %) than free CALB (12.98 %). Insights into modified CNC with tunable properties provided by this study may be a potential support for improving the catalytic performance of lipases.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiao Miao,Guina Ren,Xiaolong Zhang,Jianhua Jiao,Changqing Zhu,Qianqian Du,Bo Ge,Cancan Liu
Solar steam generation devices assembled based on interfacial heating technology show the ability to produce clean water, while it faces challenges in the sewage environments. The superhydrophobic fabric was used to selectively adsorb surface oily pollutants based on its non-wettability. Soluble pollutants remaining in water after evaporator treatment can be further removed through photodegradation . Herein, the device composed of superhydrophobic C 3 N 4 /Bi 2 MoO 6 heterojunction , water supply layer and CuO photothermal layer was assembled to remove oily and water-soluble pollutants and produce clean water. The contact angle of water on the superhydrophobic C 3 N 4 /Bi 2 MoO 6 surface reaches 154° and shows the selective adsorption of cyclohexane . The prepared bulk catalyst C 3 N 4 /Bi 2 MoO 6 not only indicate the stability of reuse, but also maintained the degradation efficiency of 98.7% under outdoor light conditions. Through the active species capture experiments, •O 2 − was verified as the main active material in the photodegradation process. The formation of Type II heterojunctions between C 3 N 4 and Bi 2 MoO 6 facilitated the separation of e − /h + at the C 3 N 4 /Bi 2 MoO 6 interface.
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MOLECULES
·
2021
·Vol. 26
·期 22
·6987
·
IF 4.412
Yong Li,Yanfang Liu,Mingqing Zhang,Qianyu Zhou,Xin Li,Tianlu Chen,Shifeng Wang
Photocatalytic degradation, as an emerging method to control environmental pollution, is considered one of the most promising environmental purification technologies. As Tibet is a region with some of the strongest solar radiation in China and even in the world, it is extremely rich in solar energy resources, which is ideal for applying photocatalytic technology to its ecological environment protection and governance. In this study, Na2Ti3O7nanobelts were prepared via a hydrothermal method and converted to TiO2∙xH2O ion exchange, which was followed by high-temperature calcination to prepare TiO2(B) nanobelts (“B” in TiO2(B) means “Bronze phase”). A simple in situ method was used to generate Ag3PO4particles on the surface of the TiO2nanobelts to construct a Ag3PO4/TiO2(B) heterojunction composite photocatalyst. By generating Ag3PO4nanoparticles on the surface of the TiO2(B) nanobelts to construct heterojunctions, the light absorption range of the photocatalyst was successfully extended from UV (ultraviolet) to the visible region. Furthermore, the recombination of photogenerated electron–hole pairs in the catalyst was inhibited by the construction of the heterojunctions, thus greatly enhancing its light quantum efficiency. Therefore, the prepared Ag3PO4/TiO2(B) heterojunction composite photocatalyst greatly outperformed the TiO2(B) nanobelt in terms of photocatalytic degradation.Keywords:photocatalyst;heterojunction;photocatalytic degradation;TiO2(B) nanobelts
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Hai Shi,Youjing Gong,Qizhi Liang,Jinlong Li,Yang Xiang,Genxi Li
To improve long-term graft patient outcomes and develop more effective antirejection therapies, noninvasive monitoring of acute cellular rejection (ACR) after organ transplantation is urgently needed. As a biomarker of ACR, Granzyme B (GrB) is expected to be applied in the noninvasive monitoring of ACR. Herein, we have developed a method for detecting the GrB activity based on the target-initiated great change in electrochemical steric hindrance by designing a nanoprobe. The nanoprobe is prepared by conjugating a specific peptide, which is responsive to GrB cleavage activity, to gold nanoparticles (AuNPs). Meanwhile, a piece of DNA sequence with G-quadruplex (G4) is attached at the distal end of the peptide. Upon exposure to GrB, the peptide substrate is cleaved to eliminate the steric hindrance between inter-nanoprobes as well as nanoprobe and DNA tetrahedron (TDN), allowing the released DNA strand to hybridize with TDN, giving sensitive signal output. The method can also be used to detect GrB activity in complex biological settings, so it has a great potential for monitoring GrB activity in the blood or urine of graft patients.
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