ANALYTICAL CHEMISTRY
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2021
·
IF 6.986
Yongchao Fan,Mengmeng Lv,Yuan Xue,Jing Li,Erkang Wang
A highly fluorescent emission reaction between terephthalic acid (PTA) and ascorbic acid (AA) via simple control of the reaction temperature was first revealed with the detailed formation mechanism and various characterizations including electron paramagnetic resonance and mass spectrometry. Based on the AA-responsive emission, the alkaline phosphatase (ALP) triggered the transformation of l-ascorbic acid 2-phosphate trisodium salt to AA was integrated with the present system for developing a sensitive, selective, and universal platform. The monitoring of the activity of ALP and the fabrication of ALP-based enzyme-linked immunoassay (ELISA) with carcinoembryonic antigen (CEA) as the model target was performed. The fluorescence intensity correlated well to the CEA concentration in the ranges of 0.25–30 ng/mL, with a detection limit of 0.08 ng/mL. Such a facile protocol based on the fluorescent reaction between PTA and AA without the assistance of catalysis of nanomaterials avoided the laborious synthesis procedure and provided a direct strategy for the early clinical diagnosis coupled with ALP-related catalysis.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Feng Zhu,Xingyun Hu,Linghao Kong,Xianjia Peng
Sulfide precipitation is an efficient method to remove Cu(II) and As(III) from strongly acidic wastewater, but the instantaneous release of H 2 S from traditional sulfuration reagents causes serious H 2 S pollution. Moreover, the obtained precipitates are mixtures of CuS and As 2 S 3 , leading to difficulties in resource recovery. In this study, a calcium sulfide-organosilicon complex (CaS-OSCS), in which CaS was coated into a matrix of {[O 1.5 Si(CH 2 ) 3 NH]CS} n (OSCS) via the coordination bonding, was developed. OSCS, as a matrix of CaS-OSCS, can ensure the sustained and stable release of H 2 S under strongly acidic conditions owing to its low swelling (1.75% swelling ratio) and excellent acid resistance. The release longevity of H 2 S from CaS-OSCS extended from 5 min up to 50 min compared with that from CaS because the hydrophobic OSCS prevented solution diffusing to the pores of CaS-OSCS and thus slowed down the hydrolysis of CaS in pores. 99% of Cu(II)/As(III) was precipitated without H 2 S escape, and the dosage of sulfuration reagents was reduced by 30%. In addition, CaS-OSCS improved the selective separation of copper from wastewater, and a separation factor between Cu(II) and As(III) reached 2376. This study provides a potential approach for the elimination of H 2 S pollution and selective recovery of copper.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Chen Li,Zihan Li,Xiaosi Qi,Xiu Gong,Yanli Chen,Qiong Peng,Chaoyong Deng,Tao Jing,Wei Zhong
Using previous models and theories to construct and develop high-efficient microwave absorbers (MAs) should be a strategic and effective ways to optimize the electromagnetic wave attenuation. Herein, the ultralow density and flexible graphene oxide foam (GOF) and reduced graphene oxide foam (RGOF)/MoS 2 nanosheets were designed and fabricated by the method of chemical vapor deposition and hydrothermal reaction. The obtained GOF and RGOF/MoS 2 samples exhibited very excellent microwave absorption properties while their densities were merely 0.0082 and 0.0084 g•cm −3 , respectively. More importantly, benefiting from the excellent synergistic effect between RGOF and MoS 2 , the designed RGOF/MoS 2 well inherited the combined advantages of GOF and MoS 2 in terms of strong absorption abilities, broad absorption bandwidth and thin matching thicknesses. The values of minimum reflection loss and effective frequency bandwidth for RGOF/MoS 2 sample could reach up to −62.92 dB with the matching thickness of 2.27 mm and 4.48 GHz with the matching thickness of 2.12 mm, which were very desirable for high-performance MAs. Moreover, the obtained results indicated that the microwave absorption properties of RGOF/MoS 2 sample could be further optimized by regulating the MoS 2 content. Therefore, a new and effective strategy was proposed to develop high efficiency MAs with ultra-lightweight, wide-band, thin thickness and strong absorption capabilities.
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APPLIED CLAY SCIENCE
·
2021
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IF 5.467
Tiantian Dai,Ziying Yuan,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
Z–scheme heterojunction has the advantages of high carrier separation efficiency and strong oxidation ability, which is a potential material for photodegradation . In this paper, CdS@Zn,Cr-layered double hydroxides (CdS@LDHs) Z–scheme heterojunction was synthesized and used for photocatalytic degradation of tetracycline (TC). The effects of the amount of catalyst, pH value of the solution, initial concentration of TC, light intensity , and reaction temperature were studied. The degradation kinetics and mechanism were also discussed in detail. Under the optimal conditions (initial concentration of TC 50 mg/L, pH 9, light intensity 500 W, the amount of the catalyst 25 mg, and reaction temperature 45 °C), the highest removal percentage and the corresponding activity of CdS@LDHs was 93.04% and 37.09 mg g −1 h −1 , respectively. In addition, DFT calculation confirmed the existence of built–in electric field (BIEF) in the heterojunction, which promotes the electron transfer from CdS to LDHs. The amount of electron transfer was accelerated, and the recombination of electron and hole was obviously inhibited, so that they were more involved in oxidation and reduction. Thus, it makes CdS@LDHs heterojunction as a highly efficient catalyst for photodegradation of TC.
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Solar RRL
·
2021
·Vol. 5
·期 8
·2100216
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IF 8.582
Bin Xu,Xiatong Qin,Xiaoshuang Lu,Yulin Liu,Ye Chen,Hui Peng,Pingxiong Yang,Junhao Chu,Lin Sun
Cu 2 ZnSn(S,Se) 4 has been widely regarded as a promising thin-film solar cell material. In recent years, the development of Cu 2 ZnSn(S,Se) 4 solar cells has encountered a bottleneck, and the higher open-circuit voltage deficit mainly caused by the secondary phase, CZTSSe/CdS interface recombination, deep-level defects, and band-tailing effects has been an outstanding issue. Herein, the influence of the composition and phase distribution of the precursor thin film on the defect and performance of Cu 2 ZnSn(S,Se) 4 solar cells is studied. By modifying the distribution of composition and phase for precursor films, a Cu 2 ZnSn(S,Se) 4 absorber layer without secondary phase and with fewer detrimental defects can be obtained from the pure-phase precursor film. Thanks to the reduction of the band-tailing effects, the increase in the depletion width for heterojunction, and the decrease in CZTSSe/CdS interface recombination, the photovoltaic performance of CZTSSe thin-film solar cells is significantly improved. Finally, based on the excellent kesterite absorber layer, a Cu 2 ZnSn(S,Se) 4 solar cell with 11.51% power conversion efficiency (the active area efficiency is 12.4%) is prepared.
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JOURNAL OF SEPARATION SCIENCE
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2021
·Vol. 44
·期 17
·3295-3304
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IF 3.645
Xiuyu Sui,Jin Guan,Xiaoyu Li,Lei Gu,Feng Yan,Shuang Shi,Dongxiang Zhang
An open tubular capillary electrochromatography column was prepared by immobilizing β-cyclodextrin on the inner wall of pretreated capillary via noncovalent adsorption of polydopamine. The resulting coating layer on the capillary was characterized by scanning electron microscopy and Fourier transform infrared spectroscopy. Electroosmotic flow was studied to evaluate the variation of the immobilized columns. The prepared columns showed good chiral separation performance toward five proton pump inhibitors including lansoprazole, pantoprazole, tenatoprazole, rabeprazole, and omeprazole. The influences of β-cyclodextrin concentration, coating time, buffer pH, buffer concentration, and applied voltage on separation were investigated. In the optimum conditions, the enantiomers of five analytes were fully resolved within 15 min with high resolutions of 4.57 to 8.13. The method was extensively validated in terms of accuracy, precision, and linearity and proved to be robust. The relative standard deviation values for migration times and peak areas of the analytes representing intraday and interday were less than 1.9 and 3.6%, respectively. Further, the polydopamine/β-cyclodextrin coated capillary column could be successively used over 100 runs without showing significant decrease in the separation efficiency.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Ahmad Beyhaqi,Seyed Mohammad Taghi Azimi,Zhihong Chen,Chun Hu,Qingyi Zeng
Exfoliated and plicated g-C 3 N 4 nanosheets (CNsF) were prepared through a thermal-chemical exfoliation in which the bulk g-C 3 N 4 was obtained first under thermal exfoliation, and then was exposed to an acidic etching using hydrofluoric acid under hydrothermal condition. The acidic etching not only exfoliated g-C 3 N 4 nanosheets by disrupting weak van der Waals forces between layers, which led to formation of a monolayer or a few layers of g-C 3 N 4 nanosheets, but also made disordered defects on its surface and created plicated g-C 3 N 4 nanosheets. Under visible-light illumination, the optimized sample (CNsF-6%) showed a hydrogen evolution rate of 54.13 μmol h −1 g −1 (without co-catalyst) and a specific surface area of 121.4 m 2 g −1 , which were about 4.7 and 2.5 times, respectively, higher than pristine g-C 3 N 4 . It also showed remarkably enhanced photocatalytic performance in removing various organic pollutants. This remarkable improvement probably arises from the porous nanosheets and an increased number of active sites resulting from the CNsF, which subsequently enhanced the charge separation efficiency. This work provided an alternative way to obtain highly active g-C 3 N 4 photocatalysts .
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CARBON
·
2021
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IF 9.594
Xing-hai Zhou,Yuan Gao,Li-hua Lyu,Yue-yao Liang,Zhen-huan Li
The rational design of electrode architecture coupling with high specific capacity nanomaterials is highly desirable to build superior energy storage system . Herein, molybdenum-based compounds embedded in flexible 3D interconnected porous carbon nanofibers with protective porous carbon shell are constructed via a facile electro-blowing spinning technique using as free-standing lithium-ion battery (LIB) anodes. Such a well-designed architecture possesses large surface area, protective porous carbon shell and 3D interconnected porous structure . Moreover, various high specific capacity molybdenum-based compounds, including MoS 2 , MoO 2 and MoN, can homogenously disperse within the fibers under different carbonization condition, especially, some of them are bridged to the fiber skeleton through a thin graphite carbon layer . The synergetic coupling effects benefited from the structural and material advantages are effective to provide more lithium-ion storage active sites, fast electrons/ions transfer pathways and good structural integrity. Using as free-standing anodes of LIB, the three fibrous anodes deliver an excellent electrochemical performance in terms of high specific capacity, superior rate capability and satisfied cycling stability. Extraordinarily, the well-designed architecture of fibrous anodes might open a new paradigm to boost the creation of high-performance electrodes for various energy storage devices.
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ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Xiaojing Zhu,Qikai Wu,Jiale Dai,Dengke Zhao,Chenghao Yang,Ligui Li,Nanwen Li,Shaowei Chen
Directly pyrolyzing organometal complex represents a judicious strategy to fabricate efficient multifunctional carbon-based electrocatalysts , but the structure/composition of the catalysts is commonly complicated and the corresponding electrocatalytic activities are usually compromised. In this study, we report a selective leaching route to prepare small Co 9 S 8 nanoparticles supported on nitrogen, sulfur codoped porous carbon nanosheets (Co 9 S 8 @PNSC) by pyrolyzing sheet-like Co(II)-coordinated thiourea-ethylenediamine-formaldehyde resin (Co-TEFR)/polydopamine (PDA) hybrids that are covered by silica shell layer, followed by removal of the silica and Co nanoparticles with NH 4 HF 2 through a wet etching method. Consequently, the resultant Co 9 S 8 @PNSC exhibits high specific surface area, hierarchical porosity and tiny Co 9 S 8 nanoparticles, which are conducive to the maximal utilization of active sites, endowing remarkable oxygen electrocatalysis with a half-wave potential of +0.845 V for oxygen reduction reaction and a low overpotential of 314 mV at current density of 10 mA cm −2 for oxygen evolution reaction. Besides, such composite also shows a considerable electrocatalytic performance for hydrogen generation. When applied in an assembled zinc-air battery, Co 9 S 8 @PNSC displays a high power-density (203 mW cm −2 ) and favorable cycling lifespan. The results from the present strategy may provide an exemplification in rational design and fabrication of carbon-based nanocomposite for high-performance multifunctional electrocatalysis.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 5
·1389-1397
·
IF 8.131
Cheng Cheng,Dongyun Chen,Najun Li,Hua Li,Qingfeng Xu,Jinhui He,Jianmei Lu
Hexavalent chromium (Cr(VI)) poses a serious threat to the environment and human health due to its high-toxicity and carcinogenicity. For efficient removal of Cr(VI), semiconductor photocatalytic reduction methods have been investigated, especially those using hollow structures. In this work, a hollow In2S3/CdIn2S4 composite photocatalyst was prepared via ion exchange for the reduction of Cr(VI). The microstructure, composition, optical properties, and elements of the In2S3/CdIn2S4 composites were characterized via scanning electron microscopy, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Because of the molecular level heterojunction constructed through ion exchange and the hollow structure, the prepared photocatalyst demonstrated excellent catalytic properties for Cr(VI) reduction. Besides, a Cr(VI) aqueous solution (50 mg L−1) was reduced within 12 min. Importantly, the activity and structure of the photocatalyst were maintained after five cycling experiments, which demonstrates its advantageous stability. Finally, the photocatalytic mechanism is discussed in detail.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Yaping Cao,Hui Chen,Yupeng Shen,Mei Chen,Yelong Zhang,Lanying Zhang,Qian Wang,Shaojun Guo,Huai Yang
Potassium-ion batteries (KIBs) are emerging as the prospective alternatives to lithium-ion batteries in energy storage systems owing to the sufficient resources and relatively low cost of K-related materials. However, serious volume expansion and low specific capacity are found in most materials systems resulting from the large intrinsic radius of K+. Herein, SnS2 nanosheets anchored on nitrogen and sulfur co-doped MXene (SnS2 NSs/MXene) are creatively designed as advanced anode materials for KIBs. SnS2 NSs/MXene with a unique hierarchical structure can not only provide fast transmission channels for K+ but also avoid the accumulation of K+ and volume expansion. These novel features make SnS2 NSs/MXene electrodes exhibit a superior reversible specific capacity of 342.4 mA h g–1 under 50 mA g–1. Also, they maintain 206.1 mA h g–1 at an even higher current density of 0.5 A g–1 over 800 cycles almost without capacity decay. Moreover, the multistep alloying reaction mechanism of SnS2 NSs/MXene composites and K+ is revealed by the ex situ X-ray diffraction measurement. In addition, the density functional theory calculations confirm the existence of Ti–S bonds between SnS2 nanosheets and MXene, which significantly enhance the structural stability and cycling electrochemical performance of SnS2 NSs/MXene composites.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 16
·2938-2944
·
IF 3.545
Lijia Guo,Manying Liu,Yan Lei,Liwei Mi,Zhi Zheng
Inorganic perovskite CsPbBr3 is a suitable candidate owing to its excellent stability and outstanding visible light absorption. However, it is a huge challenge to fabricate single phase CsPbBr3 films. Herein, we developed an in situ metal reaction strategy to fabricate single phase CsPbBr3 films by reacting Pb precursors with CsBr/HBr in methanol solution. The thickness of the sputtered Pb film plays a key role in inhibiting the formation of a secondary CsPb2Br5 phase. The results indicate that the single phase CsPbBr3 films can be obtained by using below 40 nm of the sputtered Pb films, and the single phase CsPbBr3 device architecture exhibits 4.08% power conversion efficiency. This device can retain over 95% of the initial efficiency after 30 days of storage without packaging in an ambient environment.
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