SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Peng Zhang,Ji-Lai Gong,Guang-Ming Zeng,Biao Song,Siyuan Fang,Mi Zhang,Hong-Yu Liu,Shuang-Yan Huan,Ping Peng,Qiu-Ya Niu,Dong-Bo Wang,Jun Ye
In this work, a novel rGO/S-GO laminated membrane was prepared by a pressure-assembly stacked method, followed with a thermal deoxygenation process. The neighboring interlayer spacing ( d ) between the composite layers are tunable due to the incorporation of S-GO. The nano-filtration performances of the rGO/S-GO laminated membranes were evaluated at a low-pressure condition. Molecule dynamics (MD) simulation was used to further investigate the size distribution of spacing between GO, rGO and S-GO sheets. The results of filtration experiments indicated that the obtained rGO/S-GO membrane showed a satisfied rejection performance for the removal of dyes and salts with a pressure of two bar. The rejection rates of MB, CR, RB and MO were 99.5%, 99.9%, 97.3% and 98.6%, while the rejection rates of Na 2 SO 4 , MgSO 4 , MgCl 2 and NaCl were 86.3%, 40.9%, 35.7% and 60.5%, respectively. Compared to the pristine rGO membrane, the water permeation of rGO/S-GO laminated membrane was significantly improved from ∼0.98 to ∼3.78 L/(m 2 ·h·bar) due to the enlarged ‘gateway’ for transport of water molecules. The results of classical MD simulation showed that the neighboring layer spacing of rGO, GO and S-GO was ∼8.4, ∼10.2, and ∼14.3 Å, respectively. Their neighboring layer spacing was dependent on the chemical functional groups on the edges of GO sheets. It was further confirmed that the introduction of chemical groups on the GO caused the expansion of the interlayer ‘gap’ between neighboring sheets, which was responsible for the enhanced permeability. These findings would contribute to the development of GO-based nanofiltration membranes with high permeability and understanding the transport mechanism of water molecule.
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高影响因子
Smart Materials and Structures
·
2022
·Vol. 31
·期 3
·035035
·
IF 4.131
Shuai Yang,Yang He,Yanju Liu,Jinsong Leng
Here, a series of thermoplastic shape memory poly(aryl ether ketone)s (PAEKs) with programmable transition temperature were synthesized via a condensation polymerization reaction. The introduction of flexible segments and side groups onto PAEK main chains promoted the formation of the alternating rigid-flexible structures and the enhanced shape memory properties. The synthesized PAEKs exhibited the great thermal stability and strength which could greatly meet the demands in engineering applications. In addition, non-contact actuation of the shape memory behaviors of PAEKs was realized through the integration of Fe3O4 nanoparticles with magnetocaloric effect. More significantly, small-angle X-ray scattering analysis was utilized to reveal the transition of molecular chains and phase states during the stretching and heating processes. The change of internal structures and orientation of molecular chains during the deformation process might contribute to the regulation of shape memory behaviors. These studies on the fabrication of shape memory PAEKs with non-contact magnetic actuation performances and the investigation of their structural variation during the stretching and heating process were expected to open doors for the fabrication and investigation of new type of shape memory polymers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Wan-Yue Diao,Dan Xie,Dong-Lin Li,Fang-Yu Tao,Chang Liu,Hai-Zhu Sun,Xiao-Ying Zhang,Wen-Liang Li,Xing-Long Wu,Jing-Ping Zhang
Limited by the notorious Li dendrites growth and serious polysulfide shuttle effect, the development of lithium-sulfur (Li-S) batteries is stagnant. Herein, a multifunctional separator composed of Cu-based metal-organic framework (Cu-MOF) and Li-Nafion was proposed to address the above intractable issues. The Cu-MOF with homogeneous porous structure and abundant Lewis acidic sites not only promotes uniform Li + flux, but also exhibits a strong chemical interaction with polysulfides to inhibit the shuttle effect. Moreover, the narrow pore size distribution in the Cu-MOF and negatively charged gap endowed by the -SO 3 − groups both act as ion sieve to facilitate the passage of Li + and restrict the migration of polysulfide anions, synergistically mitigating the dendritic Li growth and polysulfides shuttling. As a result, the symmetric cell with MOF/Nafion separator achieves ultralong cycling stability (1000 h) and ultralow overpotential of 20 mV at a current density of 1.0 mA cm −2 . Importantly, in the assembled Li-S full battery, the modified PP separator presents the superior cycle stability with capacity retention of 90% after 300 cycles at 0.5 C. Current outcomes open up a new route to design functional separators with ion permselective for realizing the dendrite-free and high-performance Li-S battery.
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Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-9
·
IF 3.578
Zhang Xuzi,Shang Chaoqun,Wang Xin,Zhou Guofu
Co 9 S 8 is a potential anode material for its high sodium storage performance, easy accessibility, and thermostability. However, the volume expansion is a great hindrance to its development. Herein, a composite containing Co 9 S 8 nanofibers and hollow Co 9 S 8 nanospheres with N, S co-doped carbon layer (Co 9 S 8 @NSC) is successfully synthesized through a facile solvothermal process and a high-temperature carbonization. Ascribed to the carbon coating and the large specific surface area, severe volume stress can be effectively alleviated. In particular, with N and S heteroatoms introduced into the carbon layer, which is conducive to the Na + adsorption and diffusion on the carbon surface, Co 9 S 8 @NSC can perform more capacitive sodium storage mechanism. As a result, the electrode can exhibit a favorable reversible capacity of 226 mA h g −1 at 5 A g −1 and a favorable capacity retention of 83.1% at 1 A g −1 after 800 cycles. The unique design provides an innovative thought for enhancing the sodium storage performance.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Shun Yang,Zhigang Hao,Shaohua Zhang,Yanjun Gao,Xiangyang Li,Jiong Peng,Lijie Li,Xin Li
An exquisitely designed nanostructure and hybridizing with heteroatom-doped carbon can significantly improve the electrochemical performance of the transition metal sulfides (TMSs). Herein, three-dimensional (3D) hollow N, P, S codoped carbon (NPSC) shells encapsulated with uniformly dispersed cobalt sulfide nanoparticles (Co1–xS/HNPSCS) are synthesized for supercapacitors (SCs) by the sulfuration and carbonization of poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS)-functionalized cobalt-based zeolitic imidazolate framework-67 (ZIF-67). The PZS protects the ZIF-67 from collapsing and convert it in situ into NPSC shells, which are conducive to exposing abundant active sites and accelerating the kinetics of electrochemical reactions. As a result, the Co1–xS/HNPSCS presents an unrivaled specific capacity of 1058.9 C g–1 at 1 A g–1. The assembled Co1–xS/HNPSCS//AC hybrid SC (HSC) demonstrates a remarkable energy density of 57.8 W h kg–1 at a power density of 375 W kg–1. Density functional theory calculations show that the synergy between the Co1–xS and NPSC can optimize the electronic configuration, improve the conductivity, and enhance the adsorption of OH– on the surface of the electrode material. Besides, the quantum capacitance of the carbon layer is also increased by N, P, S codoping. This work exhibits an effective strategy to fabricate TMS/HNPSCS and offers theoretical and methodological guidance for the study of NPSC coating materials.
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CHEMBIOCHEM
·
2021
·Vol. 23
·期 5
·e202100589
·
IF 3.164
Yunfeng Cui,Liangyan Zhu,Xi Chen,Jinhui Feng,Qiaqing Wu,Dunming Zhu
Graphical Rational engineering of the carbonyl reductase PhADH resulted in a double mutant H93C/A139L, which enhanced the enantioselectivity toward the reduction of 3-cyclopentyl-3-ketopropanenitrile 1 a from 85 % to 99 %, as well as a 6-fold improvement in the specific activity. ( S )-3-Cyclopentyl-3-hydroxypropanenitrile (( S )- 1 b ) was prepared at 200 g/L (1.5 M) substrate concentration. ( S )-3-Cyclopentyl-3-hydroxypropanenitrile is the key precursor for the synthesis of ruxolitinib. The bioreduction of 3-cyclopentyl-3-ketopropanenitrile ( 1 a ) offers an attractive method to access this important compound. A carbonyl reductase (PhADH) from Paraburkholderia hospita catalyzed the reduction of 1 a giving the ( S )-alcohol ( 1 b ) with 85 % ee. Rational engineering of PhADH resulted in a double mutant H93C/A139L, which enhanced the enantioselectivity from 85 % to >98 %, as well as a 6.3-fold improvement in the specific activity. The bioreduction of 1 a was performed at 200 g/L (1.5 M) substrate concentration, leading to isolation of ( S )- 1 b in 91 % yield. Similarly, using this mutant enzyme, 3-cyclohexyl-3-ketopropanenitrile ( 2 a ) and 3-phenyl-3-ketopropanenitrile ( 3 a ) were reduced at high concentration affording the corresponding alcohols in >99 % ee, and 90 % and 92 % yield, respectively. The results showed that the variant H93C/A139L was a powerful biocatalyst for reduction of β-substituted-β-ketonitriles.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Yueqing Deng,Zhengji Zhou,Xin Zhang,Lei Cao,Wenhui Zhou,Dongxing Kou,Yafang Qi,Shengjie Yuan,Zhi Zheng,Sixin Wu
The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage ( V oc ) deficit. Recently, Sn Zn deep point defect and associative defect cluster have been recognized as the main culprit for the V oc losses. Therefore, manipulating the deep-level donor of Sn Zn antisite defects is crucial for breaking through the bottleneck of present Cu 2 ZnSn(S,Se) 4 (CZTSSe) photovoltaic technology. In this study, the Sn Zn deep traps in CZTSSe absorber layer are suppressed by incorporation of Ge. The energy levels and concentration of Sn Zn defects measured by deep-level transient spectroscopy (DLTS) decrease significantly. In addition, the grain growth of CZTSSe films is also promoted due to Ge implantation, yielding the high quality absorber layer. Consequently, the efficiency of CZTSSe solar cells increases from 9.15% to 11.48%, largely attributed to the 41 mV V oc increment.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Xiaomeng Gu,Taijie Chen,Jian Lei,Yang Yang,Xiuzhen Zheng,Sujuan Zhang,Qiushi Zhu,Xianliang Fu,Sugang Meng,Shifu Chen
To realize the high-efficiency photodegradation of antibiotics, a novel S-scheme heterojunction photocatalyst g-C 3 N 4 /Bi 8 (CrO 4 )O 11 was proposed and successfully prepared in this work. The 10% g-C 3 N 4 /Bi 8 (CrO 4 )O 11 heterojunction exhibits the highest degradation rate of norfloxacin (NOR) and bisphenol A (BPA). The degradation rate of NOR on 10% g-C 3 N 4 /Bi 8 (CrO 4 )O 11 is about 1.38 and 2.33 times higher than that of pure Bi 8 (CrO 4 )O 11 and g-C 3 N 4 , respectively. Further, the degradation rate of BPA over 10% g-C 3 N 4 /Bi 8 (CrO 4 )O 11 heterojunction is bout 1.35 and 9.11 times higher than that of pure Bi 8 (CrO 4 )O 11 and g-C 3 N 4 , respectively. The formation of S-scheme heterojunction facilitates the separation of photogenerated electron-hole pairs and reduces the recombination of charge carriers, which was confirmed by photocurrent, electrochemical impedance spectroscopy, steady-state and time-resolved transient photoluminescence spectrum, etc. The in-situ X-ray photoelectron spectroscopy, radical trapping experiments and electron paramagnetic resonance results demonstrate that the charge transfer is in accord with S-scheme mechanism.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 10
·103504
·
IF 3.9
Lu Chen,Qibin Tao,Lin Wang,Hao Lan,Qizhou Dai
In this study, a lead dioxide electrode co-modified with carbon microspheres and neodymium (CMS-Nd-PbO2) was prepared. The structural morphology and electrochemical properties of the four electrodes, PbO2, CMS-PbO2, Nd-PbO2, and CMS-Nd-PbO2, were compared by field emission scanning electron microscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance, respectively. The results showed that the prepared CMS-Nd-PbO2 electrode had higher surface denseness and higher electrode activity. Based on the accelerated lifetime experiment, the actual working life of four electrodes was studied, and the CMS-Nd-PbO2 electrode had a relatively long lifetime, increased 24.60% compared with the PbO2 electrode. The influencing parameters of electrochemical degradation of bisphenol S (BPS) by CMS-Nd-PbO2 electrode, the ability of different electrodes to generate hydroxyl radicals, reaction mechanism, and the possible BPS degradation pathways were also discussed. Further, the safety of the prepared electrode was evaluated. Under the optimal parameters, the removal rate of BPS and chemical oxygen demand (COD) were 96.49% and 51.84%, respectively. The dissolved lead ion concentration in the solution after electrochemical oxidation was lower than the WHO standard. The CMS-Nd-PbO2 electrode showed promising applications in the degradation of emerging contaminants wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shangding Yang,Xiaoke Yan,Shitai Shen,Li Wu,Bolin Li,Liuyang He,Lijuan Wu,Zulin Zhang,Lie Yang
Although advanced reduction processes (ARPs) based on UV/S(IV) (UV/sulfite) processes could achieve higher dechlorination and degradation efficiencies for organic pollutants , the mineralization and detoxification efficiencies still need to be further improved. In this study, post-reoxygenation was employed to improve the mineralization and detoxification of chloramphenicol (CAP) in UV/S(IV)-ARPs. The effects of initial pH and aeration rate on the dechlorination and mineralization efficiency of CAP were investigated. At the optimized conditions (pH 3.0, aeration rate of 0.3 L min −1 ), 92.75 % of dechlorination efficiency and 29.3 % of COD removal were obtained after 2 h of reoxygenation. Meanwhile, the effects of inorganic anions (Cl - , SO 4 2- , HCO 3 – , NO 3 – , and HPO 4 2- ) on the removal of COD and dechlorination efficiency were also evaluated. Furthermore, the electron paramagnetic resonance analysis disclosed that SO 4 •- and HO • mainly contributed to the mineralization of CAP. Further degradation and mineralization of CAP were confirmed in the post-reoxygenation UV/S(IV)-ARPs (PRO-UV/S(IV)-ARPs) and the intermediates were identified. The ecotoxicity prediction and residual toxicity assessment revealed that the ecotoxicity of CAP solution was significantly reduced after the treatment of post-reoxygenation. Overall, the PRO-UV/S(IV)-ARPs provides a promising choice with straightforward operation for the purification and detoxification of CAP wastewater.
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Small
·
2022
·Vol. 18
·期 31
·2202544
·
IF 15.153
Yichao Wang,Meijie Liu,Chunxu Wu,Jiapeng Gao,Min Li,Zipeng Xing,Zhenzi Li,Wei Zhou
Major issues in photocatalysis include improving charge carrier separation efficiency at the interface of semiconductor photocatalysts and rationally developing efficient hierarchical heterostructures. Surface continuous growth deposition is used to make hollow Cu 2-x S nanoboxes, and then simple hydrothermal reaction is used to make core-shell Cu 2-x S@ZnIn 2 S 4 S-scheme heterojunctions. The photothermal and photocatalytic performance of Cu 2-x S@ZnIn 2 S 4 is improved. In an experimental hydrogen production test, the Cu 2-x S@ZnIn 2 S 4 photocatalyst produces 4653.43 µmol h −1 g −1 of hydrogen, which is 137.6 and 13.8 times higher than pure Cu 2-x S and ZnIn 2 S 4 , respectively. Furthermore, the photocatalyst exhibits a high tetracycline degradation efficiency in the water of up to 98.8%. For photocatalytic reactions, the hollow core-shell configuration gives a large specific surface area and more reactive sites. The photocatalytic response range is broadened, infrared light absorption enhanced, the photothermal effect is outstanding, and the photocatalytic process is promoted. Meanwhile, characterizations, degradation studies, active species trapping investigations, energy band structure analysis, and theoretical calculations all reveal that the S-scheme heterojunction can efficiently increase photogenerated carrier separation. This research opens up new possibilities for future S-scheme heterojunction catalyst design and development.
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高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Bin Xu,Chuanhe Ma,Xiaoshuang Lu,Yulin Liu,Qiao Zhang,Ye Chen,Pingxiong Yang,Junhao Chu,Lin Sun
Cu 2 ZnSn(S,Se) 4 (CZTSSe) has received considerable attention as the promising absorber for thin-film solar cells. For traditional selenization process, the issues of Sn-loss, lower S/(S + Se) ratio, and unsuitable back contact interface extensively exist in CZTSSe solar cells. In present work, SnSe and SnS powder is introduced during selenization process, respectively. The effects of SnSe and SnS powder on CZTSSe films and the Mo/CZTSSe interface have been comprehensively studied. We discover that SnS not only can provide the Sn-contained vapor in selenization process but also offer S-vapor. Due to the presence of Sn-contained vapor, the number of voids in the CZTSSe absorber and Mo/CZTSSe interface decreases remarkably and the Sn-loss is effectively suppressed. The thickness of Mo(S,Se) 2 layer is significantly reduced, and the S/(S + Se) ratio in CZTSSe bulk obviously increases owing to the presence of S-vapor. As a consequence, the open-circuit voltage and fill factor of the solar cell significantly increase and the CZTSSe solar cell with efficiency of 10.07% (total area) is successfully fabricated.
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高影响因子
危险品化学品经营许可证（带存储）