RARE METALS
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2021
·Vol. 40
·期 12
·3554-3560
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IF 4.003
Liu Wen-Wen,Pan Jun,Peng Ren-Fu
The shape-dependent performance of metal co-catalysts in photocatalysis has been one of the research focal points in recent years. In this study, PtPd/C 3 N 4 hybrid structures were constructed to reveal the effect of the shape of the PtPd bimetallic co-catalyst on the performance of photocatalytic hydrogen generation. PtPd nanocubes (NCs) and nanotetrahedrons (NTs) were sequentially deposited in situ on the surface of C 3 N 4 nanosheets, establishing a strong contact interface to ensure the smooth transfer of photoinduced electrons. Ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy and photoelectrochemical experiments revealed that the PtPd NCs/C 3 N 4 photocatalyst had comparable light absorption ability and equivalent carrier separation and transfer efficiency in comparison with the PtPd NTs/C 3 N 4 photocatalyst, which excluded the influence of these factors on shape-dependent performance. The photocatalytic hydrogen generation results indicate that the hydrogen generation rate of the PtPd NCs/C 3 N 4 photocatalyst is 1.33 times higher than that of the PtPd NTs/C 3 N 4 photocatalyst, demonstrating that the cubic PtPd bimetallic co-catalyst is more conducive to hydrogen generation compared to the tetrahedral PtPd bimetallic co-catalyst. Graphical abstract
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APPLIED CLAY SCIENCE
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2021
·
IF 5.467
Atian Xie,Jiuyun Cui,Jin Yang,Chunxiang Li,Yi Wang,Jiangdong Dai
The effective treatment of oily wastewater is of great significance for the protection of the ecological environment and human health. Aiming to prepare a membrane with excellent antifouling properties, a new active antifouling carbon cloth@Ni-Co LDH/Ag (CC@LDH/Ag) membrane was reported here via in situ hydrothermal growth and followed photo-deposition methods. The effects of Ag deposition on self-cleaning ability and surface wettability of CC@LDH/Ag membrane were studied. The experimental results showed CC@LDH/Ag membrane is superhydrophilic/underwater superoleophobic, and exhibited high separation efficiency (>98.6%) and high flux (6551–22,050 L m −2 h −1 ) for different kinds of oil/water mixtures. Moreover, CC@LDH/Ag membrane also displayed excellent environmental and mechanical durability. Good self-cleaning ability enabled CC@LDH/Ag membrane to be separated at least 30 times, and still maintained high separation performance. The self-cleaning CC@LDH/Ag membrane may hold great application prospects in oily wastewater remediation.
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ACS Catalysis
·
2021
·
IF 13.084
Muhong Li,Shanyong Chen,Qike Jiang,Qingliang Chen,Xuan Wang,Yong Yan,Jian Liu,Changchang Lv,Weiping Ding,Xuefeng Guo
The production of functionalized anilines by chemoselective hydrogenation of nitroarenes occupies an important position in the chemical industries. Recently, cobalt and nitrogen codoped carbon (Co–N–C) catalysts have been reported to show outstanding catalytic performance in this process, whereas the nature of their active sites is still at the center of intense debate. In this paper, based on the well-controlled experiments on four types of typical Co–N–C materials derived from different methodologies, several unusual generalities in the hydrogenation of nitroarenes are clearly revealed, including protic-solvent dependence, antipoisoning, acid resistance, and reversible deactivation. Further investigations indicate that the single-atom species Co–Nx are the main active sites of the Co–N–C catalysts in this chemoselective hydrogenation process. The present work sheds light on the mechanism study on the metal–N–C catalysts and further contributes to the rational design of the high-performance single-atom catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Quanyun Ye,Jiayan Wu,Pingxiao Wu,Saeed Rehman,Zubair Ahmed,Nengwu Zhu
Efficient and low-cost catalysts for peroxymonosulfate (PMS) activation are needed for pollution prevention and environmental remediation. In this work, PMS activation by CoFe layered double hydroxide (CoFe-LDH) was promoted by compositing with biochar (BC). The characterization and catalytic performance of BC, CoFe-LDH, and BC@CoFe-LDH composite (BC-LDH) were investigated. The results indicated that BC could act as a catalyst carrier and electron mediator, which improved the physicochemical properties of CoFe-LDH and promoted the redox cycle of transition metals. The redox-active moieties (RAMs) of BC, especially the reduced functional groups (e.g., phenolic –OH), played an important role in the reduction of Co(III) and Fe(III). Remarkably, benefiting from the synergistic effect between BC and CoFe-LDH, the resulting BC-LDH exhibited excellent catalytic activity and stability for PMS activation. More reactive oxygen species (ROS) were produced in BC-LDH/PMS system. As a result, 100% of dimethyl phthalate (DMP, 10 mg L −1 ) degradation efficiency was achieved within 60 min in BC-LDH/PMS system, while only 62% in CoFe-LDH/PMS system. The intermediates of DMP degradation were identified and the degradation pathways were proposed. Our findings are expected to provide new insights into the rational design and application of BC materials and transition metals/PMS system for environmental remediation.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 9
·2006-2015
·
IF 3.545
Ping Zhong,Kun Wang,Xingchao Wang,Zhenjiang Lu,Jing Xie,Yali Cao
Developing carbon-based nanomaterials with high capacity and stable structure as anode materials is of great significance for practical application in electronic devices. Herein, we report a facile self-template strategy to prepare hollow porous nitrogen-doped carbon embedded with ultrafine Co nanoparticles (Co@NC) based on the abundant hydroxyl functional groups on the surface of polydopamine (PDA) that can effectively anchor metal ions. The unique hollow porous structure affords large surface areas, adequate internal void space and short ion transport channels. Ultrafine Co nanoparticles embedded into hollow porous nitrogen-doped carbon offer good electronic conductivity and provide rich active sites for lithium ion adsorption (pseudocapacitance behavior) through electron transfer from metal to carbon. As the anode, Co@NC exhibited excellent cycling stability (627.5 mA h g−1 after 300 cycles at 0.5 A g−1) and remarkable rate performance (233.6 mA h g−1 at 5 A g−1). Benefiting from the unique design of the structure, Co@NC manifested a prospective anode material for stable, safe and high capacity lithium storage. Our work provides an effective strategy to synthesize hollow porous carbon embedded with ultrafine Co nanoparticles for enhancing the electrochemical performance of lithium-ion batteries.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Zhiyan He,Guangxing Yang,Hongjuan Wang,Fengying Dai,Feng Peng,Hao Yu
Metal- and nitrogen-doped carbon materials (Me–N–C) have received intensive scientific interest as single-atom catalysts (SACs) for electro- and thermocatalytic reactions. In this work, the potential of Me–N–C (Me = Co, Fe, Ni)-wrapped carbon nanotubes (CNTs) as support of platinum nanoparticles (Pt NPs) for base-free oxidation of glycerol was investigated. Co-doping of transition metal and nitrogen significantly enhanced the dispersion of Pt, indicating the advantages of the supporting material for noble-metal catalysts. Two-fold improvement of turnover of glycerol was observed over 5Pt/CoNC@CNT compared to 5Pt/CNT under the same reaction conditions. A kinetics study was conducted to understand the role of CoNC as a support of Pt NPs in a wide range of oxygen partial pressure from 0.04 to 0.4 MPa and a range of glycerol concentration from 0.012 to 0.15 wt %. A synergistic effect between Me–N–C, especially Co–N–C, and Pt NPs was revealed. The Co–N–C support facilitated the activation of oxygen and thus enhanced the overall turnover of glycerol oxidation, especially at high glycerol concentrations. This finding suggests a new approach to the high-performance Pt catalysts via introducing SACs as supporting materials that afford auxiliary active sites for the target reaction.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 45
·期 4
·6227-6238
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IF 3.741
Xiangxiang Du,Xuejun Shi,Yanling Li,Kesheng Cao
Summary Herein, N, S-co-doped graphene hydrogel (N/SGH) was first prepared by one-pot feasible hydrothermal approach using thiourea as a dopant for both N and S sources. And then, polyaniline (PANI) was grown on the surface of N, S-co-doped graphene hydrogel via simple adsorption of aniline monomer and in situ polymerization process. The N, S-co-doped graphene/polyaniline (N/SGH/PANI) composite hydrogel was fabricated as a free-standing and binder-free electrode material. Due to the co-doped synergistic effect, the N/SGH electrode exhibited enhanced electrochemical performances. The N/SGH electrode displays a specific capacitance of 130.4 F/g at 0.5 A/g. Compared with pure graphene hydrogel (GH), the specific capacitance of N/SGH and N-doped graphene (NGH) electrodes at 0.5 A/g increased by 53% and 20%, respectively. PANI pseudocapacitor material was introduced to further improve its capacitive performance. The resultant N/SGH/PANI composite electrode could achieve a max specific capacitance of 236.5 F/g at 0.5 A/g. In addition, N/SGH/PANI composite electrode showed stable cycle performance with the capacity retention of 95.1% after 1000 cycles performed at 10 A/g. Those provide a fabrication strategy for the design of high-performance supercapacitors electrode materials.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Junqing Chang,Mati Horprathum,Dianhui Wang,Gang Meng,Zanhong Deng,Bin Tong,Pinit Kidkhunthod,Tiantian Dai,Meng Li,Hongyu Liu,Wei Tong,Shimao Wang,Xiaodong Fang
Though p-type NiO possesses excellent catalytic oxidation property toward volatile organic compounds (VOCs), intrinsic low sensitivity of NiO (arising from the hole accumulation layer configuration in ambient air atmosphere sensor) restricts its promising applications in VOCs detection. In this study, Sc and Li were proposed to modulate the (surface) properties of NiO nanosheet-flowers based sensors. At the optimal 2 at.% Sc and 5 at.% Li doping ratio (Ni 0.93 Sc 0.02 Li 0.05 O), the sensitivity to 100 ppm ethanol is 118.4 (105 times higher than that of pure NiO), which is comparable to or even higher than most of reported NiO based sensors. Moreover, Ni 0.93 Sc 0.02 Li 0.05 O sensor exhibits a low detection limit of 10 ppb, excellent repeatability and long-term stability (∼30 % decline of response after 7 months). Apart from regulating the carrier concentration, defect characterizations indicate a noticeable increase of stabilized surface oxygen vacancy (O V ) defects and Ni 3+ cations by Sc 3+ and Li + co-doping, which greatly facilitate the adsorption of VOCs molecule (revealed by density functional theory calculation) as well as the subsequent VOCs/NiO interfacial charge interaction, thus contribute to the superior sensing performances. This work demonstrates that co-doping offers an effective avenue for boosting the performances of (p-type) oxide sensors.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 48
·21085-21091
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IF 3.288
Hongli Zhu,Jing Huang,Huijun Chen,Xiaomiao Feng
In recent years, self-propelled micromotors have attracted great attention due to their intelligent properties. To obtain a bubble-propelled micromotor, additional catalysts are required, which are usually expensive, toxic, and unstable, and lead to uncontrolled motion. To overcome these limits, ZIF-67, as a kind of MOF material, was chosen as a micromotor precursor; porous carbon decorated with magnetic Co nanocomposites (Co@PCs) could be obtained via an annealing process involving ZIF-67. These Co@PCs were used as micromotors for drug delivery, and were mass-producible, stable, and biocompatible. Due to the presence of magnetic Co, their motion could be controlled in a magnetic field. Co@PCs carbonized at 600 °C were self-propelled at a speed of 27.68 μm s−1, which corresponded to a relative speed of about 7.92 body-lengths s−1 at a fuel concentration of 5% with a lifetime of about 60 minutes. Furthermore, Co@PCs could be used as nanocarriers for the loading and release of the anticancer drug doxorubicin.
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MATERIALS & DESIGN
·
2020
·
IF 6.289
Guoyong Wang,Guowen Qian,Jun Zan,Fangwei Qi,Zhengyu Zhao,Wengjing Yang,Shuping Peng,Cijun Shuai
Poly l-lactic acid (PLLA) was limited in the further orthopaedic application due to its insufficient mechanical property and poor bioactivity. Graphene oxide (GO) is an effective reinforcement, whereas silicon-doped hydroxyapatite (Si-HA) possesses excellent bioactivity, but either GO or Si-HA tends to aggregate in PLLA matrix. In this study, a [email protected] nanosystem was achieved by in-situ growth of Si-HA on GO, and then incorporated into PLLA scaffold fabricated by laser sintering technology. On one hand, Si-HA on the surface of GO effectively prevented the aggregation of GO by acting as a barrier between GO nanosheets. On the other hand, GO hindered the aggregation of Si-HA by means of anchoring Si-HA. Results displayed that the compressive strength and modulus of the PLLA/ [email protected] composite scaffold were enhanced by 85% and 120%, respectively. Meanwhile, the scaffold exhibited significantly improved bioactivity, and consequently promoted cell adhesion, proliferation and differentiation. The developed PLLA/ [email protected] composite scaffold with excellent mechanical properties and superior bioactivity could serve as a promising substitute for bone repairing.
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EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Ang Shen,Guohua Wang,Jinggang Wang,Xiaoqin Zhang,Xuan Fei,Lin Fan,Jin Zhu,Xiaoqing Liu
Poly(1,4-butylene- co -1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PBCFs) was synthesized from bio-based 2,5-furandicarboxylic acid (FDCA), 1,4-butanediol (BDO) and 1,4-cyclohexanedimethanol (CHDM). The GPC showed that the number average molecular weight ( M n ) of PBCFs were in the range of 38400–44200 g/mol and the average molecular weight ( M w ) varied from 83,000 to 94,800 g/mol with the polydispersity index of 2.22–2.33. The chemical structures, compositions and sequence distributions of PBCFs were confirmed by 1 H NMR and 13 C NMR. Their thermal properties and crystallization behavior were investigated by Differential Scanning Calorimeter (DSC). Results showed that the glass transition temperature ( T g ) and melting temperature ( T m ) of poly(butylene 2,5-furandicarboxylate) (PBF) were increased from 38 and 171.8 °C to 65.8 and 211.7 °C for PBCF-68, respectively. Furthermore, the strength and modulus were increased from 44 and 950 MPa for PBF to 69 and 1360 MPa for PBCF-68 with the mole percentage of CHDM units of 68% in diol units. PBCFs demonstrated much better thermo-mechanical properties when compared with those of PBF, which might be used as the bio-based engineering plastic or excellent packaging materials with high transparency and good gas barrier properties.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Xueqing Guo,Yang Liu,Wenjuan Dong,Qin Hu,Yong Li,Shaomin Shuang,Chuan Dong,Lishuai Cai,Xiaojuan Gong
Azithromycin (AZM) 1 is one of the most widely used antibiotics. AZM abuse is easy to cause great harm to human body, so developing a rapid and sensitive method to detect AZM is of great importance. Herein, 3-aminothiophenol as only reaction precursor, nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) 2 were fabricated by one-step hydrothermal carbonization method. All characteristics demonstrate that N,S-CQDs possess good water solubility, high fluorescence stability and low cytotoxicity. Without being disturbed by amino acids and drugs, the most interesting finding is that AZM can efficiently quench the fluorescence of N,S-CQDs by a synergistic effect of electrostatic interaction and static quenching. A fluorescent probe for the detection of AZM was constructed with high selectivity and good sensitivity, achieving two linear ranges of 2.5–32.3 μM and 37.2–110 μM and a limit of detection of 0.76 µM. The proposed fluorescent method was used for the detection of AZM in cells with fulfilling results. More importantly, the fluorescent probe was successfully used to the detection of AZM in tablets and human urine with recovery rate and relative standard deviations of 98.2–104.8% and 0.04–3.46%, respectively, which was confirmed by the standard method of HPLC-UV. This finding illustrates the usefulness and feasibility of N,S-CQDs as an effective fluorescent probe for the detection of AZM in tablets and human urine, which is helpful for supervising and guiding pharmacy.
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PubMed
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