SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Changwei Li,Zhefeng Gu,Songming Zhu,Dezhao Liu
This study evaluated the contribution of biotic and abiotic routes to the 17 β -estradiol (E2) removal in moving bed biofilm reactors (MBBRs), and uncovered the interrelation between the E2 removal routes and biofilm characteristics, which was not researched in previous literature. Three MBBRs with different C/N ratios (0 for C/N 0 ; 2 for C/N 2 ; and 5 for C/N 5 ) were operated in continuous mode. A 65-day degradation demonstrated that the MBBRs had high potential to remove E2 regardless of the C/N (E2 removal greater than 99% for all MBBRs; P > 0.05). Further batch tests showed that the E2 removal mainly resulted from heterotrophic activities for all MBBRs, accounting for approximately 85% for all MBBRs (P > 0.05), followed by nitrification (10–11%) and adsorption (4–5%). Importantly, lower adhesive force likely led to higher E2 adsorption onto biofilms. Besides, enhanced ammonia oxidizing rate (AOR) was consistent with the high contribution of nitrification to the E2 attenuation. Importantly, heterotrophic activity was positively correlated with its contribution to E2 removal (r = 0.99, P < 0.05). To sum, the results obtained in this study helped to understand the E2 removal routes in nitrifying biofilm systems.
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-9
·
IF 3.578
Liu Hongdong,Lin Ye,Zhang Lei
To overcome the deficiency of the volume expansion of MoS 2 as the anode material for lithium-ion batteries (LIBs), an effective strategy was developed to design hierarchical porous MoS 2 /carbon nanospheres via a facile, easy-operated hydrothermal method followed by annealing. FESEM and TEM images clearly showed that nanospheres are composed of ultra-thin MoS 2 /C nanosheets coated with carbon layer and possess an expanded interlayer spacing of 0.98 nm. As anodes for LIBs, MoS 2 /carbon nanospheres deliver an initial discharge capacity of 1307.77 mAh g −1 at a current density of 0.1 A g −1 . Moreover, a reversible capacity of 612 mAh g −1 was obtained even at 2 A g −1 and a capacity retention of 439 mAh g −1 after 500 cycles at 1 A g −1 . The improved electrochemical performance is ascribed to the hierarchical porous structure as well as the intercalation of carbon into lattice spacing of MoS 2 , which offers fast channels for ion/electron transport, relieves the influence of volume change and increases electrical conductivity of electrode. Meanwhile, the expanded interlayer spacing of MoS 2 in MoS 2 /C can decrease the ion diffusion resistance and alleviate the volumetric expansion during discharge/charge cycles.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 19
·10625-10637
·
IF 14.511
Kun Wang,Xiaobing Huang,Tao Zhou,Dan Sun,Haiyan Wang,Zhi Zhang
The NASICON-type Na4MnV(PO4)3 (NMVP) possesses potential as a cathode material in SIBs, and is known for its stable 3D Na+ superconductive framework, high voltage platform, and relatively low cost and toxicity. Nevertheless, the intrinsic poor electronic conductivity and Jahn–Teller effect from Mn3+ during cycling limit its further application. Herein, to address such issues, a well-designed 3D porous spheroidal Ce3+-doped NMVP@CeO2/C cathode was constructed via a simple spraying drying-assisted route. As proved, the synergistic effect of Ce3+ doping in the crystal framework and CeO2 surface coating was achieved simultaneously, which greatly improved the electronic conductivity, facilitated the ion diffusion transfer and stabilized the crystalline structure. As a result, the as-prepared sample delivered superior discharge performance (50.3 mA h g−1 at 50C) and long circular life (91.0 mA h g−1 after 2000 cycles at 5C with 86.7% capacity retention). Furthermore, the reversible biphasic reaction for cathodes was confirmed by Galvanostatic intermittent titration technique (GITT) and ex situ XRD. The DFT calculation revealed the influence of Ce3+-doping on the crystalline framework and electrochemical properties. Finally, the optimized NMVP cathode also showed great potential for practical utilization through the successful assembly of full cells.
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 14
·145704
·
IF 3.5
Jin Tan,Ling Lan,Yan-ni Wu,Song-bai Qiu
The graphene-like wrapped Ni@C catalysts were facilely synthesized by a modified sol–gel method. Nickel nitrate and citric acid (CA) were adopted as the raw materials to form sol–gel mixture. Under the circumstances, the additive CA were employed not only as a complexing agent but also as a carbon source. It is found that the calcination temperature and the mole ratios between Ni and CA are the key factors affecting the physical property and the catalytic performance of catalysts in the conversion of nitroarenes into corresponding anilines. The results show that the Ni@C-500(1:1) catalyst exhibited the best performance in the hydrogenation of o-chloronitrobenzenes (o-CNB) to o-chloroanilines (o-CAN). The yield of o-CAN was achieved at 100% when o-CNB was completely converted at 40.0 °C under 2.0 MPa H2 for 2.0 h. Furthermore, the Ni@C-500(1:1) catalyst could be separated and recovered easily after reaction by an external magnetic field. The investigated results indicate that the Ni@C-500(1:1) catalyst remained higher activity after using twelve times. More importantly, this kind of catalyst is also active for the selective hydrogenation of other nitroarenes into the corresponding anilines. This new synthetic method may pave a way for producing low-cost Ni@C catalysts on a large scale, which is attractive for industrial anilines applications.
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 11
·5375-5384
·
IF 2.394
Yongjia Li,Xu Ruhui,Wei Runhong,Zhang Hui,Wang Qianwen,Yao Yaochun
Through a shape-preserving carbonization process and a further activation process, the natural porous flour was carbonized to obtain flour-derived porous carbon (FPC) with abundant pores, and FPC was applied to silicon-porous carbon anode material and its electrochemical performance was evaluated. The results show that the optimal holding temperature of preparing FPC is 750 °C, and the optimal mass ratio amount of KOH/pre-C is 2. After 100 cycles at 0.1 A g −1 , the reversible capacity of FPC is only 291 mAh g −1 , while the reversible capacities of 30%-Si/FPC composite and 100%-Si are 771.34 mAh g −1 and 1241 mAh g −1 , respectively. Although 30%-Si/FPC composite displays only 62% of 100%-Si’s capacity, it shows good cycle stability, reduces the amount of nano silicon material and the application cost in lithium-ion batteries, and improves the utilization efficiency of nano silicon material. The application of flour-derived porous carbon will promote the development of Si/C anode materials.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Mingyang Tan,Liang Zhu,Hao Liu,Yajun Fu,Shuang-Feng Yin,Weijun Yang
A Cobalt porphyrin conjugated porous polymer (Co/PCP) was obtained by hybrid polymerization of a mixture of Co(II)(5,10,15,20-tetrakis(4-bromophenyl)-21H,23H-porphyrin) (CoTBPP) and 5,10,15,20-tetrakis(4-bromophenyl)-21H,23H-porphyrin (TBPP) (3:7 M ratio) with the coupling reagent of p-phenyldiboric acid. This Co/PCP was carbonized at 400 °C and the obtained catalyst (denoted as Co 3 O 4 @PNC-400) was composed of Co 3 O 4 nanoclusters wrapped in the nitrogen-carbon materials. This catalyst has an extremely high catalytic activity for the aerobic oxidation of C–H bonds. It can efficiently catalyze the oxidation of the C–H bonds in toluene and cyclohexane with high conversion and high selectivity of (alcohol + aldehyde), (alcohol + ketone) compounds, respectively. When heat-treated at 400 °C, the porous framework structure of the porphyrin polymer was partially retained, and the highly active Co 3 O 4 nanoclusters were generated in situ. The reaction of C N to C N and connection with the Co 3 O 4 nanoclusters also occurred. Co 3 O 4 @PNC-400 has obvious synergistic catalytic effect between Co 3 O 4 and nitrogen-carbon framework during the catalytic reaction. The defective structure caused by the migration of cobalt also greatly improved the catalytic activity. Co/PCPs with different cobalt contents were also synthesized and heat treated at different temperature. These catalysts were a new type of efficient C–H oxidation catalysts with excellent potential application value.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Fei Wang,Yefeng Liu,Ying Lv,Jun Ren,Ruixin Wang,Weizhou Jiao
Herein, the tungsten carbide (W 2 C) coated with the ultrathin carbon layer (W 2 C@C) was firstly exploited as an efficient and stable oxidative desulfurization (ODS) catalyst, which was prepared via annealing metallophthalocyanine/phosphotungstic acid composites at 800 °C under N 2 atmosphere. The Zn element in precursor markedly promoted the formation of the pure-phase W 2 C during annealing process. W 2 C@C showed a remarkable ODS performance with H 2 O 2 as oxidant under mild conditions. Dibenzothiophene (DBT) was100% removed by W 2 C@C within 40 min at 50 °C. The density functional theory (DFT) calculations combined with the radical scavenging experiments suggest that the ODS over W 2 C@C follows a non-radical mechanism that involves the facile formation of surface active oxygen species. Moreover, the W 2 C@C catalyst could be easily regenerated by solvent washing and recycled with no obvious loss of performance. Therefore, W 2 C could be firstly suggested as a promising catalyst for the ODS of liquid fuels.
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Zhimin Ren,Chao Chen,Xinxin Fu,Jia Wang,Chenyao Fan,Guodong Qian,Zhiyu Wang
Anatase TiO 2 /C composites nanorods were prepared via a simple internal-reflux approach under atmospheric pressure and subsequent carbonization. The oleic acid, which was used as the surfactant and carbon source, played an important role in synthesis and carbonization process. The TiO 2 /C nanorods prepared have high surface area and mesoporous structure, which are ascribed to the small diameter (2–4 nm) of nanorods and in situ formation of amorphous carbon , and both of those characters can improve the electrochemical property of TiO 2 /C electrode. The nanorods exhibit a high reversible capacity and improved capacity retention. The initial discharge capacity of TiO 2 /C composites is 411 mAhg −1 and still remains about 164.2 mAhg −1 after 50 cycles at a current of 177 mAg −1 , when used as anode materials for lithium ion batteries .
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Wei Zhao,Xunhui Xiong,Yingbang Yao,Bo Liang,Ye Fan,Shengguo Lu,Tao Tao
The construction of high capacity cathode materials consisting of two active components, LiFe x Mn 1-x PO 4 and Li 3 V 2 (PO 4 ) 3 , is rarely reported. Herein, 5LiFe 0.9 Mn 0.1 PO 4 ∙4Li 3 V 2 (PO 4 ) 3 /C (LFMVP/C) composites are synthesized by a simple two-step process, including ball milling and heat-treatment. The electrochemical reactivity of the composites with lithium is evaluated. The cathode assembled with LFMVP/C shows better electrochemical performance than that of the single active component (LiFePO 4 , LiMnPO 4, or Li 3 V 2 (PO 4 ) 3 ) during charging and discharging in the potential range of 2.4 and 4.8 V. It delivers the specific capacities of 195, 173, and 158 mAh∙g −1 at 0.1C, 0.5C, and 2C, and retains 88% of the initial discharge capacity after 100 cycles at 0.1 C. Compared with the single active component (LiFePO 4 , LiMnPO 4, or Li 3 V 2 (PO 4 ) 3 ), the lithium-ion diffusion coefficient of the composite composed of two active components (LFMVP/C) is higher.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jiajia Zhang,Fang Cui,Linxu Xu,Qinghai Ma,Yiwen Gao,Yang Liu,Tieyu Cui
Herein, a facial stratagem for the large-scale synthesis of NiO/C nanosheets used as magnetic adsorbents is proposed by using nanoscale coordination polymers (nanoCPs) as precursors. The NiO nanoparticles (NPs) scattered on the NiO/C nanosheets have an untrasmall size (~3 nm) as well as uniform dispersion, since the Ni 2+ ions are preassembled into the nanoCPs precursors by coordination bonds and transformed to NiO NPs in situ under the restriction of carbon layers. Thanks to the small size and spatially uniform distribution of NiO NPs , fully exposed carbon matrix containing part of graphene structures, and the high specific surface area of the special nanosheet structure, the magnetic NiO/C nanosheets have an a great breakthrough in the adsorption performance toward Congo Red (CR) among many reported NiO-based materials. The maximum adsorption capacity for CR is up to 2000 mg/g, and the adsorption kinetics and thermodynamics are also systematically studied. Moreover, the NiO/C nanosheets can be separated from water and reused simply by an external magnetic field. The NiO/C nanosheets with low cost and extraordinary adsorption ability have great potential in water pollution treatment area.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chong Wang,Gaoyu Chen,Juanrong Kou,Xianju Zhang,Xiangxing Xu,Jianchun Bao,Zihan Shen,Xin Jin,Huigang Zhang,Li Liu,Kehan Yu
Antimony (Sb) is a competitive candidate for lithium ion batteries (LIBs) as anode material because of its high theoretical discharge capacity (660 mAh/g). However, it remains a challenge caused by the volume change in the process of charge and discharge, which would damage the Sb anode that lead to poor rate performance and low cycle stability. Herein, we report the synthesis of Sb@S–N–C nanocomposite as the anode material to solve the problem. First, SbSI nanowires with diameter of ∼10 nm were synthesized. Then the SbSI nanowires were coated with polypyrrole (PPy) to form SbSI@PPy core-shell nanowires. By thermal reduction of SbSI@PPy, Sb@S–N–C nanocomposite was formed. Using the Sb@S–N–C nanocomposite as the anode material, a capacity of 536 mAh/g was obtained in 100 cycles at 0.5 A/g. Excitingly, it also exhibited superior reversible and long-cycle non-decay stability with the capacity of 342 mAh/g in 2000 cycles at a high current density of 1A/g.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Binbin Xu,Honglie Shen,Jiawei Ge,Quntao Tang
Silicon suboxide (SiO x ) is considered as one of the potential candidates for next-generation lithium-ion battery (LIB) anode materials. However, the application of this material is limited by volume change during the discharging and charging process and its low initial cycle Coulombic efficiency (ICE). Herein, we report a controllable and cost-effective route to synthesize the SiO x /MgO/Mg 2 SiO 4 /C (SMC) composite using magesiothermic reaction (MTR), hot-water treatment, and carbonization process. Moreover, the composite exhibits a hierarchical buffer structure composed of microspheres . Because of its special dehydration ability to disrupt the hydrolytic cycle, the introduction of MgO is proved to be beneficial to LIBs’ cycling performance and rate capability. Besides, with the formation of Mg 2 SiO 4 , the consumption of SiO 2 improves the ICE of the SMC anode to 87.48%. The hierarchical microstructure makes the resultant SMC anode exhibit a stable reversible capacity of 550 mAh g −1 , which means a high capacity retention ratio of 78.81% after 200 cycles. Furthermore, the specific capacity of SMC anode keeps around 600 mAh g −1 at the current density of 800 mA g −1 , showing superb rate performance. This work provides a novel approach to taking advantage of by-products of MTR and also demonstrates the potential of industrial application of SiO x /C anodes.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）