APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Shiyan Li,Hongquan Fu,Xingshuai Zhang,Xu Liu,Giulia Tuci,Giuliano Giambastiani,Cuong Pham-Huu,Yuefeng Liu
H 2 S selective oxidation to elemental sulfur (S 8 ) is a typical reaction where the mass product diffusion ( e.g ., S 8 ) through the catalytic bed is crucial as well as the reagents accessibility ( e.g ., H 2 S, O 2 ) to the active sites. The NaNO 3 -assisted pyrolysis of polyacrylamide was applied to synthesize defect-enriched N-doped carbon nanosheets with thickness up to c.a. 2 nm, featured by fully accessible and highly interconnected pores, for boosting the H 2 S selective oxidation process. The PAM-0.3-700 sample has revealed an unprecedented desulfurization activity with sulfur formation rate of 1165 g sulfur kg cat. −1 h −1 , other than a remarkable stability (>80 h). Experimental and theoretical studies have unveiled the critical role of edge sites containing unpaired electrons and nitrogen species with respect to the material aptitude towards O 2 dissociation and HS - activation. The material in presence of a highly interconnected porous network facilitates the reactants/product diffusion especially for catalysis operated under harsh experimental conditions.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 47
·22007-22016
·
IF 3.3
Yuxuan Zheng,Junping Zhao,Meifang Yan,Yuhua Gao,Haihua Li,Zhenfa Liu
Pudding-like Fe/C materials were successfully synthesized via an emulsion cross-linking method followed by a heat-treatment process. The morphologies and compositions can be easily controlled via adjusting the heat-treatment temperature. XRD, SEM, TEM, XPS, VSM, BET surface area measurements and zeta potential analysis were used to characterize the as-prepared samples. The adsorption capacity of MB (methylene blue) was systematically studied in different initial concentrations and pH of MB solution and at ambient temperature. Kinetics and isotherm synthesis were fitted well with the model of pseudo-second-order and Langmuir isotherms, respectively. The pudding-like Fe/C composites exhibited excellent adsorption performance in the removal of MB and the maximum adsorption capacity was 243.9 mg g−1, which was obtained for a 100 mg L−1 of MB solution at pH 7.0 and 25 °C. After ten cycles of adsorption experiments, the adsorption capacity can be maintained at about 93%, which indicated that the pudding-like Fe/C exhibited excellent adsorption stability and reusability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xinle Wang,Jin Chen,Yuzhao Ma,Jianye Shi,Yueying Wang,Xiaofeng Yang,Meidan Que,Yuxi Zhou,Yanjun Li
Two-dimensional (2D) transition metal carbide MXene (Ti 3 C 2 T x ) exhibits great potential in electromagnetic wave (EMW) absorbing materials due to its abundant surface functional groups and defects, tunable conductivity and high specific surface area. The Co@NC/TiO 2 /C composites were successfully synthesized through a solvothermal method and carbonization process using Ti 3 C 2 T x /Co-BTC as precursor. The incorporation of magnetic metal Co nanoparticles and Rutile-TiO 2 effectively addresses the issue of single loss mechanism in Ti 3 C 2 T x . The results show that CTC-100 exhibits excellent EMW absorption performance with a minimum reflection loss (RL) value of −51.3 dB at a thickness of only 1.48 mm, and the corresponding effective absorption bandwidth is (EAB, RL < −10 dB) 4.3 GHz. Simultaneously, by adjusting the matching thickness of the material from 1.29 mm to 5.0 mm, the EAB can achieve 15.42 GHz (from 2.85 GHz to 18 GHz). The excellent EMW absorption performance of CTC-100 composite is primarily attributed to the synergistic effect of magnetic loss and dielectric loss. This study provided an effective strategy for the design of Ti 3 C 2 T x -based EMW absorbing materials with high absorption intensity, reduced thickness, and broad effective absorption bandwidth (EAB).
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Kaibo Xu,Liqin Cao,Zhouyu Wang,Liu-ping Chen
Hemoperfusion (HP) is one of the most prominent therapies for treating uremia, hyperbilirubinemia, and acute drug toxicity. The comprehensive performance of currently used porous HP adsorbents needs to be improved due to the impediment to their synthesis strategy. Herein, green carbon dioxide-in-water high internal phase emulsions (C/W HIPEs) were utilized and emulsified with poly(vinyl alcohol) (PVA) for the formation of a heparin-mimetic chitosan oligosaccharides/poly(acrylamide-co-sodium 4-styrenesulfonate) [COS/P(AM-co-SSS)] monolith, which exhibited good mechanical properties, stable swelling performance, hydrophilic properties, anticoagulant effect, and low hemolysis. It showed a strong toxin adsorption capacity (415.2 mg/g for creatinine, 199.3 mg/g for urea, 279.5 mg/g for bilirubin, and 160 mg/g for tetracycline). The adsorption process of porous COS/P(AM-co-SSS) followed the pseudo-second-order kinetic and Langmuir isotherm models. Moreover, the porous materials had a strong electrostatic force on creatinine. The removal of creatinine by simulated in vitro blood perfusion was 80.2% within 30 min. This work provides a green preparation strategy for developing novel HP materials, highlighting their potential application value in blood and environmental purification.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Xiaoli Liu,Yanyi Fu,Qinglin Sheng,Jianbin Zheng
Herein, a simple electrochemical sensor for dopamine (DA) detection was developed based on Ag@C core-shell structure and Au nanocomposites (Ag@C/Au). The Ag@C core-shell nanoparticles were synthesized by one-pot hydrothermal method , which were supported on Au nanoparticles in situ reduction process. The as-prepared nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV–vis absorption spectra. The electrochemical investigations indicated that Ag@C/Au nanocomposites possessed intriguing properties towards DA. These results could be attributed to the synergistic effect of Ag@C with enhanced substrate accessibility and conductivity, Au nanoparticles with surface of negative charges. Under the optimum experimental conditions, the liner range was 0.5 μM to 27.5 μM, 27.5 μM to 0.2775 mM and 0.2775 mM to 4.278 mM. The detection limit was 0.21 μM (S/N = 3). Furthermore, the electrochemical sensor showed favorable selectivity in the presence of interferents such as ascorbic acid (AA) and uric acid (UA). In general, the work could provide a promising possibility to develop excellent electrochemical sensors for DA detection.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 39
·16188-16198
·
IF 6.7
Qingxue Lai,Hongmei Zheng,Wanying Zhang,Yi Sheng,Luanjie Nie,Jing Zheng
Fe–N–C catalysts with highly dispersed metal active centers were developed as promising non-precious metal materials for acidic oxygen reduction reaction (ORR) electrocatalysis. However, such kind of novel catalysts still suffer from major challenges in the manipulation of dispersion, utilization, and stability of the Fe-based metal centers. Herein, a N-rich molecular dual-guided pyrolysis strategy was proposed to develop an efficient yolk-shelled Fe–N–C ORR electrocatalyst. A unique yolk-shelled nanostructure with a relatively ordered shell and disordered yolk of a carbon skeleton was controllably constructed via this guided-pyrolysis route from the precursor of Fe-doped zeolitic imidazolate framework-8 (Fe-ZIF-8). Moreover, the atomic-level dispersion of Fe element in the carbon skeleton could be achieved via the dual guidance from phenanthroline and melamine molecules. The optimized Fe–N–C catalyst demonstrated a half-wave potential of 0.78 V vs. RHE in acid media, close to commercial 30% Pt/C, along with a small negative shift of 19 mV after an accelerated durability test. These enhanced electrocatalytic properties could be attributed to the preferred transformation of the Fe precursors to atomically dispersed Fe–Nx active configurations, as well as the enhanced three-phased interfacial reaction kinetics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Shuhui Fan,Yanan Hu,Tan Zhang,Qiang Zhao,Jinping Li,Guang Liu
The synthesis of ammonia via electrochemical nitrogen reduction reaction (NRR) provides an attractive alternative approach to the traditional Haber-Bosch process. In this regard, a one-step hydrothermal method was adopted to synthesize a bimetallic oxide， ferric molybdate (Fe 2 (MoO 4 ) 3 ), coated with carbon black on the surface (denoted as Fe 2 (MoO 4 ) 3 /C). The carbon black coating minimizes aggregation of Fe 2 (MoO 4 ) 3 , leading to increased electrochemical active sites for NRR. Additionally, this coating improves the electrical conductivity of Fe 2 (MoO 4 ) 3 thereby accelerating electron transfer between carbon black and Fe 2 (MoO 4 ) 3 , which is beneficial to charge transfer and enlarge the electrochemical active surface areas. At a potential of −0.4 V RHE (vs. reversible hydrogen electrode , RHE), the ammonia yield achieved was up to 51.76 μg h −1 mg cat −1 , with a Faradaic efficiency of 90.63% at −0.35V RHE . Impressively, this electrocatalyst exhibited excellent cycle stability and durability.
✓ 已验证
产品关联
DOI
高影响因子
APL Materials
·
2023
·Vol. 11
·期 10
·
IF 6.1
Li Xia,Deng Min,Cao Tingting,Ma Jun,Geng Shuo,Ren Yuan,Yao Mengqin,Liu Fei,Dong Yonggang
Formic acid (FA, HCOOH), as a liquid chemical hydrogen storage carrier with low cost, high hydrogen content, and convenient storage and transportation, has attracted extensive attention. Pd-based catalysts for hydrogen production from FA are easy to aggregate and deactivate in the reaction process, which hinders the further development of FA as a hydrogen storage carrier. Therefore, the exploitation of carriers with simple preparation methods and excellent performance can effectively improve the catalytic activity of Pd-based catalysts. Porous carbon and SiO 2 have been widely used for their unique structural properties, and the preparation of composite carriers by combining the advantages of both is a current research hotspot. Herein, this work synthesized C–SiO 2 for the deposition of Pd nanoparticles by a one-step method, and the obtained Pd/C–SiO 2 exhibits a superior FA dehydrogenation activity with a turnover frequency value of 1278 h −1 and a favorable stability with only a slight decrease in activity after five cycles.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 35
·16531-16538
·
IF 3.3
Yulong Zheng,Hui Zhang,Pei Han,Zhaoshun Zhang,Xueqin Zuo,Qun Yang,Huaibao Tang,Shaowei Jin,Guang Li
Solar distillation can directly produce clean water from non-potable water resources using solar energy and has great promise in desalination systems. However, the improvement of evaporation efficiency through the selection and optimization of suitable candidate materials is still a challenging problem. In this paper, by implementing a customized insulating floating layer and establishing an interfacial evaporation system, we have achieved a successful experiment demonstrating the potential to improve the efficacy of solar steam generation. This system is created by growing 1T-2H mixed-phase molybdenum disulfide composites on the carbonized ZIF8 surface. In this study, the treated composites were well integrated with the thermal insulating floating layer to achieve a stable interfacial structure for photothermal conversion. Furthermore, the cotton threads, known for their great absorbency, created an unhindered pathway for water flow, making it easier for steam to be generated and circulated. Using the above system, under one solar illumination condition, a significant evaporation rate of 1.57 kg m−2 h−1 was attained. The solar steam conversion efficiency of this interfacial heating system under one solar illumination condition was 94.4%. In addition to demonstrating that interface engineering is effective for solar steam production, this work offers a simple and economical water purification method.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jinglong Huang,Jie Qin,Qiufeng Meng,Lei Wang,Yong Du,Shirley Z. Shen
Due to the component advantages and structural features, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) based inorganic–organic composite films shows huge application potential in various fields. However, there are few reports on the bi-functions of thermoelectric (TE) and electromagnetic interference (EMI) shielding for the PEDOT:PSS-based functional films. Herein, metal–organic frameworks (MOFs)-derived Bi x Se y @C sheets with average size about ∼ 7.32 μm are obtained via the solvothermal reaction and selenization pyrolysis treatment, and then flexible free-standing Bi x Se y @C/PEDOT: PSS (BSCP) composite films are obtained by a feasible vacuum filtration combined with cold pressing treatment, using different contents of Bi x Se y @C content as inorganic component. Micrometer Bi x Se y @C sheets are uniformly dispersed in the PEDOT:PSS matrix constructing bi-functional composite films with unique layered structure. When the MOFs-derived Bi x Se y @C content is 70%, BSCP-70 composite film gets a power factor of 11.23 μW m −1 K −2 at 340 K. Meanwhile, the BSCP-70 composite film reaches the highest average total EMI shielding effectiveness (SE T ) value of 45.0 dB at only 41.9 μm thickness at X-band. Based on multi-physical properties of MOF-derived Bi x Se y @C and PEDOT:PSS, flexible Bi x Se y @C/PEDOT:PSS composite films display good application potentiality in the flexible TE devices and EMI shielding protection.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Chuanbin Wang,Yongxin Cheng,Sumeng Hu,Kejia Kang,Yuzhe Han,Xudan Zhang,Xiangping Dai,Guoqiang Luo
Tungsten (W)-based composites with 1 wt% SiC were consolidated via field assisted sintering (FAST). FAST was conducted at temperatures ranging from 1000 °C to 1700 °C with holding times of 1–10 min under a pressure of 50 MPa. The densification and grain growth mechanisms were investigated using a creep deformation model and the grain growth power law. Various densification and grain growth mechanisms corresponded to different effective stress exponents ( n ) and grain growth exponents ( p ). n is the stress exponent associated with the densification mechanism, and p is the grain growth exponent related to the grain growth mechanism. The densification process mainly occurred at 1000 °C–1400 °C, whereas grain growth mainly occurred at 1500 °C–1700 °C. The W-Si-C composites were densified primarily through particle rearrangement (when n is ∼1), intergranular diffusion (when n is ∼2), and the dislocation-climb mechanism (when n is 3.62). The activation energies were estimated to be 153.80 and 541.17 kJ/mol at the effective stress exponents ( n ) of 1 and 2, respectively. Furthermore, intergranular diffusion is speculated to cause grain growth. The sintering temperature considerably affected the microstructure of W-Si-C composites. The silicide formed at sintering temperatures of <1100 °C was WSi 2 , and it transformed into W 5 Si 3 with increasing sintering temperature.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 15
·5999-6008
·
IF 9.8
Yuanyuan Zhang,Wanxiang Zhang,Yan Wang,Shuhang Ren,Yucui Hou,Weize Wu
To reduce the emission of NO from fossil fuel combustion and the energy consumption associated with NH3 production, the development of simple and efficient methods to transform NO into high-value-added NH3 is essential. Here, we report the efficient catalytic hydrogenation of NO to NH3 under mild reaction conditions by the synergistic catalysis of functionalized ionic liquids (FILs) and Pd catalysts. In this system, an FIL [TEPA][Im] acted as both an absorbent and a catalyst. The presence of [TEPA][Im] enhanced the catalytic performance by changing the coordination and electronic environment of Pd on the Pd/C catalyst. First, NO was absorbed by [TEPA][Im]; then, the hydrogenation of absorbed NO to NH3 was performed at a low temperature via the synergistic catalyzation of [TEPA][Im] and Pd/C. The effects of various factors on NO hydrogenation to NH3 were also investigated. Remarkably, Pd/C exhibited outstanding properties in the formation of NH3 with a high yield of 67% in the FIL [TEPA][Im] under the conditions of 100 °C and an H2 pressure of 0.5 MPa. [TEPA][Im] could be reused multiple times and the product NH3 could be recovered by flashing.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）