JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Shenjun Wang,Xiaonan Tan,Yuhao Wu,Jun Zhang,Zhiyuan Tian,Jiahai Ma
Rapid isolation of microplastics is the prerequisite for correct and in-depth understanding of their environmental impacts and human health threats. And Fenton’s reagent (Fe/H 2 O 2 system, FHS) has been proven to be a viable way to isolate microplastics from wastewater, but it is limited because of harsh reaction conditions, long reaction time and low efficiency. Herein, it's proven that the Fenton-like system, which is using Cobalt (II) salts to decompose potassium peroxymonosulfate (Co/PMS system, CPS) with generation of 1 O 2 , can offer shorter time (within 30 min) in complex sample isolation. The experimental results showed that the isolation time of micro/nanoplastics from pollutants with CPS in only 30 min, while it was at least more than 5 h with FHS. Via a serious of experiments of comparison and characterization between FHS and CPS, whether from the point of view of reaction time or isolation effect , CPS is superior to FHS. On this basis, we validate the applicability of this system (CPS) in different reaction conditions (concentration, pH), different sizes (from microns to nanometers) and types of plastic (PS, PA, PE, PP, PVC). In addition, the CPS can also preserve the integrity of the plastic itself and reduce the impact on the quality of samples evidenced by a variety of characterization of physicochemical structure like UV–vis, TEM, AFM , FTIR and XPS. CPS is proved to be faster, higher, stronger for enhancing the isolation of micro/nanoplastics from complex matrix. In a word, this study provides a promising solution for the efficient isolation of microplastics from wastewater without causing additional harm to the plastics.
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高影响因子
NPG Asia Materials
·
2023
·Vol. 15
·期 1
·1-8
·
IF 9.7
Dong Yangbo,Feng Danyang,Li Wei,Zhang Rui,Dou Shuzhen,Wang Luoqi,Yang Yan,Wang Li,Yang Yang,Wei Feng,Qiao Zhen-An
Gradient porous structures enable the fast capillary-directed mass transport and enhance the chemical reaction rate with optimal efficiency and minimal energy consumption. Rational design and facile synthesis of functional mesoporous materials with sheet structure and gradient mesopores still face challenges of stacked structures and unadjustable pore sizes. Herein, an interfacial co-assembly strategy for gradient mesoporous hollow silica sheets is reported. The modulated oil-water interface allows the assembly of gradient mesoporous silica layers on the water-removable ammonium sulfate crystals. The obtained mesoporous silica layers possess narrow pore size distributions (~2.2 nm and ~6.6 nm). Owing to the good mono-dispersity, sheet structure and proper pore size, the designed gradient mesoporous hollow silica sheets can serve as flexible building blocks for fabricating nanoscale molecule filtration device. Experiments reveal that the obtained nanofiltration device shows remarkable gradient rejection rates (range from 23.5 to 99.9%) for molecules with different sizes (range from 1.2 to 4.4 nm).
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FUEL
·
2023
·
IF 7.4
Yuxin Sun,Yunshuo Wu,Yarong Bai,Xuanhao Wu,Haiqiang Wang,Zhongbiao Wu
Iridium nanocatalysts are ideal candidates for the selective catalytic reduction of NO x by CO (CO-SCR) in excess oxygen. Here, a high-performance Ir nanocatalyst supported on natural halloysite nanotubes (HNTs) was applied for the CO-SCR. The HNTs loaded with only 0.5 wt% Ir achieved 78 % NO x conversion at 250 °C in the presence of 5 % O 2 , which was the highest among catalysts with varied Ir loadings or reduction temperatures. It also possessed an excellent SO 2 and H 2 O tolerance during longevity tests. An interesting SO 2 -enhanced CO-SCR long-term stability was observed, which was ascribed to the inhibitory effects of SO 2 on the side reaction between CO and O 2 . The loading amount and the reduction temperature could modulate the size of Ir nanoparticles and the percent of Ir 0 , which were two key factors determining the CO-SCR activity. DRIFTS characterizations and DFT calculations coherently revealed the favorable adsorption sites of CO (top) and NO (hcp) on Ir nanoparticles. The Ir atoms served as a charge transfer bridge from the C atom of CO to the N atom of NO, leading to the enhanced breakage of N-O bonds. This work provides Ir/HNT as a promising CO-SCR material with high performance and robustness to tackle NO x pollution.
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Journal of the American Chemical Society
·
2023
·
IF 15
Zhi-Zheng Wu,Xiao-Long Zhang,Peng-Peng Yang,Zhuang-Zhuang Niu,Fei-Yue Gao,Yu-Cai Zhang,Li-Ping Chi,Shu-Ping Sun,Jing-Wen DuanMu,Pu-Gan Lu,Ye-Cheng Li,Min-Rui Gao
Carbon–carbon coupling electrochemistry on a conventional copper (Cu) catalyst still undergoes low selectivity among many different multicarbon (C2+) chemicals, posing a grand challenge to achieve a single C2+ product. Here, we demonstrate a laser irradiation synthesis of a gerhardtite mineral, Cu2(OH)3NO3, as a catalyst precursor to make a Cu catalyst with abundant stacking faults under reducing conditions. Such structural perturbation modulates electronic microenvironments of Cu, leading to improved d-electron back-donation to the antibonding orbital of *CO intermediates and thus strengthening *CO adsorption. With increased *CO coverage on the defect-rich Cu, we report an acetate selectivity of 56 ± 2% (compared to 31 ± 1% for conventional Cu) and a partial current density of 222 ± 7 mA per square centimeter in CO electroreduction. When run at 400 mA per square centimeter for 40 h in a flow reactor, this catalyst produces 68.3 mmol of acetate throughout. This work highlights the value of a Cu-containing mineral phase in accessing suitable structures for improved selectivity to a single desired C2+ product.
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高影响因子
Fashion and Textiles
·
2021
·Vol. 8
·期 1
·1-12
·
IF 2.2
Chen Yuanli,Fan Hui,Zha Xinlin,Wang Wenwen,Wu Yi,Xiong Yi,Yan Kun,Wang Yuedan,Wang Dong
High efficiency and anti-pollution oil/water separation membrane has been widely explored and researched. There are a large number of hydroxyl groups on the surface of silica, which has good wettability and can be used for oil-water separation membranes. Hydrophilic silica nanostructures with different morphologies were synthesized by changing templates and contents of trimethylbenzene (TMB). Here, silica nanospheres with radical pores, hollow silica nanospheres and worm-like silica nanotubes were separately sprayed on the PVA -co- PE nanofiber membrane (PM). The abundance of hydroxyl groups and porous structures on PM surfaces enabled the absorption of silica nanospheres through hydrogen bonds. Compared with different silica nanostructures, it was found that the silica/PM exhibited excellent super-hydrophilicity in air and underwater “oil-hating” properties. The PM was mass-produced in our lab through melt-extrusion-phase-separation technique. Therefore, the obtained membranes not only have excellent underwater superoleophobicity but also have a low-cost production. The prepared silica/PM composites were used to separate n-hexane/water, silicone oil/water and peanut oil water mixtures via filtration. As a result, they all exhibited efficient separation of oil/water mixture through gravity-driven filtration.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiangdong Kong,Jingwen Ke,Zhiqiang Wang,Yan Liu,Yibo Wang,Weiran Zhou,Zhengwu Yang,Wensheng Yan,Zhigang Geng,Jie Zeng
A typical mode of CO 2 activation is that d electrons at the d orbital of transition metals transfer to the unoccupied π * orbital of CO 2 . Thus the exploration of the relationship between d -electron behaviors and CO 2 activation is of great importance. Herein, we demonstrate that high-spin state of 3 d electrons in Co 2+ facilitated the activation of CO 2 over Co-salophen-X (X represents to Cl, Br, or I). Among these catalysts, Co-salophen-Br exhibited the highest Faradaic efficiency for CO. Notably, the Faradaic efficiency for CO over Co-salophen-Br reached 98.5 % at −0.70 V versus reversible hydrogen electrode, which was 1.5 and 1.2 times as high as those over Co-salophen-Cl (64.8 %) and Co-salophen-I (81.8 %), respectively. Density functional theory calculations revealed that high-spin state of Co sites decreased the reaction energy barrier for the formation of CO. Based on the analysis of electronic state, the ratio of high-spin state was 65.6 % for Co-salophen-Br, which was the highest among the three Co-based molecules. The Co sites with high-spin state promoted the electron transfer from high-energy 3 d orbital (3 d z2 and 3 d x2-y2 ) of Co to the unoccupied π * orbital of CO 2 , improving catalytic performance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 45
·21350-21358
·
IF 3.591
Zhen-Zhen Ma,Yao Ma,Bing Liu,Ling Xu,Huan Jiao
Two cobalt metal–organic frameworks (Co-MOFs), [Ch]2[Co3(BDC)3Cl2] (1) and [Ch]2[Co3(BDC)4]·2DMU (2) (Ch+ = choline cation; H2BDC = terephthalic acid; DMU = 1,3-dimethylurea), were prepared through ionothermal reactions with deep eutectic solvents (DESs) of ChCl and DMU as the reaction media. The 1/GCE electrode with better current response was selected as the electrocatalyst. The detection performance of the 1/GCE electrode towards glucose is excellent with a wide linear range of 10–1200 μmol L−1, a detection limit of 3.2 μmol L−1 (S/N = 3), and a rapid response less than 3 s in 0.01 mol L−1 NaOH. 1 also exhibits high anti-interference with the existence of D-Man, D-Fru, DL-AA, and BA, long-term stability of 15 days and reproducibility for glucose detection. 1 was utilized to detect glucose in human serum and orange juice. The found glucose concentrations are very close to the added glucose concentrations in the selected situations with low RSD and high recoveries. This demonstrates that as a non-enzymatic glucose sensor, 1/GCE can detect glucose with high accuracy and reliability in different environments.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Xiao Xia,Liqiang Zhang,Zhanyao Li,Xueliang Yuan,Chunyuan Ma,Zhanlong Song,Guifang Chen
CaSO 4 reduction decomposition for CaO preparation provides a theoretical basis for the utilization of the industrial byproduct, gypsum. In this study, the effects of temperature (950 °C–1150 °C), CO 2 /CO partial-pressure ratio (1–15), CO concentration (1%–5%), and O 2 concentration (1%–7%) on the preparation of CaO from CaSO 4 by CO reduction decomposition under different reaction atmospheres were investigated. The physical properties of CaO prepared by the decomposition of CaSO 4 and CaCO 3 were analyzed and compared. Finally, the reaction mechanism of the reduction decomposition of CaSO 4 to CaO by CO was studied. The findings reveal that CaSO 4 can be completely decomposed into CaO when the reaction temperature exceeds 1000 °C, CO% ≥ 2%, and P(CO 2 )/P(CO) ≥ 8. Furthermore, the addition of an appropriate amount of O 2 can improve the yield of CaO in the products. In an O 2 –CO–N 2 atmosphere, where O 2 % = 7% and CO% = 16%, CaSO 4 can be completely decomposed into CaO without the addition of CO 2 . The physical properties of CaO prepared by the reduction and decomposition of CaSO 4 are better than those prepared by the calcination of CaCO 3 . An analysis of the reaction mechanism of the reduction decomposition of CaSO 4 by CO reveals that CaSO 4 generates CaO and CaS simultaneously. In addition, CaS can react with unreacted CaSO 4 to form CaO. Furthermore, it can react with CO 2 to produce CaO if an appropriate amount of CO 2 is added to the reaction atmosphere. The secondary interactions of CaS with CaSO 4 and CO 2 can significantly improve the yield of CaO in the product.
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Molecular Catalysis
·
2021
·
IF 5.062
Jing Cao,An Li,Yicen Zhang,Linchao Mu,Xi Huang,Yankun Li,Tao Yang,Cen Zhang,Congshan Zhou
To prepare catalyst with high activity, high selectivity and good stability remains the biggest challenge in the hydrodeoxygenation (HDO) of phenols by adopting MoS 2 -based sulfides as catalysts. Herein, we report a simple hydrothermal method to synthesize highly-dispersed nano-MoS 2 with abundant defects and some curved slabs. All these advantages enable nano-MoS 2 to provide a large number of coordination unsaturated sites to anchor Co atoms. The unsupported Co-doped catalyst with an optimal Co/(Co + Mo) molar ratio of 0.3 exhibited excellent performance in the HDO of p -cresol with conversion of 98.7 % and toluene selectivity of 98.9 % at 220 °C. Moreover, the optimized Co/MoS 2 -0.3 catalyst had a good stability after reaction of 72 h. The excellent HDO performance was attributed to the formation of abundant Co-Mo-S active sites which optimize the electrical structure of nano-MoS 2 by Co promoter.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingcen Liu,Jin Yuan,Zhuo Zhang,Zhaohui Huang,Jingcheng Hao
The construction of peptide and metal nanoparticles hybrid is attractive to explore their synergistic properties and applications extensively. However, it remains a challenge to fabricate a well-defined and size-controllable short peptide/Au nanoparticles hybrid. Here, we report a facile and flexible co-assembly strategy for the construction of tripeptide coated Au nanorods (AuNRs). The tripeptide (Phe-Phe-Cys, FFC) grows via covalently crosslinking to form spheres. The size of the core@shell nanospheres can be controlled by modulating the amount or size of AuNRs. Especially, the concentration of AuNRs fixes the amount of seeds, which further affect the local concentration of FFC on the surface of AuNRs seed, leading to a narrower diameter of hybrid compared to FFC spheres. Moreover, owing to their synergistic effects, this hybrid exhibits a good adsorption capacity of Hg 2+ from aqueous solutions by electrostatic interaction and forming into Au/Hg amalgam . This strategy could be extended to the fabrication of other biomolecules and metal nanoparticle hybrids with diverse functions.
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高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 10
·3422-3427
·
IF 6.119
Yuqing Shao,Xinkui Wang,Zhaolin Dou,Xiaoyu Liang,Xinxin Zhang,Min Pang,Qiang Xu,Min Ji,Min Wang
Solar-driven CO2 conversion into fuels and sustainable energy has attracted increasing attention around the world. However, the efficiency of the transformation remains relatively low due to the rapid recombination of photogenerated charge carriers. In this work, we prepared a ZnIn2S4–ZnAlOx nanocomposite for visible light driven CO2 reduction. The thin layered structure facilitated the photoinduced charge carrier separation and transfer, and also gave excellent adsorption ability towards CO2 molecules. Such a nanocatalyst exhibited excellent activity in visible-light driven CO2 reduction with a CO optimal formation rate of 1100 μmol g−1 h−1, which is 5 times that over bulk ZnIn2S4, and the CO/H2 ratio was increased from 0.2 over bulk ZnIn2S4 to 1.5 over the ZnIn2S4–ZnAlOx composite. In situ FT-IR experiments indicated that CO2 was reduced on ZnIn2S4–ZnAlOx following a COOH* pathway. This work gives insights into the mechanism of the photocatalytic CO2 reduction reaction and inspiration to construct novel heterostructure materials for application in energy and environmental catalysis.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 23
·13023-13030
·
IF 4.22
Bian Kan,Li Xiuxiu,Wang Yiping,Li Xiongjie,Sun Sheng,Feng Shuo,Yang Ying
Pb(Zr, Ti)O 3 (PZT)-based piezoelectric ceramics and Al 2 O 3 -based structural ceramics were cast and co-fired to prepare a layered piezoelectric ceramic/structural ceramic composite. Considering the significant differences in sintering characteristics of PZT- and Al 2 O 3- based ceramics, control of the sintering temperature and the dependence of the linear shrinkage on the solid content of the tape-casting films were systematically conducted at first. The sintering density and the interface bonding properties of the prepared composites were then investigated. The results of electrical and mechanical properties of the composite ceramics indicate: By using sintering aids, Al 2 O 3 ceramic could be fully densified and co-fired with PZT ceramic at 1150 °C. Shrinkage matching during sintering was achieved by adjusting the solid contents to 45 vol.% and 65 vol.% for PZT and alumina tape-casting films. In the layered composites, Al 2 O 3 structural ceramic presents an excellent mechanical property with HV hardness of 667, while the PZT functional ceramic presents d 33 , ε r and tanδ of 259 pC/N, 965 and 0.37%, respectively.
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