INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Xiaoqi Liu,Yanyun Zhang,Yan Liu,Ting'an Zhang
Chitosan bead grafted by third-generation dendrimers (CB-G3) with a diameter of 1.40 mm was synthesized to investigate their performance in recovering Ag(I), Cu(II), and Pb(II) ions in aqueous media. The prepared adsorbents were characterized by XRD, FT-IR, elemental analysis, TGA , and SEM, and the effects of pH, contact time, concentration, and temperature were examined. The results showed that the adsorbents were successfully fabricated. The optimum pH value was 5, and the increased generation number contributed to adsorption capacity improvement, indicating that electrostatic interactions between amine groups and metal ions are the governing mechanism of adsorption by the CB-G3. The kinetics, isotherms, and thermodynamics of Ag(I), Cu(II), and Pb(II) adsorption onto the CB-G3 were investigated. The adsorption processes can be described using pseudo-second-order kinetic and Langmuir models. The maximum monolayer adsorption capacities were 105.62, 88.82, and 97.87 mg·g −1 for Ag(I), Cu(II), and Pb(II) at 30 °C within 210 min, respectively. Electrostatic interactions and hydrogen bonds are the main mechanisms between metal ions and N atoms. Therefore, the CB-G3 is a promising candidate for Ag(I), Cu(II), and Pb(II) adsorption owing to its splendid ability in easy separation, good adsorptivity, and reusability for efficiently adsorbing Ag(I), Cu(II), and Pb(II) ions.
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CHEMICAL PHYSICS LETTERS
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2023
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IF 2.8
Lei Xia,Yi Lu,Yuan-Zhou Li,Zhi-Yi Hu,Xiao-Yu Yang
Photocatalytic hydrogen production from seawater has great prospects for generating clean energy from renewable resources. We designed a TiO 2 -rGO-Cu photocatalyst that possesses a pathway for directed electron transfer from nitrogen-doped TiO 2 to rGO and then to Cu nanoparticles, which leads to efficient electron-hole pairs separation. Results show that TiO 2 -rGO-Cu has a hydrogen production rate of 16.08 mmol h −1 g −1 in simulated seawater, which is as much as 25 times higher than that of TiO 2 . The mechanism for a highly efficient directional interfacial electron transport is proposed. The strategy could be effective for designing new photocatalysts for hydrogen production from seawater.
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Catalysts
·
2023
·Vol. 13
·期 4
·673
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IF 3.9
Jinghu Zhu,Hui Liu,Xueyan Zhou,Zhijun Wang,Liancheng Bing,Dezhi Han,Guangjian Wang,Fang Wang
Cu-based catalysts, modified by gallium addition via the stepwise co-precipitation method, were studied for the liquid phase hydrogenation of hydroxypivalaldehyde (HPA) to neopentyl glycol (NPG). Through physico-chemical techniques, the effects of gallium introduction on the Cu trimetallic catalyst performance and the reaction mechanism of HPA hydrogenation were discussed. The characterization results showed that gallium introduction can influence the dispersion, reduction, and distribution of active Cu species, as well as their reactivity. Herein, the catalyst with 2 wt% gallium addition exhibited excellent catalytic performance with HPA conversion rate and NPG selectivity of 93.5% and 95.5%, at a reaction pressure of 3 MPa, temperature of 110 °C, hydrogen-aldehyde ratio (molar ratio) 10:1, and liquid space-time at a speed of 8.4 h−1. The good performance could be attributed to gallium doping tending to dynamically tune the interaction between the components, increasing Cu dispersion and the distributions of Cu+and Cu0species on the catalyst surfaces.Keywords:HPA hydrogenation;NPG synthesis;Cu-based catalyst;gallium modification;Cu+/Cu0
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JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Lijin Wang,Zhongyuan Guan,Zhenyang Liu,Ouyang Lin,Wenrong Cui,Zhe Yin,Aiwei Tang
The interplay between ZnS shelling reaction and cation exchange affected the genuine nanostructure of the multinary Cu–In–S-based nanocrystals (NCs), which arose from the dosage and injection speed of Zn precursors as well as the surface of the seed NCs. The effects of Zn precursors on the growth of Cu–In–Zn–S NCs have been previously reported. However, effective control of cation exchange based on the surface of seed NCs is still lacking. Herein, a seed-mediated growth method was developed to eliminate the instability of free ligands and ions on the seed NCs. The clean surface of seed NCs was critical for balancing the internal cation exchange and epitaxial shelling reaction of NCs. Importantly, the photoluminescence quantum yield of the Cu–In–Zn–S NCs has been improved without peak shift through this method. In this dynamic balanced process, the as-obtained Cu–In–Zn–S NCs were confirmed to be gradient alloyed structures rather than core-shell structures. Furthermore, this method can be used to synthesize green- and red-emission Cu-In-Zn-S NCs as well. This seed-mediated strategy through simple redispersion may pave a way toward the controllable synthesis of NCs with gradient alloyed structures.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Yaoyao Zhang,Kangze Yuan,Luca Magagnin,Xishe Wu,Zhenyi Jiang,Wei Wang
Mercapto-functionalized aerogels (MA-X) were fabricated using γ-mercaptopropyltrimethoxysilane (MPTMS) as a modification reagent to eliminate Pb (II) and Cu (II) ions from wastewater. Mercapto-functionalized aerogel (MA2) with the MPTMS/TEOS molar ratio of 0.5 exhibited the maximum adsorption amounts of 163.99 mg/g for Pb (II) and 172.41 mg/g for Cu (II) in single ion system, respectively. In binary ion system, selective adsorption experiments revealed that the equilibrium adsorption capacity for Cu (II) (161.29 mg/g) was significantly greater than Pb (II) (90.42 mg/g), and the selectivity factor α showed greater selectivity for Cu (II), demonstrating that Cu (II) was more readily adsorbed on MA2. The results showed that adsorption was consistent with pseudo-second order model and Langmuir model. Thermodynamic results demonstrated that adsorption phenomenon was an exothermic reaction that occurred spontaneously. XPS analysis and density functional theory (DFT) simulations showed that the main mechanism for the adsorption of Pb (II) and Cu (II) on MA2 was through coordination chelation of the –SH groups with Pb (II) and Cu (II). DFT calculations showed a lower adsorption energy (E ads ) of Cu (II) (−2.72 eV) with respect to Pb (II) (−0.80 eV), indicating that Cu (II) was more stably adsorbed on MA2 and more difficult to exchange by Pb (II). In order to determine the environmental impact of the MA2 preparation process, a life cycle assessment (LCA) was conducted and contribution of each material to MA2 production was analyzed. Finally, a strategy that is environmentally friendly and effective has been proposed in order to facilitate MA-X adsorbents production and to improve their application for the treatment of heavy metal polluted wastewater.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
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IF 9.1
Bowen Cui,Chengguo Wang,Yanxiang Wang,Chengjuan Wang,Haotian Jiang,Mengfan Li,Zhenhao Xu
Cu nanoparticles were loaded on the surface of continuous carbon fibre (CF) and catalysed the growth of carbon nanotubes (CNTs) by continuous catalytic chemical vapour deposition . The results of Cu and traditional catalysts were contrastively studied in terms of surface morphology , microstructure and mechanical properties . It is reflected that the CNTs grown from Cu catalysts are in suitable distribution, with unique bamboo‐like structure and higher graphitisation degree. The carbon nanotube–carbon fibre utilising Cu catalyst has 53.0% higher interfacial shear strength than the pristine fibre, and shows advantage in tensile strength over its counterparts of traditional catalysts. Above all, a “loading–catalysis–reinforcing” mechanism was established, which theoretically and systematically explains how the nature of different catalyst metals affects the various stages in the process of growing CNT on the surface of continuous CF. This research expands the catalyst options, and develops the catalysis mechanism that offers an important theoretical guidance for the process optimization.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
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IF 5.8
Yong-Qiang Xu,Liu-Yuan Zang,Hai-Yu Gao,Jin Peng,Dong-Yun Zheng,Chao Liu,Xiao-Jun Liu,Dong-Bing Cheng,Chun-Nan Zhu
Gd 3+ -doped quantum dots (QDs) have been widely used as small-sized bifunctional contrast agents for fluorescence/magnetic resonance (FL/MR) dual-modality imaging. However, Gd 3+ doping will always compromise the FL of host QDs. Therefore, balancing the Gd 3+ doping and the optical properties of QDs is crucial for constructing high-performance bifunctional nanoprobes . Additionally, most paramagnetic QDs are synthesized in the organic phase and need to be transferred to the aqueous phase for bioimaging. Herein, ingeniously designed shell-doped Cu-In-S/ZnS:Gd 3+ QDs have been prepared in the aqueous phase. It has been demonstrated that isolating paramagnetic Gd 3+ from fluorescent Cu-In-S core via doping Gd 3+ into ZnS shell not only avoided the decrease of FL quantum yield (QY), but also ensured the water accessibility of paramagnetic Gd 3+ ions, by which the FL QY and r 1 relaxivity of Cu-In-S/ZnS:Gd 3+ QDs achieved as much as 15.6% and 15.33 mM -1 ·s -1 , respectively. These high-performance QDs with excellent stability, low biotoxicity, and good tumor permeability were successfully applied for in vivo tumor FL/MR dual-modality imaging, and have shown significant potential in the precision detection and diagnosis of diseases.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
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IF 10.753
Guangyu Duan,Xintong Li,Xin Ma,Wei Zhong,Shuai Wang
Cu/Ni-bearing wastewater contamination has recently been a challenge for the environmental protection worldwide. Herein, a novel poly(2-acrylamide-pentanedihydroxamic acid) (PAPDA) resin containing –CONHOH and –COOH groups was prepared and applied to effectively remove Cu 2+ and Ni 2+ from heavy metal wastewater. The batch adsorption experiments revealed that the maximum adsorption capacities of PAPDA resin for Cu 2+ and Ni 2+ were 436.08 and 195.05 mg·g −1 , respectively, which were 10.20 and 9.45 times higher than that of polyacrylic resin . Specifically, the adsorption kinetics and thermodynamics of PAPDA were respectively consistent with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating that the adsorption is a single-layer chemisorption process. Besides, the adsorption mechanism was investigated by SEM, XRD, FT-IR, XPS, DFT calculations, suggesting that the PAPDA resin possessing abundant active sites could effectively adsorb the heavy metal ions . Noticeably, the –CONHOH groups represented the strong affinity towards Cu 2+ and Ni 2+ by forming stable five-membered rings. In addition, column experiments were conducted to study the practical adsorption process of PAPDA resin to heavy metal ions. Overall, the results proved that the novel PAPDA resin as a green and highly efficient adsorbent has a promising potential for the treatment of heavy metals-containing wastewater.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2023
·Vol. 26
·期 11
·e202200640
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IF 2.3
Chen Wang,Nan Gao,Zhaoqing Gao,Ruofan Li,Yunpeng Wang,Weitao Gong
Graphical CuO/Cu glucose catalytic electrode is fabricated by copper anodization which can construct nanostructure in situ on copper substrates and regulate the chemical composition and morphology of the anodized films. The anodized CuO/Cu sample can be used as catalytic electrode directly and presents a high catalytic performance towards glucose oxidation. Potentiostatic anodization was developed to synthesize copper oxide/copper (Cu x O/Cu, x=1,2) electrode with nano structure for sensitive non-enzymatic glucose detection. At a catalytic potential of 0.55 V, the CuO/Cu electrode presented a high sensitivity of 2954.38 μA mM −1 cm −2 to glucose and a linear range of 0.1 mM to 1.3 mM. The response time is less than 3 s with addition of 0.1 mM glucose. The CuO/Cu electrode above was anodized in 1M KOH solution at −100 mV and the morphology was compact nanoparticles and sparsely dispersed nanosheets, which enlarged the surface area and provided abundant electrocatalytic active sites. Compared the sensing property of electrodes with different morphologies, it indicated that nanostructure was significant to the efficient glucose catalytic oxidation process and it could be regulated by changing the potential and electrolyte concentration during anodization.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 11
·2211845
·
IF 19
Chuan Fan,Yong Luo,Meng Tian,Mengyun Zhou,Lirong Wang,Tailin Xu,Xueji Zhang
“Green Synthesis” has been broadly applied in drug synthesis and nanomaterial preparation. The integration of automated micro-synthesis and high-throughput screening systems is a key way to achieve the goal of green manufacturing. Here, a one-click green synthesis platform is designed that integrates droplets arrays-based micro-synthesis for Raman enhancement performance high-throughput screening of MNPs@Cu-MOF (AuNPs@, AgNPs@, PtNPs@Cu-MOF) under room temperature and normal pressure. The fully integrated ultrasound units can achieve rapid multi-component mixing in the droplet array systems, and significantly accelerate materials growth as well as enhance encapsulation of noble metal nanoparticles into Cu-MOF structures. Based on such integrated systems, structures with high Raman enhancement performance can be high-throughput evaluation and easily screened out. The results indicated that the AgNPs@Cu-MOF exhibited the best Raman enhancement performance, which is ≈8 times higher than pure AgNPs. Such a green and integrated platform provides a way for automated multi-type composites fabrication, which can be expanded to multiple fields in the future via combined robotic platforms and artificial intelligence technology.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Luwei Wang,Chenliu Tang,Pengfei Huang,Xiang Hu,Zhirong Sun
The widespread detection and potential adverse effects of antibiotics in the aquatic environment call for effective treatment technology. Electro-Fenton is a promising strategy, but the preparation of efficient and stable cathodes is still challenging. In this study, a novel metal-organic framework (MOF)-derived N-doped cathode Fe/Cu-C400Ar was synthesized successfully for the degradation of ceftazidime (CAZ) in heterogeneous electro-Fenton (hetero-EF) system. The doping of copper could enhance electrocatalysis with a high electrochemical surface active area and low resistance. Fe/Cu-C400Ar cathode achieved CAZ removal efficiency of 99.5 ± 0.4% within 120 min, and it exhibited excellent stability after six recycle runs. Quenching experiments and electron paramagnetic resonance (EPR) tests proved that the primary species was hydroxyl radical during the CAZ degradation. In addition, the degradation pathway of CAZ was proposed including the cleavage of the pyridine ring and the shedding of the thiazole ring. Moreover, the prediction of intermediates toxicity by Ecological Structure Activity Relationships (ECOSAR) software indicated the environmentally friendly features of the CAZ degradation process. This study provided a promising cathode for the electrocatalytic degradation of antibiotic wastewater in hetero-EF system.
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Frontiers in Energy Research
·
2023
·
IF 3.4
Huang Jiamin,Zhang Guanghui,Wang Mingrui,Zhu Jie,Ding Fanshu,Song Chunshan,Guo Xinwen
The catalytic production of higher alcohols (HAs) is a promising path for converting CO2 into value-added chemical products. The application is still limited by the low selectivity of HAs (less than 10%) on most catalysts. Here, we report a tandem catalyst consisting of Mn-Cu-K modified iron carbide and CuZnAlZr catalyst. The modification of iron carbide with Mn, Cu and K promoters improves the formation of HAs (13.5% Sel.), and the construction of tandem catalysts with CuZnAlZr can further enhance the catalytic performance. By examining different catalyst filling methods and the filling ratio of the tandem catalyst, it was found that the powder mixing resulted in a higher selectivity of HAs with a mass ratio of the two components of 1:1, and a synergistic effect leads to a higher selectivity of HAs (15.5%) with about 40% of propanol and butanol among HAs.
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