SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Liuyang He,Lixin Lv,Suresh C. Pillai,Hailong Wang,Jianming Xue,Yongfei Ma,Yanli Liu,Yulin Chen,Li Wu,Zulin Zhang,Lie Yang
Iron/copper bimetallic nanoparticles based sludge biochar (Fe/Cu-SBC) was prepared by using a modified co-precipitation route. The Fe/Cu-SBC system prepared was subsequently applied to activate periodate (IO 4 − ) to degrade diclofenac sodium (DCF) by using UV light at room temperature (25 °C). The physicochemical properties of both SBC and Fe/Cu-SBC such as morphology, physical properties, crystal structures and functional groups were examined. The type and number of surface functional groups were found to be increased and the catalytic performance was improved by the modification of Fe/Cu bimetallic nanoparticles. The influence of various parameters to evaluate the catalytic efficiency such as periodate (PI) concentration, dosage of catalysts, UV power, initial pH and coexisting anions were investigated. Under the optimized conditions (pH 6.9, UV-power 60 W, PI concentration of 5 mM and 0.1 g Fe/Cu-SBC), it was observed that 99.7% of DCF was degraded with a pseudo-first-order kinetics reaction constant 9.39 × 10 −2 min −1 . The radical scavenging experiments showed that IO 3 radicals were the predominantly reactive oxidants in the Fe/Cu-SBC/UV system. Therefore, this investigation provides a feasible alternative for the degradation of PPCPs in wastewater.
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ACS Omega
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2021
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IF 3.512
Huayong Luo,Yu Liu,Hanxing Lu,Qian Fang,Hongwei Rong
This work dealt with a potential and effective method to reuse modified alginate beads after the removal of Cu(II) ions for efficient adsorption of tetracycline (TC) from aqueous solutions. The modified alginate beads were fabricated by a polyacrylamide (PAM) network interpenetrated in alginate–Ca2+ network (PAM/CA) decorated with polyethylene glycol as a pore-forming agent. The porous PAM/CA was characterized using scanning electron microscopy, Brunauer–Emmett–Teller, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analysis. The adsorption kinetics, isotherms, adsorption stability, and reusability studies of the adsorbent toward Cu(II) ions were scrutinized. The column performance of porous PAM/CA was tested with Cu(II)-containing electroplating wastewater. After Cu(II) adsorption, the Cu(II)-adsorbed PAM/CA (PAM/CA@Cu) was applied to remove TC from aqueous solutions without any regeneration process. The effects of pH, initial TC concentration, ionic strength, and coexisting ions on the adsorption were also discussed in detail. Compared with many reported adsorbents, the PAM/CA@Cu exhibited an excellent adsorption performance toward TC with a maximum adsorption capacity of 356.57 mg/g predicted by the Langmuir model at pH 5.0 and 30 °C with the absence of coexisting ions. The possible adsorption mechanism of TC onto the PAM/CA@Cu was revealed.
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Greenhouse Gases-Science and Technology
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2021
·Vol. 11
·期 6
·1234-1244
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IF 2.013
Ting Lei,Dong Wei,Dongya Feng,Hao Chen,Hairong Yue
The Cu-based catalysts have been widely employed in the hydrogenation of CO 2 -derived ethylene carbonate (EC) to ethylene glycol (EG) and other derivatives, but still suffered from some problems such as unsatisfactory selectivity and catalyst stability. Herein, a Cu@MIL-101 catalyst was prepared via a two-solvent method to anchor copper (Cu) nanoparticles into the MIL-101 metal organic frameworks, which exhibited superior catalytic performance with ∼100% conversion, 2-hydroxyethyl formate (2-HEF) selectivity of 82% at 160°C, or EG selectivity of ∼92% at 180°C. The characterization results showed that the Cu 0 and Cr 3+ species play a key role on the dissociation of H 2 and activation of C-O and C=O bonds in the esters, and thus exhibited an excellent catalytic performance of the EC hydrogenation. In addition, the strong interaction between Cu 0 species and unsaturated coordination Cr 3+ species in the MIL-101 framework resulted in the high stability. Since the product of methanol was not generated on the Cu@MIL-101 catalyst, it is valuable to produce 2-HEF by controlling the temperature of 160°C in the EC hydrogenation rection. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.
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CHEMISTRY OF MATERIALS
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2021
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IF 9.811
Jinglong Huang,Binbin Su,Enhai Song,Maxim S. Molokeev,Zhiguo Xia
Low-dimensional hybrid metal halides demonstrate broad-band emission and high photoluminescence quantum yield (PLQY) acting as excellent candidates for a new generation of luminescent materials in lighting fields. However, most luminescent metal halides can only be excited by ultraviolet radiation, and the discovery of high-efficient emitters with broad-band excitation characteristics, especially upon efficient blue light irradiation, is a challenge. Herein, a zero-dimensional (0D) Cu(I)-based organometallic halide (18-crown-6)2Na2(H2O)3Cu4I6 (CNCI) was prepared with a green emission band centered at 536 nm and a near-unity PLQY (91.8%) upon excitation of 450 nm. Importantly, the ultrabroad excitation band covering a 300–500 nm range was observed in CNCI, and the luminescence mechanism has been discussed in detail. A white light-emitting diode (WLED) was fabricated with high luminous efficiency of 156 lm/W and a high color rendering index of 89.6. This work provides guidance for designing high-performance luminescent metal halides with suitable excitation characteristics and also promotes the application prospects of such materials in WLED fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Jinxin Wei,Zhe Hu,Wenjie Zhou,Yi Qiu,Hanqing Dai,Yuanyuan Chen,Zhongjie Cui,Siyu Liu,Haiyang He,Wanlu Zhang,Fengxian Xie,Ruiqian Guo
With the blooming development of zero-dimensional nanomaterials , I-III-VI alloying quantum dots (QDs) with outstanding photoelectrical properties have emerged to attract much attention as promising environmentally-friendly substitutions for conventional binary Cd-based QDs. In this work, a facile one-pot method was introduced to synthesize unreported quaternary Ag-Cu-Ga-Se/ZnSe (ACGSe/ZnSe) QDs. A relatively high photoluminescence quantum yield (PL QY) of 71.9% and a tunable emission from 510 to 620 nm were successfully achieved. We explored the roles of alloying compositions in ACGSe/ZnSe QDs, inferring that increased Ag proportion would not only lower the V defect level which leads to the blue shift of emission, but also slow the ZnSe shelling process owing to the larger lattice distortion. At last, the white light-emitting diodes (WLEDs) were fabricated with ACGSe/ZnSe QDs as the conversion layer, indicating that the as-prepared QDs are a promising candidate for further applications.
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JOURNAL OF THE ENERGY INSTITUTE
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2021
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IF 6.186
Yunwu Zheng,Jida Wang,Donghua Li,Can Liu,Yi Lu,Xu Lin,Zhifeng Zheng
To improve the quality of bio-oil and minimize coke formation, ex-situ catalytic biomass pyrolysis vapor upgrading to high-grade bio-aromatic and phenol compounds with Py-GC × GC/MS at different nickel-to-copper ratios was investigated. At the same time, the deoxygenation efficiency, structure-activity relationship, deactivation mechanism and possible pathways between combined mono- and bimetallic catalysts were also demonstrated. Ni and Cu species could be well dispersed, and the HZSM-5 support maintained the MFI crystal structure after bimetallic Ni–Cu modification, but the surface area, pore volume, and total acidity decreased. Bimetallic Ni–Cu catalysts showed better deoxygenation efficiency than monometallic catalysts, which had more advantages in the preparation of aliphatic hydrocarbons (29.86%) than mono- and bimetallic catalysts, which favored the production of aromatics (28.89%). Higher-Ni-loading catalysts promoted the formation of aliphatic hydrocarbons, aromatics and alkanes due to decarboxylation, decarbonylation and aromatization reactions, and higher-Cu-loading catalysts enhanced the olefin and phenol yields due to dehydration and demethylation reactions. Overall, the highest yields of bio-aromatic compounds and phenols were46.78% and 36.34%, respectively, at Ni-to-Cu ratios of 1:1 and 1:2, due to the high total acid amount and suitable average pore size for bio-aromatics and the low acidity and large pore size for phenols. The bimetallic Ni–Cu catalyst significantly increased the quality of bio-oil and reduced coke deposition.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Ziyi Xiao,Junsheng Zhou,Lu Fan,Yu Li,Yuting He,Yingxi Wang,Ling Li
A composite paper was designed in order to remove dyes and heavy metal ions in wastewater, which was prepared by assembling NH2-Cu-BDC layer by layer on the surface of the carboxymethyl-modified filter paper (CMFP). The prepared composite paper (Cu-MOFs/CMFP) shows the ability to capture dyes and metal ions, and the dye and metal solution can be separated by simple filtration on the MOF paper at the same time. The application of 30-layer Cu-MOFs/CMFP in the removal of pollutants in simulated wastewater was discussed, and it was found that Cu-MOFs/CMFP can simultaneously remove dyes and heavy metal ions with removal rates close to 90%. In addition, Cu-MOFs/CMFP can be reused after a simple washing process and maintains prosperous dye capture ability. The successful development of this technique provides a new strategy to design new materials for the removal of organic dyes and heavy metal ions in wastewater.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Xiangzhao Zhang,Puhao Xu,Xinyue Wu,Xinyi Gui,Guiwu Liu,Mingfen Zhang,Haining Meng,Guanjun Qiao
The wetting of ZrB 2 ceramic by molten pure Cu, Cu-(20, 30, 40, 50 at.%)Ti alloys were performed by the sessile drop method under vacuum of ∼4 × 10 −4 Pa in the 1030−1070 °C temperature range. The wetting and interfacial behaviors of Cu-Ti/ZrB 2 systems were analyzed and discussed. Furthermore, the work of adhesion and electronic properties of the Cu(1 1 1)/ZrB 2 (0 0 0 1) and Ti(0 0 0 1)/ZrB 2 (0 0 0 1) atomic interfaces were quantitatively evaluated by first-principles method. The wettability is significantly improved with the Ti concentration or wetting temperature increasing as a result of the formation of (Ti) solid solution at interface. The calculated results show that the B-terminated ZrB 2 (0 0 0 1) surface is preferable to bond with Ti(0 0 0 1) surface, and the electronic structure reveals that the dominant interfacial bonding is the Ti-B ionic bond for the Ti/B-terminated ZrB 2 interface.
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Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 14
·5361-5370
·
IF 6.482
Honghong Gong,Yipin Cheng,Ying Zhang,Jie Xiong,Zhicheng Zhang
The detection of copper ions is rather important since they have undesired hazardous effects on the ecosystem and human health. Many methods have been developed for copper ion detection in the aqueous phase among which the direct detection of copper ions in the organic phase has been rarely reported. To overcome the disadvantage of the complicated sample pre-treatment involving the detection of copper ions in the organic phase, herein, we report a type of poly(vinylidene fluoride) based fluoropolymer (P(VDF–ATrFE)) as a novel fluorescence sensor for copper ion detection. A poly(vinylidene fluoride) based fluoropolymer (P(VDF–ATrFE)) can selectively bind to Cu2+ in the presence of an organic ligand, which is utilized to directly demonstrate the sensitive detection of Cu2+ in the organic phase. A rapid time response, excellent selectivity and highly efficient quantitative analysis of Cu2+ in the organic phase are obtained using P(VDF–ATrFE) as a fluorescent probe. This work provides a fast and convenient visual fluorescence detection method of Cu2+ in the organic phase.
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APPLIED CATALYSIS A-GENERAL
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2020
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IF 5.006
Wanliang Yang,Meng Chen,Jiayuan Zhou,Yingnan Duan,Yinmin An,Mao Liu,Mengkui Tian
Porous carriers play an important role in the catalytic transformation of syngas into higher alcohols, which promises higher sustainability in C1 chemistry. In this work, a series of hierarchical hollow silica spheres (HHSS) supported Cu-Fe bimetal catalysts were successfully prepared through ultrasonic-assisted impregnation for higher alcohols synthesis from syngas. Structural characterization results indicate that the hierarchical hollow structure of HHSS support can be maintained and the Cu-Fe bimetallic nanoparticles are highly dispersed on HHSS surface. The catalytic performances of samples in the test of CO hydrogenation for higher alcohols synthesis were investigated. The results revealed that the conversion rate of CO and the selectivity of C 2+ OH alcohol increased first and then decreased with the decrease of the amount of Cu content in the Cu x Fe y @HHSS catalyst. The highest CO conversion, alcohol selectivity and STY ROH over Cu-Fe@HHSS catalyst are 65.1 %, 46.6 %, and 118.1 gkg −1 h −1 , respectively. It was found that a large number of CuFe 2 O 4 were formed in Cu-Fe@HHSS catalyst and also confirmed that the CuFe 2 O 4 spinel and CuO-CuFe 2 O 4 were converted to Cu-Fe 5 C 2 composite in the spent Cu-Fe@HHSS catalyst, which can enhance the synergy between Cu-Fe bimetals. Furthermore, copper and iron are highly dispersed on HHSS after the reaction, which enhances the structural stability of the catalyst. Based on the development and utilization of low-cost catalysts and the production of clean liquid fuels, HHSS has a great prospect of catalyst support in the energy field.
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ANALYTICAL BIOCHEMISTRY
·
2020
·
IF 2.877
Lijun Wang,Tianyu Liao,Hong Zhou,Yukun Huang,Pengfei Chen,Xiao Yang,Xianggui Chen
Development of a rapid and sensitive method for Salmonella spp. detection is of great importance for ensuring food product safety due to its low infective dose. In this study, a colorimetric method based on the peroxidase-like activity of Cu(II)-modified reduced graphene oxide nanoparticles (Cu 2+ -rGO NPs) and PCR was successfully developed to detect Salmonella spp. in milk. Under optimal conditions, the developed colorimetric method exhibited high sensitivity and strong specificity for Salmonella spp . detection. The limit of detection was 0.51 CFU/mL with a linear range from 1.93 × 10 1 to 1.93 × 10 5 CFU/mL. A specificity study demonstrated that this method can specifically distinguish Salmonella typhimurium and Salmonella enteritidis from other foodborne pathogens. The application of the proposed method for milk sample detection was also validated, and the recovery rates of S . typhimurium in spiked milk sample ranged from 102.84% to 112.25%. This colorimetric sensor exhibits enormous potential for highly sensitive detection of bacteria in milk sample.
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ACS Catalysis
·
2020
·
IF 12.35
Zihao Zhang,Meizan Jing,Hao Chen,Francis Okejiri,Jixing Liu,Yan Leng,Haolan Liu,Weiyu Song,Zhaoyin Hou,Xiuyang Lu,Jie Fu,Jian Liu
The catalytic transformation of renewable fatty acids into value-added fatty alcohols without the use of gaseous hydrogen is a versatile technique for the utilization of microalgae and waste cooking oil, where Cu-based catalysts are considered to be the most suitable candidate. However, the interpretation of the structure–reactivity relationship caused by different crystal types of carriers and the metal–support interface is not well understood. Herein we synthesized ZrO2-supported Cu nanoparticle catalysts via different preparation methods and reduction temperatures under similarly exposed surface facets and Cu valency but different polymorphic phases of ZrO2 (monoclinic ZrO2: m-ZrO2; tetragonal ZrO2: t-ZrO2) and the metal–support interface. Interestingly, the as-synthesized Cu/t-ZrO2 catalysts showed remarkably better catalytic performance than Cu/m-ZrO2 for the in situ hydrogenation of lauric acid in the methanol–water system. Combined experimental and density functional theory (DFT) calculation results ascribed the lower efficiency of m-ZrO2 as a carrier to weakly adsorbed reactant and intermediate molecules as well as the absence of an oxygen vacancy in the crystal phase. The interface-rich Cu/t-ZrO2 catalysts displayed higher activity normalized to the surface-exposed Cu sites toward lauryl alcohol production than the interface-deficient counterparts. DFT calculation results further revealed that this metal–support interface plays an important role in promoting the C–O bond or H–H bond cleavage in two possible reaction routes, thus reducing the activation barrier of the overall reaction.
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