SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yijie Han,Cheng Chen,Yuxin Li,Lixiang Zhou,Yeqing Lan,Ying Li
Cu-Y binary oxysulfide was synthesized for the first time. A series of batch experiments were conducted to determine the optimum conditions for preparing the adsorbent and further investigate the effects of the initial pH and coexisting anions on the removal of arsenic. The results indicate that the adsorbent displays an extremely excellent performance in removing both As(III) and As(V). The maximal adsorption capacities at the initial pH 6.0 are 263.16 and 270.27 mg/g for As(III) and As(V), respectively. The adsorbent remains relatively stable even at the initial pH 3 and at this pH it also exhibits a very high removal efficiency for As(V). Based on Fourier-transform infrared (FTIR) spectrometer and X-ray photoelectron spectrometer (XPS) analyses and other results obtained in our experiments, a possible mechanism for the removal of arsenic is proposed. The dissolved O 2 is activated to O 2 − via a single-electron transfer reaction from Cu(I) on the adsorbent, which oxidizes As(III) to As(V). Then, arsenate anions are adsorbed onto the surface of the adsorbent and the adsorbed arsenate anions further react with the hydroxyl groups on the surface of the adsorbent via an ion exchange or precipitate with Y(III) on the surface of the adsorbent .
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高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Yurong Luo,Hao Li,Muzhi Cai,Yuan Liu,Liang Chen,Shiqing Xu,Gongxun Bai
Cu 2+ is an essential trace element for humans and animals, and the precise detection of Cu 2+ can help diagnose many diseases. However, the current Cu 2+ detection technology still needs to be improved in terms of the biocompatibility of the material, the penetration of the excitation source, and the detection limit. In this paper, the polyacrylic acid (PAA) capped NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 core–shell nanoparticles (NPs) with a particle size of about 22.5 nm is proposed. Under the excitation of 980 nm with strong penetration, the Cu 2+ concentration can be detected by the emission intensity of NPs at 520 nm, and the detection limit is 0.018 μM. In addition, this material can also perform temperature detection within 296–373 K with a relative sensitivity of 1.23 % K −1 . Therefore, this NPs is a promising multifunctional material that can detect temperature and Cu 2+ concentration.
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高影响因子
Advanced Optical Materials
·
2023
·Vol. 12
·期 9
·2302063
·
IF 9
Yakun Hu,Jiance Jin,Kai Han,Zhiguo Xia
Doping in luminescent metal halides has become an effective strategy for tailoring the optoelectronic properties. Herein, Cu + is introduced into Rb 2 AgBr 3 to design the synthesis of Rb 2 AgBr 3 : x Cu + , which possess cold-white light emission at room-temperature without changing the spectral profiles; however, the Cu + incorporation significantly enhances the photoluminescence quantum efficiency to 98.8% in Rb 2 AgBr 3 :0.05Cu + . Additionally, a high scintillation light yield of up to 79 250 photons MeV −1 and a low detection limit of 714.83 nGy s −1 have been achieved via this Cu + doping engineering. X-ray imaging with a spatial resolution of up to 5.8 lp mm −1 is further realized using a large scintillator film prepared by mixing polydimethylsiloxane with Cu + doped Rb 2 AgBr 3 scintillators. This study provides a Cu + doping design principle for improving both the photoluminescence and scintillation performances of metal halides.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yue Tian,Xiaoyan Liu,Xiaoqing Cao,Dieqing Zhang,Shuning Xiao,Xinru Li,Zaiyuan Le,Xianyang Li,Hexing Li
1T MoS 2 has recently attracted growing interests for energy storage due to the excellent conductivity, expanded layer space and extra exposed active sites. However, its application is still limited due to the complicated synthesis under harsh condition and poor structural stability. Herein, we report a novel MoS 2 /Cu nanowires (NWs) by microwave-assisted self-assembly of ultrathin 1T MoS 2 onto Cu NWs with interconnected conductive network and robust one-dimensional (1D) structure. As anode material for LIBs, 1T MoS 2 /Cu NWs exhibits high capacity and stability owning to the enhanced electron transport and lithium ions intercalation. Meanwhile, the enriched nanovoids supply extended space for buffering the volume change and boosting electrolyte penetration during cycling process. Moreover, Cu doped MoS 2 could also stabilize the 1T phase, leading to the excellent anode durability. It delivers a high reversible capacity of 570.6 mAh g −1 after 250 cycles at a current density of 0.5 A g −1 . Enhanced rate performance is also achieved with excellent capacity retention of 914.6 mAh g −1 at 0.1 A g −1 and 465.2 mAh g −1 at 2 A g −1 , respectively.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Jinrui Li,Zhongxin Zhuang,Zheng Guo,Zhonggang Liu,Xingjiu Huang
Exploiting advanced bimetallic oxide as sensing materials for electroanalysis offers new opportunity to improve the electrochemical performance, but still presents a tough challenge. Herein, we synthesized the uniform Fe 2 O 3 /Mn 3 O 4 nanocubes from a framework structure in a facile approach, which were developed as the electrochemical catalyst for individual and simultaneous analysis of Cu(II) and Hg(II) in 0.1 M HAc-NaAc buffer solution (pH5.0). It showed the excellent electrochemical behavior for the simultaneous analysis Cu(II) and Hg(II) with high sensitivities of 69.29 and 190.55 μA μM cm −2 . The corresponding limit of detection values (LODs) were calculated to be 3.94 nM and 1.39 nM, respectively. The excellent electrochemical behavior of Fe 2 O 3 /Mn 3 O 4 could be attributed to the large specific surface area, which could provide a large number of adsorption sites for Cu(II) and Hg(II). Meanwhile, the bimetallic Fe and Mn atoms arranged in the porous nanocubes could offer a synergistic effect and improve the electrochemical activity. Moreover, it could be successfully applied for the simultaneous analysis of Cu(II) and Hg(II) in real water samples with the favorable recovery rate. The results confirmed that the Fe 2 O 3 /Mn 3 O 4 nanocubes could serve as a reliable platform for the simultaneous analysis of Cu(II) and Hg(II).
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Haiyu Li,Hua Bai,Qing Lv,Wan Wang,Zhijuan Wang,Hong Wei,Qing Zhang
Quantum dots (QDs) have been widely used to develop analytical methods due to their unique fluorescent and photoelectrochemical characteristics. However, analytical strategies based on their catalytic property are rarely reported. Here, we demonstrate that the photoreductive ability of QDs can be utilized to develop a sensitive and selective colorimetric sensor for Cu(II). By using UV irradiation , 3,3′,5,5′-tetramethylbenzidine (TMB) is oxidized to its oxidation product, which can be reduced back to TMB by QDs. The presence of Cu(II) decreases the reductive activity of QDs and results in a color change in a signal-on format. The proposed sensor can be activated using a portable UV lamp or direct sunlight. Under optimized conditions, the detection limit (S/N = 3) is 10 nM via spectrophotometry and 0.1 μM by visible color change. This sensing system was applied to quantify Cu(II) in real samples, such as river water and tap water . Results were in agreement with those obtained using inductively coupled plasma spectrometry (ICP). This study may provide new ideas for the development of QD-based sensors.
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高影响因子
Chemical Engineering Journal Advances
·
2023
·
IF 0
Hongchao Li,Na Yuan,Chuan Wang,Xiaofei Yan,Jieshu Qian
Transition metal oxides have been recognized as promising catalysts for the activation of peroxymonosulfate (PMS), while the underlying mechanism involved in the relevant processes remains obscure. Here, we identify the reactive species generated in the CuFe 2 O 4 /PMS process and illustrate their roles in the degradation of aromatic compounds with different substituent groups (i.e., phenol and benzoic acid). Experimental results showed that free radicals (i.e., sulfate radicals (SO 4 •− ) and hydroxyl radicals (HO • ), surface Cu(III) species, and singlet oxygen ( 1 O 2 ) coexist in the CuFe 2 O 4 /PMS process. The free radicals are mainly responsible for the oxidation of aromatic compounds with electron-withdrawing group (i.e., benzoic acid), while the surface Cu(III) is the major reactive species for the removal of aromatic compounds with electron-donating group (i.e., phenol). In addition, 1 O 2 plays a negligible role in the oxidation of both benzoic acid and phenol. This study enhances the fundamental understanding of the underlying mechanism involved in the transition metal oxides-catalyzed PMS activation process.
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ULTRASONICS SONOCHEMISTRY
·
2019
·
IF 7.279
Baosong Li,Tianyong Mei,Dandan Li,Shengsong Du
Ni-Cu/TiN nanocomposites were electrodeposited by incorporation of TiN nanoparticles in Ni-Cu matrix from sulphate-citrate bath with additives. Ultrasonic assistance was performed in an external ultrasonic bath at ultrasonic frequency of 40 KHz and acoustic power of 300 W. The effects of current density on surface morphology, structural and electrochemical properties of Ni-Cu/TiN nanocomposites were examined. Results indicated that the presence of TiN changes the texture of nickel coating. Corrosion resistance of the composite deposit was enhanced by ultrasonic-assisted electrodeposition. The average roughness value ( R a ) of Ni-Cu/TiN is 26–34 nm, which is rougher than Ni-Cu alloy ( R a = 4–5 nm). Not only the ultrasonic agitation, but also the current density affects the corrosion properties of the products. Ni-Cu/TiN nanocomposite electrodeposited at 5 A dm −2 has the highest corrosion resistance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 33
·16183-16191
·
IF 3.925
Ping Ouyang,Rui Zhang,Jian Zhou,Haiyan Liu,Zhichang Liu,Chunming Xu,Shaojuan Zeng,Qian Su,Xiangping Zhang,Xianghai Meng
The effective electrochemical recovery of metal for bimetallic composite ionic liquid (IL) is related to the ion species and even the reaction mechanism under different Cu(I) contents. Thus, bimetallic composite ILs (Et3NHCl–1.54AlCl3–xCuCl, x = 0–0.23) were synthesized to investigate the Cu(I) speciation, voltammetric behavior and electrodeposition mechanism under different Cu(I) contents. For the cyclic voltammogram, three cathodic peaks of Et3NHCl–1.54AlCl3–0.010CuCl were related to the reduction of Cu(II) to Cu(I), Cu(I) to Cu(0), and Al(III) to Al(0), respectively. Meanwhile, for Et3NHCl–1.54AlCl3–0.23CuCl, the cathodic and anodic peaks were related to the redox reaction of copper. The whole offline detection of bimetallic composite ILs showed that the anodic reaction under low content of Cu(I) (≤ 0.60 wt%) was dominated by the generation of chlorine gas, while the cathodic reaction was related to the potential. However, when the Cu(I) content was higher than 2.23 wt%, only the disproportionation reaction of Cu(I) occurred and CuCl2 was obtained on the anode. Long-term electrodeposition showed that the effective recovery of copper from industrial bimetallic composite IL was realized. This study lays a good foundation for the clear understanding and comprehensive implementation of the resource utilization.
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INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Jianming Liu,Yao Feng,Juanjuan Yin,Tifeng Jiao
In this work, a new composite nanomaterial prepared by hydrothermal synthesis, it not only offers a convenient and stable method, but beneficial for the stable of nanomaterials. The obtained composite was explored use CNT-COOH and CuCl2, after deal with ultrasound and magnetic stirring then transferred to Teflon-lined stainless-steel autoclave for reaction. CNT-COOH not only increases the mechanical strength of the composite, but also provides a growth site of Cu nanocrystalline. The final production has a shorter reaction time for reducing 4-nitrophenol with NaBH4 than other products and has a high utilization rate. Studies have shown that the preparation of excellent nanocomposite has the potential for catalytic degradation.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Zhongwei Ge,Chenglei Wang,Tao Chen,Zhiyan Chen,Tong Wang,Liang Guo,Genggeng Qi,Jianqiang Liu
It has been reported that doping ZnO with metal ions can alter the band gap and immensely enhance electron transport . In this regard, to increase the efficiency of cost-effective dye-sensitized solar cells (DSSCs), we synthesized Cu-doped ZnO nanocomposites from layered double hydroxide (LDH) precursors via a facile method. LDH layers were homogeneously doped with Cu ions , and mixed metal oxides (MMOs) were obtained after annealing. The morphology and optical and electrochemical properties of the as-synthesized Cu-doped ZnO nanocomposites were systematically studied. The introduction of Cu ions increases the specific surface area of ZnO and increases light absorption in the visible region. The Cu-doped ZnO MMOs were used as the photoanode of DSSCs, and the effect of the amount of the Cu dopant on the performance of the solar cells was studied. At the optimal doping weight percentage of Cu (0.25 wt%), the solar cell based on Cu-doped ZnO MMO and D149 dye achieved the highest short-circuit current of 7.12 mA cm −2 and the highest power conversion efficiency of 1.50%.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Han Jiao,Yaru Li,Kaihua Gao,Jingyu Zhao,Chun Wang,Mingcheng Li,Ping Na
Electrochemical promotion technology, an environmentally friendly and facile strategy, is becoming increasingly attractive to researchers. In this work, a novel Cu@Cu 2 O foam block composite material was constructed through a one-step hydrothermal method. The product was then employed as the anode and electrified to catalyse removal of radioactive iodide ions (I − ) in the liquid phase. The removal rate of I − sharply increased to 96.65 % under electrification, which is a 4.5-fold increase over that without electrification. The current strength had an impact on this result, and the removal was still relatively high in a wide range of pH values. The composite material had good reusability and could maintain good performance after simple separation. Therefore, based on X-ray diffraction and X-ray photoelectron spectroscopy analysis, we proposed a mechanism of electrochemical oxidation and adsorption coupling for the iodine removal. As Cu@Cu 2 O adsorbed I − to form CuI, the current flow oxidised I − to I 2 , which finally was adsorbed by the formed CuI. Therefore, the current provides services of accelerating I − movement and oxidation. This coupling model of electrocatalytic oxidation and adsorption provides us with a new research method to remove iodide from water.
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