Journal of Water Process Engineering
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2022
·
IF 7.34
Peng Xu,Pengfei Zhu,Xin Liu,Zhuoyu Yang,Jingwei Ma,Qiulai He
Fe 2+ activated peroxodisulfate (Fe 2+ /PDS) system has been widely studied for its efficient degradation of pollutants. However, the slow circulation of Fe 3+ /Fe 2+ greatly restricted the application of the system. In the study, AOII was significantly degraded by using Fe 3+ coupled with Cu 0 activate PDS system (Fe 3+ /Cu 0 /PDS system). Compared with the traditional Fe 2+ /PDS system, the Fe 3+ /Cu 0 /PDS system greatly improved the degradation of AOII and the decolorization rate reached 80.6 % within 30 min. The quenching experiments and electron spin resonance (EPR) showed that both hydroxyl radical (•OH) and sulfate radical (SO 4 •− ) were the mainly primary reactive oxygen species in the Fe 3+ /Cu 0 /PDS system with the contribution rates of SO 4 •− and •OH being 60.54 % and 25.06 % respectively. In the Fe 3+ /Cu 0 /PDS system, Cu 0 formed Cu + through H + corrosion and PDS/O 2 oxidation . Then, Cu + oxidized by O 2 to produce H 2 O 2 and Fe 3+ was reduced by Cu 0 and Cu + to form Fe 2+ . Finally, Cu + and Fe 2+ catalyzed PDS to generate SO 4 •− , and •OH was yield by the process of Cu + and Fe 2+ induced H 2 O 2 and the reaction of OH − /H 2 O and SO 4 •− . Common water matrices such as NO 3 − and SO 4 2− had no effect on the degradation, while Cl − promoted the degradation, and CO 3 2− and fulvic acid inhibited the degradation of AOII. Over 68.5 % of AOII was degraded in the experimental water samples and the Fe 3+ /Cu 0 /PDS system had great degradation performances in practical water sample of other contaminants. Moreover, the final discharge of total dissolved copper was <1 mg/L after sediment and filtering.
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Journal of the American Chemical Society
·
2022
·
IF 16.383
Ling Luo,Linan Wang,Jianbang Chen,Jiazheng Zhou,Zhihua Yang,Shilie Pan,Junjie Li
Large second-harmonic generation (SHG) response and broad band gap are two important and competitive parameters. It is difficult to balance them out in one material. In this work, by coupling alkali earth metal (AEM) octahedra with large highest occupied molecular orbital (HOMO)–lowest unoccupied molecular orbital (LUMO) gap and nonlinear optical (NLO)-active tetrahedra units, nine noncentrosymmetric (NCS) compounds, belonging to a new quaternary chalcogenide family AIB3IIC3IIIQ8VI with unique windmill-like [Mg3M3IIIQ24] (MIII = Al, Ga; Q = S, Se) units constructed by alternated [MgQ6] octahedra and [MIIIQ4] tetrahedra, are rationally designed and fabricated. The compounds show a stable structural framework but adjustable optical properties. Among them, NaMg3Ga3Se8 shows a large SHG response (∼1 × AgGaS2 (AGS)), wide band gap (in selenide) (2.77 eV), high laser-induced damage threshold (LIDT) (∼2.3 × AGS), and suitable birefringence (0.079@546 nm). It should be a potential candidate for infrared (IR) nonlinear optical (NLO) materials. The results enrich the chemical diversity of chalcogenides and open an avenue for the development of new IR NLO materials through the octahedra and tetrahedra coupled strategy.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaoping Liu,Yunbo Zhai,Zhixiang Xu,Liming Liu,Wanying Ren,Yu Xie,Caiting Li,Yun Zhu,Min Xu
The high water content of sewage sludge increases the processing costs and hampers its further disposal. Fenton technology has proven to be efficient and been widely used to enhance sludge dewaterability, but it usually needs acidification and subsequent neutralization, thus consuming a lot of chemicals. It’s well documented that hydroxyl radicals produced in various Fenton or Fenton-like reactions play a crucial role in sludge dewatering. Based on the latest study, Cu + and Cu + /H 2 O 2 pretreatments for the enhanced dewaterability of sludge without extra pH adjustment were proposed. Results showed that Cu + with and without H 2 O 2 can significantly improve the dewatering performance of sludge, which was ascertained by a capillary suction time (CST) reduction rate of about 80 %. The proteins and polysaccharides in tightly-bound extracellular polymeric substance (TB-EPS) were decreased, while increased in soluble extracellular polymeric substance (S-EPS). In addition, a hydrophobic and porous surface was formed, and zeta potential increased after conditioned. These changes may release bound water and thus improve sludge dewaterability. The results of electron spin resonance and scavenging tests signaled that the Cu 3+ was mainly accountable for the dissolution of EPS, rather than the hydroxyl radicals ( OH). Our results substantiate and untangle a distinct reinforcement mechanisms for sludge dewatering by high valent copper (Cu 3+ ). This study demonstrates for the first time that Cu 3+ plays an important role in sludge dewatering, which has long been credited to hydroxyl radicals. It also urges re-evaluation of the Fenton(-like) system for sludge dewatering, given that Cu 3+ could also cause potential oxidative destruction of EPS compared with reactive oxygen species.
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JOM
·
2022
·Vol. 75
·期 5
·1515-1529
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IF 2.597
Ge Yang,Liu Zhihong,Yu Zhiqian,Wang Huanwen,Lu Xingwu,Zhang Leru,Xia Longgong
The present study focused on the Cu-Pb system and investigating the distribution behaviors of various minor elements through the equilibration-quenching-EPMA analysis experimental technique. Obtained results showed that: (1) An intermetallic compound consisting mainly of Cu-Pb-Se-Te formed below 956°C. (2) As, Sb and Sn had similar distribution behaviors, which mainly entered the solid Cu phase at the temperature range of 500–900°C, but became concentrated in the liquid alloy phase at temperature range of 900–1060°C, and their distribution ratios increased along with increasing temperature. (3) Bi was mainly found in the liquid alloy phase, and its distribution ratio ranged from 6.8 to 836.5 at the experimental conditions. (4) Se and Te formed an intermetallic alloy phase under 900°C, and they enriched in the liquid alloy phase between 960°C and 1060°C. (5) Au was mainly found in the solid Cu phase at the temperature range of 500–900°C, and its distribution ratio was about 1.5 at 900–1060°C. The distribution ratio of Ag decreased from 8.7 to 2.3 when increasing the temperature from 500°C to 1060°C. Distribution behavior of As, Sb, Bi and Sn is consistent with their interfacial enthalpies with Cu and Pb.
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高影响因子
Water
·
2022
·Vol. 14
·期 21
·3450
·
IF 3.53
Wei Zhou,Yu Li,Min Zhang,Guang-Guo Ying,Yong Feng
In this study, chalcopyrite (CuFeS2), a natural mineral with a bimetallic structure, was used as the activator to generate radicals for removing organic pollutants from aqueous solutions via the activation of peroxymonosulfate (PMS). Sulfisoxazole (SIX), a sulfonamide antibiotic, was selected as the model pollutant. The results showed that chalcopyrite was highly reactive toward the activation of PMS; under the conditions of 50 µM PMS and 1 g/L chalcopyrite, approximately 95.7% of the SIX was degraded after reaction for only 5 min. An increase in the loading of chalcopyrite (0.25–2 g/L) promoted the degradation of SIX, while elevated levels of PMS (0.05–0.5 mM) slightly retarded the degradation kinetics. Although the best performance was observed under acidic conditions (pHs 3 and 4), near complete degradation of SIX was also achieved at pH 5.5. Identification of reactive species revealed that both a hydroxyl radical and a sulfate radical were formed in chalcopyrite–PMS oxidation, and they were responsible for the degradation of SIX. Trace amounts of copper and iron were leached out from chalcopyrite during the activation, and both the heterogeneous and homogeneous activation of PMS contributed to the generation of oxidizing radicals. Common water constituents including Cl−,HCO3−, and natural organic matter at their environmentally relevant levels showed a limited effect on the degradation of SIX, which suggests that chalcopyrite–PMS oxidation has high reactivity and stability in the degradation of organic pollutants and shows great practical application potential.Keywords:peroxymonosulfate;CuFeS2;sulfate radicals;sulfide mineral;water matrices
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高影响因子
POLYMERS & POLYMER COMPOSITES
·
2022
·
IF 1.841
Shidong Zhou,Xiaoxing Niu,Xiuli Zhang,Yuanliang Zhao
The synergistic effect of silica (SiO2) and copper (Cu) nanoparticles in polyimide (PI) on the friction interfacial deformation of polyethersulfone/polyimide (PES/PI) blends was studied. Results indicate that the effect of SiO2 and Cu nanoparticles on the tribological performance of PES/PI nanocomposites is quite different from each other. The addition of SiO2 nanoparticles into PI improves the antifriction of PES/PI nanocomposites by 24.4%, but has little effect on the wear resistance. The incorporation of Cu nanoparticles into PI enhances the wear resistance of PES/PI nanocomposites by 55.5%, but has little effect on the antifriction. PES/PI nanocomposites achieve the better comprehensive tribological performance when the content of SiO2 and Cu is 0.8 wt and 0.2 wt%, respectively. The friction interfacial deformation analysis reveals that SiO2 in PI improve the continuity and uniformity of deformation in friction interface and reduce the severe wear of transfer film. Cu nanoparticles in PI improves the continuity but not the ununiformity of deformation. Thus, the abrasive wear of counterpart ball is severe. The synergistic effect of SiO2 and Cu nanoparticles in PI improves the continuity and uniformity of friction interfacial deformation, which contributes to the improvement of friction and wear of PES/PI nanocomposites.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Junao Zhang,Xin Xie,Xi He,Xiangnan Gong,Xin Zhang,Anping Liu,Yingzhou Huang
Surface-enhanced Raman Spectroscopy (SERS) has emerged as a powerful and sensitive technique for the detection of various molecules, including gaseous analytes. However, the development of efficient, stable, and reusable SERS substrates for gaseous molecule remains a challenge. This work introduces a novel Cu-Ag@ZIF-8 film for SERS detection of gaseous molecule, which consists of Ag nanoparticles (AgNPs) core and ZIF-8 porous shell on Cu foils. With strong enhancement of electromagnetic field by AgNPs core and effective caption of gaseous molecule by ZIF-8 porous shell, this substrate exhibits good SERS performance of p-aminothiophenol (PATP) and 4-mercaptophenol (DP) gaseous molecules, whose limit of detection (LOD) could reach 9.12 × 10 −10 M and 9.91 × 10 −9 M, respectively. Furthermore, the detection of gaseous benzaldehyde diffused by oil paint is explored by this developed SERS substrate for application. To achieve accurate identification of harmful gaseous molecule in complex volatile organic compounds (VOC), the deep learning (DL) approach is performed based on SERS spectra obtained from this Cu-Ag@ZIF-8 film. Our results demonstrate that the identification of gaseous benzaldehyde in VOC diffused from commercial oil paint has a high accuracy at 97.7% with the help of ANN algorithms, which points out the Cu-Ag@ZIF-8 film has good performance and huge potential for SERS detection of gaseous molecule.
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高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Zhen Zhang,Zhao Qin,Ming Zhang,Yifan Jiang,Chao Chen,Jiankan Zhang,Fengqi Zhao
The carbon dots (CDs) were prepared by the oxidation etching method. On this basis, the composite materials of CDs and Cu (CDs/Cu) were synthesized by the hydrothermal method . The elemental composition, morphology and structure were analyzed by TEM, SEM, EDS , XRD and XPS . The effects of CDs and CDs/Cu for thermal decomposition of TKX-50 pyrolysis were studied by DSC-FTIR-MS and in-situ solid FTIR . The CDs and CDs/Cu reduced the low-temperature decomposition peak temperature of TKX-50 by 10.1 ℃ and 16.1 ℃ respectively (10 ℃·min −1 ), and the second decomposition peak almost disappeared. This is because CDs and CDs/Cu can effectively facilitate the thermal decomposition of TKX-50 into NH 2 OH and 1,1′-ditetrazole diol (BTO). The CDs can promote the direct decomposition of BTO into small molecule gases and stable polymers at the initial pyrolysis stage. And they inhibit the combination of BTO and NH 3 into 5,5′-bistetrazole-1,1′-didiolate (ABTOX), which is more difficult to decompose. So, the HCN and N 2 /CO were increased obviously during pyrolysis while NH 3 and H 2 O content were decreased. On the other hand, the CDs/Cu promotes the decomposition of NH 2 OH in the first reaction. It manifested as the increase of NH 3 and H 2 O. At the same time, the CDs/Cu facilitates the transition of difficult to decompose ABTOX losing NH 3 to BOX to accelerate thermal decomposition reaction , playing a synergistic catalytic effect. Thus, in-situ solid FTIR signal of ABTOX was significantly weakened and the total content of NH 3 was raised, especially the significant expansion of NH 3 in the second stage. Finally, the influence of the catalysts in ignition characteristics was contrasted and discussed. Under the lower-power density region, the CDs and CDs/Cu decreased the ignition delay time of TKX-50. The CDs/Cu caused the flame propagation velocity of TKX-50 faster. Therefore, the CDs and their composites, as another new lightweight carbon material, are expected to be applied in the catalytic combustion of energetic materials.
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高影响因子
POLYMER
·
2023
·
IF 4.6
Chaoji Xiong,Hao Wang,Zhengbiao Zhang,Kun Liang,Chunhua Wu,Wei Wu,Xiaoping Rao,Qian Chen
Recently the research on the materials for removal of heave metals is surging rapidly. Here we have studied four triazine-based sulfur-containing polymers with different linkers, namely PDT1, PDT2, EDT1, and EDT2. They have been successfully synthesized by the nucleophilic substitution reaction of cyanuric chloride with propane-1,3-dithiol ( PDT1 and PDT2 ) and ethane-1,2-dithiol ( EDT1 and EDT2 ) in different ratios. The physical and chemical properties of these polymers were characterized by scanning electron microscopy, energy dispersive spectroscopy , Fourier transform infrared spectroscopy , porous structure analysis and X-ray photoelectron spectroscopy. The optimized adsorption condition was established by examining dosing, co-existing substances, contact time, concentration, temperature and pH values. The adsorbing properties, which was mainly described by the pseudo-second-order kinetic and Langmuir isothermal model, indicated that the sorption of Hg 2+ was the chemical adsorption . The maximum Hg 2+ sorption capacities of PDT1 , PDT2 , EDT1 and EDT2 were 1440.97 mg g −1 , 715.99 mg g −1 , 237.87 mg g −1 and 181.48 mg g −1 , respectively. Thermodynamically, the adsorption of Hg 2+ by the adsorbent is a spontaneous process. Cyclic experiments demonstrated that all the adsorbents could be reused in five successive adsorption cycles without significant losses in performance. Our density functional theory calculations in combination with relevant experimental results revealed the coordination geometry of Hg and hence mercury-adsorbent chelation mechanism. These results suggested that triazine-based sulfur-containing polymers could be utilized as effective adsorbents for the removal of Hg 2+ from polluted water.
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高影响因子
Coatings
·
2023
·Vol. 13
·期 11
·1963
·
IF 3.4
Hongbin Wang,Rui Zhou,Huangping Yan,Hongjun Liu
In this work, 3D periodic “grid-type” CuO/Cu2O layers were fabricated on a copper sheet using laser processing techniques, and the laser processing parameters were optimized for favorable ZnO nanowire growth. It was found that ZnO nanowires could be successfully prepared to form a CuO-Cu2O-ZnO heterojunction structure without an extra catalyst or seed layer coating, which could be attributed to the copper oxide active sites induced via laser texturing. ZnO nanowires on laser textured “grid-type” copper substrates demonstrated an effective piezocatalytic performance with different morphologies and the generation of abundant reactive oxygen species in the CuO-Cu2O-ZnO catalytic system, providing a fundamental mechanism for the degradation of organic dye in water. This simple and low-cost method could provide a useful guide for the large-scale efficient and versatile synthesis of immobilized piezoelectric catalysts.Keywords:laser processing;ZnO heterojunction;piezocatalytic;wastewater treatment
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Changcheng Cui,Junjie Fu,Dongxing Kou,Yimeng Li,Hao Wei,Zucheng Wu,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Shuping Pang,Zhipeng Shao,Sixin Wu,Guanglei Cui
The Cu 2 ZnSn(S,Se) 4 solar cells (CZTSSe) are emerging as a hot area of low-cost thin film photovoltaic technology owing to its non-toxicity and excellent photoelectric properties. However, the large open-circuit voltage deficit ( V oc,deficit ) caused by the inherently defective CdS/ CZTSSe heterojunction interface is still a huge challenge for improving power conversion efficiency. Herein, we reconstruct the heterojunction interface by inserting a CZTSSe:In into the CdS/CZTSSe heterojunction through an In 2 Se 3 post-deposition treatment. The local occupation of In 3+ at Zn 2+ and Sn 4+ sites decreases the disordered Zn- and Sn-related deep defects and generates benign In Zn donors within CZITSSe transition layer simultaneously, which effectively enhances the surface p-to-n conversion. The combination of chemical and field-effect passivation regulates the charge extraction and passivates the charge recombination. As a result, the In element-buried absorber enables the V oc boost from 488 to 527 mV with an impressive active-area efficiency of 13.59 %. These results demonstrate the great potential of the In element-buried absorber in alleviating the V oc,deficit and enhancing the performance of CZTSSe solar cells.
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高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Yuxiang Yan,Yuxin Cao,Zhichao Wang,Ka Wang,Hengdong Ren,Shaoqi Zhang,Yi Wang,Jian Chen,Yong Zhou,Lizhe Liu,Jun Dai,Xinglong Wu
Rational design of efficient and robust earth-abundant alkaline hydrogen evolution reaction (HER) catalysts is a key factor for developing energy conversion technologies. Currently, antiperovskite nitride CuNMn 3 has garnered significant interest due to its remarkable properties such as negative/zero thermal expansion and magnetocaloric effects. However, when utilized as hydrogen evolution catalysts, it encounters large challenge resulting from excessively strong/weak interactions with adsorbed H on Mn/Cu active sites, which leads to low HER activity. In this study, we introduce an asymmetric orbital hybridization strategy in Zn-doped Cu 1− x Zn x NMn 3 by leveraging the localization of Zn electronic states to reconfigure the electronic structures of Cu and Mn, thereby reducing the energy barrier for water dissociation and optimizing Cu and Mn active sites for hydrogen adsorption and H 2 production. Electrochemical evaluations reveal that Cu 0.85 Zn 0.15 NMn 3 with x = 0.15 demonstrates exceptional electrocatalytic activity in alkaline electrolytes. A low overpotential of 52 mV at 10 mA cm −2 and outstanding stability over a 150-h test period are achieved, surpassing commercial Pt/C. This research offers a novel strategy for enhancing HER performance by modulating asymmetric hybridization of electron orbitals between multiple metal atoms within a material structure.
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高影响因子
危险品化学品经营许可证（带存储）