AQUATIC TOXICOLOGY
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2019
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IF 3.794
Mengdi Xie,Yingxue Sun,Jianfeng Feng,Yongfei Gao,Lin Zhu
Predicting the sublethal effects of pollutants to aquatic organism is essential in realistic chemical risk assessment. However, only a few dynamics models for sublethal endpoints are available. Here, we investigated the toxic effects of the essential metal Cu and the nonessential metal Cd on Chlamydomonas reinhardtii under both single and combined exposure, compared the effectiveness of different effect endpoints as toxic effect factors, and developed a Dynamic Energy Budget toxicology (DEBtox) model to predict the sublethal effects of Cu and Cd on C. reinhardtii . The results showed that the chlorophyll fluorescence parameter is a better toxic effect indicator than others for short-term exposure (<24 h), while algal cell growth is preferred for long-term exposure (2–6 days). The developed DEBtox model could successfully predict single metal toxicity to C. reinhardtii, while the combined metal DEBtox model slightly overestimates the joint toxicity of Cu-Cd due to the antagonistic effect of Cu-Cd on C. reinhardtii. This study is helpful to understanding and better predictions of metal sublethal toxic effects on aquatic organisms.
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Journal of Environmental Sciences
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2019
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IF 3.556
Yue Ma,Xiaodong Wu,Junyu Zhang,Rui Ran,Zhichun Si,Duan Weng
Selective catalytic reduction (SCR) with urea catalyzed by Cu-SAPO-34 is an effective method to eliminate NO x from diesel exhaust . However, urea-related deposits may form during cold-start and urban driving due to low exhaust temperatures. The activity of Cu-SAPO-34 at 175°C is significantly degraded by urea exposure, and 300°C is required for regeneration. Through in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temperature-programmed hydrolysis studies, the dominant stable deposit at 175°C is identified as biuret, which can be eliminated at 300°C. The urea-derived deactivation and regeneration mechanisms of Cu-SAPO-34 were compared with those of anatase-supported catalysts.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Yu Zhang,Pengli Zhu,Gang Li,Zhen Cui,Chengqiang Cui,Kai Zhang,Jian Gao,Xin Chen,Guoqi Zhang,Rong Sun,Chingping Wong
Elliptic Cu–Ag nanoflakes were syntheszied via facile in situ galvanic replacement between prepared Cu particles and Ag ions. Alloy nanoflakes with high purity and uniformity present a size of 700 × 500 nm, with a thinness of 30 nm. Nontoxic and low-cost polyvinyl pyrrolidone was used as a dispersant and structure-directing agent, promoting the formation of the remarkable structure. Synthesized nanoflakes were utilized as a filler for conductive paste in an epoxy resin matrix. Conductive patterns on flexible substrates with a resistivity of 3.75 × 10–5 Ω·cm could be achieved after curing at 150 °C for 2 h. Compared with traditional silver microflakes, smart alloy nanoflakes provide much improved conductive interconnection, whose advantage could be attributed to their nanoscale thicknesses. It is also noteworthy that the conductive patterns are able to tolerate multiple bendings at different angles, having good conductivity even after 200 repeated bendings. Therefore, alloy nanoflakes could be a promising candidate conductive filler for flexible printing electronics, electronic packaging, and other conductive applications.
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RSC Advances
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2019
·Vol. 9
·期 27
·15642-15647
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IF 3.049
Fuping Tian,Chenxia Qiao,Renyu Zheng,Qiaofeng Ru,Xin Sun,Yifu Zhang,Changgong Meng
A bimetallic–organic porous material (Cu/Co-BTC) with a paddle-wheel structure has been successfully synthesized by a solvothermal approach. The as-synthesized materials were characterized by XRD, SEM, ICP-AES, UV-Vis, TGA and N2 adsorption at 77 K. The prepared Cu/Co-BTC samples were investigated in thiophene (TP) adsorption from model gasolines by the fixed bed adsorption method at 298 K. The results showed that only a small amount of Co could be successfully introduced into the framework of HKUST-1, and the introduction of Co had little effect on the crystalline structure, morphology, porosity, and thermal stability. The bimetallic Cu/Co-BTC with a Cu/Co ratio of 174 displayed significantly improved adsorption desulfurization performance, showing an increase in breakthrough volume by 30% compared with HKUST-1, implying that the central metal in the MOF plays an important role in adsorption desulfurization. The addition of toluene or cyclohexene (3.20–3.30 vol%) as a competitor in the model gasoline led to a decline in desulfurization performance, especially when cyclohexene was added. The bimetallic Cu/Co-BTC showed a slight loss in breakthrough volume by only 5% after regenerating 7 times, displaying an excellent regeneration property.
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Inorganic Chemistry Frontiers
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2019
·Vol. 6
·期 7
·1799-1812
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IF 5.934
Xiaosong Hu,Chaoyue Zhao,Qingxin Guan,Xin Hu,Wei Li,Jun Chen
The chemical transformation of CO2 not only mitigates CO2 released into the atmosphere but also produces fuels and chemicals with important additional value. The activation of stable CO2 molecules is the key difficulty for the efficient conversion of CO2. Herein, we designed a ternary catalyst containing Cu, ZnO, and CeOx and dispersed them in SBA-15 using incipient wetness impregnation. Interestingly, the catalytic performances were improved greatly when the related active components were dispersed inside and outside the pore channels of SBA-15 using the incipient wetness impregnation method. Methanol and CO were controllably produced on the interface of Cu and metal oxides (ZnO and CeOx) due to the synergistic effects between the three active components. The metal oxides play a more important role in CO2 conversion as well as the product selectivity compared to Cu. CeO2 is more efficient than ZnO in promoting the dispersion of Cu nanoparticles and methanol generation. The suitable pore channels of SBA-15 promote the mass transfer and heat transfer while the high specific surface area is favorable to the dispersion of active components, which will facilitate the production of methanol and CO. After continuous hydrogenation evaluation for 100 h, the catalytic performance of the catalyst was still very stable. This work provides a viable strategy to prepare a supported catalyst with highly dispersed active sites, and the catalyst exhibits an efficient catalytic effect on producing methanol and CO.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Yaowen Bai,Qinzhi Wang,Chunbao Du,Tong Bu,Yingnan Liu,Xinyu Sun,Weifang Luo,Rui Li,Yijian Zhao,Xiaohan Zheng,Li Wang
Developing a facile method to fabricate new heterogeneous Metal-Organic Framework (MOFs) based catalysts with high catalytic activity and stability has drawn significant attention. Herein, we demonstrate a simple in-situ pyrolysis reduction strategy to fabricate a novel three-dimensional (3D) Cu-based catalyst, which displays an outstanding performance for the decomposition of 4-nitrophenol (4-NP). Detailed characterization including SEM , FTIR, XPS , ICP-OES, HRTEM , SAED , XRD and BET confirmed the formation of the Cu/C porous composites (Cu/C-PC). Taking advantage of enormous Cu particles in the composite as well as ultrahigh surface area (196.7 m 2 /g) of carbon support, Cu/C-PC presents prominent catalytic activity for the hydrogenation reduction 4-NP to 4-aminophenol (4-AP) with apparent rate constant ( K app ) of 0.0267 s −1 (the ratio of K app to the catalyst amount is 119 s −1 g −1 ), which is dramatically higher than that previous reports. On the contrary, after being washed successively (Cu/C-PC-AW) by FeCl 3 , HCl aqueous solution and deionized water , the Cu/C porous composite materials exhibit fairly weak catalytic activity. The catalytic performance of Cu/C-PC is better than Cu, Cu 2 O and CuO nanoparticles as well as other catalysts in previous reports. Furthermore, Cu/C-PC shows excellent reusability, indicating its potential applications in treatment of water pollution.
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ACS Applied Nano Materials
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2019
·
IF 0
Guimin Zhang,Ji Feng,Shuai Wang,Bozhe Xu,Wenqiang Ding,Weimin Wang,Zhengyi Fu
This paper reports a seed-mediated growth of Pd@Cu core–shell nanocubes with controllable edge lengths from 49 to 103 nm in an aqueous system using cetyltrimethylammonium bromide (CTAB) capped Pd nanocubes with sizes of 21 nm as seeds. During the growth, ascorbic acid (AA) was served as the reductant and hexadecylamine (HDA) as the capping agent and ligand to form a coordination complex with Cu2+. The edge lengths of Pd@Cu nanocubes could be finely tuned by changing the volume of Pd seeds while maintaining the amount of CuCl2 precursor. Cu atoms initially nucleated on one or two faces of a Pd seed via localized epitaxial growth. Due to the lattice mismatch between Pd and Cu (7.1%), Pd cores were not located in the center of Cu shells during the initial deposition of Cu. Interestingly, most of Pd cores could transfer to the center of Cu nanocubes by dissolving and regrowing of the boundary to decrease the interfacial strain when a sufficient amount of CuCl2 precursor and reaction time were provided. The Pd@Cu nanocubes exhibited strong LSPR signals and long-term stability which could be a low-cost potential substitute for Au and Ag for applications in sensing, surface-enhanced spectroscopy, optoelectronics, and photocatalysis. By comparison of the rate constant of p-nitrophenol reduction reaction over Pd@Cu nanocubes with different sizes as catalyst, 83 nm Pd@Cu nanocubes showed the highest catalytic activity.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Nuanqin Zhang,Chengjie Xue,Kuang Wang,Zhanqiang Fang
In this study, a novel Cu-V bimetallic catalyst (CuVOx) with abundant surface defects was successfully synthesized by hydrothermal method. Degradation experiment of emerging pollutant fluconazole confirmed that CuVOx exhibited higher catalytic activity, wider pH applicability and more satisfactory reusability than monometallic copper compounds. Electron paramagnetic resonance and radical quenching tests indicated that surface hydroxyl groups play a crucial role in the degradation of contaminants. By the introduction of vanadium into copper-based materials, several surface properties that are closely related to the reactivity of the copper catalysts such as adsorption capacity, surface defects, and active sites concentration were improved. It was also found that the electron-rich center around Cu/V active sites and surface oxygen vacancies are responsible for the rapid dissociation of H 2 O 2 and the efficient catalytic oxidation of fluconazole in CuVOx Fenton system. We also applied CuVOx Fenton to the degradation of various refractory organic pollutants, further confirming its excellent removal and detoxification efficiency for organic pollutants in the aquatic environment.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
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IF 3.571
Yafu Tang,Shanmin Hou,Yuechao Yang,Dongdong Cheng,Bin Gao,Yongshan Wan,Yuncong C. Li,Zhen Yu,Yuanyuan Yao,Jiazhuo Xie
The complex synthesis process, low utilization, and single function of fungicides have seriously hindered the development of fungicides in resistance to rice sheath blight. Here, an inexpensive and multifunctional Cu(II)-based water-dispersible humic acid (Cu-WH) fungicide with growth-promoting ability was developed with a simple method. A 3D molybdate carbon hierarchical nanosphere (MoO2-C-HN) catalyst was successfully synthesized using a green route and applied in a solid-phase activation of lignite to obtain water-dispersible humic acid. Cu(II)-based water-dispersible humic acid (Cu-WH) was then formed through a simple reaction of Cu(II) and the humic acid. The resultant Cu-WH showed strong antifungal performance against Rhizoctonia solani in laboratory incubation experiments. After being treated with Cu3-WH (0.1 mg L–1), the control efficiency of rice sheath blight at 1, 3, and 5 days after infection was 90.54%, 78.96%, and 66.31%, respectively. It also enhanced the water-holding capacity of the substrate and thus effectively improved the growth of rice seedlings. In comparison to commercial rice seedling substrate, the substrate treated with 8 wt % of Cu3-WH increased plant height, stem diameter, fresh weight, and chlorophyll content by 19.23%, 35.91%, 14.52%, and 42.85%, respectively. The newly developed Cu-WH thus can be used as a novel low-cost efficient fungicide and growth stimulator to treat rice sheath blight as well as to increase rice production.
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CHEMOSPHERE
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2019
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IF 5.108
Yulin Yang,Ying Liu,Xian Fang,Wei Miao,Xiaoyan Chen,Jing Sun,Bing-Jie Ni,Shun Mao
Transition metal and nanocarbon-based composites with high activity and stability draw great attention in electro-Fenton system for organic pollutants removal . In this study, HKUST-1-derived Cu@C nanoparticles embedded within three-dimensional reduced graphene oxide (rGO) network (denoted as 3DG/Cu@C) is synthesized through a simple strategy. The prepared catalyst shows ordered 3D porous carbon structure and Cu@C NPs are uniformly dispersed in the matrix. The 3DG/Cu@C is used as heterogeneous electro-Fenton (hetero-EF) catalyst and shows outstanding performance in various persistent organic pollutants removal. High concentration Rhodamine B (RhB) (40 mg L −1 ) can achieve a complete decolorization within 150 min with 25 mg L −1 3DG/Cu@C catalyst, which is one of the lowest catalyst dosages in hetero-EF for RhB removal. More importantly, the 3DG/Cu@C achieves high RhB mineralization efficiency of 81.5% and exhibits high catalytic performance in a wide pH window from 3 to 9. The 3DG/Cu@C also remains high efficiency after five successive reaction cycles. The working mechanism study shows that RhB is mainly oxidized by • OH and O 2 •- radicals through hetero-EF and anodic oxidation processes. The high stability and outstanding performance of 3DG/Cu@C provide new insights in organic pollutants removal by hetero-EF process with transition metal and nanocarbon-based catalysts.
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Arabian Journal of Chemistry
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2020
·
IF 4.762
Zefeng Yu,Weifeng Song,Jiayao Li,Qiuhua Li
In this paper, a metakaolin-based mesoporous geopolymer (GP-CTAB) was used as adsorbent for Cu(II) and Cr(VI) through a novel and simple synthetic route using cetyltrimethylammonium bromide (CTAB) as an organic modifier. The application of GP-CTAB for the simultaneous removal of metal anions and cations in aqueous solution was studied for the first time. The results of X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Brunauer, Emmett and Teller (BET), and Barrett, Joyner, and Halenda (BJH) methods indicate that GP-CTAB is still geopolymer even in the presence of quaternary ammonium salt cations. The material was tested to simultaneously adsorb Cu(II) and Cr(VI) from an aqueous solution. The results show that GP-CTAB can adsorb anions simultaneously without sacrificing the adsorption properties of heavy metal cations, which is superior to conventional geopolymers. The maximum theoretical adsorption capacity of GP-CTAB for Cu(II) and Cr(VI) was 108.2 mg/g and 95.3 mg/g in the binary system, respectively. It was also found that the presence of Cu(II) in the solution promoted the adsorption of Cr(VI). Given this characteristic of GP-CTAB, it has shown great application prospects in the prevention and control of heavy metal pollution.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Honghua Zhang,Jiakuo Xu,Hongguo Tang,Zhiqiang Yang,Ruixia Liu,Suojiang Zhang
Different metal compositions based on metal-ion-modified X-type zeolite in the isobutane/2-butene alkylation reaction were investigated. Bimetallic (rare earth (RE) and Cu) supported zeolites catalysts owned better lifetime and selectivity than those modified by the single metal (La, Ce, or Cu). CuLaX performed best with a 15 h catalytic lifetime obtained after hydrogen activation when the content of copper was 0.197 mmol/g. The possible reason is that the RE X-type catalyst modified with copper ion increases the concentration of strong Brønsted acid sites, which is more favorable for the hydride transfer in the alkylation. Herein, the valence of copper ions is of importance to the alkylation performance. A mechanism was proposed wherein the existence of Cu+ inhibited the progress of the oligomerization reaction and then prolonged the lifetime of the catalyst through decreasing the desorption concentration of 2-butene in the active site.
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