ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
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IF 4.872
Yupeng Wang,Qintie Lin,Rongbo Xiao,Shuailong Cheng,Haoyu Luo,Xiaoqing Wen,Libin Wu,Quanfa Zhong
This study investigated the application of a specific soil washing method to remove Cu and Pb from contaminated agricultural soil. To develop an efficient leaching agent of heavy metal compounds for use in farmland soil, a mixed chelator (MC) was prepared using potassium fulvic acid (PFA, 3.2%) and citric acid (CIT, 0.16 M) in a volume ratio of 4:1 (PFA:CIT = 4:1); the optimal solid-liquid ratio (S/L = 1:20), initial pH value (4.51) and contact time (360 min) were also explored. Under optimal conditions, the removal efficiencies of MC for Cu and Pb were 42.92% and 50.46%, respectively, both of which performed better than PFA (27.86% of Cu and 17.91% of Pb) and CIT (42.04% of Cu and 41.46% of Pb). The effective states, bioavailability and relative mobilities of Cu and Pb in soil were also efficiently reduced by MC, which also increased the stability of these elements, thereby lowering the risk to soil health. More importantly, MC not only had little effect on the soil physicochemical properties (e.g., pH, organic matter (OM), cation exchange capacity (CEC), ammonium nitrogen (AN), available phosphorus (AP) and rapidly available potassium (AK)), but also improved the restored soil. Furthermore, soil structure, surface elements and the enzyme activity did not exhibit significantly loss. Therefore, MC has great potential for remediating agricultural soil.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Xia-Xiao Wu,Yu Zhang,Tian Hu,Wei-Xiong Li,Zeng-Lin Li,Han-Jian Hu,Shui-Rong Zhu,Wen-Zhao Chen,Chu-Song Zhou,Gang-Biao Jiang
Bone related-bacterial diseases including wound infections and osteomyelitis (OM) remain a serious problem accompanied with amputation in most severe cases. In this work, we report an exceptional effective antibacterial alginate aerogel, which consists of tigecycline (TGC) and octahedral Cu crystal as an organo-inorganic synergy platform for antibacterial and local infection therapy applications. The alginate aerogel could greatly prolong the release of copper ions and maintain effective antibacterial concentration over 18 days. The result of in-vitro experiments demonstrated that the alginate aerogel has an exceptional effective function on antibacterial activity . Cytotoxicity tests indicated that the alginate aerogel has low biological toxicity (average cell viability >75%). These remarkable results suggested that the alginate aerogel exhibits great potential for the treatment of OM, and has a prosperous future of application in bone tissue engineering.
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Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 17
·3204-3216
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IF 5.958
Chaoyue Zhao,Xianming Zhang,Ziting He,Qingxin Guan,Wei Li
For acetylene hydrochlorination, as a substitute for toxic mercury catalysts, Cu-based catalysts are probably the most promising and highly active non-noble metal catalysts. Here, density functional theory (DFT) was used to reveal the mechanism for how the NMP ligand significantly promotes the activity and stability of the Cu-catalyzed acetylene hydrochlorination reaction. According to the experimental and DFT results, the high activity of the NMP coordinated Cu-based catalyst is attributed to the catalyst–ligand and substrate–ligand interactions, which stabilize the substrate-Cu(II)-ligand complex in the catalytic cycle. Moreover, the most important two stages were investigated in detail: the reduction of (i) Cuα+ to Cu0 and (ii) Cu2+ to Cu+ during the reaction process. The results demonstrate that the NMP ligand prevents high valence Cu2+ from being reduced due to the geometric distortion influence and the hydrogen bond interaction between the catalysts and ligands. Also, NMP could inhibit the carbon deposition by avoiding the formation of Cu(0) and its strong adsorption of acetylene on the surface.
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Fangke Zhan,Juanjuan Yin,Anqi Zhang,Jingxin Zhou,Mingli Wang,Tifeng Jiao
A seed-mediated co-reduction (SMCR) method that is simple to operate and produces heterogeneous components by the simultaneous co-reduction strategy to grow crystal was used to prepare a bimetallic nanomaterial, composed of two components of uniform metal elements. In this work, three different cationic surfactants were studied to control the morphology of bimetallic compound materials: cetyltrimethylammonium bromide (CTAB), cetyltrimethylammonium chloride (CTAC), and cetylpyridinium bromide (C16Py). Three mature and stable palladium crystal particles and the same number of Pd–Cu bimetallic nanomaterials (BNMs) products were obtained. The system of Pd and Cu bimetallic components, which has a large lattice mismatch, was grown uniformly by atomic layer-by-layer deposition under the SMCR method. The experimental results of BNMs for two nitro compounds (2-NA and 4-NP) were obtained by UV–vis spectral characterization. The prepared BNMs showed excellent catalytic ability in the reduction reaction and completed the catalytic reaction within 93 s. After eight consecutive catalytic cycles, the conversion of the catalytic reaction reached more than 90%. A set of surface-enhanced Raman scattering (SERS) experiments were also used to test the Raman enhancement properties of these BNMs, demonstrating a good SERS enhancement effect and good uniformity. These research results provide a new research topic for the exploration of morphology-controlled bimetal nanomaterials.
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VACUUM
·
2020
·
IF 2.906
Qiao Zhang,Yu Cheng,Baojiang Chen,Shuhua Liang,Longchao Zhuo
W–Cu composites that are strengthened with tungsten carbide ceramic particles have been proposed thanks to their high melting point, high hardness and excellent high-temperature mechanical properties . In this paper, tungsten carbide-reinforced W-25 wt% Cu composites were fabricated via an in situ synthesis technique that used mixed tungsten, copper and graphite powders. The impact of the graphite content on the microstructure and properties of the W–Cu composite was investigated. The results showed that tungsten carbide phases formed through the carbonization reaction of tungsten and graphite at high temperature. With the generation of tungsten carbide phases, the hardness, vacuum arc erosion resistance, high-temperature strength and wear resistance of the W–Cu composites were improved. The improvement was very significant for the W–Cu composites with an increase in the graphite content. However, the electrical conductivity was slightly sacrificed for the W–Cu composites. Moreover, the effects of the graphite on the comprehensive properties were evaluated and compared with those of reinforced with CNTs . Based on the laboratory properties and preparation cost of W–Cu composites, graphite can be used for the industrial fabrication of in situ self-generated tungsten carbide-reinforced W–Cu composites.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Dan Wang,Haijun Zhang,Yun Fan,Rong Cao,Yuan Gao,Jiping Chen
The direct chlorination of dibenzo- p -dioxin (DD) and dibenzofuran (DF) is an important source of dioxins in combustion flue gas . The chlorination reaction mainly occurs via electrophilic substitution induced by Cu and Fe chlorides, which must cohabit on particulate matters in mixed state. To explore the mechanism for DD/DF chlorination in real combustions flue gas, 8 kinds of CuO/Fe 2 O 3 /CuCl 2 /FeCl 3 composites impregnated onto silica powder were prepared to simulate the coexisting state of Cu and Fe species in combustion flue gas. Mixed Cu and Fe oxides and chlorides induced a significant synergistic effect on electrophilic chlorination of DD/DF. The efficiencies of DD/DF chlorination over composites containing both Cu and Fe species were 1–2 orders of magnitude higher than those over composites containing only Fe species at 250 °C. CuCl 2 species were highly active sites for electrophilic chlorination. FeCl 3 acted as an excellent promoter to accelerate DD/DF chlorination over CuCl 2 species. The elevated proportion of Cu and Fe oxides was also favora ble for electrophilic chlorination. Compared with DF, DD was more prone to be chlorinated. Chlorine substitution primarily occurred at 2, 3, 7 and 8 positions of DD and DF. Furthermore, the possible mechanism for synergistic effect on electrophilic chlorination of DD/DF was speculated.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 22
·27663-27673
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IF 3.056
Liu Yuan-zhen,Xu Qi-yan,Guo Rui-tang,Duan Chao-peng,Wu Gui-lin,Miao Yu-fang,Gu Jing-wen
The Cu/TiO 2 catalysts with the addition of Eu were developed by the sol-gel way for the selective catalytic reduction (SCR) of NO x by NH 3 . Activity tests revealed that CuEu/TiO 2 -0.15 catalyst showed the optimal de-NO x performance in a wide temperature range (150–300 °C), along with an admirable SO 2 tolerance. According to characterization analysis, the relationship between the NH 3 -SCR performance and physicochemical characters of samples was explored. The adjunction of Eu on Cu/TiO 2 catalyst can contribute to the formation of a large amount of Cu 2+ , adsorbed oxygen, and acid sites on the catalyst surface. Moreover, the Eu addition on Cu/TiO 2 is favorable to the generation of activated NO x and NH 3 substances adsorbed on the catalyst surface, which would conduce to the NH 3 -SCR process by Langmuir-Hinshelwood (L-H) mechanism effectively.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Chongqi Chen,Hongju Ren,Jianke Zhou,Yu Luo,Yingying Zhan,Chaktong Au,Xingyi Lin,Lilong Jiang
Two precursors, namely, p -CFO- T (tetragonal) and p -CFO- C (cubic), were fabricated by a sol-gel method via citric acid and poly(vinyl alcohol) complexation, respectively. After H 2 -reduction, the two were converted to Cu/Fe 3 O 4 catalysts of different complexions, which are named as CFO-CA and CFO-PVA, respectively. The distribution of Fe 2+ and Fe 3+ in the Cu/Fe 3 O 4 catalysts was studied by Raman and XPS techniques. It was disclosed that the distribution of Fe 2+ and Fe 3+ in Fe 3 O 4 has an effect on Cu–Fe 3 O 4 interaction and catalyst surface basicity . Compared to CFO-PVA, CFO-CA has a larger amount of Fe 3+ , which mostly sits at the octahedral sites, leading to stronger Cu–Fe 3 O 4 interaction, and a larger amount of catalyst surface sites that are of weak basicity. As a result, the critical elementary steps of WGS reaction , viz. water dissociation, –COOH decomposition and CO 2 desorption are promoted as reflected in the lower E a and higher catalytic activity of CFO-CA.
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Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Yuyu Liu,Zheng Chen,Xiaoqin Yang,Jinyong Zhang,Zhonggang Sun,Yuzeng Chen,Feng Liu
Different from the reported catalysts such as metallic glasses ribbons and ball-milled high entropy alloy powder, high entropy alloy nanoparticles (HEA NPs) have attracted wide attention for compelling and functional catalytic properties to degrade methylene blue (MB) dye. CoCrXFeNi (X = Al, Cu, Mn) HEA NPs with different loadings were synthesized by impregnation-adsorption method on activated carbon (AC). Nanoscale HEA NPs with maximized configuration mixing entropy are composed of a single solid-solution face-centered cubic (FCC) phase and the nanocomposites show distinctive porous architectures and large specific surface area (average S BET = 632.7 m 2 /g) for 10 wt.% loadings. The reaction rates ( k o b s ) of 10 wt.% CoCrAlFeNi and CoCrMnFeNi HEA NPs-AC for MB degradation are 0.1998 and 0.1830 min −1 and show comparable intrinsic catalytic performance to amorphous ribbons and HEA powders. The HEA NPs can effectively decompose MB molecule via nanoscale galvanic cell effect which provides a promising material in dye decomposition and mineralization.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wengao Zeng,Tao Cai,Yutang Liu,Longlu Wang,Wanyue Dong,Hui Chen,Xinnian Xia
Tungsten trioxide (WO 3 ) has a wide application in environmental remediation due to its stability. Yet, the application of WO 3 is severely limited by its wide band gap and weak electron reduction ability. In this work, we intend to enhance the visible light absorption and photocatalytic performance by constructing an organic-inorganic Z-scheme system WO 3 @Cu@PDI. Apparently, WO 3 @Cu@PDI has excellent visible light absorption and photocatalytic degradation ability in the degradation of tetracycline hydrochloride (TC). Under visible light irradiation, the degradation rate of composites is 40 times faster than that of sole WO 3 and 5 times than PDI. The photocatalytic activity of WO 3 @Cu@PDI toward TC still kept 85% after three reuses. We revealed that this high photoactivity arisen from the efficient carriers separation and the formation of Z-scheme junction. Importantly, this Z-scheme electron transfer pathway was confirmed by thorough experimental study. This work demonstrated the significant potential of WO 3 -based inorganic-organic Z-scheme photocatalyst in environmental remediation.
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RSC Advances
·
2019
·Vol. 9
·期 52
·30439-30447
·
IF 3.049
Yongsheng Wang,Zhenzhen Zhao,Yunlu Zhao,Xiaolin Lan,Weixiang Xu,Li Chen,Dongjie Guo,Zhengkang Duan
The sintering resistance of supported Cu nanoparticle (NP) catalysts is crucial to their practical application in the dehydrogenation of diethanolamine (DEA). In this paper, co-precipitation, hydrothermal synthesis, and sol–gel condensation are used to form a new support material through chemical bonding between graphene oxide and ZrO2. The composite carriers prepared by the three methods are mixed with copper nitrate and ground using a ball mill. A series of Cu/ZrO2-reduced graphene oxide (RGO) composites were prepared by calcination under nitrogen at 450 °C for 3 h and hydrogen reduction at 250 °C for 4 h. The conversion of DEA to iminodiacetic acid (IDA) reached 96% with the Cu/ZrO2-RGO catalyst prepared by hydrothermal synthesis. The conversion rate of DEA is more than 80% following the reuse of the CZG-2 catalyst for twelve cycles. The various physicochemical characterization techniques show that the Cu/ZrO2-RGO layered and wrinkled nanostructures can improve catalytic stability and suppress the sintering of the supported Cu NPs during the catalytic dehydrogenation of diethanolamine. A synergistic effect between the RGO and the Cu nanoparticles is observed. The Cu nanoparticles with RGO have a better dispersibility, and a new nano-environment is created, which is the key to improving the efficiency of diethanolamine dehydrogenation. These new Cu/ZrO2-RGO catalysts show increased durability compared to commercially produced Cu/ZrO2 catalysts and show promise for practical applications involving diethanolamine dehydrogenation.
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Soft Matter
·
2019
·Vol. 15
·期 47
·9727-9732
·
IF 3.399
Guanzhou Luo,Li Wang,Xinying Li,Kai Yang,Yongle Luo,Shouping Xu,Pihui Pi,Xiufang Wen
A facile method that combines alkali-assisted oxidation and –SH chelation with a click chemistry reaction was employed to create an F-POSS polymer surface (fluorinated octavinyl polyhedral oligomeric silsesquioxane polymer)-based Cu mesh (F-POSS-OM). The as-prepared F-POSS-OM surface displayed a cohering hierarchical nano-F-POSS polymer granule/micro-Cu(OH)2 wire structure, which provided a re-entrant geometry needed for liquid-repellency and low liquid sliding angles (<15°). Moreover, the easy-prepared structure endows the F-POSS-OM with remarkable durability for mechanical and chemical damages, including wear abrasion, tape-peeling, 100 cm-height hammer impact, severe hand twisting, strong acid/base/salt solutions, and high temperatures. Importantly, F-POSS-OM still retained excellent self-cleaning performance even after being subjected to these damages.
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