APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Wenyang Fu,Yingying Du,Jiana Jing,Chunhong Fu,Minghua Zhou
Electrochemical reduction of nitrate to ammonia (ERNA) is a new process to recycle nitrogen resource from nitrate polluted wastewater. Nevertheless, how to optimize active sites on electrode to improve activity is a key challenge. Here, we proposed that building interfacial electric field could enhance ERNA. XPS analysis, DFT calculations and in-situ electrochemical measurements confirmed that high Fermi level of Cu (1.09 eV) and low valence band maximum of CoO (−0.23 eV) formed interfacial electric field in CoO/Cu electrode to transfer electron from Cu to CoO, resulting in positively charged Cu (+0.01 eV) increase nitrate adsorption, whereas negatively charged CoO (−0.007 eV) decrease NO adsorption, improving removal and selectivity greatly for boosting ERNA. Eventually, CoO/Cu foam (Co/Cu ratio of 3.05) achieved the highest ammonia yield of 4.3 mg cm −2 h −1 with faradic efficiency of 96.7 %, surpassing Cu foam (1.2 mg cm −2 h −1 ) and CoO/Ni foam (1.3 mg cm −2 h −1 ) electrodes.
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FOOD CHEMISTRY
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2022
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IF 9.231
Gangfeng Li,Shaobiao Feng,Lili Yan,Lijuan Yang,Bei Huo,Liuliu Wang,Sheng Luo,Dexin Yang
Due to a small amount of Cu (Ⅱ) ions being beneficial and too much being harmful, it is necessary to establish a rapid and direct detection method. Herein, we reported a platform based on multiwalled carbon nanotubes (MWCNTs), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), and Nafion solution-modified glassy carbon electrode (GCE) for the direct electrochemical detection of Cu (II) ions. We used differential pulse anodic stripping voltammetry, including the electrodeposition of Cu (Ⅱ) ions on the modified GCE and subsequent anodic stripping. Under the optimum conditions, the linear range was 20 μg·L −1 ∼ 950 μg·L −1 , the limit of detection (LOD) was 16 μg·L −1 , and the limit of quantification (LOQ) was 54 μg·L −1 for Cu (II). We realized the quantitative detection of Cu (Ⅱ) ions in juice and tea beverage without tedious pretreatment. The result showed that the sensor had good anti-interference and practicability for actual food samples.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Junjie Li,Liming Liu,Syed Jalil Shah,Ying Tang,Shanliang Jiang,Guangyuan Mu,Quanru Man,Zhongxing Zhao,Zhenxia Zhao
Metal-organic frameworks (MOFs) modification and composite to chase high adsorption capacity and desorption efficiency for volatile organic compounds (VOCs) capture are a great challenge work. Seeking a suitable strategy to simultaneously promote the adsorption capacity and regeneration efficiency of MOFs is a significant practical challenge in this context. Herein, novel heat-conducting MOFs (HKUST-1) composite films were prepared for efficient and synchronous improvement of adsorption affinity and desorption efficiency. In our case, bulk Boron nitride (BN) was exfoliated into BN nano-sheets (BNNS), which were then spread as flakes on PVDF nanofibers to form a conductive network (BNNS/PVDF film, which was abbreviated as B/P film). With the aid of citric acid (CA) modification, HKUST-1 crystals were dispersed-grown on modified B/P (mB/P) film, resulting in the formation of a hierarchical pore structure in HK-mB/P film with a relatively high MOFs loading amount (45.8 wt%) and surface area (448 m 2 /g). Performance evaluation experiments showed that the toluene adsorption and desorption rates of the HK-mB 0.4 /P 0.6 film were 5.5 and 5.3 times higher than those of the powder HKUST-1, respectively. The fast adsorption rate could be ascribed to the constructed heat-conducting network and porous stacked nanofibers. Furthermore, its adsorption capacity for toluene was significantly increased up to 4.69 mmol/g at low pressure ( P / P 0 = 0.01), which was approximately-two times higher than that of pure HKUST-1. This merit was mainly attributed to the newly formed interface between HKUST-1 and mBNNS, which could strengthen the adsorption affinity for toluene by the generated unsaturated metal sites of (BNNS-CA-O|Cu|O-ligand) and π-π attraction of B-N bonds. Besides, the HK-mB 0.4 /P 0.6 film also displayed good cycling performance, with only a 3–4 % decrease in activity observed after five consecutive cycles.
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WATER RESEARCH
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2022
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IF 13.4
Fuwei Sun,Tianhu Chen,Ziyang Chu,Peixun Zhai,Haibo Liu,Qiang Wang,Xuehua Zou,Dong Chen
A system of Cu 2+ /calcite/PDS was constructed to degrade sulfadiazine (SDZ). Different from the traditional Cu-mediated activation, a low concentration of Cu 2+ that met drinking water standards (≤ 1 mg/L) transformed into Cu(Ⅱ) solid in the presence of calcite, and then enhanced the degradation of SDZ via PDS activation over a pH range from 3 to 9. According to scavenger and chemical probe experiments, Cu(Ⅲ), rather than radicals (hydroxyl radicals and sulfate radicals) and singlet oxygen, was the predominant reactive species, which was responsible for the degradation of SDZ. Based on the results of XRD, ATR-FTIR, and CV curves et al., CuCO 3 was the main complex with high reactivity for PDS activation to form Cu(Ⅲ). Moreover, detailed degradation pathways of sulfadiazine were proposed according to the UPLC-ESI-MS/MS and their toxicity was predicted by ECOSAR. Besides, the real water matrix would not seriously affect the degradation of SDZ in the Cu 2+ /calcite/PDS system. In summary, this study reveals a new insight into the synergistic effect of Cu 2+ and calcite on the SDZ degradation, and promotes an understanding of the environmental benefits of natural calcite.
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ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Miao Wang,Shuai Liu,Bo Chen,Fengyu Tian,Chuang Peng
Electrochemical CO2 reduction to formate provides a prospective avenue to produce more valuable products. Compared to pure Bi and Cu, the Bi–Cu (2:1) bimetallic catalyst optimizes the interfacial electronic structure through the electronic interaction between Bi and Cu. The Bi–Cu (2:1) catalyst exhibits a high faradaic efficiency of 94.1% at −1.0 V vs RHE, high faradaic efficiency (>90%) toward formate in a wide potential window (500 mV), and long-term stability of 20 h. The electrocatalytic mechanism is identified by combining in situ FT-IR and DFT calculations, which demonstrates that formate prefers to be formed through the HCOO* pathway. High faradaic efficiency in a wide potential window can be ascribed to stable active sites and the decreased energy barrier in HCOO* and formate. This study further provides inspirations for promoting the electrocatalytic selectivity of bimetallic catalysts through effective interfacial electronic modulation.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Xiuxuan Fang,Yingzhi Zhu,Haotian Dong,Na Ma,Wei Dai
In view of unstable Cu-BTC could be destroyed by water molecules, causing a significantly performance decrease of adsorptive desulfurization, a (MOF-818)-on-(Cu-BTC) composite was innovatively designed and synthesized to achieve win-win for enhancing abilities of water-stability and desulfurization in this work. We approved that the novel (MOF-818)-on-(Cu-BTC) desulfurizer was achieved through nitrogen adsorption-desorption, powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS), etc. Thiophene (Th), benzothiophene (BT), and dibenzothiophene (DBT) capture performances from different simulated fuels in presence of moisture were systematic evaluated by means of batch tests. Further investigations demonstrated that the (MOF-818)-on-(Cu-BTC) exhibited remarkably sulfur capture ability, attributing to associative effects of specific surface area, nanopores , and acid-base interaction. Importantly, this (MOF-818)-on-(Cu-BTC) impressively retained sulfur capacity and its structural integrity even soaked in water for 7 days. Water-resistant ability was accordance with the order: (MOF-818)-on-(Cu-BTC)＞MOF-818＞Cu-BTC. This novel work would provide a new idea for adsorptive desulfurization by MOF-on-MOF in the presence of water environment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Liuting Mo,Shifeng Zhang,Fei Qi,Anmin Huang
Water pollution by heavy metal ions is a global concern due to detrimental effects on the ecological environment and human health. To solve the problem of the stability and recyclability of the traditional adsorbents, we proposed three-dimensional lamellar porous cellulose nanofiber/polyacrylamide composite aerogel with outstanding pollutants adsorption, easy regeneration, and multiple recycling. The aerogel adsorbent was prepared by a two-step method via facile in-situ physical/chemical double cross-linking and freeze-drying processes. The resulting aerogels showed good thermal stability , superior water stability and excellent adsorption properties, with a maximum Langmuir adsorption capacity for Cu(II) ions up to 240 mg g −1 due to the in-situ physical/chemical combination of anionic polyacrylamide and carbonylated cellulose nanofibers. The adsorption mechanism was the electrostatic attraction, chelating effect and complex formation driving forces for the fast and efficient adsorption of Cu(II) ions. The removal efficiency of the aerogels for Cu(II) remained above 80% after 10 adsorption/regeneration cycles, suggesting its outstanding recyclability. The proposed aerogel adsorbent shows noteworthy potential for the practical treatment of heavy metal ion wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Hui Zhao,Yinsen Huang,Yichen Han,Jin Yun,Xinlong Wang,Liang Jin,Yaping Zheng,Lixin Chen
Lightweight porous conductive polymer composite materials (CPCs) are up-and-coming electromagnetic interference (EMI) shielding materials. However, fair-sized thickness (>1 mm) and limited thermal conductivity hinder their application in modern integrated and miniaturized electronics. Herein, flexible bidirectional differential porous carbon fillers (C-fillers)/polyether sulfone (PES)/Cu (PCPES/Cu) composite films are fabricated via phase inversion technology followed by magnetron sputtering process. The bidirectional differential structure features with a top porous C-fillers/PES (PCPES) film and a bottom sputtering highly-conductive Cu thin layer. The PCPES film possesses hierarchical pore structure that is derived from mass transfer between solvent and nonsolvent. Owing to the bidirectional differential structure, an “absorption-reflection-reabsorption” shielding process is created to strengthen EMI shielding performance and relieve secondary microwave reflection in PCPES/Cu composite film. Its shielding effectiveness is as high as 59.7 dB, and specific SE/t is up to 6982.5 dB cm 2 g −1 . Notably, the reflection coefficient falls to 0.73, below other shielding materials with similar thickness. Further, the Cu thin layer can construct effective transmission channel of phonons in the plane direction, allowing thermal conductivity enhancement. The flexible lightweight EMI shielding composite films with satisfied thermal conductivity have extensive application prospects, such as aerospace, wearable electronics, and portable electronics.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Xiuqin Dong,Jianhang Tian,Junwei Lei,Yifei Chen
Copper as a non-noble metal catalyst has great prospects in the hydrogenation of acetic acid to ethanol. In this paper, Cu-MnO/SBA-15 catalysts with highly catalytic performance and stability were prepared. The mechanism was elucidated by experiments and DFT calculations . The Cu and MnO were coexistent on reduced x Cu y Mn/SBA-15. Appropriate Cu/Mn ratio was beneficial for increasing the Cu surface area and reducing the size of Cu. The rate-controlled step was found and the MnO could effectively lower the difficulty of acetaldehyde formation by dioxyethylidene. DFT calculations indicated that the formation of ethyl acetate at the Cu-MnO interface was largely prevented. The optimal catalytic hydrogenation activity was obtained for 9Cu1Mn/SBA-15, with the conversion of acetic acid and selectivity of ethanol of 99.9% and 90.1%, respectively. The catalytic activity could remain within 72 h which was more stable than the original Cu-based catalyst.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Mancai Qian,Man Guo,Yuan Qu,Meijiao Xu,Datai Liu,Cheng Hou,Tayirjan Taylor Isimjan,Xiulin Yang
Reducing the oxygen adsorption energy barrier is vital to accelerate the oxygen reduction reaction (ORR). Herein, we report a mesoporous cake-like structured Zn-N/Cu-N electrocatalyst (ZnCu-N-C) with robust electrocatalytic performance and exceptional durability in 0.1 M KOH solution. The mesoporous cake-like structure is promising to expose more active sites. Extended X-ray absorption fine spectroscopy and X-ray photoelectron spectroscopy confirmed the existence of M-N x (M = Zn, Cu). More importantly, the density functional theory (DFT) calculations corroborate that the Zn-N/Cu-N dual active center can reduce the oxygen adsorption energy barrier. Therefore, the optimized ZnCu-N-C electrocatalyst is ahead of commercial Pt/C (20 wt%) in all aspects. Moreover, the ZnCu-N-C-based Zn–air batteries exhibit outstanding long-term stability of 240 cycles, a large power density of 156.2 mW cm −2 , and a high specific capacity of 732.7 mA h g −1 . This work may provide new guidance for the rational design of cathode catalysts in Zn-air batteries.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Yuqing Pan,Na Li,Shiyuan Ran,Du Wen,Qinlan Luo,Ke Li,Qulan Zhou
Efforts have been devoted to exploring the effective composite catalysts for low-temperature selective catalytic reduction of NOx by CO (CO-SCR) using Fe-Cu bimetal oxide (Fe2Cu1) as the active component and rice husk ash (RHA), amorphous SiO2, and activated carbon (AC) as supports. The results showed that the beneficial role of RHA as a catalyst support for CO-SCR was primarily reliant on amorphous SiO2 in RHA and not on AC. Both Fe2Cu1/RHA and Fe2Cu1/amorphous SiO2 catalysts exhibited the best catalytic performance of CO-SCR, which had good stability, wide active temperature range, high conversion ratio, 100% N2 selectivity, and superior resistance to O2, SO2, and H2O (g). The CO and NOx conversion ratios of Fe2Cu1/amorphous SiO2 could reach up to approximately 100% from 100 to 500 °C. The excellent SCR performance was associated with the large specific surface area and good structural stability of amorphous SiO2, the uniform distribution of active sites, dual redox cycle of Fe2O3 and CuO species, and many surface-adsorbed oxygen species, which made amorphous SiO2-based catalysts highly competitive for application in the SCR process. This research provides the underlying insights for the improvement of industrial application to realize ″non-ammonia SCR″ technology with near-zero NOx/CO emissions synergistically at low temperatures.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Ruolan Zhou,Xiaohong Zhuang,Qiaoli Wu,Ming Jin,Chaochuan Zheng,Yayun Jiang,Yongliang Lou,Laibao Zheng
As an alternative to natural enzymes , artificial enzymes based on nanomaterials have attracted a lot of attention owing to their outstanding catalytic activity and high stability as well as low cost. Cu-MOF loaded with platinum nanoparticles (labeled Cu-MOF@Pt) was prepared by simple one-step wrapping method using platinum nanoparticles, copper nitrate trihydrate and 1,3,5-tricarboxybenzene. It was confirmed that Cu-MOF@Pt exhibits peroxidase-like activity, which can quickly catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) and produce blue oxidized TMB (oxTMB) in the presence of hydrogen peroxide (H 2 O 2 ). Additionally, steady-state kinetics showed that Cu-MOF@Pt exhibits stronger appetency to TMB and H 2 O 2 compared with horseradish peroxidase . Thanks to the peroxidase-like activity of Cu-MOF@Pt, a highly selective colorimetric method for glucose detection has been successfully established, the linear range is 2–15 mM (R 2 =0.9999) and the Limit of Detection (LOD) is 0.42 mM, with a detection range that meets clinical needs. Moreover, its good intra- and inter-assay precision and excellent stability make the results of glucose detection very reproducible. The detection performance of 90.09% was still maintained at 4 ℃ for 2 months. In conclusion, a new nanocomposite was successfully prepared and its selective detection ability for glucose was proved, which established a good basis for the clinical development of new enzymes for biosensors .
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