MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Liyin Bu,Xiaohui Chen,Qingyuan Song,Ding Jiang,Xueling Shan,Wenchang Wang,Zhidong Chen
In this study, a supersensitive electrochemical impedance spectroscopy (EIS) analysis method combined the molecularly imprinted polypyrrole (MIP) which electropolymerized on the composites of zirconium-based metal organic framework (Uio-66) and carbon dots (CDs) modified glassy carbon electrode (GCE) was developed for chloramphenicol (CAP) determination. The integration of Uio-66 and CDs effectively promoted the sensitivity of the proposed MIP senor by improving the surface area and the charge transfer of electrode. By extraction of CAP template, the specific sites were formed on the MIP surface which can rewrap the CAP target molecules. The CAP determination was based on the charge transfer difference (△Rct) before and after the MIP/ [email protected] /GCE rebinding the CAP. The results showed that △Rct responded good linearity to the logarithm of CAP concetration in the range of 0.1 – 100 pmol/L, with a low detection limit of 0.061 pmol/L (S/N = 3), exhibiting high sensitivity and specificity for the determination of CAP.
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高影响因子
Science China-Materials
·
2022
·Vol. 65
·期 9
·2479-2490
·
IF 8.64
Sun Shuangjie,Tian Qingli,Mi Hao-Yang,Li Jun,Jing Xin,Guo Zhanhu,Liu Chuntai,Shen Changyu
Solar-driven steam generation is a practical strategy to harness solar energy for desalination and production of clean water with a minimized carbon footprint. However, this strategy suffers from a low evaporation rate under weak illumination on cloudy days or at night. Herein, we present a fabric-based all-weather-available photo-electrothermal steam generator (P/ET-SG) capable of regulating the surface temperature and evaporation rate by the coupling effect of photo-thermal and electro-thermal heating depending on the light conditions. An unprecedented high surface temperature of 52°C in the wet state and an evaporation rate of 2.61 kg m −2 h −1 were achieved by the P/ET-SG under 1 sun with only 1 V input voltage owing to the uniform heat distribution and the coupled electro-thermal source. The oneway fluidic design of the P/ET-SG effectively prevented salt precipitation during continuous desalination in 24 h and was able to remove salt granules from the evaporation surface. Furthermore, the P/ET-SG demonstrated a high evaporation rate of 2.58 kg m −2 h −1 in the purification of concentrated saline water and dye-contaminated water with high efficiency (>99.9%). This study offers new thoughts for the design of all-weather-available solar steam generators with high efficiency and makes a step forward towards fast purification of concentrated saline water and wastewater.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Jingsheng Zhou,Beibei An,Zhiyong Zhu,Li Wang,Jinglai Zhang
Doping heteroatoms in carbon materials is a promising method to prepare the robust electrocatalysts for the carbon dioxide reduction reaction (CO2RR), which is beneficial for sustainable energy storage and environmental remediation. However, the obscure recognition of active sites is the obstacle for further development of high-efficiency electrocatalysts, especially for the N,P-codoped carbon materials. Herein, a series of N,P-codoped carbon materials (CNP) is prepared with different N and P contents to explore the relationship between the N/P configuration and the CO2RR activity. As compared with the N-doped carbon materials, the additional P doping is helpful to improve the activity. The optimum N,P-codoped carbon materials (CNP-900) achieve 80.8% CO Faradaic efficiency (FECO) at a mild overpotential of 0.44 V. On the basis of the X-ray photoelectron spectroscopy results, the suitable ratio between pyridinic N and graphitic N and the least P–N content are beneficial for CO2RR. The density functional theory calculations further illustrate that two elementary steps to form *COOH and *CO in CO2RR are determined by the graphitic N and pyridinic N configurations, respectively. The existence of the P–N configuration breaks the equilibrium between graphitic N and pyridinic N to suppress the activity.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chunyue Zhou,Xuzhong Gong,Yueke Feng,Jijun Lu,Yulong Fu,Zhi Wang,Junhao Liu
Low coulombic efficiency and poor cyclic stability are two common problems for silicon anodes. Therefore, it is of great significance to improve cycling performance and initial coulombic efficiency (ICE) via rational surface engineering on nano-Si anodes. Herein, a new nano-silicon anode is obtained by straightforward constructing a multifunctional polypyrrole protective layer on the surface of silicon nanoparticles , which is further used as the inner boundary of solid electrolyte interface (SEI) film. Specifically, the Li salt decomposition reaction between the electrolyte and silicon surface is effectively inhibited under the protection of the compact artificial boundary. The transfer of Li + for forming the SEI film is selectively slower than that of lithiation/delithiation reaction. This further reduces the amount of SEI film, leading to a high ICE of 93.2% at 0.5 A g −1 for modified nano-Si anodes. In addition, the flexible SEI precursor combined with the high proportion of organic components in SEIs not only accommodates the volume change of nano-silicon, but also suppresses accumulation of “waste SEI”, so the electrode can maintain a reversible capacity of 1153.2 mAh g −1 at 1 A g −1 after 500 cycles. This work provides important guidance for surface structural optimization of alloy-type anodes with high volume change.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lantao Liu,Yaping Lu,Shuaize Wang,Yinghui Ding,Yaxin Chen,Daping Qiu,Dengke Wang,Jin Niu,Jiapeng Zhang,Xiaohong Chen,Huaihe Song
Heteroatom-rich carbon materials deliver superior potassium storage capacity owing to the abundant active sites, but their stability and conductivity are damaged because of the numerous defects and distortion of π-conjugated system. In this work, we amended the adverse influences of heteroatoms on carbon materials through the B, N stabilization effect. Due to an amending effect of B atoms on the N -doped carbon matrix, the integrity of the carbon skeleton and stability of the system are significantly enhanced, and the undesirable defects are transformed into favorable active sites, resulting in the simultaneous improvement of K + storage capacity, rate performance and cyclic stability. The stabilized materials have a highly reversible carbon structure and fast K + transfer kinetics, leading to high reversible capacity (300 mA h g −1 at 0.1 A g −1 ), good rate performance (107.2 mA h g −1 at 10 A g −1 ) and superior cyclic stability (75.3 % capacity retention from cycle 11 to 2000 at 1 A g −1 ). Consequently, the constructed devices perform excellent energy densities of 158.8 and 40.7 Wh kg −1 under power densities of 100 and 11250 W kg −1 , respectively. This work proposes an effective strategy for significantly improving heteroatom-rich carbon materials, which broadens its application fields in high-performance potassium ion storage.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mengtong Xia,Yu Yan,Haiyan Pu,Xuening Du,Jingyi Liang,Yaning Sun,Jiani Zheng,Yue Yuan
In photodynamic therapy (PDT), the concentration of reactive oxygen species (ROS) generated in cells directly determines the therapeutic effect. However, excessive glutathione (GSH) concentration at the tumor site and hypoxic environment strongly reduce the production of ROS. Nitric oxide (NO) has a variety of anti-tumor activities, including the induction of cell apoptosis and sensitization to PDT, so it is in the spotlight in the area of cancer intervention. Therefore, it is very innovative to combine NO therapy with PDT and simultaneously reduce GSH content and relieve hypoxia. Metal-organic framework (MOF) is an emerging drug delivery vehicle that can exert photodynamic effects when a photosensitizer is used as its organic ligand. In this study, we constructed a GSH-responsive NO producing nanosystem to enhance ROS production through GSH depletion and hypoxia alleviation. Briefly, nicorandil (Nic) is encapsulated into porous porphyrinic MOF nanoparticles, and hyaluronic acid (HA) is electrostatically adsorbed on the surface of the MOF nanoparticles for CD44 receptor-targeting and prevention of Nic leakage. Notably, the Nic reacts with GSH to produce NO gas with vasodilation and GSH reduction, thus improving oxygen supply for efficient ROS generation. Moreover, the generated NO can further react with superoxide radical anion to produce highly reactive peroxynitrite (ONOO − ) molecules with higher cytotoxicity. Overall, the [email protected] nanosystem combines NO gas therapy with PDT, resulting in a significant increase in ROS production and greatly enhancing the efficacy of PDT.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yujuan Cao,Ning Wu,Fan Yang,Meng Yang,Tingting Zhang,Hao Guo,Wu Yang
Due to the insufficient performance, it is still a challenge to combine conventionally synthesized metal-organic framework (MOF-74) with other materials to fabricate composite electrodes for high-performance supercapacitors . Herein, we synthesized a series of NiCo-MOF-74 composite materials with different amounts of polypyrrole nanotubes (T-PPy) denoted as NiCo-MOF-74/T-PPy-m (m = 2.5, 5, 10, 15 and 20) through in situ growth of the bimetallic MOF around the PPy nanotubes by a simple solvothermal method . By comparison, the NiCo-MOF-74(1)/T-PPy-10 composite, with a Ni/Co molar ratio of 1:1 obtained in the presence of 10 mg of T-PPy, possessed the highest specific capacitance of 849 C·g −1 at 1 A·g −1 and excellent cyclic stability with a capacitance retention rate of 90.0% after 10,000 cycles as well as good rate performance. Moreover, the assembled asymmetric supercapacitor respectively using NiCo-MOF-74(1)/T-PPy-10 and active carbon as positive electrode and negative electrode achieved a superior energy density of 58.4 Wh kg −1 at the power density of 747.6 W kg −1 and high cyclic lifespan (91.4% capacitance retention after 10,000 cycles). The mechanism of capacitance increase was studied in detail, influences of metal molar ratios, morphology and addition amounts of PPy on electrochemical performances of the formed composition materials were systematically discussed, and it was found that the interpenetrating network structure assembled by “string of candied haws”-like T-PPy-interweaved NiCo-MOF-74(1) polyhedrons possessed the best capacitive performance for enhanced conductivity of the resulted composite, improved dispersity of the bimetallic MOF and more exposed active sites. And the interwoven structure alleviated the stress change-induced structure or phase variation caused by repeated volumetric swelling and shrinking during charge/discharge cycle and enhanced the rate capability and cycling stability.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 15
·9424-9434
·
IF 4.036
Yan Wang,Rongyao Chen,Zijing Dai,Qingcai Yu,Yongmei Miao,Ronghua Xu
In this study, Chinese yam peel (CYP) was modified with polypyrrole via an in situ polymerization method to remove Congo red from aqueous media. The prepared CYP–polypyrrole (CYP–PPy) composite was characterized using FTIR, SEM, TEM, XRD, TG and BET analysis. The performance of CYP–PPy towards the adsorption of Congo red (CR) was explored in batch mode. The removal efficiency of CR was found to be 86% at the initial concentration of 100 mg L−1, contact time of 120 min, and the adsorbent dosage of 10 g L−1. At equilibrium time (20 h), the removal efficiency was significantly acceptable (98.9%). The adsorption kinetics data were most consistent with the pseudo-second-order kinetic model. The adsorption equilibrium data could be described well by the Langmuir isotherm model with the maximum adsorption capacity of 86.66 mg g−1. In view of thermodynamics, the adsorption process was endothermic and more favorable for CR removal at 45 °C. A reusability study indicated that CYP–PPy could be reused effectively for up to three successive cycles of ad-/de-sorption. Hence, this work provides an alternative scheme for the targeted exploitation of agricultural waste to control dye pollution.
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高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Ping Zhang,Meihua Xie,Yangbing Jin,Chunde Jin,Zhe Wang
Bamboo can be used as a good substrate material for an evaporation device because of its rich resources, low thermal conductivity, porous structure of microchannels, and high hydrophilicity. We use a simple surface self-assembly technique to load polypyrrole (PPy) onto bamboo to make solar evaporation devices. All the advantages of the PPy-bamboo solar evaporation device make it achieve 88% solar light absorption in the UV–vis–NIR region. The PPy-bamboo solar evaporation device can get a high photothermal conversion efficiency of 76.87% in the light intensity of one sun. Furthermore, the ion concentrations in the distilled water that evaporated by the PPy-bamboo solar evaporation device satisfy the drinking water standard of World Health Organization (WHO). The results of seawater desalination test and sewage treatment experiment show that the PPy-bamboo solar evaporation device has good desalination capacity and sewage treatment ability. Therefore, the PPy-bamboo solar evaporation device has a good prospect to supply a major direction to solve the difficulties with inadequate freshwater supply and treating sewage.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 4
·941-948
·
IF 2.726
Shen Congcong,Chen Yuehua,Feng Beidou,Chi Hongying,Zhang Hua
An ultrasensitive electrochemical biosensor was fabricated for electroanalytical determination of ascorbic acid(AA), dopamine(DA) and uric acid(UA) individually and simultaneously based on polypyrrole hollow nanotubes loaded with Au and Fe 3 O 4 nanoparticles(NPs) uniformly(PPy@Au-Fe 3 O 4 ). The PPy@Au-Fe 3 O 4 nanotubes were synthesized in one-pot using MoO 3 nanorods as templates and the polymerization of Py, the formation of Au and Fe 3 O 4 NPs and the removel of MoO 3 templates took place stimultaneously. Electrochemical studies reveal that PPy@Au-Fe 3 O 4 modified glassy carbon electrode(GCE) possesses excellent electrocatalytic activities toward the oxidation of AA, DA and UA. Their oxidation peak currents increase linearly in the concentration ranges of 1–2000 µmol/L for AA, 0.01–25 and 25–300 µmol/L for DA and 0.1–300 µmol/L for UA. Their detection limit values( S/N =3) were calculated as 0.45, 0.0049, and 0.051 µmol/L for AA, DA and UA in the individual detection. By changing the concentrations simultaneously, the calibration curves showed linearity to 1000, 200, and 200 µmol/L with detection limit of 0.39, 0.0060, and 0.060 µmol/L for AA, DA, and UA, respectively. Finally, the obtained biosensor was successfully applied to the detection of AA, DA, and UA with satisfactory results on actual samples.
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高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Han Qiang,Wen He,Feiyu Guo,Jizhou Cao,Rui Wang,Zhihao Guo
In this study, self-supporting flexible supercapacitor electrodes were prepared by wrapping polypyrrole (PPy) on the surface of the TEMPO-oxidized cellulose nanofiber (TOCN)/reduced graphene oxide (RGO) film using a layer-by-layer self-assembly method under an oil–water separation environment. The obtained film had a three-dimensional-layered structure and exhibited a certain porosity, which is favored for the electrochemical performance. The areal capacitance of the TOCN/RGO/PPy film electrode was as high as 915 mF cm–2, and 96.6% capacitance was retained after 2000 cycles of charge and discharge. Also, it maintained a higher rate retention of 98.4% after undergoing bending 200 times. These capacitance values are significantly better than RGO or PPy single-component films or their mixture with similar constituents. Furthermore, a solid-state symmetric supercapacitor was assembled by combining the TOCN/RGO/PPy electrode and CNF hydrogel films as a separator, which displayed an excellent specific capacitance of 195.8 F g–1 and a volumetric capacitance of 9.8 F cm–3 at the current density of 0.1 mA cm–2. Meanwhile, an outstanding energy density of 13.04 Wh kg–1 with a power density of 200.6 W kg–1 was also obtained. These facts fully suggest that the TOCN/RGO/PPy film with a three-dimensional-layered structure in this study is promising for high-performance flexible energy-storage electrodes.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Decheng Zhang,Xiudan Lang,Ni Hui,Jiasheng Wang
The inappropriate and excessive use of pesticides poses a great challenge to human health. It is necessary to analyze pesticide residues efficiently, economically and quickly to minimize the risk of public safety issues. Herein, a dual-mode biosensor was proposed for ultrafast and ultratrace detection of acetamiprid (ACE). The polypyrrole nanowires (PPyNWs) was prepared using the guidance of CS by electrochemical method, which showed large electroactive surface area, excellent conductivity and high stability. After immobilization of ACE aptamer onto CS/PPyNWs, the biosensor can be effortlessly prepared. The ACE concentration can be measured by both the signal decrease of the chronocoulometry (CC) method and the chronoamperometry (CA) method. The dual-mode biosensor exhibited ultrafast detection speeds of 0.5 s and 2 s across 9 and 6 orders of magnitude linear ranges through CC and CA, respectively. More importantly, the biosensor was successfully applied to detect ACE residues in soil samples, proving the feasibility of the dual-mode biosensor for ACE detection in complex samples.
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高影响因子
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