CHEMOSPHERE
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2022
·
IF 8.943
Dongxu Gu,Yu Liu,Hongyu Zhu,Ying Gan,Biao Zhang,Weiting Yang,Jianyuan Hao
Nanomaterials with visible light-driven catalytic ability are beneficial in controlling environmental pollutants. Porphyrin-based metal organic gel (MOG) was herein synthesized in one step and magnetic metal organic gel (MMOG) was successfully prepared via in-situ reaction of MOG and Fe 3 O 4 . This MMOG was developed as a novel visible light assisted Fenton-like catalyst. The catalytic experiments showed the high photo-Fenton activity of MMOG in the degradation of Rhodamine B (RhB) in the presence of visible light and H 2 O 2 with a RhB degradation efficiency of 94.2% within 40 min. Notably, the obtained MMOG can kill E. coli and S. aureus with high killing rate (>99.999%) under visible light. Importantly, the MMOG can be recovered simply by an external magnetic field due to the unique magnetic property. This easily synthesized MMOG with photo-Fenton activity under visible light and magnetic property makes MOG based on the photo-Fenton reaction a prospective material for the environmental and biomedical applications.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 22
·10271-10284
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IF 4.682
Zhang Xueyu,Ding Mengru,Liu Shousheng,Guo Fengxiang,Zhang Mei,Zhang Lili,Gai Zhigang,Wang Yinglong
The increasing demand for higher-energy-density supercapacitors driven by advancements in devices necessitates the development of alternative electrolytes with a higher specific capacity or larger voltage window. Compared with the fruitful results achieved by expanding the voltage window, there is less report on the method of using electrolytes to directly improve the capacitance performance of electrode materials, thereby increasing the energy density of the device. Herein, a new strategy has been developed to prepare electrolytes by mixing partially reduced graphene oxide (PrGO) and polypyrrole into the salt solution (NaClO 4 ), where the PrGO is controlled at the critical state of solid precipitation by adjusting the degree of reduction. Furthermore, density functional theory calculations are also carried out to study the relationship between the band gap of PrGO and the degree of reduction. Since the PrGO-based conductive active group is dissolved in the electrolyte, the electrolyte has the potential to increase the effective area of the solid electrode during the charging and discharging process, thus increasing the capacitance of the device. The specific area capacitance of commercial carbon cloth electrodes in this electrolyte is much higher than that in traditional salt solution electrolyte (1525 vs. 90 mF cm −2 ). In particular, the cycle performance of the device has also been greatly improved. After 10000 charge–discharge cycles, the device has reached 110.64% of the initial capacitance. Since this electrolyte has no special requirements for electrode materials, this novel electrolyte preparation strategy has broad application prospects in energy storage devices based on supercapacitor. Graphical abstract
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ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Ye Wang,Zhiguo Nie,Xinyi Li,Rui Wang,Yang Zhao,Huan Wang
Driven by the urgent requirement to monitor the trace amount of heavy metal ions, a novel electrochemical sensing platform is constructed by surface modification of magnetic NiFe2O4 nanoparticles with polypyrrole (PPy). This NiFe2O4/PPy nanocomposite has a unique three-dimensional network architecture. Under the optimized experimental conditions, the fabricated sensor exhibits enhanced sensing performance for selective recognition of trace Pb2+ in the range of 0.1–2.1 μM by square wave anodic stripping voltammetry. The sensitivity of a NiFe2O4/PPy-decorated glassy carbon electrode (GCE) toward Pb2+ is verified to be superior to that of both bare GCE and NiFe2O4-decorated GCE, and an extremely low detection limit of 3.9 nM (S/N = 3) can be achieved. The accurate detection of Pb2+ is also challenged by various aqueous media and satisfactory recoveries varied from 98–107%, endowing it with great prospects in the analysis of real water samples. Moreover, the interferences from coexisting ions such as Cd2+, Fe3+, Zn2+, Ni2+, Cu2+, and Na+ can be ignored to some extent. The present study not only provides a new candidate for the efficient detection of Pb2+ but also sheds light on exploring advanced electrode materials to rationally design sensing interfaces.
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FOOD CHEMISTRY
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2022
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IF 9.231
Fangyuan Hou,Qingyun Chang,Nana Wan,Jie Li,Xiaohuan Zang,Shuaihua Zhang,Chun Wang,Zhi Wang
A novel porphyrin-based conjugated microporous polymer (PCMP) with microporous structure and nitrogen-rich pyrrole building blocks was synthesized. The PCMP was used as a coating material to prepare solid-phase microextraction (SPME) fibers by sol–gel technique. Due to the toxicity of the phthalate esters (PAEs) and the necessity for their sensitive determinations in some food samples, the SPME fiber was investigated for the extraction of eleven PAEs from six different children's milk beverages prior to their detection by gas chromatography-mass spectrometry. Under the optimal conditions, the linear response range for the PAEs was in the range from 0.03 to 200 µg L −1 and the limits of detection (S/N = 3) for the analytes were 0.01–3.00 μg L −1 . The method recoveries for the PAEs were between 80% and 120%, with the relative standard deviations varying from 1.3% to 9.8%. The method was successfully applied for the determination of PAEs in children's milk beverages.
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ACS Applied Energy Materials
·
2022
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IF 6.959
Zihan Chen,Xihong Zu,Liheng Chen,Yi Qi,Wenbin Jian,Yaoying Wu,Wenli Zhang,Xuliang Lin,Guobin Yi,Quanbing Liu,Zilun Tang,Jianyu Wu,Huafeng Dong,Yanlin Qin
The development of high-performance flexible supercapacitors is desperately desired for application in wearable electronics, but the fabrication of a flexible self-supporting 3D electrode with light weight and high energy density remains challenging. Herein, we report an approach to fabricate the flexible self-supporting and lightweight 3D G-PPy@Fe-MnCo2O4 hierarchical electrode for flexible solid-state supercapacitors (FSSCs), which utilizes the active material 3D G-PPy as a substrate to vertically grow Fe-MnCo2O4 nanowire (NW) arrays. Importantly, the experimental results and DFT simulations indicate that Fe-MnCo2O4 NWs obtain metallic characteristics by doping Fe into a MnCo2O4 lattice, which induces the free propagation of electrons in the electrode. Thus, MnCo2O4 utilization efficiency and cycle performance are both greatly enhanced. The electrode has a high areal specific capacitance of 5136 mF cm–2 (422.4 F g–1) at 2 mA cm–2 with long-term cycle stability. The capacitance retention is about 94.7% after 7000 cycles. It presents a viable design route toward advanced wearable energy storage devices.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jie Huang,Zhirong Liu,Dejuan Huang,Tianxiang Jin,Yong Qian
In order to efficiently extract uranium from uranium-containing wastewater, a novel acid doped polypyrrole/carbon felt (PA-PPy/CF) electrode was prepared via a facile electrodeposition method. For this material, PA and PPy combined to form a stable chemical structure by a charge compensation mechanism. The electrochemical characterization results showed that PA-PPy can significantly accelerate the electrochemical reduction rate of uranium ions. Moreover, a double potential step technique (DPST) was applied to prevent water splitting and maintained the electrocatalytic reduction activity of the surface groups during the electrochemical adsorption process . The removal efficiency obtained by the DPST method was six times higher than that obtained by the conventional chemical adsorption . When the concentrations of uranyl nitrate were 10, 20, 50, and 100 mg/L, the removal efficiencies of uranium were 98.8%, 98.1%, 94.6%, and 93.7%, and the adsorption capacities of uranium were 164.7, 326.9, 788.5, and 1562.0 mg/g, respectively. This material also showed an excellent recycling performance and remarkable selectivity for uranium ions. This work may shed light on the development of removal system for uranium (VI).
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RSC Advances
·
2022
·Vol. 12
·期 15
·9424-9434
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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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ACS Applied Polymer Materials
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2022
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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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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Shengqu Liu,Yuehui Zhong,Xiaoling Zhang,Menghan Pi,Xiaoyu Wang,Ruijie Zhu,Wei Cui,Rong Ran
Developing flexible energy storage devices with the ability to retain capacitance under extreme deformation is promising but remains challenging. Here, we report the development of a durable supercapacitor with remarkable capacitance retention under mechanical deformation by utilizing a physical double-network (DN) hydrogel as an electrolyte. The first network is hydrophobically associating polyacrylamide cross-linked by nanoparticles, and the second network is Zn2+ cross-linked alginate. Through soaking such a DN hydrogel into a high concentration of ZnSO4 solution, a highly deformable electrolyte with good conductivity is fabricated, which also shows adhesion to diverse surfaces. Directly attaching the hydrogel electrolyte to two pieces of an active carbon cloth facilely produces a flexible supercapacitor with a high specific capacitance and theoretical energy density. Remarkable capacitance retention under tension, compression, and bending is observed for the supercapacitor, which can also maintain above 87% of the initial capacitance after 4000 charge–discharge cycles. This study provides a simple way to fabricate hydrogel electrolytes for deformable yet durable supercapacitors, which is expected to inspire the development of next-generation flexible energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jiaming Xiong,Minghui Ye,Zhijian Wang,Jiajun Chen,Yufei Zhang,Yongchao Tang,Cheng Chao Li
The uneven distribution and slow diffusion kinetics of potassium ions (K + ) result in the formation and growth of K dendrites as well as poor rate capabilities, restricting the development of K metal anodes (KMAs). Paired with a Mn-based Prussian blue (PB) cathode, the KMA-based full battery exhibits a low average discharging voltage of ≈3.6 V and a high overpotential. Herein, a N-doped graphene nanomesh (NGM) acts as a conductive and potassiophilic host to solve this issue. First, the NGM enables K + ions to rapidly transport its nanopores and edges to reach the whole electrode, offering unblocked transport channels for K + ions and thus acquiring an enhanced rate capability. Second, the N atoms and defects within NGM reduce the nuclear energy barrier of K + ions and induce their homogeneous deposition, avoiding the formation of K dendrites. Third, the nano-/micro-pores within NGM can accommodate the volume exchange of KMA during cycles, improving its cycling stability. Benefiting from these merits, the symmetric K@NGM cell delivers an ultra-low overpotential of 12.4 mV after 1700 h. Matched with a K 1.7 Mn[Fe(CN) 6 ] 0.9 /graphene cathode, a 4 V and dendrite-free KMnHCF/G‖K@NGM full cell is designed, which exhibits excellent cycling stabilities and rate capabilities.
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Plants-Basel
·
2022
·Vol. 11
·期 6
·823
·
IF 4.658
Sifan Mei,Yanyan Cao,Gang Zhang,Su Zhou,Yi Wang,Shuying Gong,Qiang Chu,Ping Chen
Baking is widely accepted for aroma enhancement of black tea, and studies have mainly focused on the aroma or chemical substances under a specified baking condition. Understanding of the feedback between aroma substances and characteristics is urgently needed. Therefore, a mutual feedback platform (SES/MS) combined sensory evaluation system (SES) with gas chromatography–mass spectrometry (GC-MS) was established. Based on this platform, we found that baking at 90 °C for 4 h or 5 h could maintain the primary aroma attributes and increase characteristic aroma attributes—these were considered to be the best baking conditions for Yunnan congou black tea. Meanwhile, 47 volatiles were identified, among which, pyrrole and benzaldehyde appeared to have a caramel aroma, and 2-furanmethanol and α-terpineol presented a baked aroma. This study reveals the dynamic change of aroma profiles and compounds during the aroma enhancement, and provides an optional template for researchers, focused on the relationship between quality and aroma attributes of teas.Keywords:Yunnan congou black tea;aroma enhancement;aroma attributes;volatile compounds;multiple factor analysis
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Xia Wang,Yunzhen Chang,Hua Song,Wenjing Hou,Ying Zhang,Yanping Li,Gaoyi Han,Yaoming Xiao
As one kind of promising energy storage device, zinc-ion batteries have attracted much attention due to their large energy density, environmental friendliness and simple operation. However, the energy density of this kind of device is limited by the capacity of cathode. Conducting polymer such as polypyrrole (PPy) can be used as the cathode material but its capacity is determined by the redox sites of the molecular chains. Here, we use triodide anions to codope PPy to increase its capacity because the oxidized state of PPy and the formed triiodide anions will be discharged together. It is found that the doping of iodide ion can enable Zn//PPy-I battery to obtain a capacity of 145 mAh g −1 based on the PPy, which is increased by 47.0 % compared with pure PPy. Due to the strong electrostatic attraction, the triiodide anion can be fixed into the polymer matrix to avoid the self-discharge caused by triiodide ion shuttle without using expensive ion exchange membrane. Furthermore, the devices exhibit good rate capability and cyclic stability (78.5% of capacity retention after 1000 cycles). This strategy provides a new method to improve the energy density of PPy by introducing additional active doping anions.
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