Nanomaterials
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2020
·Vol. 10
·期 4
·686
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IF 4.324
Linlin Du,Peng Gao,Yuanli Liu,Tsuyoshi Minami,Chuanbai Yu
The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.Keywords:polypyrrole/hollow mesoporous silica particle;chromium(Cr);adsorption
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 8
·4483-4493
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IF 11.301
Liyun Zhang,Yi He,Pingya Luo,Lan Ma,Yi Fan,Shihong Zhang,Heng Shi,Shuangshuang Li,Yiling Nie
Developing superhydrophilic/underwater superoleophobic surfaces to restrict oil pollution during oil/water separation processes has been an effective approach. However, the inevitable adsorption and aggregation of organic contaminants onto the membrane surface from complex oily sewage usually causes an irreversible decrease in flux, damages the anti-oil-fouling properties and shortens the lifespan of the separation membrane. Thus, neoteric antifouling and renewable membranes are highly desired. Herein, based on stabilized PAN nanofibers and following the assembly of a heterostructured PPy/ZnO layer with hierarchical structure onto the nanofiber surfaces, we report a robust visible-light-induced self-repairable oil/water separation membrane. The SPAN–PPy/ZnO membrane displays superhydrophilicity (≈0°) and underwater superoleophobicity (>150°) toward different oils, with robust mechanical strength (Young's modulus ≈ 408 MPa) and a high underwater oil intrusion pressure (>120 kPa). Importantly, the as-prepared membrane not only exhibits ultrafast permeation flux and high separation efficiency for oil/dye/water emulsions, but it also displays robust recovery abilities (96%) from organic pollutants after 20 min of light irradiation. We anticipate that this composite membrane with outstanding separation capabilities and robust flux recovery capabilities can provide a novel method for the treatment and purification of large volumes of wastewater.
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Nano Research
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2020
·Vol. 13
·期 10
·2665-2672
·
IF 8.183
Tian Shufang,Chen Sudi,Ren Xitong,Hu Yaoqing,Hu Haiyan,Sun Jiajie,Bai Feng
Nanoparticle photosensitizers possess technical advantages for photocatalytic reactions due to enhanced light harvesting and efficient charge transport. Here we report synthesis of semiconductor nanoparticles through covalent coupling and assembly of metalloporphyrin with condensed carbon nitride. The resultant nanoparticles consist of light harvesting component from the condensed carbon nitride and photocatalytic sites from the metalloporphyrins. This synergetic particle system effectively initiates efficient charge separation and transport and exhibits excellent photocatalytic activity for CO 2 reduction. The CO production rate can reach up to 57 µmol/(gh) with a selectivity of 79% over competing H 2 evolution. Controlled experiments demonstrate that the combination of light harvesting with photocatalytic activity via covalent assembly is crucial for the high photocatalytic activity. Due to effective charge separation and transfer, the resultant nanoparticle photocatalysts show exceptional photo stability against photo-corrosion under light irradiation, enabling for long-term utilization. This research opens a new way for the development of stable, effective nanoparticle photocatalysts using naturally abundant porphyrin pigments.
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FIBERS AND POLYMERS
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2020
·Vol. 21
·期 6
·1300-1307
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IF 1.797
Ji Hui,Zhang Chuanjie,Rao Weida,Guo Bin,Fan Lingling,Bai Zikui,Bao Haifeng,Xu Jie
Cocozelle is essentially consisted of hemicellulose and lignin with a hierarchically porous structure. Herein, cocozelle slices after freeze-drying were employed as green substrates to support the growth of polypyrrole (PPy) via a facile oxidative polymerization approach. The cocozelle surface was densely covered with sheet-like PPy due to the hydrogen bonding between PPy and cocozelle. The PPy/cocozelle composites could be facilely utilized as supercapacitor electrodes, which showed a high specific capacitance of 1108 F g −1 with an energy density of 70.5 Wh kg −1 and a power density of 398 W kg −1 at a charge/discharge current density of 0.8 mA cm −2 as well as desirable cycling life with a capacitance retention rate of 76.9 % after 1000 cycles. Moreover, 95.3 % of the initial specific capacitance obtained at 0.2 mA cm −2 could be reached as the current density increased to 1.6 mA cm −2 . These results demonstrate that cocozelle could be used as a superior alternative biomass-derived substrate for the developments of eco-friendly and renewable energy storage devices.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Yin Hu,Ji Pan,Qi Li,Yongyuan Ren,Haojun Qi,Jiangna Guo,Zhe Sun,Feng Yan
Lithium–sulfur (Li-S) batteries with exceptional theoretical capacities and environmentally friendly characteristics have been investigated as next-generation energy storage devices. However, the dissolution and diffusion of polysulfide result in a rapid capacity degeneration, which hinders their practical application. Here, poly(ionic liquid) (PIL)-based core–shell structured nanofibers, poly(pyrrole)@poly(ionic liquid)–polyacrylonitrile (PPy@PIL–PAN), were prepared via electrospinning and followed by a surface polymerization of pyrrole. The as-prepared PPy@PIL–PAN nanofibers were implemented as a functional interlayer for Li-S batteries, and it is found that the cationic poly(ionic liquid) framework could selectively adsorb polysulfide species in the electrolytes, contributing to effective shuttle inhibition as well as stable sulfur electrochemistry. Moreover, this work sheds light on an efficient approach to improving the performance of Li-S batteries by using PIL-based functional interlayers.
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CHEMICAL ENGINEERING SCIENCE
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2020
·
IF 3.871
Fan Yang,Hussain Sadam,Yanqiu Zhang,Jianzhong Xia,Xiaobin Yang,Jun Long,Songwei Li,Lu Shao
Nanofiltration membanes play a critical role in alleviating global water scarcity, affecting more than 4 billion people. Herein, a new metal organic framework (MOF) sacrificicial strategy is designed to synthesize flux-enhancing nanofiltration membrane for efficient dye removal. With the aid of polyphenol chemistry, ZIF-67 MOF was first coated onto a porous support and in situ transformed into a selective layer by virtue of pyrrole polymerization. Trigerred by ammonium persulfate, polypyrrole selective layer functioalized nanofiltration membrane was fabricated when accompanying pore regulation by MOF self-sacrifice. The membrane demonstrated a flux enhancement of 745% than pristine polypyrrole (PPy) one with maintained rejection. Furthermore, the synergistic interactions among polypyrrole, polyphenol, and porous support endowed membrane with excellent stability during long term test. The designed MOF sacrificed route may open a new avenue for fabricating advanced energetic-efficient membranes with the reconstructed architecture towards diverse separation applications.
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MATERIALS & DESIGN
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2020
·
IF 6.289
Yanqin Wang,Yaping Zhu,Yanan Xue,Jinghui Wang,Xiaona Li,Xiaogang Wu,YiXian Qin,Weiyi Chen
It has great significance to develop a convenient and efficient method for hydrogels with adjustable electric and magnetic properties, which can be used in human activity monitoring and personal healthcare diagnosis field. However, it is a big challenge to balance the relationship between the conductive and magnetic categories so that electromagnetic hydrogels could be developed by an in-situ fabrication way. In this work, we firstly proposed a sequential in-situ route to form polypyrrole (PPy) and Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) in sequence within polyvinyl alcohol (PVA) matrix for the hybrid hydrogels with decent mechanical, conductive, and magnetic properties simultaneously, named as Fe 3 O 4 /PPy/PVA hydrogel. The as-prepared hybrid hydrogels exhibited continuous electrons transporting path and magnetic responsive properties. Specifically, a unique combination of high electrical conductivity (up to 1.95 ± 0.17 E −4 S cm −1 ), saturation magnetization (5.42 emu g −1 ) and greatly enhanced mechanical properties (tensile strength up to 575.03 ± 28.32 kPa, elasticity modulus up to 461.19 ± 24.75 kPa). More importantly, these hybrid hydrogels demonstrated potential applications in biomedical electronic devices, such as strain sensors and magnetic navigators.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 6
·1-7
·
IF 6.232
Tian Li,Wu Kexin,Hu Yue,Wang Yue,Zhao Yingjie,Chen Ruizhan,Lu Juan
An electrochemiluminescence (ECL) nanoprobe was fabricated for the determination of clenbuterol (CLB). A molecularly imprinted polymer (MIP) film was coated on the surface of the glassy carbon electrode modified with CdTe-doped multiwall carbon nanotubes. The MIP film with CLB as the template molecule improves the selectivity of the nanoprobe, CdTe is used as ECL signal amplifier, and MWCNT works as the carrier. The ECL intensity is altered by elution and reabsorption of CLB. The possible reaction mechanism and experimental parameters of the nanoprobe are discussed. Under optimized conditions, the quenched ECL intensity and the CLB concentration have a linear relationship in the range 2.3 × 10 −9 to 1.5 × 10 −5 mol·L −1 , and the detection limit is 1.0 × 10 −9 mol·L −1 (S/ N = 3). The nanoprobe was successfully applied to the determination of CLB in pork samples.
Schematic representation of the molecularly imprinted electrochemiluminescence nanoprobe based on complexes consisting of CdTe and multiwall carbon nanotube used to determinate clenbuterol.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Ting Xiao,Pengcheng Che,Shulin Wang,Wenjie Zhou,Fei Chen,Fujun Tao,Xuelin Chen,Xinyu Tan,Peng Xiang,Lihua Jiang,Xiaobo Chen
Carbon cloth (CC), a promising current collector with low weight and excellent robust mechanical property, has attracted increasing attention as the anode for supercapacitors recently. In this study, we show a novel two-prong strategy to remarkably enhance its capacitance via electrochemical activation and polypyrrole (PPy) deposition. The facile activation process created more active sites and induced oxygen-containing groups while the PPy layer provided extra capacitance contribution. Such strategy significantly boosted the capacitive property: The obtained PPy/ACC exhibited a high specific capacitance of ∼3.184 F cm −2 which is about 2.75 times the original CC within the potential window of −1.0–0 V in 1 M KOH electrolyte. A symmetric supercapacitor with the PPy/ACC as both the cathode and anode showed a high stable working voltage up to 1.8 V and a maximum energy density of 3.62 mWh cm −3 at 1.4 V. Moreover, an asymmetric supercapacitor employing it and Ni–Bi–S/Ni delivered an even higher energy density of 5.81 mWh cm −3 .
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RSC Advances
·
2020
·Vol. 10
·期 18
·10546-10551
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IF 3.119
Juanjuan Yin,Qingqing Liu,Jingxin Zhou,Lexin Zhang,Qingrui Zhang,Randi Rao,Shufeng Liu,Tifeng Jiao
A conductive hydrogel is a composite conductive material formed by combining a conductive polymer with a nanogel structure of a hydrogel. Conductive hydrogels not only have potential applications in supercapacitors, sensors, and modulators, they can also be synthesized by many methods, such as copolymerization, crosslinking, and grafting. In this work, we successfully prepared three conductive composite hydrogels by in situ polymerization, namely polypyrrole sodium alginate conductive hydrogel, ferric chloride-doped polypyrrole sodium alginate hydrogel and doped polypyrrole sodium alginate hydrogel with sodium dodecylbenzene sulfonate. In addition, a series of characterizations were performed for the three conductive hydrogels described above. The results show that the polypyrrole sodium alginate hydrogel doped with ferric chloride forms a nanofiber network with a more stable structure and better electrochemical performance.
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ANALYST
·
2020
·Vol. 145
·期 8
·3002-3008
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IF 3.978
Junning Wang,Tianxiang Wei,Yichen Liu,Mengyuan Bao,Rui Feng,Yuxuan Qian,Xue Yang,Ling Si,Zhihui Dai
Metal–organic frameworks (MOFs) have attracted great attention as enzyme mimic materials in colorimetric hydrogen peroxide (H2O2) detection. At present, it is highly desirable but remains challenging to prepare MOFs with high stability and dispersity to further improve their peroxidase-mimicking catalytic activity. In this work, we developed a new and facile method for the synthesis of a sub-100 nm peroxidase-mimicking zirconium porphyrin metal–organic framework (Zr-PorMOF) via a solvothermal method. The experimental results indicated that compared with the micron-sized crystals obtained using a classical synthesis method, the catalytic activity, stability and dispersity in water of the colloidal Zr-PorMOF were obviously enhanced. The as-synthesized colloidal Zr-PorMOF was further successfully applied in colorimetric H2O2 detection, and satisfactory detection performance was obtained. Furthermore, the colloidal Zr-PorMOF was also successfully employed in the construction of a peroxidase-based tandem catalysis system. Taking glucose oxidase as an example, this system was successfully applied for glucose sensing in real human serum samples, which proved its practical feasibility in diabetes diagnosis and indicates its high potential feasibility in peroxidase-related applications in complex biomatrix.
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ChemCatChem
·
2020
·Vol. 12
·期 9
·2469-2477
·
IF 4.853
Lidong Wang,Zhaosheng Zhang,Meng Li,Qiuhan Li,Bo Wang,Shuwen Wang,Huang Zhou,Boyang Mao
Graphical HER electrocatalysis : We developed a novel Pt(II)-porphyrin based catalyst for HER electrocatalysis, its optimised performance can be quantitatively designed in molecular level. The optimized Pt(II)-porphyrin loading and precisely morphology control could be fine-tuned and quantitatively premeditated by using fluorescence and UV-vis titration based on the unique π–π interactions behaviour of the porphyrin. This study provides a new approach for preparing a highly active and stable HER catalyst, which could potentially be extended to other reactions to improve the utilization efficiency of precious metal catalysts. Functionalised porphyrins have attracted considerable attention owing to their ability to coordinate with numerous metal ions. We design and synthesize a novel composite system based on functionalised Pt(II)-porphyrin and multiwalled carbon nanotubes for hydrogen evolution reaction (HER) electrocatalysis. Rather than qualitatively integrating porphyrin with carbon nanotubes, the optimized Pt(II)-porphyrin loading and precisely morphology control could be fine-tuned and quantitatively premeditated by using fluorescence and UV-vis titration based on the unique π–π interactions behaviour of the porphyrin for the first time. The as-prepared composites exhibit superior HER catalytic activity with an overpotential of 35 mV for an electrocatalytic current density of j=−10 mA cm −2 and a Tafel slope of 32.3 mV dec −1 . Moreover, such catalysts do not exhibit observable activity decay after a 1000-cycle stability test, thus demonstrating their excellent durability. To further reduce Pt loading to achieve cost efficiency, we develop a Pt−Co bimetallic HER catalyst with an ultra-low platinum content through a straightforward synthesis pathway with high catalytic activity and stability. This study provides a new approach for preparing a highly active and stable HER catalyst, which could potentially be extended to other reactions to improve the utilization efficiency of precious metal catalysts.
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