SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yongli Shi,Jie Feng,Zhaoxin Zhang,Ningning Cao,Jiahao Li,Heping Li,Linji Li,Quanxian Hua,Qun Ma,Kai Zhang
Polypyrrole-based adsorbents have emerged in removing Cr(VI) from wastewater based on their reduction, chelation, electrostatic attraction and ion exchange. However, it is still a formidable challenge to remove metal cations simultaneously due to electrostatic repulsion. In fact, metal ions originating from industrial activities such as chemical manufacturing and metal electroplating are always complex and multifarious. Here, we report a EDTA-crosslinking-chitosan/polypyrrole composite (EDTA-CS/PPy) with multiple types of adsorption sites (carboxyl, hydroxyl, amino), successfully realizing simultaneous removal of Cr(VI) anions and other metal cations. The maximum adsorption capacities of Cr(VI), Cu(II), Pb(II) and Cd(II) reach up to 401.25, 59.03, 77.81 and 68.31 mg/g, respectively. The adsorption mechanism is attributed to coupling interactions of the reduction, chelation, electrostatic attraction and ion exchange between targeted metal ions and EDTA-CS/PPy, investigated by experiments and DFT theories. Notably, the adsorption capacity of EDTA-CS/PPy keeps stability after three adsorption–desorption cycles. These findings may promote potential applications of EDTA-CS/PPy adsorbents in highly efficient treatment of coexisting toxic metal ions from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Kai Sun,Xuechun Yang,Yuan Yuan,Jinjiu Qi,Boyang Liu,Andrey Karlovich Sarychev,Runhua Fan
Microwave absorbers have been developed to counter electromagnetic pollution, and enhancing their performance remains an ongoing concern. In this paper, carbon-coated Fe 3 O 4 and polypyrrole (PPy) were combined to construct composites with a core-double-shell structure, and the influences of multiple synergistic effects from ternary components, carbon defects, and microstructure on the electromagnetic properties of Fe 3 O 4 @C@PPy composites were investigated. The Fe 3 O 4 @C@PPy composites were successfully prepared by the low-temperature self-propagation method and in-situ oxidation polymerization process, achieving a −53.67 dB reflection loss at 12.24 GHz when the sample thickness was 2.13 mm, and the effective absorbing (RL < 10 dB) band covered 4.16 GHz (13.84–18 GHz) with a corresponding thickness of only 1.63 mm. The core-double-shell structure perfectly integrated various advantages of each component as well as provided multiple reflections and scatterings. Meanwhile, the polarization loss was notably enhanced by heterogeneous interfaces, and the dielectric-magnetic loss mechanism cooperatively accelerated the dissipation of electromagnetic wave energy.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Shuxia Li,Jia-Horng Lin,Hai-Tao Ren,Bing-Chiuan Shiu,Fei Sun,Ching-Wen Lou,Ting-Ting Li
Oil spills and the discharge of organic wastewater have posed a severe danger to environmental security. To address this issue, various functional oil/water separation materials for wastewater purification have been developed. In this work, MXene/PPy was loaded on PP fiber by simple in-situ polymerization and vacuum-assisted filtration technology. Polypropylene was modified by dopamine (PDA) through in-situ polymerization, to improve the loading fastness of MXene/PPy on the surface of PP. To increase the durability of the fiber membrane, the pH-responsive polymer (PDM) was simply immersed on the outer layer. The successfully prepared PP-MXene/PPy-PDM has excellent pH response and photothermal conversion performance. When pH= 2, the water contact angle (WCA) was 52°. When pH= 12, WCA was 125°. The surface of PP-MXene/PPy-PDM was heated to 104.6 ℃ in ten minutes under the irradiation of 2 kW·m −2 . PP-MXene/PPy-PDM could continuously separate oil/water mixture for 12 h, and the highest separation flux was 3.87 kg·m −2 ·h −1 . Moreover, PP-MXene/PPy-PDM has excellent stability, corrosion resistance and recyclability . This study provided a new strategy for preparing intelligent responsive fiber composite membrane for oil-water separation, which has a wide range of practical applications in the treatment of oily wastewater.
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Xiaoyu Zhang,Keyu Feng,Peng Yin,Yuqi Pan,Yujie Liu,Fanglei Zeng,Ning Li,Gang Yi,Zhongwei Wang
The flexible sensor with self-healing performance can heal itself when the sensor is damaged by the outside world, so it can significantly improve the service life of the sensor and reduce the repair cost, which has attracted widespread attention. However, currently, most flexible sensors with self-healing performance have problems such as single repair conditions and difficulty in balancing mechanical performance and repair efficiency. In this study, polypyrrole modified carbon nanotubes (PPY/CNTs) were first made, and then, inspired by the Chinese traditional myth “Nuwa Fuxi”, a multiple dynamic crosslinking self-healing composite poly(siloxane-urethane) conductive elastomer (CPUSi) was successfully developed. The prepared CPUSi has excellent mechanical properties (11.27 MPa) and total shear repair efficiency (84%) under the excitation of multiple dynamic reversible interactions. At the same time, the surface scratch of CPUSi can be self-healing under multiple conditions such as heating at 60 °C, infrared light and ultraviolet light. The scratch repair efficiency is up to 99.9% under infrared light for 2 h. in addition, CPUSi has cyclic response to temperature and strain, so the material has broad application prospects in sports monitoring, electronic skin, intelligent wear, brain-computer interface and other fields
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 48
·2303781
·
IF 13.3
Yikun Yi,Feng Hai,Jingyu Guo,Xin Gao,Wenting Chen,Xiaolu Tian,Wei Tang,Weibo Hua,Mingtao Li
The energy density of lithium-sulfurized polyacrylonitrile (Li-SPAN) batteries has chronically suffered from low sulfur content. Although a free-standing electrode can significantly reduce noncapacity mass contribution, the slow bulk reaction kinetics still constrain the electrochemical performance. In this regard, a novel electrochemically active additive, polypyrrole (PPy), is introduced to construct PAN nanotubes as a sulfur carrier. This hollow channel greatly facilitates charge transport within the electrode and increases the sulfur content. Both electrochemical tests and simulations show that the SPANPPy-1% cathode possesses a larger lithium-ion diffusion coefficient and a more homogeneous phase interface than the SPAN cathode. Consequently, significantly improved capabilities and rate properties are achieved, as well as decent exportations under high-sulfur-loading or lean-electrolyte conditions. In-situ and semi-situ characterizations are further performed to demonstrate the nucleation growth of lithium sulfide and the evolution of the electrode surface structure. This type of electrochemically active additive provides a well-supported implementation of high-energy-density Li-S batteries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Lizhong He,Zengpeng Guo,Najeeb ur Rehman Lashari,Gexi Wang,Mengbin Li
To cater to the mushrooming advanced energy storage devices need, designing and preparing novel electrode materials with excellent electrochemical properties (including high capacitance and prominent cycling stability) are urgent but challenging. Here, we successfully synthesized 3D hierarchical NiCo 2 O 4 @Co 3 S 4 @MnS@PPy (NC@CS@MS@PPy) core-sheath nanowire arrays grown on highly conductive carbon cloth using a multistage process. Owing to a lot of synergy between the multiple components in the as-obtained composite, the prepared electrode material indicates an excellent specific capacitance of 2.67 F cm −2 at 1 mA cm −2 or 2557.58 F g −1 at 1 A g −1 and high cycling stability (83.64 % capacitance retention after 20,000 cycles even at a high current density of 20 mA cm −2 ). When coupled with the activated carbon (AC, as a negative electrode), the assembled all-solid-state NC@CS@MS@PPy//AC asymmetric supercapacitor (ASC) device showed outstanding electrochemical properties with a high area specific capacitance 684.38 mF cm −2 at 3 mA cm −2 and better long-term cycling stability (96.76 % retention of the initial capacitance after 20,000 cycles). More importantly, by taking advantaging of the multiple compositional merits and structural features of the positive electrode , the device delivered the highest energy density of 81.1 Wh kg −1 at 800 W kg −1 and retained 26.2 Wh kg −1 at the highest power density of 16 KW kg −1 . Furthermore, two ASCs connected in series powered 20 red light-emitting diodes (LEDs) for >10 min. This work manifests that the prepared hierarchical NC@CS@MS@PPy core-sheath nanowire arrays have impressive potential as high-performance electrodes for supercapacitor.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chi Zhang,Ye Chen,Qing Wen,Yang Yang,Desong Qiao,Linhan Zhong,Cen Bi
The limited power output of microbial fuel cells (MFCs) has impeded their widespread adoption application. Thoughtful selection of a suitable anode material not only enhances extracellular electron transfer (EET) efficiency but also stimulates microbial adhesion and proliferation. Herein, a three-dimensional conductive polymer hydrogel MXene/(polypyrrole)-(polyacrylamide) (MPP) is proposed, which can enhance the power generation performance of the bioanode by promoting the enrichment of microorganisms in the two-dimensional direction. The integration of hydrogel molecular chains within the layers of MXene effectively inhibits the self-aggregation of MXene layers, thereby facilitating the formation of ion transport channels for expedited charge storage. As a result, the maximum power density increases from 3.12 W/m 3 (CF) to 6.71 W/m 3 (MPP-25), the protein content of MPP-25 bioanode (59.66 ± 2.39 mg/cm 2 ) is 3.34 times higher than that of CF (17.85 ± 1.53 mg/cm 2 ), and the exchange current density value increases from 0.06 mA/cm 2 (CF) to 0.26 mA/cm 2 . Conductive hydrogels prepared by MXene as a modifier are a promising bioelectrocatalyst for high-performance MFCs.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yao Shen,Siqi He,Yongyue Zhuang,Shuchen Huang,Chunfeng Meng,Aihua Yuan,Wenhua Miao,Hu Zhou
One-dimensional metal/N-doped carbons have exhibited promise for use as efficient catalysts of the oxygen reduction reaction (ORR). In this work, Fe,N-doped carbon nanotubes (Fe-NC@NCNT) are developed by pyrolyzing the precursor/template of a polypyrrole (PPy) nanotube-anchored Fe/Zn-based zeolite imidazole framework. Thanks to the hierarchical tubular nanostructure, high electronic conductivity, and abundant Fe-based species (Fe-Nx sites and Fe/Fe3C nanoparticles), the designed electrocatalyst exhibits a catalytic property comparable to that of commercial Pt/C. Specifically, the Fe-NC@NCNT catalyst undergoes a four-electron ORR pathway with an onset potential of 0.96 V and a half-wave potential of 0.88 V versus reversible hydrogen electrode, a small Tafel slope of 60.0 mV dec–1, remarkable long-term cycle durability, as well as strong alcohol tolerance in an alkaline electrolyte. When applied to the air-electrode catalyst of rechargeable zinc–air batteries, the Fe-NC@NCNT-catalyzed liquid-state battery delivers an open-circuit voltage of 1.44 V and a maximum power density of 115 mW cm–2 with a specific capacity of 814 mAh g–1, outperforming those of the battery assembled with commercial Pt/C + RuO2. In addition, the as-assembled solid-state battery displays a desirable rechargeability and electrochemical flexibility. The present study establishes a facile dual-template approach to fabricate highly efficient and inexpensive ORR electrocatalysts toward the application of metal–air batteries.
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2023
·Vol. 16
·期 13
·5112
·
IF 3.2
Jinlin Liu,Yu Wang,Zilong Zhong,Zhou Zhou,Dongliang Chen,Weijie Wang,Shuaixing Mai
Air-conditioning systems account for 40–60% of the energy consumption of buildings, and most of this figure corresponds to the cooling and dehumidification process of air-conditioning units. Compared with traditional compressed air-conditioning systems, solid adsorption dehumidification systems possess good potential to improve indoor air quality and reduce buildings’ energy consumption. However, there are still some problems that prevent the use of solid adsorption dehumidification systems, such as their complexity and high regeneration temperatures. The key to solving the above problem is the discovery of more suitable adsorbents. In this paper, poly N-isopropylacrylamide/polypyrrole (PNIPAm/PPy) hydrogel was selected as the research object, and the performance of the dehumidification material and its potential for application in solid dehumidification systems were studied. It was found that the pore structure of PNIPAm/PPy was relatively complex and that there were abundant pores with uneven pore sizes. The minimum pore size was about 4 μm, while the maximum pore size was about 25 μm, and the pore sizes were mostly distributed between 8 and 20 μm. Abundant and dense pores ensure good hygroscopic and water-releasing properties of the resulting hydrogel. The PPy inside the hydrogel acts as both a hygroscopic and photothermal agent. In an environment with a relative humidity of 90%, 60%, and 50%, the hygroscopic efficiency of PNIPAm/PPy reached 80% in about 75, 100, and 120 min, and the corresponding unit equilibrium hygroscopic capacity values were 3.85 g/g, 3.72 g/g, and 3.71 g/g, respectively. In the initial stage, the moisture absorption increased with the increase in time; then, the increase in moisture absorption decreased. When the temperature was below 40 °C, the hygroscopic performance of PNIPAm/PPy was almost temperature-independent. The PNIPAm/PPy with different thicknesses showed similar moisture absorption efficiency. The lowest desorption temperature of PNIPAm/PPy was 40 °C, which indicates that low-grade energy can be used for material desorption. And the higher the temperature, the faster the desorption rate of PNIPAm/PPy and the higher the desorption amount. It can be seen that the PNIPAm/PPy hydrogel presents good desorption performance and can be used repeatedly.Keywords:heat and mass transfer in porous media;dehumidification material;hydrogel;solid dehumidification system;hygroscopic efficiency;desorption performance
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Subin Jiang,Xiang Ji,Tengfei Yu,Feng Liu,Meizhen Gao
The suitable proportion of diffusion contribution during the electrochemical process could influence the electrochemical performance of electrode materials. An effective method is that tuning the diffusion reaction contribution via doping heteroatom, introducing defects or surface modification. In this work, a unique core-shell structure material Cu-Mn-Co LDO-C is obtained. Benefitting from Cu pre-doped into Mn Co LDO, large amount of oxygen vacancies is introduced to enhance electrochemical performance; N-6 doped porous carbon shell protects Cu-Mn-Co LDO core and improves electrochemical performance of Cu-Mn-Co LDO-C further. In addition, doping Cu broadens potential window of Cu-Mn-Co LDO-C surprisingly. Cu-Mn-Co LDO-C presents 5028.7 mF cm −2 at a current density of 1 mA cm −2 with a facilely reached potential window of 0–0.65 V finally, and retains 73.4 % diffusion contribution at a scan rate of 1 mV s −1 , 18.3 % at 100 mV s −1 . After 10,000 cycles at 2 mA cm −2 , Cu-Mn-Co LDO-C keeps 90.3 % of initial capacitance. Using Cu-Mn-Co LDO-C as positive and Fe 3 O 4 -C as negative to fabricate a solid flexible asymmetrical supercapacitor (SAS), this SAS presents a considerable energy density that attribute to the high working potential of positive Cu-Mn-Co LDO-C. SAS could working stably at a potential window of 0–2.2 V, and presents the highest energy density 243.1 μWh cm −2 at a power density of 2.8 mW cm −2 , remains 203.0 μWh cm −2 at the highest power density of 55.4 mW cm −2 . A hand ring that was assembled by three SAS which contacted in series could light a highest rated voltage white LED more than 10 min. As a result, Cu-Mn-Co LDO-C is an ideal candidate for flexible positive electrode in the field of smart, portable energy storage.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jie Chen,Wan-jun Jiang,Zhu Zeng,De-xiang Sun,Xiao-dong Qi,Jing-hui Yang,Yong Wang
Porous polymer-based conductive composites are highly regarded for their accomplishments of being applied in the field of electromagnetic interference (EMI) shielding, but fabrication of high-performance porous EMI shielding materials with the ability to realize self-fixable shielding effectiveness (SE) adjustment is still challenging. Herein, ethylene–vinyl acetate copolymer (EVA)@polypyrrole (PPy)@Ag (EPA) foam composites are fabricated by modifying EVA foams with PPy and Ag nanoparticles (AgNPs) in succession. In this system, EVA foam serves as shape memory frameworks to endow this composite with shape memory effect (SME), and PPy is employed to reinforce the interaction between the Ag layers and the EVA foam. Profiting from the reinforced conductive network, the EPA foam composites exhibit electro-thermal performance with a heating temperature of 81.1 °C at a voltage of 1 V and EMI shielding performance with a SE of 107.45 dB within the X-band. Importantly, depending on the SME, the SE of the EPA foams can be easily tuned by controlling and fixing the compressive strain. Moreover, the EPA foams can also serve as sensors for monitoring different actions. By virtue of the above merits, the EPA foams are promising to serve as multifunctional electronics, involving smart EM protection devices and wearable sensors.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 9
·2108
·
IF 5
Shi-Chang Hou,Dao-Wei Zhang,Jun Chen,Xiao-Xiao Guo,Abdul Haleem,Wei-Dong He
Because of the increasing scarcity of water resources, the desalination of seawater by photothermal evaporation with harvested solar energy has gradually become a popular research topic. The interconnected macroporous cryogel prepared from polymerization and crosslinking below the freezing temperature of the reactant solution has an excellent performance in photothermal water evaporation after loading photothermal materials. In this study, polyacrylamide (PAM) cryogels were prepared by cryo-polymerization and sulfonated in an alkaline solution containing formaldehyde and Na2SO3. Importantly, the evaporation enthalpy of water in sulfonated PAM cryogel was reduced to 1187 J·g−1due to the introduction of sulfonate groups into PAM, which was beneficial to increase the photothermal evaporation rate and efficiency. The sulfonated PAM cryogels loaded with polypyrrole and the umbrella-shaped melamine foam substrate were combined to form a photothermal evaporation device, and the evaporation rate was as high as 2.50 kg·m−2·h−1under one-sun radiation. Meanwhile, the evaporation rate reached 2.09 kg·m−2·h−1in the 14 wt% high-concentration saline solution, and no salt crystals appeared on the surface of the cryogel after 5 h of photothermal evaporation. Therefore, it was evidenced that the presence of sulfonate groups not only reduced the evaporation enthalpy of water but also prevented salting-out from blocking the water delivery channel during photothermal evaporation, with a sufficiently high evaporation rate, providing a reliable idea of matrix modification for the design of high-efficiency photothermal evaporation materials.Keywords:polymeric cryogel;polyacrylamide;photothermal evaporation;evaporation enthalpy;sulfonating modification
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）