DESALINATION
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2020
·
IF 7.098
Weifeng Liu,Guang Yan,Erhui Zhang,Qi Liang,Lei Qin,Meiling Wang,Xuguang Liu,Yongzhen Yang
A novel lithium ion imprinted membrane (Li + -IIM) was synthesized by unipolar pulsed electropolymerization , using lithium ion as template ion, 2-hydroxymethyl-12-crown-4 ether as capture agent, pyrrole as conductive agent and crosslinking agent. The morphology and structure of the products were characterized by using field emission scanning electron microscopy and Fourier transformation infrared spectroscopy . The adsorption behaviors were detected by inductively coupled plasma-optical emission spectrometry . At pH = 1.0, the maximum adsorption capacity of Li + -IIM towards lithium ion reached 16.40 mg g −1 in 40 mg L −1 Li + solution, within 80 min. The resulting Li + -IIM exhibited excellent selectivity for Li + because the selectivity coefficients of Li + with respect to Na + , K + , Mg 2+ , Al 3+ and Fe 3+ are 4.20, 4.11, 4.13, 4.30 and 4.28, respectively. After five adsorption-desorption cycles, the adsorption capacity of Li + -IIM still maintained 95.88%, indicating that the obtained imprinted membrane has excellent regeneration ability.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 8
·5100-5112
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IF 3.553
Zhang Guanhua,Li Xiaojing,Liu Huaizhi,Wei Donghai
Iron oxides have attracted widespread attention as lithium-ion batteries anode in virtue of abundant resources, high theoretical capacity, and environmental friendliness. However, during the process of charging and discharging, the poor conductivity and large volume expansion of iron oxides lead to the pulverization of the material as well as the rapid capacity fading, which limits further application significantly. Hence, tiny Fe 3 O 4 nanoparticles encapsulated into double layers N -doped hollow carbon nanotubes (NHCNT/Fe 3 O 4 ) are synthesized by a controllable chemical bath deposition and subsequent carbonization treatment. Benefitting from the double carbon buffer layers and the outstanding N -doped carbon conductive network, the well-designed NHCNT/Fe 3 O 4 electrode delivers an excellent cycling stability with 87% capacity retention at 1 A g −1 after 1000 cycles and a remarkable rate performance. And hollow N -doped carbon nanotubes (NHCNT) displays a favorable reversible capacity of 350 mAh g −1 in the 500th cycle at 1 A g −1 . The in-depth kinetic analysis reveals the dominated capacitive contribution facilitate to realize a superior rate capability of NHCNT/Fe 3 O 4 anode. The excellent electrochemical performance exhibited by the NHCNT/Fe 3 O 4 composites material provides great innovative ideas and inspiration for the design of the next-generation lithium-ion battery anode materials.
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RSC Advances
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2020
·Vol. 10
·期 68
·41503-41510
·
IF 3.119
Jia Wen,Yang Ding,Jiang Zhong,Ruyi Chen,Fei Gao,Yongluo Qiao,Changqing Fu,Jinglan Wang,Liang Shen,Haifeng He
In this paper, large-scale, self-standing polypyrrole/graphene oxide (PPy/GO) nanocomposite films were prepared by an environmentally friendly and easy-to-operate confined polymerization method, and were also assembled as electrode materials for symmetric all-solid-state supercapacitors. In this paper, large-scale, self-standing polypyrrole/graphene oxide (PPy/GO) nanocomposite films were prepared by an environmentally friendly and easy-to-operate confined polymerization method, and were also assembled as electrode materials for symmetric all-solid-state supercapacitors. The morphology, chemical structure and electrochemical property were characterized by field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR), cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS), respectively. The lamellar structure of GO and both strong interaction with ice and pyrrole could promote polymerization of pyrrole and improve the compactness of the film. With the aid of GO, the conjugation length of PPy increased, the resistance of the material decreased, and the electrochemical energy storage of the composite film was significantly enhanced. In the case of 2.5 wt% GO, the prepared PPy/GO nanocomposite supercapacitor exhibited a high area specific capacitance of 97.3 mF cm−2 at 1 mA cm−2. Furthermore, the PPy/GO film supercapacitor also showed excellent cycling stability and good flexibility.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Mingmei Shen,Xianwen Kan
Specifically sensitive determination of dopamine (DA) from complex real samples is very important since DA plays a major role in the function of central nervous, which presents the necessary to develop an effective sensor for the assay of DA. In this work, a dual recognition strategy was developed through introducing DA-aptamer and molecularly imprinted polymer (MIP) on gold nanoparticles (AuNPs) and reduced graphene oxide (rGO) modified electrode. The selectivity and sensitivity of the prepared sensor were investigated upon the current response of DA itself to better represent the performances of the sensor. Compared with the single recognition element (MIP or aptamer) based sensors, the prepared dual recognition sensor displayed the highest selectivity to DA, which facilitated the proposed sensor for the detection of DA in real samples. Owing to the high surface and good conductivity of the modified AuNPs and rGO, the sensor showed a wide linear range and a low limit of detection of 5.0 × 10 -8 – 1.0 × 10 -5 mol/L and 4.7 × 10 -8 mol/L for the detection of DA, respectively. The proposed strategy of aptamer and MIP based sensor for electro-active target assay may be used as a general way for the development of other dual recognition based sensors.
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Jian Zhang,Zixuan Yan,Xingzheng Liu,Yu Zhang,Haikui Zou,Yuan Le,Jian-Feng Chen
Renewable bio-based electromagnetic interference (EMI) shielding materials receive increasing attention undoubtedly. However, there is still a challenge to use raw biomass materials to construct a significant structure through an effortless and environmental route for EMI shielding applications. Herein, for the first time, we demonstrated a hybrid composite of multi-walled carbon nanotube/polypyrrole/chrome-tanned collagen fiber (MWCNT/PPy/CF), which utilized waste chrome shavings as a matrix. X-ray photoelectron spectroscopy reveals that the chromium on the CF has a binding effect on the PPy layer, which endows the tight integration between the CF and PPy layer. After the MWCNT network was loaded on the PPy layer, this ternary structure could provide stable conductive paths and a rich number of polarized interfaces. The MWCNT/PPy/CF composite exhibits superior electrical conductivity (354 ± 52 S/m), higher than PPy/CF (222 ± 38 S/m) and MWCNT/CF (104 ± 11 S/m), owing to the synergy of dual conductive structures. Notably, the shielding effectiveness (SE) value of the MWCNT/PPy/CF composite reaches 30 dB in the X band at a thickness of 0.48 mm. The shielding effectiveness of reflection (SER) (9.1 dB) is similar to that of PPy/CF (8.2 dB), while the shielding effectiveness of absorption (SEA) is significantly improved from 15.3 dB (PPy/CF) to 20.4 dB (MWCNT/PPy/CF) due to the additional coverage of the MWCNT network. This indicates the synergy between the MWCNT network and conductive PPy/CF skeleton. This work provided a method to prepare sustainable and low-cost renewable EMI shielding materials using chrome shavings. Meanwhile, this novel structure combining a conductive skeleton and heterostructure can be considered as a potential application in relevant fields.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Lijie Zhong,Xuan Jiang,Runqiu Zhang,Jiahui Shao,Lina Chi,Yalin Wang,Jinping Jia,Diwen Ying
Mixed salt from the concentrated brine that contains NaCl and Na 2 SO 4 has been classified as hazardous waste since 2016 in China. This fact created an urgent and tremendous demand to treat these brine promptly. In this paper, we reported a method of using selectrodialysis with the bipolar membrane (BMSED) to reutilize the concentrated brine to produce high-purity HCl, NaOH, and Na 2 SO 4 , which fulfilled the demand above. The selective PPy(Cl) composite membrane, which was able to separate NaCl and Na 2 SO 4 in the concentrated brine, was prepared. The 3.5 μm PPy(Cl) film significantly enhanced the selectivity of the anion exchange membrane (AEM) to chloride ions while sulfate ions were blocked. The BMSED stack with our multilayer PPy(Cl) composite AEM produced 1.23 mol/L HCl with a purity higher than 98.2%. More importantly, the prepared PPy(Cl) composite AEM was not only suitable for brine with a high Cl − /SO 4 2− of 19:1, which was the typical ratio in concentrated brine from the coal chemical industry, but also able to treat the brine with a Cl − /SO 4 2− as low as 1:1, showing superior capability. The effluent of the BMSED we developed, which contained 0.02 mol/L Na 2 SO 4 with the Cl − /SO 4 2− equaling to 1:1, could be further concentrated by reverse osmosis for sea water (RO-SW) and freeze crystallization to obtain Na 2 SO 4 with a high purity accordingly. This reutilization route of concentrated brine was very green because it not only produced no hazardous waste, but also recycled valuable products. Therefore, it was believed a promising application in the coal chemical industry.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 42
·18225-18232
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IF 3.288
Ji Feng,Yong-Liang Yu,Jian-Hua Wang
Herein, novel carbon dots (CDs) with efficient antibacterial activity are prepared by a simple cyclization reaction of 4-formylbenzoic acid and pyrrole and cross-linking with p-phenylenediamine at room temperature. The CDs exhibit the fluorescence property of red emission, greatly reducing the noise interference from bacterial autofluorescence in fluorescence imaging. At the same time, the CDs with the feature of red absorption facilitate the achievement of light excitation of deep tissues in the living body. Owing to the introduction of the porphyrin ring structure as a photosensitizer, the CDs are able to trigger the generation of singlet oxygen. When excited by a 638 nm laser and irradiated for 20 min, 10 μg mL−1 CDs can achieve complete bacterial extinction. Laser confocal microscopy imaging further demonstrates that the CDs act on the outside of bacteria and generate reactive oxygen species under red light irradiation, providing a non-multidrug resistant sterilization method.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·7122-7128
·
IF 12.732
Yukun Sun,Xupeng Zong,Dan Qu,Ge Chen,Li An,Xiayan Wang,Zaicheng Sun
Solar water evaporation is a sustainable and efficient way to produce fresh water. Identifying highly efficient photothermal materials is an important step for achieving high evaporation rates. However, the effects of the water interfacial area are rarely paid any attention, although a few reports have demonstrated high evaporation rates from micro-/nanostructured devices. In this work, we introduce a new term, water mass per unit surface area (WMUA), to connect the water mass and interfacial area. We can regulate WMUA using different commercial porous materials to realize water management in devices, which further affects the evaporation rates. The optimized device is composed of suedette sponge, filter paper, and polydopamine as the water-transportation, water-restrictive, and photothermal materials, respectively, and it achieves an evaporation rate of 1.8 kg m−2 h−1 and energy efficiency of ∼92%. This presents a new strategy for the rational design of device structures and the promotion of evaporation rates, pushing this field into new areas.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yafu Tang,Yuechao Yang,Shanmin Hou,Dongdong Cheng,Yuanyuan Yao,Shugang Zhang,Jiazhuo Xie,Xiaoqi Wang,Xiaoxiao Ma,Zhen Yu,Shan Li
Iron (Fe) chelated by water-soluble humic substances can effectively overcome plant micronutrient deficiencies. However, the traditional synthesis methods are often complex, expensive, and thus not applicable to large-scale industrial productions. In this work, an ecofriendly and multifunctional Fe–humic acid (HA) complex was successfully prepared through simply ball milling lignite with double-shelled Fe–N hollow mesoporous carbon microspheres (DS–Fe–N–HC). The novel DS–Fe–N–HC was synthesized using a simple strategy and was first applied in activating HA from lignite by solid-phase ball milling to attain the water-soluble HA–iron fertilizer (WHIF). The physicochemical properties of the DS–Fe–N–HC nanocomposites and WHIF were systematically characterized by a series of techniques. A traditional Fe–HA complex is mainly obtained by mixing HA and iron ions, which has poor water solubility because HA is not activated. In comparison to samples prepared with other methods, WHIF contained more stable water-soluble HA. Furthermore, the as-obtained WHIF had higher amounts of proteins and amino sugar tannin as evidenced in FT-ICR MS analysis. Moreover, WHIF contributed to higher activities in chlorophyll content, height, steam diameter, and biomass of peanuts than other samples. The results demonstrate that WHIF is effective in reducing symptoms of iron deficiency in peanuts, which can be attributed to its iron-based compounds and water-soluble HA. The findings of this study provide a promising, cost-effective, and environmentally friendly solution to mitigate iron deficiency and promote the growth of peanuts for large-scale agriculture production.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Gongyu Wen,Yulei Sui,Xiaoping Zhang,Jiangpeng Li,Ziwei Zhang,Shengkui Zhong,Shibao Tang,Ling Wu
Lithium-sulfur batteries have attracted numerous attentions owing to their high theory discharge specific capacity and energy density . However, sulfur cathode usually suffers from poor cycle stability and slow reaction kinetics, caused by its poor conductivity, excessive volume changes during charge/discharge processes, complex sulfur species conversion reaction and the dissolution of polysulfide intermediates. Here, we present a free-standing framework of Mn 3 O 4 nanoparticles combine with polypyrrole (PPy) nanotubes as host materials for lithium-sulfur batteries to overcome these issues. In this construction, PPy nanotubes serve as the excellent container of sulfur and physical barrier for the excessive volume expansion of sulfur during electrochemical reaction processes, and the nanotubes also provide an efficient conductive network for the rapid transmission of electrons and ions, while Mn 3 O 4 nanoparticles facilitate trapping lithium polysulfides. The coordination of PPy nanotubes and Mn 3 O 4 effectively alleviate the shuttle effect as well as enhance the utilization of sulfur. The obtained PPy@Mn 3 O 4 -S sample shows high capacities of 1419.9 and 925.5 mAh g −1 at 0.1 C and 1 C rate, respectively, and exhibits a low capacity fading rate of 0.062% per cycle for 800 cycles at 1 C rate. This work provides a new and effective way for the design of lithium-sulfur batteries with both high rate performance and long cycle stability.
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PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Fang Liu,Weidong Liang,Chengjun Wang,Jingxian He,Chaohu Xiao,Zhaoqi Zhu,Hanxue Sun,An Li
Solar-driven water evaporation is emerging as a promising strategy to utilize solar energy for the desalination and water purification . In this work, two kinds of monoliths based on hypercrosslinked polymers (HCPs) nanotubes , which were synthesized using inexpensive and conventional chemicals, i.e. benzene and methylbenzene as building blocks via Friedel-Crafts reaction, have been created as photothermal materials through a superhydrophilic modification followed by the coating of polypyrrole as light absorption layer . The as-synthesized HCPs possess large specific surface area (up to 773 m 2 g -1 ) and low apparent density (0.011 g cm -3 ), which endow them very low thermal conductivity (0.029 W m -1 k -1 ). After modification with sodium alginate and polypyrrole, the resulting HCPs (named as PPy-M-HCPs) show surface superhydrophilicity (water contact angle ~0°), stronger light absorption (ca. 95%) and better mechanical properties . Taking advantages of these unique physicochemical properties mentioned above, the PPy-M-HCPs exhibit outstanding light-to-heat conversion performance with a high solar conversion efficiency of ca. 87% achieved under 1 kW m -2 irradiation. In addition, the PPy-M-HCPs also show excellent salt-resistant performance, e.g. a high energy conversion efficiency of more than 85% obtained in 20 wt% NaCl solution, due to their loosely porous structure coupling with their superhydrophilic wettability . Based on the merits of simple fabrication process, excellent stability and high solar conversion efficiency, the PPy-M-HCPs may have great potentials as efficient photothermal materials for real applications.
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CARBON
·
2020
·
IF 8.821
Baoxi Zhang,Yuxin Ying,Yixue Zhu,Yinan Jiang,Yongxia Zhang,Yunfeng Qiu
Interphase in polymer composites plays a key role in enhancing their multi-functionality. Herein, an effective strategy is designed to optimize the interphase microstructure in graphene foam/PDMS (PDMS/GrF) using polypyrrole (PPy) nanowires (denoted as PDMS/GrF@PPy). The interfacial microenvironment of graphene foam is successfully modified by anchoring polypyrrole nanowires, showing strong interfacial strength with PDMS . The tensile strength , Young’s modulus, electrical conductivity , thermal conductivity , mechanical durability and electron-photo-thermal deicing efficiency of PDMS/GrF@PPy composites are simultaneously higher than that of PDMS/GrF composites. Molecular simulations further illustrated that the interfacial interaction energy increased from 100.4 to 280.2 kcal/mol after introducing PPy nanowires between GrF and PDMS. As a proof of concept for deicing application, PDMS/GrF@PPy composites displays excellent deicing efficiencies of 82.9% and 55.7% by Joule heat and NIR irradiation after 500th stretching cycles, respectively, which is obviously outperforming PPy@GrF composites (58.3% and 44.2%). Consequently, PPy nanowires not only optimizes the interfacial strength of polymer composites, but also endows them with multi-functionalities, providing promising candidates of deicing, strain sensor, thermal interface management, etc.
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