ENVIRONMENTAL TECHNOLOGY
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2022
·
IF 3.475
Mingxing Chen,Qinming Guo,Jinping Cui,Weiyang Lv,Yuyuan Yao
Developing high-performance adsorbent for hexavalent chromium (Cr(VI)) elimination presents an enticing prospect in environmental remediation. Herein, three-dimensional flowerlike nanospheres composed of molybdenum disulphide and polypyrrole (MoS2@PPy) were successfully prepared via a one-pot hydrothermal and subsequent carbothermal reduction process for the removal of Cr(VI). The effects of pH, adsorbent dosage, co-existing ions, initial Cr(VI) concentration and temperature were investigated systematically by batch experiments. Benefiting from the incorporation of MoS2, the obtained MoS2@PPy composites showed a dramatic increase of specific surface area (149.82 m2·g−1) and adsorption capacity (230.97 mg·g−1) when compared with the pure PPy nanoparticles. Based on the thermodynamics study and X-ray photoelectron spectroscopy analyses, the removal process of Cr(VI) was proved to be exothermic and spontaneous, and accessible under-coordinated Mo(IV) and pyrrolic N groups coupled with redox reactions were conducive to the efficient removal of Cr(VI). Attractively, the MoS2@PPy acted as the electron donor could also activate peroxymonosulphate for the efficient degradation of organic contaminants. These results suggested that the MoS2@PPy was promising in Cr(VI) elimination and other kinds of organic pollutants removal in wastewater.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 31
·20251-20258
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IF 4.036
Ying Yang,Jianbo Yin,Fangsheng Tao,Yunshan Zhou,Lijuan Zhang,Yuxu Zhong,Yong'an Wang
By combining the anionic salt meso-tetra(4-carboxyphenyl)porphyrin (TCPP4−) and the Keggin polyoxometalate cation cluster [Al13O4(OH)24(H2O)12]7+ via a simple ion-exchange method, a hybrid (C48H26N4O8)[Al13O4(OH)24(H2O)12]2(OH)10·18H2O (Al13–TCPP) was prepared and thoroughly characterized as a prototype of polyoxometalate–porphyrin hybrids for the photocatalytic degradation of the mustard gas simulant 2-chloroethyl ethyl sulfide (CEES). The experimental results showed that the catalytic degradation rate of CEES in the presence of Al13–TCPP reached 96.16 and 99.01% in 180 and 90 min in methanol and methanol–water solvent mixture (v/v = 1 : 1), respectively. The reaction followed first-order reaction kinetics, and the half-life and kinetic constant in methanol and solvent mixture were 39.8 min, −0.017 min−1 and 14.7 min, −0.047 min−1. Mechanism analysis indicated that under visible light irradiation in air, CEES was degraded through a combination of oxidation and alcoholysis/hydrolysis in methanol and the methanol–water solvent mixture. The superoxide radical (O2˙−) and singlet molecular oxygen (1O2) generated by Al13–TCPP selectively oxidized CEES into a non-toxic sulfoxide. The singlet oxygen capture experiments showed that Al13–TCPP (Φ = 0.236) had a higher quantum yield of singlet oxygen generation than H4TCPP (Φ = 0.135) under visible light irradiation in air. The material Al13–TCPP has good reusability, and the degradation rate of CEES can still reach 98.37% after being recycled five times.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Rui Wang,Hong You,Yingjie Zhang,Zhipeng Li,Yi Ding,Qiqing Qin,Han Wang,Jinxu Sun,Yuhong Jia,Feng Liu,Jun Ma,Xiquan Cheng
Electrically conductive membrane, acting as an electrode while separating, has already been demonstrated breakthrough performance in mitigating membrane fouling and improving contaminant removal. However, only a few works have reported about conductive ceramic membranes because of their poor conductivity. Herein, we developed a kind of highly conductive polypyrrole (PPy) coated ceramic membrane (CM) with excellent anti-fouling performance through incorporating graphene oxide (GO)/reduced graphene oxide (rGO). During the process, π-π interactions, hydrogen bond or electrostatic attractions occur between GO/rGO and pyrrole (Py), leading to the adsorption of Py onto the GO/rGO rather than polymerizing directly on membrane surface, which effectively improve the membrane properties such as flux, porosity, hydrophilicity, Zeta potential , and roughness, etc. Particularly, due to the formation of a complete conductive network between PPy and CM with GO/rGO, as well as high conductivity of rGO, the electrical resistivity of PPy membrane was decreased from 8.46 to 3.56 and 0.87 kΩ/cm, respectively. Interestingly, the average specific flux of rGO/PPy (GO/PPy) membrane under electric field was 47.5% (33.6%) higher than that of CM support during yeast filtration, showing strong promise in water remediation. In particular, the extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory proved that after introducing GO/rGO into PPy membrane, the enhanced hydrophilicity and Zeta potential, as well as the weakened roughness, led to more positive van der Waals, Lewis acid-base and electrostatic interfacial force, that was, better anti-fouling property, which indicated an extremely bright future in the design of anti-fouling membranes.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Tianxue Zhu,Lexin Liu,Jianying Huang,Shuhui Li,Yonggang Lei,Weilong Cai,Yuekun Lai,Huaqiong Li
Multifunctional flexible devices for human motion detection and thermal management raised great attention as the problem of the aging population is becoming more and more serious. However, it is still a challenge to endow the devices with excellent stability and wide application scope. Here we prepared a hydrophobic and conductive fabric-based strain sensor for smart fabric via successively coating with polydopamine (PDA), polyaniline (PANI), polypyrrole (PPy), and polydimethylsiloxane (PDMS) through in-situ polymerization and dip-coating, which could be used for strain sensor and wearable heater both in air and underwater. The obtained sample exhibited a fast electrical response in 500 ms and could withstand 10,000 times stretching-releasing cycles, additionally, the sample exhibited satisfactory electro-thermal and photo-thermal performances. As a whole, the multifunctional fabric-based devices with excellent performances show great potential to be applied in medical monitoring and personal care, especially for aged and disabled persons.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xianshuo Wei,Yaoting Xue,Ye Sun,Lian Chen,Chunmei Zhang,Qijun Wu,Shuyi Peng,Chunxin Ma,Zhenzhong Liu,Shaohua Jiang,Xuxu Yang,Seema Agarwal,Gaigai Duan
Intelligent hydrogels are promising for biomimetic actuators, but acquiring actuations with both high speed and powerful force is still extremely difficult. Herein, a new robust polypyrrole (PPy)-coated copoly(isopropylacrylamide-4-benzoylphenyl acrylate) [P(NIPAM-ABP)] electrospun light-responsive hydrogel is explored. The (PPy)-coated P(NIPAM-ABP) hydrogel can be obtained via in-situ polymerization of pyrroles on the nanofiber-oriented electrospun P(NIPAM-ABP) hydrogel. Compared with original P(NIPAM-ABP) hydrogel, this PPy-coated P(NIPAM-ABP) hydrogel can integrate highly-enhanced mechanical strength (from 1.21 to 5.12 MPa of tensile strength) and ultrahigh-efficiency of photothermal conversion together. In addition, the orientation of P(NIPAM-ABP) nanofibers can still maintain well for programmable complex deformations. Consequently, the as-prepared robust bi-hydrogel actuator with ultrafast and complex deformations has been achieved, through bonding the PPy-P(NIPAM-ABP) hydrogel membrane with a polyethylene glycol diacrylate-cellulose nanofiber (PEGDA-CNF) composite hydrogel membrane via interfacial ultraviolet (UV) polymerization of PEGDA monomers. Several light-responsive biomimetic actuating devices have been achieved, which owning powerful force (can grab up 100 times of self-weight), rapid speed (1285.71°/s of folding) or precisely programmable complex deformations. Furthermore, two biomimetic devices with synergistic functions of the three advantages above have been explored, which can mimic the child’s sit-up and the starfish’s continuous crawling movement respectively. This work provides a robust remotely-controlled light-responsive hydrogel actuator with powerful force, ultrafast speed and programmable complex actuations, which will inspire the design and fabrication of novel soft biomimetic actuating materials and systems.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Ming Zhang,Lei Shi,Xiling Du,Zhongrui Li,Yanhua Shi,Congcong An,Jian Li,Chengyu Wang,Junyou Shi
Directional transport of liquid is crucial for many applications including seawater desalination, oil/water separation, fog collection, membrane distillation and so forth. Particularly, Janus wood membranes, with asymmetric special wetting property on two sides, and mechanically robust bio-based substrate with ample pores and open nano-/micro-channels, present enticing opportunities to address this challenge. In this study, we report a Janus mesoporous wood-based membrane demonstrating the capabilities for simultaneous oil/water separation, aromatic dyes removal, and seawater desalination. Thanks to the inner driving force arising from the asymmetric special wettability, unique wood microchannels for the transpiration of trees, and the synergistic effect of PPy and Ag/AgCl NPs anchored to wood matrix, Janus mesoporous wood-based membrane would promote the desired transport without any external energy input for high-efficiency seawater desalination and switchable oil/water separation. Meanwhile, the aromatic dyes and other organic compounds in industrial wastewater or polluted seawater would get more opportunities to contact with the anchored Ag/AgCl NPs during flowing through the wood microchannels. Above advantages endow the Janus mesoporous wood-based membrane with excellent pollutant degradation efficiency (MB: 86.4 %, RhB : 91.9 %), high solar conversion efficiency (95.33 %), outstanding separation efficiency towards oil-in-water emulsion (∼99.51 %), remarkable oil adsorption capacity (∼8 times of its own weight), and great antibacterial efficiencies (E. coli: 99.87 %, S. aureus : 99.78 %, B. subtilis: 99.96 %). Results also show that this Janus mesoporous wood-based membrane has the satisfactory resistance to acid and base, robust mechanical structure, good recycling stability, high salinity tolerance and remarkable self-desalting capability. This study represents a new avenue for fabrication and design of Janus wood-based photothermal materials, and certainly will contribute to alleviating the global water and energy shortage issue.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-12
·
IF 6.408
Liao Linhong,Tong Simiao,Luo Xiaogang,Liu Genyan,Wu Fengshou
A new iron porphyrin-based organic polymer (Fe-POP) was synthesized through the William ether reaction. The as-prepared Fe-POP presented high chemical stability, wide pore distribution, high iron content, and strong affinity with 3,3’,5,5’-tetramethylbenzidine (TMB) and hydrogen peroxide (H 2 O 2 ), which contributed to its excellent peroxidase-mimicking performance. In the presence of H 2 O 2 , Fe-POP could catalyze the transparent TMB into blue ox-TMB, which could be easily distinguished by the naked eyes. Moreover, glutathione (GSH) and ascorbic acid (AA) could convert blue ox-TMB into colorless TMB due to the inhibitory effect of GSH/AA to the catalytic oxidation of TMB. Based on this phenomenon, a rapid and sensitive colorimetric method for the assay of H 2 O 2 , GSH, and AA was developed using Fe-POP as sensor. The detection limits of H 2 O 2 , GSH, and AA were 1.37, 0.44, and 0.33 μM, respectively. Finally, the colorimetric method based on Fe-POP was used to evaluate the GSH and AA content in real samples, which provided the guidance for GSH and AA supplements in our daily diet, suggesting the significant potential of Fe-POP in practical applications. Graphical abstract
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MATERIALS TECHNOLOGY
·
2022
·
IF 3.297
Yian Liu,Xu Ji,Huanyin Sun,Xiao Lin
Herein, we present the synthesis of PPy@MoO3 nanocomposites through a novel situ polymerisation growth. The introduction of polypyrrole (PPy) not only greatly improved the electrical conductivity of the material but also significantly improved the electrochemical activity, thus promoting the storage of energy reaction. The results exhibit that the electrode material has a very high specific capacitance (453.75 F/g at 1 A/g) and an excellent cycle life (84.3% of the initial specific capacitance after 5000 cycles). Notably, based on the rise of high-safety all-solid supercapacitors, it has great potential in the portable/wearable field. The PPy@MoO3//AC all-solid supercapacitors have the power density of 400 W/kg at an energy density of 20.3 Wh/kg. The distinguished performances stem from the synergetic merits of the morphology, structure, and mechanism of PPy@MoO3. PPy@MoO3 is expected to be a promising anode material and provide a theoretical basis for the scalable research and applications of MoO3-based anode materials for all-solid supercapacitors.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-9
·
IF 6.408
Wang Jiasheng,Zhang Decheng,Xu Keke,Hui Ni,Wang Dongwei
Dual-mode electrochemical aptasensor based on nitrogen-doped graphene (NG) doped with the conducting polymer polypyrrole (PPy) nanocomposite is proposed for the determination of acetamiprid. NG/PPy was electrodeposited onto the glassy carbon electrode (GCE) using cyclic voltammetry technique. NG/PPy/GCE showed outstanding electrocatalytic activity for the oxidation of nitrite due to “active region” induced by the charge redistribution of carbon atoms. The ultrasensitive dual-mode biosensor for acetamiprid could be easily developed by coupling acetamiprid aptamers with the NG/PPy hybrid. The specific binding between acetamiprid and the aptamers resulted in the increase of differential pulse voltammetry (DPV) signal change and the decrease of chronoamperometry (CA) signal, and the concentration of acetamiprid could be measured. The working potentials of DPV and CA were − 0.2 ~ 0.4 V and − 0.4 ~ 0.4 V (vs. SCE), respectively. The dual-mode acetamiprid biosensor showed a wide linear range from 10 −12 to 10 −7 g mL −1 , with low detection limits of 1.15 × 10 −13 g mL −1 and 7.32 × 10 −13 g mL −1 through DPV and CA modes, respectively. Moreover, owing to high active area and superior conductivity, as well as good electrocatalytic ability, the dual-sensing platform based on NG/PPy nanocomposite supported the quantification of acetamiprid in complex samples. Graphical abstract A dual-mode electrochemical aptasensor based on NG/PPy nanocomposite for acetamiprid detection was proposed through both the increase of differential pulse voltammetry (DPV) signal change and the decrease of chronoamperometry (CA) signal of the nitrite oxidation electrocatalyzed by NG/PPyn in sensors and biosensors.
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Journal of Energy Storage
·
2022
·
IF 8.907
Juguo Dai,Xiaohong Wang,Long Xia,Lili Luo,Dongxu Li,Chunying Yang,Yiting Xu,Lizong Dai
Undesirable energy density and storage ability hinder the pure carbon-based symmetric supercapacitor commercial application. Constructing hierarchical pore structure carbon material is expected to overcome this challenging issue. How to effectively reduce the multi-step and improve efficiency is worthy of in-depth study. Herein, a template-free strategy is proposed to construct N-doped hollow carbon sphere, combining a pore-forming agent and alkali treatment to build a hierarchical pore structure. Investigating the various pore structure contents in carbon spheres reveals its effect on the capacitive performance of as-prepared samples. From the robust walls structure (~50 nm) and rational micropores proportion (68.3 %), HCZK carbon sphere is equipped with a specific capacitance of 550.6 and 273.3 F g −1 in acidic and alkaline electrolyte , respectively, at a current density of 1 A g −1 . After 10,000 cycles charge/discharge test, the specific capacitance of HCZK sample does not lose in acidic electrolyte, and 4.1 % in alkali electrolyte. Symmetric supercapacitors assembled by HCZK carbon sphere deliver a specific capacitance of 247.1 F g − 1 at 1 A g −1 , outstanding coulombic efficiency of 100 % after 10,000 cycles and excellent energy density of 87.8 Wh kg − 1 at a power density of 1288.0 W kg − 1 . Achieve the above excellent properties can be attributed to the synergistic effect of rational pore structure and surface chemical composition. This work will reveal the contribution of micropores to the electrochemical of carbon materials and provide a reference for selecting electrolytes.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2022
·
IF 6.437
Bingbing Luo,Kai Wu,Jiajun Yu,Siyu Wang,Yihan Wang,Chenyang Chu,Huiyan Zhang
Catalytic pyrolysis of biomass for efficient N-heterocycles production is highly promising but extremely challenging. Herein, catalytic co-pyrolysis of glycerol and cellulose under ammonia atmosphere was proposed to enhance the N-heterocycles yield. First, a solvolysis effect of glycerol, which could improve the thermal depolymerization of cellulose, was observed in thermogravimetric analysis (TGA). After that, the major influential factors, including Si/Al ratio, reaction temperature, and glycerol-to-cellulose (Gly:Cel) ratio, were investigated systematically. The N-heterocycles yield, as well as the comprehensive synergies of feedstocks, reached their maximum value under the conditions of Si/Al = 85, 550 ℃, and Gly:Cel = 5:1. The best synergistic extents for pyrroles , pyridines, and indoles were 105.3%, 71.3%, and 38.8%, respectively. The mechanism insight showed that, the thermal decomposition of cellulose was promoted while the coking of oxygenated molecules was suppressed during the catalytic co-pyrolysis process. Consequently, more oxygenated molecules were generated and retained for further catalytic conversion into imine intermediates and N-heterocycles.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Yamin Pan,En Li,Yajie Wang,Chuntai Liu,Changyu Shen,Xianhu Liu
Solar-driven interfacial evaporation is considered to be one of the promising and efficient ways of producing clean water in recent years. However, it remains a challenge to develop solar evaporation devices with high solar evaporation rates and salt-free blocking properties. Here, a porous solar evaporator with directed water transport and salt-free desalination through excellent photothermal conversion and purposefully guided migration of the salt solution was developed. The designed porous photothermal sponge with the synergistic effect of MXene and polypyrrole can achieve evaporation rates of 1.47 and 2.27 kg m–2 h–1, respectively, in the capillary model and siphon model water-transporting solar evaporation devices. More interestingly, the designed zigzag-shaped device with an evaporation rate of 2.45 kg m–2 h–1 was achieved. In addition, the evaporator can operate stably under 9 h in the siphon model solar evaporation device and achieves the effect of salt-free desalination. The above design provides a good strategy for solar-powered desalination applications.
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