Environmental Science-Nano
·
2023
·Vol. 10
·期 5
·1284-1296
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IF 7.3
Yuxuan Lin,Weihua Qin,Yuwei Lu,Mingye Ren,Pan Gao,Feng Xiao,Shaoxia Yang
Improving the performance of single-atom catalysts (SACs) is still challenging in Fenton-like reactions for degrading refractory organic pollutants. Here, we designed P and N co-doped Fe SACs to regulate the electronic structure of Fe active sites and enhance the reaction kinetics of peroxymonosulfate (PMS) activation. The obtained heteroatom-doped Fe SACs for the first time exhibited an ultra-low activation energy (ca. 3.7 kJ mol−1) and excellent degradation efficiency for bisphenol A (BPA) in a wide pH range (4.3–9.2). The superior reaction kinetics of the Fe SACs were attributed to enriching the electron density of atomic Fe and then forming dual electron-rich/-deficient sites, which accelerated the electron transformation to generate reactive oxygen species (ROS). In this study the heteroatom-doped Fe SACs with rapid reaction kinetics are achieved, and provides an idea to design SACs with superior performance in heterogeneous Fenton-like reactions.
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PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Gaojian Lin,Tengfei Fu,Yinan Qiu,Fei Li,Weifu Sun
The protection performance of polyurea (PUA) coating is limited due to its intrinsic flammability . In order to develop a PUA composite coating with outstanding flame retardant and anti-impact performance simultaneously, in this paper the modified ammonium polyphosphate (MAPP) and two-dimensional (2D) nanofillers of graphene oxide (GO) and Mg-Al layered double hydroxides (LDH) were introduced into PUA matrix. Thermal stability and combustion behavior of PUA composites were studied by thermogravimetric analyzer and cone calorimeter. Results show that PUA composite sample with 17 wt% MAPP, 1.5 wt% GO and 1.5 wt% LDH exhibited remarkable flame-retardant and fire protective performance. The flame retardancy index increases to 1.7 from 1.0 with the time required to burn out and total heat release THR being dramatically decreased by 31.0 % and 33.4 %, respectively. The dynamic mechanical properties of PUA composites at the strain rate as high as 4500 s −1 were investigated. The dynamic mechanical behavior of the PUA composite shows strong strain rate effect . The introduction of the flame retardant does not substantially damage the energy dissipating capacity and anti-impact performance of the PUA matrix. Interfacial properties of PUA composites were studied by standard avulse and shear methods. The PUA composites with LDH and GO could form stronger bonding with the steel compared to neat PUA.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Mohammad Ziaur Rahman,Xin Wang,Lei Song,Yuan Hu
Rising concerns about the toxic effects and environmental issues associated with various fireproof treatments on textiles have led to a demand for “green” materials. Chitosan (CS) is an amino polysaccharide green, recyclable, and non-toxic highly biocompatible biopolymer that consists of multiple hydroxyl groups and has a wide range of applications, including as a flame retardant additive. In this study, an eco-friendly bio-based formaldehyde-free flame retardant containing a higher level of phosphorus and nitrogen in phytic acid ammonia (PAA) was synthesized to amplify the most plentiful green chitosan (CS)-modified polyamide 66 (PA66) fabric surface through a simple pad-dry-cure technique for the improvement of durable flame retardancy with hydrophilicity . The findings revealed that each UV-grafted CS fabric could entirely stop the melt-dripping tendency during the vertical burning (UL-94) test and reached a V -1 rating. Meanwhile, limiting oxygen index (LOI) testing showed a rapid increase from 18.5 % to 24 % for the PA66 control and the PAA-treated (i.e., PA66-g-5CS-PAA) fabric samples, respectively. Moreover, compared to the PA66 control sample, a dramatic decrease in the peak heat release rate (PHRR), fire growth rate (FGR), and total heat release (THR) by approximately over 52 %, 0.63 %, and 19.7 %, respectively, was observed for the PA66-g-5CS-PAA fabric sample. Additionally, this arrangement of PAA catalyzed the charring of grafted CS and acted as a condensed phase flame retardant, resulting in a significant improvement in char yield% in both air and N 2 atmospheres for the PA66-g-5CS-PAA fabric sample in TGA . In addition, only the lower grafting ratio of CS with PAA-treated fabric sample (i.e., PA66-g-2CS-PAA) could encourage it to gain its lowest water contact angle of 0 0 , as well as impersonating a positive effect in improving the flame retardant coating durability in washing and sustaining even after 10 home laundering cycles. This phenomenon suggests that an actual hydrophilic and durable flame retardant finishing procedure for polyamide 66 fabrics might be applied with the novel, plentiful, sustainable, and environmentally friendly bio-based green PAA ingredient.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
·
IF 8.7
Weiyi Xing,Jianchao Xi,Wei Cai,Weijie Zhang,Bangyu Wang,Liang Chen,Yuan Hu
Although leather can be functionally modified well, its origin will cause concern about the destruction of the ecological environment. Here, a novel multifunctional synthetic leather (denoted as FRTL) that integrates high tensile strength , flame retardancy, Joule heating, electromagnetic shielding, and strain sensing is reported. Benefiting from the excellent mechanical properties of the PU film, the leather exhibits a high tensile strength of 100.8 MPa. Based on the high conductivity of MXene , the leather possesses an electromagnetic shielding efficiency of 30.1 dB. FRTL also exhibits excellent flame retardancy, confirmed by the reduction of more than 32% in peak heat release rate. In addition, the controlled Joule heating properties enable the leather to cope with extreme cold weather. The obtained fabric can also detect various human movements. This work provides a facile method to fabricate the next-generation multifunctional protective leather, showing promising application in the field of smart firefighting.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Yaoxia Yang,Xuqin An,Dangxia Wang,Fengyao Guo,Lan Zhang,Xingwei Guo,Dongfei Sun,Xiaozhong Zhou,Zhiwang Yang,Ziqiang Lei
Transition metal phosphide has recently become a research hotspot of electrocatalysis because of its low price and excellent performance. Furthermore, nonmetal heteroatom incorporation into materials is a good way to regulate the surface electronic structure of electrocatalysts to boost their electrocatalytic performance. Based on this, the molybdenum phosphide (MoP) nanoparticles were firstly anchored on nitrogen-doped the porous carbon (NC) substrate by a simple annealing process, and then doped with nonmetal heteroatom selenium (Se) by hydrothermal method . By adjusting the content of selenium, x Se-doped MoP/NC nanoparticle electrocatalysts were successfully synthesized. Among them, the 0.25 Se-MoP/NC electrocatalyst exhibited the best HER catalytic performance, which presented a low overpotential of 141 and 166 mV at 10 mA cm −2 in a 1.0 M KOH and 0.5 M H 2 SO 4 and Tafel slope of 69.91 and 62.93 mV dec −1 for HER, respectively. Benefiting from the doping of selenium, the electronic structure and surface composition of MoP can be effectively regulated, which is conducive to expose abundant active sites and enhance the inherent activity of MoP. Additionally, the N-doped porous carbon substrate also facilitates the diffusion of electrolyte/bubbles and good charge/mass-transfer ability. Furthermore, the electrocatalyst had good stability both in an acidic and alkaline media. This work provides an idea for the synthesis of nonmetal doped-transition metal phosphide as HER electrocatalyst with high efficiency and stability.
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Journal of Water Process Engineering
·
2023
·
IF 7
Renjuan Liu,Qiyue Wan,Yinghao Yu,Xu Zhang,Longcheng Liu,Hai Wang,Chengtao Yue
The development and application of new high-efficiency adsorbent materials for efficient removal of uranium (VI) from nuclear wastewater is of great concern for environment protection. In this study, a novel phosphate-rich macroporous carbon foam was designed and synthesized for efficient uranium (VI) adsorption. Bath adsorption was used to evaluate the uranium (VI) adsorption performance of this carbon foam, and the influences of adsorbent dosage, solution pH and ionic strength on adsorption efficiency were studied. The results demonstrated that the carbon foam was effective adsorbent for uranium (VI) and the adsorption efficiency reached 99 % at 30 °C, pH 7.0 and contact time 2.0 h with an adsorbent dosage of 0.25 g L −1 in 100 mg L −1 uranium (VI) solution. The adsorption process follows better with pseudo-second-order model with a coefficient of correlation of 0.9999 and was more consistent with the Langmuir model with the maximum adsorption capacity as high as 1250 mg g −1 . The distribution coefficient of carbon foam for uranium (VI) reached 15 L g −1 which is higher than that for other ions (0.1–4.4 L g −1 ), demonstrating a good adsorption selectivity. Moreover, this material can be recycled for at least 5 times and can be used in fixed-bed adsorption column for dynamic adsorption of uranium from uranium-containing solutions (5 or 50 mg L −1 ) with adsorption efficiencies up to 99 %. This study's results showed the high efficiency of phosphate-rich macroporous carbon foam in uranium (VI) adsorption and highlighted its great potential in efficient removal of uranium (VI) from nuclear wastewater.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3709-3722
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IF 4.5
Mu Wenxiao,Liang Weidong,Wang Yanqing,Sun Hanxue,Zhu Zhaoqi,Li Jiyan
Improving solar energy conversion efficiency and salt resistance is particularly important for the practical application of green and sustainable solar steam generation technology. In this work, an interfacial evaporation polypyrrole-coated film was fabricated by the mixed-dimensional clay consisting of 1D palygorskite (Pal), 2D montmorillonite (Mt) and mica, etc., that was intercalated using polyaniline (PANI) and then introduced polyvinyl pyrrolidone (PVP) as pore-forming agent and polyvinylidene fluoride (PVDF) as a base film. The prepared film could efficiently convert light energy to heat under solar irradiation with excellent properties of self-desalination and photothermal conversion efficiency as well as superhydrophilicity and low thermal conductivity. The photothermal conversion efficiency achieved up to 93.6% under the simulated sunlight of 1 kW m −2 . The evaporation rate in 15% NaCl brine differed very little from that in pure water, and 0.2 g of NaCl placed on the film would be eliminated in short time at room temperature, which demonstrated that the film had salt resistance and self-cleaning capability. In addition, the resulting film had low thermal conductivity (0.09994 W m −1 K −1 ) and good mechanical properties (tensile strength of 1.1 MPa) and exhibited superhydrophilicity (water contact angle ~ 0°) which could transport water molecules rapidly.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Gang Qin,Yongcun Liu,Wenye Zhang,Wenjie He,Xiaoxiang Su,Qianqian Lv,Xiang Yu,Qiang Chen,Jia Yang
Flexible supercapacitors have attracted more and more attention because of their promising applications in wearable electronics, however, it is still important to harmonize their mechanical and electrochemical properties for practical applications. In the present work, a seamless transition between polyaniline (PANI) electrode and NH 4 VO 3 _FeSO 4 dual redox-mediated gel polymer electrolyte (GPE) is presented through in situ formation of gradient interface structure. Multiple physical interactions make the GPE excellent mechanical and self-healing properties. Meanwhile, double role functions of Fe 2+ ions greatly relieve the traditional contradiction between mechanical and electrochemical properties of GPE . Moreover, benefiting from the structure and reversible redox reactions of VO 3- and Fe 2+ , the integrated supercapacitor delivers an exceptional specific capacitance of 441.8 mF/cm 2 , a high energy density of 63.1 μWh/cm 2 , remarkable cyclic stability. Simultaneously, the gradient structure from PANI electrode to GPE greatly improves the electrode/electrolyte interface compatibility and ion transport, which endows the supercapacitor with stable electrochemical performance. Furthermore, the supercapacitor well-maintains the specific capacitance even at −20 °C with over 89.19 % retention after 6 cutting/healing cycles. The gradient interface structure design will promote the development of high-performance supercapacitor.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 3
·1200-1213
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IF 4.5
He Chunming,Yan Ru,Xue Qingwang,Li Shuxian,Wang Huaisheng
In this work, polyaniline (PANI) and overoxidized polyaniline (oPANI) nanorods doped by phytic acid (PA) with uniform size of 60–100 nm were prepared and modified on glassy carbon electrode (GCE) as non-enzymatic malathion sensors. Doping of PA has deep influence on structural and morphological properties, conductivity and detection performance of electrode materials. The obtained PANI nanorods doped with PA (PA-PANI) possess high affinity toward malathion, and thus the redox reaction of PANI molecules could be hindered and redox currents were inhibited. The electrode reaction process on PA-PANI/GCE is a typical adsorption-controlled process. By contrast, the oPANI nanorods doped with PA (PA-oPANI) presents good catalytic performance to malathion and the electron transfer process was enhanced and redox currents increased. Correspondingly, the electrochemical reduction process on PA-oPANI/GCE is a typical diffusion-controlled process. Both enzyme-free electrochemical sensors exhibit good stability, anti-interference ability, recovery in real samples and excellent detection performance, with a wide linear range of 0.01–200 ppb and low detection limit (1.58 ppt for PA-PANI and 2.23 ppt for PA-oPANI, respectively), indicating that PA-PANI and PA-oPANI could be used as an excellent malathion sensor. Moreover, the PA-oPANI sensor has some degree of reproducibility through further anodic polarity processing, and the detailed application needs to be further explored.
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Materials
·
2022
·Vol. 16
·期 1
·286
·
IF 3.748
Bingying Cheng,Qingqing Zhou,Jiayi Chen,Xu Zhang,Chenglei Zhu,Minghao Wu
The vinyl phytic acid (GPA) was prepared using biophytic acid (PA) and glycidyl methacrylate (GMA), in which double bonds were introduced into the phytic acid molecule to increase the active groups in the phytic acid molecule. Furthermore, itaconic acid (IA) containing two unsaturated double bonds and GPA was polymerized in situ and crosslinked on the surface of cotton fabrics, and flame retardant and crease-proofed fabrics were obtained. The effects of GPA, IA, and the initiator on the flame-retardant and crease-proofing properties of the fabrics were analyzed by a single-factor and double-dip double-nip experiment. A flame-retardant and wrinkle-resistant fabric was obtained when the limiting oxygen index (LOI) and wrinkle recovery angle (WRA) were 28% and 270°, respectively. During combustion, the thermal properties of the fabrics changed; typically, the extrapolated initial temperature (Te) decreased, and moisture release increased. After burning, the fabrics had good shape retention, and the carbon residue content increased to 48%, which effectively inhibited or slowed down the combustion and heat release of the textiles. However, the whiteness, mechanical properties, and washability of the products need to be further improved.Keywords:flame-retardant and crease-proofing finishing;phytic acid;cotton textiles
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yang Huang,Xuening Song,Jun Deng,Chenyang Zha,Wenjing Huang,Yunling Wu,Yanguang Li
Transition metal phosphides are arguably the most promising non-precious metal-based materials for hydrogen evolution reaction (HER). Unfortunately, their high preparation temperature usually results in particle sintering. It is challenging to achieve the ultra-dispersion of transition metal phosphide nanoparticles on conductive supports so as to enlarge their surface areas and reinforce their physical stability. In this study, we prepare fine MoP nanoparticles uniformly dispersed on hierarchical carbonaceous scaffolds by using strongly interacting Mo, P and C precursors. The resultant hybrid product possesses a three-dimensional open structure that allows a large fraction of MoP nanoparticles electrochemically accessible and suppresses their possible agglomeration during extended electrocatalysis. Electrochemical measurements show that the product has an impressive HER activity, only requiring an overpotential of 120 and 170 mV to achieve 10 mA/cm 2 in 0.5 M H 2 SO 4 and 1M KOH, respectively, as well as great cycling stability. Its performance can be further promoted via the controlled sulfur doping at surface to form molybdenum phosphosulfide, which reduces the overpotential at j = 10 mA/cm 2 to 92 mV and 158 mV for acidic and alkaline HER.
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SYNTHETIC METALS
·
2019
·
IF 2.87
Xingliang Chen,Kailiang Zhong,Tao Shi,Xinlei Meng,Guanglei Wu,Yun Lu
Uniform urchin-like polyaniline/magnetic carbon sphere (PANI/p-C/NiFe 2 O 4 ) hybrid with superior electromagnetic wave absorption properties was successfully fabricated, and its morphologies and structures were investigated via SEM, XPS, XRD and FT-IR. Due to the fairly good matching of dielectric loss and magnetic loss, the PANI/p-C/NiFe 2 O 4 hybrid sample with thickness of 2.5 mm showed a minimum reflection loss value up to −37 dB in the frequency range of 2–18 GHz, the effective absorption band width of 3.9 GHz, and the excellent electromagnetic wave absorption property both in absorption efficiency and effective absorption band.
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危险品化学品经营许可证（带存储）