Membranes
·
2023
·Vol. 13
·期 9
·759
·
IF 4.2
Fanxin Kong,Lian You,Dingwen Zhang,Guangdong Sun,Jinfu Chen
Polysulfone (PSf) membranes typically have a negligible rejection of salts due to the intrinsic larger pore size and wide pore size distribution. In this work, a facile and scalable heat treatment was proposed to increase the salt rejection. The influence of heat treatment on the structure and performance of PSf membranes was systematically investigated. The average pore size decreased from 9.94 ± 5.5 nm for pristine membranes to 1.18 ± 0.19 nm with the increase in temperature to 50 °C, while the corresponding porosity decreased from 2.07% to 0.13%. Meanwhile, the thickness of the sponge structure decreased from 20.20 to 11.5 μm as the heat treatment temperature increased to 50 °C. The MWCO of PSf decreased from 290,000 Da to 120 Da, whereas the membrane pore size decreased from 5.5 to 0.19 nm. Correspondingly, the water flux decreased from 1545 to 27.24 L·m−2·h−1, while the rejection ratio increased from 3.1% to 74.0% for Na2SO4, from 1.3% to 48.2% for MgSO4, and from 0.6% to 23.8% for NaCl. Meanwhile, mechanism analysis indicated that the water evaporation in the membranes resulted in the shrinkage of the membrane pores and decrease in the average pore size, thus improving the separation performance. In addition, the desalting performance of the heat-treated membranes for real actual industrial wastewater was improved. This provides a facile and scalable route for PSf membrane applications for enhanced desalination.Keywords:PSf membrane;heat treatment;rejection performance
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongjun Wang,Jiafu Wang,Wentong Li,Zhe Li,Xiaoyu Zhang,Weitao Zheng,Tan Su,Jiaqi Zhang
The utilization of conductive hydrogels , particularly in the domain of wearable technology, has garnered substantial attention. However, the limited mechanical properties, low sensitivity, and lack of multifunctionality in conventional conductive hydrogels constrain their potential applications. Thus, the endeavor to develop conductive hydrogels with exceptional comprehensive performance remains a formidable challenge. In this investigation, chitosan quaternary ammonium salts and the conductive polymer poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) were employed as precursor materials, incorporating carboxylated cellulose nanofibers , to synthesize a novel double-crosslinked network hydrogel. The resulting hydrogel specimen exhibited noteworthy tensile strength (2.13 MPa), significantly enhanced elongation (547%), favorable strain sensitivity (Gauge Factor ranging from 0.91 to 9.78), and electrical self-healing capabilities. Additionally, it demonstrated accurate detection of subtle human movements and conversion of raw data into binary data. This research provides valuable insights into the advancement of conductive hydrogels for wearable soft electronics.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Hongwei Ren,Hongyu Dong,Tengda Zhao,Zhongqing Yan,Benzhen Jia,Liang Han,Jinfeng Zhang
Activated carbon (AC) is one of the typical adsorbents for industrial treatment of VOCs, but AC itself has a high calorific value. When the heat generated by low-temperature oxidation cannot be released, it is easy to store heat and oxidize spontaneously, resulting in immeasurable harm. Therefore, it is important to study and improve the thermal stability of AC. In this study, Mo-doped carbon quantum dots (CQDs) was synthesized to enhance the safety of AC usage. The structure of AC before and after modification was characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffractometer (XRD). On the modified Mo-doped CQDs/AC, there are more crystalline structures formed by Mo oxides on the surface, which makes the intermolecular force on the surface of AC increase. At the same time, Mo oxide has strong oxidation resistance, which can inhibit the thermal decomposition process of AC, and has stronger stability. The spontaneous combustion tendency and thermal hazard of AC before and after modification were greatly improved. The heat released in the toluene adsorption by the modified AC at different temperatures was significantly lower than the heat released by the unmodified AC. According to the Langmuir adsorption isotherm, the adsorption performance of Mo-doped CQDs (2.5 wt%) was 1.6 times higher than that of AC when the system was 25 °C. The results showed that Na 2 MoO 4 CQDs modified AC could effectively improve the thermal stability and greatly reduce the spontaneous combustion tendency. A relative fire safety performance evaluation model was also established to comprehensively evaluate the fire risk of VOCs treatment by AC.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fengsong Liu,Yan Zhang,Xinglong Xiao,Yifang Cao,Wenjuan Jiao,Hong Bai,Long Yu,Qingfei Duan
Growing global awareness of environmental issues has led to increased research interest in starch-based foams as a biodegradable packaging material. However, limitations such as low foaming ratio and poor water resistance hinder their development and industrial application. This study aimed to address these challenges by investigating the effect of the polyvinyl alcohol (PVA) content and hydrolysis degree on foam properties, providing insight into the intricate interplay between melt viscoelasticity and foam characteristics. The results demonstrated that the foaming behaviors, viscoelastic properties, thermal stabilities and mechanical performances of the foams were significantly improved with increasing hydrolysis degrees of PVA. These enhancements were attributed to hydrogen bonding interactions and intermolecular entanglements between starch and PVA chains. Additionally, the incorporation of PVA resulted in a remarkable reduction in the water absorption capacity (WAC) of the foams. Specifically, the foam containing 20% PVA with a hydrolysis degree of 98% exhibited the lowest WAC of 7.46% at 75% RH, the lowest bulk density of 12.42 kg/m 3 , the highest foaming ratio of 54.66, and the highest porosity of 99.39%. These properties were equivalent to those of commercially available expanded polystyrene (EPS). Furthermore, the addition of 20% PVA yielded the highest compressive strength of 110.58 MPa and the highest recovery of 92.75%, indicating great potential for diverse cushioning applications. Overall, this work highlights the significant potential for wider application of starch-based foams in large-scale industrial settings.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Rong-Shuai Hu,Li Yu,Sai-Ya Zhou,Hui-Fen Zhou,Hai-Tong Wan,Jie-Hong Yang
The natural deep eutectic solvent (NADES) was used as the extraction solvent to extract the four ingredients from Chuanxiong-Honghua. NADES-7 composed of L-proline and lactic acid (1:2) has a better extraction effect compared with traditional solvents. The extraction process was optimized using response surface methodology (RSM) and ant colony algorithm-enabled backpropagation neural network (ACO-BPNN), which were compared with each other. ACO-BPNN has a higher R 2 and predictive value than RSM. The optimal process parameters predicted by the ACO-BPNN were determined to be as follows: solvent-to-material ratio, 8 mL/g; extraction time, 67 min; water concentration, 48%; and extraction temperature, 50 °C. The best predicted comprehensive evaluation value was 4.2634, and the mean value obtained from the experiment was 3.8678. Compared with traditional solvents, the antioxidant activity of NADES-7 extract was better, and the mean value of DPPH, FRAP (ferric reducing antioxidant power), and ABTS assays were 0.1555, 0.1132, and 0.0894 mmol Trolox/g dry weight, respectively. Experimental results show that ACO-BPNN can better optimize the extraction process of many different polar compounds in plant combinations.
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Small
·
2023
·Vol. 19
·期 43
·2302526
·
IF 13.3
Shengdu Yang,Yushun He,Junwei Bai,Junhua Zhang
Photothermal hydrogels featuring broadband light absorption abilities and highly hydrated networks provide an appealing mass-energy transfer platform for water evaporation by using solar energy. However, the targeted delivery of solar heat energy to power the water evaporation process remains challenging. Herein, enlightened by metal-phenolic coordination chemistry and camouflaged architecture, photothermal hydrogels with dual-mechanism vaporization structure are tactfully designed via a rational interfacial engineering and integration strategy to enable near-µm heat confinement and highly efficient light-to-heat conversion ability. The spectrum-tailored liquid metal droplet (LMGAs-Fe III ) and optimized carbon-wrapped silver nanowire sponge (Ag@C 750 ) are integrally built as photothermal promotors/channels and jointly embedded into a highly hydratable poly(vinyl alcohol) hydrogel, denoted as PALGH, to synergistically boost water molecule activation and interfacial vaporization behavior by triggering robust photothermal performance. As a result, under one sun irradiation, the all-embracing PALGH hydrogel evaporation system achieves a brine evaporation rate to a high level of 3.47 kg m −2 h −1 , and >19 L m −2 clean water of PALGH is ideally delivered daily when purifying natural seawater. This work offers not only a rational design principle to create sophisticated photothermal materials but also replenishes insight into solar heat generation and water transportation in a cross-media system.
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Sustainability
·
2023
·Vol. 15
·期 13
·10113
·
IF 3.9
Guangchun Xu,Dongdong Yan,Wensheng Fang,Dejin Xu,Lu Xu,Qiuxia Wang,Aocheng Cao
We explore the effects of orange oil adjuvant (a kind of spray adjuvant) on the physicochemical properties of acetamiprid (pesticide) when foliage-applied to the surface of pittosporum tobira leaves. The leaf surface was characterized by the OCG (Van Oss–Chaudhury–Good) method, and the relationship between the wetting behavior of various pesticide droplets, including the change in surface free energy (SFE), adhesion force, and adhesion work, is explored to offer insight into the control of the pittosporum tobira psyllid,Edentatipsylla shanghaiensisLietChen. Results showed that SFE values for the adaxial and adaxial leaf surfaces were 40.13 mJ/m2and 37.06 mJ/m2, respectively, while acetamiprid liquids had SFE values of 67.43 mJ/m2and 63.26 mJ/m2. SFE values of the acetamiprid liquids are greater than that of the leaf surface, and the droplets on the leaves with a smaller adhesion force and lager adhesion work exhibited moderate-to-poor wettability estimated by contact angles. When the concentration of the orange oil adjuvant was between 0.10% and 1.00% above CMC (critical micellar concentration, 0.09%), the SFE values of the acetamiprid liquids were less than that of the leaf surface. The adhesion tension was greatly increased, and the adhesion work decreased by 14.46–28.13%. Meanwhile, droplets on the leaves exhibited good wettability. Field experiments showed that the synergistic effect of acetamiprid againstE. shanghaiensiswas significantly improved after spraying with orange oil adjuvant at the concentrations 0.10% and 1.0% above CMC. This study demonstrated the use of an orange oil adjuvant with a concentration above CMC to improve the synergistic effect of the insecticide directly through improved leaf wetting, which can provide reference for reducing pesticide dosage and increasing efficiency during the chemical control of pests.Keywords:adjuvant;surface tension;surface free energy;pittosporum tobira;Edentatipsylla shanghaiensisLietChen
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaolin Zhao,Fengjiao Li,Shuting Liang,Shuyuan Liu,Mingjuan Sun,Yanhui Cui,Bin Chi
Developing low-cost and effective catalysts for oxygen reduction reaction (ORR) and urea oxidation reaction (UOR) are highly desired in the urea-assisted Zn-air battery (UZAB) and urea splitting. Herein, a hollow spherical LaNiO 3 perovskite (LNO-H) was prepared by a hydrothermal method for ORR/UOR, UZAB and urea splitting. The LNO-H exhibited excellent performances for UOR in 1 M KOH with 0.33 M urea (E j10 = 1.41 V vs RHE) and ORR in 1 M KOH (E 1/2 = 0.80 V vs RHE). Moreover, the LNO-H-based UZAB showed a remarkable cycling stability over 2100 h (6300 cycles) at 2 mA cm −2 . In particular, the failure mechanisms of LNO-H-based UZAB were systematically investigated by analyzing the air cathode, Zn anode and the electrolyte. The failure of LNO-H-based UZAB at 2 mA cm −2 was mainly attributed to the formation of ZnO on the air electrode. Furthermore, K 2 CO 3 on the surfaces of air electrode via the reaction of OH − with CO 2 was the crucial factor for the battery failure at 10 mA cm −2 . Besides, LNO-H-based urea splitting required 1.42 V to achieve 10 mA cm −2 . This work may help to rationally design other multifunctional electrocatalysts, and achieve urea-based energy conversion in future.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bo-Cai Liu,Wei-Yan Xia,Shang-Qing Wang,Chang-Wei Xu,Zi-Li Liu
Spinel oxide NiCo 2 O 4 firstly has been explored to promote activity of Au for glycerol electrooxidation, which is supported on a three-dimensional hierarchical porous graphene-like carbon (3D HPG) material. Addition NiCo 2 O 4 into the Au/HPG catalyst can significantly improve the catalytic performance for glycerol oxidation. When NiCo 2 O 4 is added to the Au/HPG, onset potential is more 108 mV negatively than that on the Au/HPG. Peak current density on the Au/NiCo 2 O 4 (wt 6:1)/HPG is 5.1 times as high as that on the Au(20wt%)/HPG. The Au/NiCo 2 O 4 in this work shows a great potential as electrocatalyst for glycerol electrooxidation in alkaline medium.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Zhaoliang Jiang,Meng Ma,Xinpeng Wang,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
Incorporating bio-based flame retardants into polylactic acid (PLLA) to improve flame retardancy has always been the focus of research, but the improvement of flame retardancy is usually at the expense of mechanical properties. How to successfully balanced the material's mechanical and combustion properties has puzzled many scholars. Herein, ammonium polyphosphate (APP) and chitosan (CS) were used as acid source and carbon source respectively. Biological flame retardant APP@CS was designed and synthesized by electrostatic self-assembly method. In addition, toughened PLLA composites were prepared by reactive blending with the in-situ formed polyurethane (PU) as toughening phase. The results show that the CS shell not only reduces the hydrophilicity of the flame retardant, but also has good flame retardant property because of its excellent char forming property. The addition of 10 phr APP@CS can endow PLLA/crosslinked PU (CPU) with UL-94 V-2 rating and a LOI value of 24.9 %. Interestingly, CS shell participates in the in-situ reaction, which improves the mechanical properties of the composite with elongation at break of 74 %, which is higher than that of sample doped with the same amount of APP. This work provides guidance for the high performance modification of PLLA and is expected to expand the practical application range.
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Antioxidants
·
2023
·Vol. 12
·期 7
·1475
·
IF 7
Ding-Tao Wu,Wen Deng,Jie Li,Jin-Lei Geng,Yi-Chen Hu,Liang Zou,Yi Liu,Hong-Yan Liu,Ren-You Gan
Fruit thinning is a common practice employed to enhance the quality and yield of kiwifruits during the growing period, and about 30–50% of unripe kiwifruits will be thinned and discarded. In fact, these unripe kiwifruits are rich in nutrients and bioactive compounds. Nevertheless, the applications of thinned young kiwifruits and related bioactive compounds in the food and functional food industry are still limited. Therefore, to promote the potential applications of thinned young kiwifruits as value-added health products, the extraction, characterization, and evaluation of beneficial effects of phenolic compounds from thinned young fruits of red-fleshedActinidia chinensiscv ‘HY’ were examined in the present study. A green and efficient ultrasound-assisted deep eutectic solvent extraction (UADE) method for extracting phenolic compounds from thinned young kiwifruits was established. A maximum yield (105.37 ± 1.2 mg GAE/g DW) of total phenolics extracted from thinned young kiwifruits by UADE was obtained, which was significantly higher than those of conventional organic solvent extraction (CSE, about 14.51 ± 0.26 mg GAE/g DW) and ultrasound-assisted ethanol extraction (UAEE, about 43.85 ± 1.17 mg GAE/g DW). In addition, 29 compounds, e.g., gallic acid, chlorogenic acid, neochlorogenic acid, catechin, epicatechin, procyanidin B1, procyanidin B2, quercetin-3-rhamnoside, and quercetin-3-O-glucoside, were identified in the kiwifruit extract by UPLC-MS/MS. Furthermore, the contents of major phenolic compounds in different kiwifruit extracts prepared by conventional organic solvent extraction (EE), ultrasound-assisted ethanol extraction (UEE), and ultrasound-assisted deep eutectic solvent extraction (UDE) were compared by HPLC analysis. Results revealed that the content of major phenolics in UDE (about 15.067 mg/g DW) was significantly higher than that in EE (about 2.218 mg/g DW) and UEE (about 6.122 mg/g DW), suggesting that the UADE method was more efficient for extracting polyphenolics from thinned young kiwifruits. In addition, compared with EE and UEE, UDE exhibited much higher antioxidant and anti-inflammatory effects as well as inhibitory effects against α-glucosidase and pancreatic lipase, which were closely associated with its higher content of phenolic compounds. Collectively, the findings suggest that the UADE method can be applied as an efficient technique for the preparation of bioactive polyphenolics from thinned young kiwifruits, and the thinned young fruits of red-fleshedA. chinensiscv ‘HY’ have good potential to be developed and utilized as functional foods and nutraceuticals.Keywords:unripe kiwifruit;deep eutectic solvent;extraction optimization;polyphenolic;antioxidant activity;anti-inflammatory activity
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 36
·12222-12233
·
IF 6.4
Jincheng Liu,Po Ji,Zixun Wang,Xianglan Liu,Yongxing Lin,Xiangyang Li,Lin Chen,Xingyou Tian,Sihai Luo
Triboelectric nanogenerators (TENGs) are gaining tremendous attention as an environmentally friendly technology that converts low-frequency mechanical energy into electrical energy. However, the output of TENGs is limited by the tribolayer material used. In this study, a unique lamellar crystal triboelectric nanogenerator (LC-TENG) that uses polyamide-66 (PA66) lamellar crystal spin-coated films as positive triboelectric layers and FEP films as negative triboelectric layers is presented. The large vertical interlocking nanosheet structure on the PA66 spin-coating film, incubated in solution, improves surface roughness and promotes charge storage capacity. Under a constant force of 10 N and a frequency of 2 Hz, the LC-TENG with dimensions of 3 cm × 3 cm can achieve a peak voltage and current of 153 V and 7.35 μA, respectively. With an external load resistance of ∼11 MΩ, the TENG's maximum power density is 0.67 W m−2. The LC-TENG can easily harvest energy from human motions and light up a 36-LED array driven by a linear motor. Compared to TENGs using the initial smooth spin-coated film as the triboelectric electrode, the voltage and current from the lamellar structure film are 2.38 times and 2.17 times higher, respectively. This is the first time that a lamellar crystal structure has been introduced into friction material optimization, providing an efficient and feasible way to explore active sensor or electrode materials for self-powered electronic devices.
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危险品化学品经营许可证（带存储）