Journal of Water Process Engineering
·
2022
·
IF 7.34
Weixing Wu,Genmin Zhu,Beifu Wang,Ting Qu,Ming Gao,Yuanlu Zhu,Jiangyi Yan,Guiliang Li,Hailong Zhang,Lihong Nie
With the rapid development of industry, the environmental pollution caused by various oily wastewaters is becoming more and more serious. Therefore, it is urgent to exploit an environmentally friendly, highly efficient, and convenient method to scavenge the residual oil in crude oil/water emulsions. It is found that Janus particles have great potential in the treatment of oily wastewater due to their high interfacial activity. In this study, recyclable Janus hollow silica micron particles (J-HSMPs), were successfully synthesized by the improved Pickering emulsion method. Amphiphilicity of J-HSMPs was characterized and confirmed by using scanning electron microscopy, Fourier transform infrared spectroscopy, zeta-potential and contact angle measurements. The interfacial activity was further investigated by observing the dispersion behavior of J-HSMPs at oil-water interface and measuring the interfacial tension. The experimental results showed that J-HSMPs had excellent oil removal capability and reusability. Separation efficiency of crude oil and diesel oil could obtain 95.31 % and 96.17 %, respectively. After five cycles of application, the oil removal efficiency still could get >90 %. Amphiphilic J-HSMPs could cause tiny oil droplets in the water phase to aggregate into millimeter-sized oil droplets and carry them to the surface of water under influence of buoyancy, which helped to easily separate the water phase and oil droplets wrapped by J-HSMPs using a sieve. We anticipate that the as-prepared J-HSMPs will have promising and broad application prospects in cleaning oil spills, removing oil from domestic oily wastewater and crude oil emulsions in the process of petroleum industry.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Ge Tang,Kuaqian Deng,Panyang Li,Jiali Huang,Fanglin Dao,Hao Jiang,Jing Wang,Jianfang Jiang
Carrier, immobilization method and conditions are the most important factors affecting the performance of immobilized lipase . In this study, [email protected] is successfully prepared via an improved hydrothermal method combined with ion condensation. Then, we creatively adopt one-pot method, combining electrostatic adsorption with chemical crosslinking , to prepare lipase-nanocatalyst with excellent performance under mild conditions. [email protected] and lipase-nanocatalyst are characterized by FTIR, SEM, HRTEM , CLSM, CD, etc, the optimal conditions are explored in detail too. Lipase-nanocatalyst is 189 nm, and the loading ratio of free lipase is up to 67.6%. Compared with free lipase, specific activity is increased by 2.9 times, and it also broadens toleration to pH, thermal, organic solvents . In addition, lipase-nanocatalyst exhibits high storage stability and reusability . The residual activity is approximately 92.3% after the 10th recycle, and the cumulative catalytic activity is 13.4 times than that of free lipase. Finally, lipase-nanocatalyst is used to synthesize ethyl levulinate, with a production ratio of 68.6% for the first recycle, and the total output of EL is 12.9 times than that of free lipase after ten cycles. Thus, our findings provide a foundation for lipase-nanocatalyst showing several attractive features, such as easy preparation, excellent catalytic activity, good stability and reusability.
研究领域:
生物技术
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催化
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纳米技术
·
酶学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jia-Hui Chen,Jia-Hui Lu,Xiao-Lu Pu,Li Chen,Yu-Zhong Wang
Flame retardancy and recyclability are two important issues in the research field of thermosets, particularly for epoxy resin (EP) with the biggest market share. It is of great importance, but rarely achievable, to integrate these properties simultaneously into EP. Herein, we report a facile way to prepare intrinsically flame-retardant epoxy vitrimers combining rapid recycling and multiple shape memory effects by introducing dynamic ester-linkages with catalytic transesterification activity into the crosslinking networks of EP. The flame-retardant epoxy vitrimers exhibited high T g (∼110.7 °C), desirable thermal stability and excellent flame retardancy with UL-94 V-0 rating, and high LOI of ∼34%. Also, the value of the peak heat release rate (PHRR) and the total heat release (THR) showed 63% and 32% reduction, respectively. Meanwhile, flame-retardant epoxy vitrimers showed high malleability that could be reprocessed in 15 min at 200 °C without sacrificing the mechanical properties and flame retardancy. Moreover, the dynamic transesterification network allowed flame-retardant EP to access multiple shape memory effect. The design of flame-retardant epoxy vitrimers provide a prime example to foster the cyclic utilization of flame-retardant thermosetting polymers.
研究领域:
材料科学
·
高分子化学
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消防安全工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Likun Han,Huan Liu,Jinjie Zhang,Jun Zhou,Tao Jiang
Constructing of plasmonic substrate with the capability of detecting nutritional food quality will soon be emerged as the frontier research directions with broad prospects in surface-enhanced Raman scattering (SERS) technology ascribed to an improvement of living standards. Herein, a novel TiO 2 framework with a shrubby morphology was successfully constructed on carbon cloth (CC) matrix to trigger significantly enhanced electromagnetic “hotspots” after dense Ag network with numerous sharp corners and edges was formed by a photo-induced reduction. Particularly, the structure-dependent optical performance was investigated for these as-prepared CC/TiO 2 /Ag hybrid substrates, screening out an optimal one with an enhancement factor of 6.38 × 10 7 . Regarding a prominent photocatalytic efficiency ascribed to the high electron-hole separation efficiency assisted by the CC matrix and Ag decoration, a recyclable SERS-based monitoring of quercetin (QR) was achieved in teas, demonstrating recovery values distributed from 88.9 % to 106.4 %. The strategy proposed here opened a new way to create high-density “hotspots” for multifunctional SERS substrates, which might play a crucial role in food quality monitoring applications.
研究领域:
材料科学
·
纳米技术
·
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yan Zhu,Dahu Yao,Xiping Gao,Jing Chen,Hui Wang,Tianyan You,Chang Lu,Xinchang Pang
Multimodal flexible sensors, consisting of multiple sensing units, can sense and recognize different external stimuli by outputting different types of response signals. However, the recovery and recycling of multimodal sensors are impeded by complex structures and the use of multiple materials. Here, a bimodal flexible sensor that can sense strain by resistance change and temperature by voltage change was constructed using poly(vinyl alcohol) hydrogel as a matrix and poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS) as a sensing material due to its conductivity and thermoelectric effect. The plasticity of hydrogels, along with the simplicity of the sensor’s components and structure, facilitates easy recovery and recycling. The incorporation of citric acid and ethylene glycol improved the mechanical properties, strain hysteresis, and antifreezing properties of the hydrogels. The sensor exhibits a remarkable response to strain, characterized by high sensitivity (gauge factor of 4.46), low detection limit (0.1%), fast response and recovery times, minimal hysteresis, and excellent stability. Temperature changes induced by hot air currents, hot objects, and light cause the sensor to exhibit high response sensitivity, fast response time, and good stability. Additionally, variations in ambient humidity and temperature minimally affect the sensor’s strain response, and temperature response remains unaffected by humidity changes. The recycled sensors are essentially unchanged for bimodal sensing of strain and temperature. Finally, bimodal sensors are applied to monitor body motion, and robots to sense external stimuli.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
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纳米技术
·
机器人学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Lei Wang,Yu Wang,Wenxuan Li,Wenjing Zhi,Yuanyuan Liu,Liang Ni,Yun Wang
Going beyond organic solvent as the solubilizer for small-molecular organic probes motivates exploration of water-soluble polymeric sensors. In this respect, dye-derived thermal-responsive polymeric sensors are an attractive direction, but for its practical application, it is limited by sensor recycling because only irreversible change in the structure of the recognition unit for many sensors can trigger the appearance of the detection signal. Here, we established the oligonucleotide-derived thermal-responsive polymeric sensor, TBC-P1, which overcame this fundamental limitation. The TBC-P1 sensor was based on reversible binding between oligonucleotides and Hg2+ ions, and easy sensor separation via tuning temperature, achieving the Hg2+ detection in a cost-effective and green manner. The TBC-P1 sensor displayed specific and rapid sensing properties toward Hg2+ ions in pure aqueous media via turn-off fluorescence emission, with a limit of detection as low as 0.65 nM (much lower than the presently reported dye-derived polymeric sensors). This high detection sensitivity was further enhanced (with LOD = 0.17 nM) via warming to yield spherical micelles, in which the oligonucleotide-containing thermoresponsive PNIPAM block forming a hydrophobic core amplified the fluorescence signals. Treating the Hg2+-trapped micelles with cysteine (Cys) led to competition-induced release of these combined Hg2+ ions and then thermally precipitating and recycling polymeric sensor TBC-P1. This oligonucleotide-derived thermalresponsive polymeric sensor will open a universal avenue for sensor recycling, which will achieve the goal of reducing cost and improving detection sensitivity of sensors.
研究领域:
材料科学
·
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·
IF 4.7
Yang Ge,Wu Hao,Huang Ke,Ma Yukun,Chen Qi,Chen Yun,Lin Shanshan,Guo Hailing,Li Zhibo
The recycling of polyethylene terephthalate (PET) waste plastics has garnered global attention as an essential area of research to address. Chemical upcycling methods, such as glycolysis, offers a visible solution by directly converting PET wastes into high-valued monomers, enabling their reintegration into the plastic life cycle. However, the recovery of metal salt catalyst and the thermal stability of organic catalyst pose challenges in PET glycolysis. Zeolites with strong Brønsted acid are widely used in the degradation of polyolefins, but in PET glycolysis, they face the problems of acid site mismatch and difficult contact with PET. In this work, nanosized FAU-type zeolite catalysts (100-FAU) were employed to carry out PET glycolysis, which were green synthesized at low temperature without organic template. In comparison to commercial FAU-type catalysts, 100-FAU exhibits enhanced Lewis acidity and basicity along with increased accessibility to active sites. The 100% degradation of PET was achieved within 1 h, resulting in a BHET yield of 64.2%. Prolonging the reaction time to 1.5 h led to an enhanced BHET yield of 72.1%. The quality of the primary product bis(2-hydroxyethyl) terephthalate (BHET) was verified through IR, DSC, and NMR characterizations. Furthermore, as a solid catalyst with high thermal stability, zeolite can be easily recovered via filtration and demonstrated stable performance over at least 5 cycles, and proved effective for glycolysis of commercially waste PET plastics. The acid–base dual-functional catalytic mechanism of Na-form FAU in PET glycolysis was proposed. Under its guidance, the promoting effect of other Na-form nanosized zeolites on PET degradation was verified.
研究领域:
材料科学
·
化学工程
·
环境科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Shaofeng Liang,Muqun Wang,Wei Gao,Hailin Diao,Jianju Luo
It is well known that UV radiation can cause human health problems and that energy consumption can lead to human survival problems. Here, we prepared a composite membrane that can block UV radiation as well as reduce energy consumption. Carbon dots (CDs) and acrylates were prepared from xylose and epoxidized soybean oil as biomass feedstocks, respectively, and the composite membrane was prepared by a self-assembly strategy. The first layer of the membrane is composed of CDs and epoxy resin. Its main function is not only to weaken UV rays and the aggregation-induced quenching effect of CDs but also to reduce the absorption of UV rays by the second layer of the membrane. The second layer consists of barium sulfate (BaSO4) and acrylate. Compared to TiO2 (3.2 eV), BaSO4 (∼6 eV) has a higher electronic band gap, which reduces the absorption of UV light by the membrane. The composite membrane exhibits excellent UV-blocking and radiative cooling performance, shielding 99% of UV rays. In addition, the membrane can reduce 4.4 °C in radiative cooling tests, achieving a good cooling effect. Finally, the recyclability of the BaSO4/acrylate membrane is discussed, and 95% recovery rate provides sustainable utilization of the membrane. The composite membrane is expected to be popularized and used in low latitudes and areas with high temperature and high UV radiation near the equator.
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Qi Jiang,Jian Huang,Baoguo Ma,Zhengcai Yang,Ting Zhang,Xin Wang
TiO 2 @SiO 2 composite microspheres (TS) were prepared by the deposition of TiO 2 on the raspberry-like SiO 2 @polystyrene microspheres (PSS). The hollow microspheres with hierarchical microtopography possess both improved photocatalytic activity and stabilized TiO 2 particle structure. The results of energy dispersion spectrum (EDS) mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) showed that after calcination, anatase TiO 2 nanoparticles has formed on the raspberry-like PSS template with preferred deposition among interstitials of the drupelet-like structure. The thermal degradation of the polystyrene (PS) core during calcination led to the hollow microspheres. The photocatalytic experiments indicated that the raspberry-like TiO 2 @SiO 2 composite microspheres (TS1-TS3) had higher photocatalytic efficiency than the smooth ones (TS0), due to the hierarchical and hollow structure. The sample TS2 prepared with a moderate ammonia concentration (3 %) not only had relatively more intact hollow spherical structure, but also enhanced photocatalytic activity. The hollow TiO 2 @SiO 2 composite microspheres (TS3) prepared with 4 % ammonia showed the best photocatalytic efficiency. However, the higher ammonia concentration made the drupelet-like structure unstable and the microspheres tend to disintegrate. The raspberry-like microstructure showed a protective effect on the loaded TiO 2 , which resulted in better recyclability with persistent photocatalytic activity. The hierarchical composite microspheres shed light on the potential effective utilization strategy of nano-photocatalyst.
研究领域:
材料科学
·
化学
·
纳米技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 23
·2201643
·
IF 15.153
Xing Peng Hao,Chuan Wei Zhang,Xin Ning Zhang,Li Xin Hou,Jian Hu,Michael D. Dickey,Qiang Zheng,Zi Liang Wu
Recent years have witnessed the rapid development of sustainable materials. Along this line, developing biodegradable or recyclable soft electronics is challenging yet important due to their versatile applications in biomedical devices, soft robots, and wearables. Although some degradable bulk hydrogels are directly used as the soft electronics, the sensing performances are usually limited due to the absence of distributed conducting circuits. Here, sustainable hydrogel-based soft electronics (HSE) are reported that integrate sensing elements and patterned liquid metal (LM) in the gelatin–alginate hybrid hydrogel. The biopolymer hydrogel is transparent, robust, resilient, and recyclable. The HSE is multifunctional; it can sense strain, temperature, heart rate (electrocardiogram), and pH. The strain sensing is sufficiently sensitive to detect a human pulse. In addition, the device serves as a model system for iontophoretic drug delivery by using patterned LM as the soft conductor and electrode. Noncontact detection of nearby objects is also achieved based on electrostatic-field-induced voltage. The LM and biopolymer hydrogel are healable, recyclable, and degradable, favoring sustainable applications and reconstruction of the device with new functions. Such HSE with multiple functions and favorable attributes should open opportunities in next-generation electronic skins and hydrogel machines.
研究领域:
材料科学
·
生物医学工程
·
软体机器人
·
可穿戴技术
·
可持续材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Jizhong Wu,Waqas Ahmad,Wenya Wei,Xiafei Xu,Tianhui Jiao,Qin Ouyang,Quansheng Chen
The widespread applications of sulfur dioxide and its derivatives is a double-edged sword in terms of ensuring environmental and food safety. In this work, a recyclable flexible upconversion-luminescence sensor was developed for the determination of sulfite in environmental and foodstuff samples. The upconversion nanoparticles (UCNPs) were uniformly doped with polydimethylsiloxane (PDMS) prepolymer and moulded to prepare a flexible upconversion-luminescence substrate, which was further modified with pararosaniline (PRA) dye based on the typical carbodiimide coupling procedure. The principle of the work was based on the inner filter effect (IFE) mechanism between PRA dye and UCNPs. In the presence of target sulfite ions, it selectively binds to PRA moieties fixed on the surface of the flexible sensor, resulting in its bleaching and restoration of the upconversion fluorescence. Under the optimized conditions, a linear response for sulfite concentration in the range of 10–100 nM was obtained. The limit of detection was calculated as 2.24 nM, and the proposed sensor was successfully regenerated and recycled six times. The method was applied in real rainwater samples with spiked recoveries in the range of 94.85%–99.39%, and the coefficient of variation ranged from 1.65% to 4.93%. Hence, the proposed flexible upconversion-luminescence sensor held the attractive potential for efficient sulfite determination in real environmental and food samples.
研究领域:
环境科学
·
分析化学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaogang Guo,Taotao Liang,Meizi Tian,Ankamfio Julius Tetteh,Plabon Sorker,Jiacheng Wang,Meng Li
The general lack of water resources makes the treatment of oily wastewater as an urgent concern, which causes catastrophic damage to ecosystems and environment. Construction of a universal oil/water separator is not an easy task, because the reported processes are relatively complex and it is difficult to achieve industrial large-scale production. To overcome this problem, herein, using the low-cost and frequently-used metal (stainless steel, etc.) meshes as raw materials, two kinds of oil/water separators with different moving models have firstly designed via a universal technique of a facile chemical etching and fluoridation coating process . The newly synthesized superhydrophobic/superoilphilic stainless steel or copper mesh with surface morphology , high purity and structure stability displayed an excellent anti-wetting property (high water contact angle of >157°) after a series of tests of immersion, droplet rolling-off, anti-impacting process, 30days exposure aging in open-air, etc. In addition, experimental results revealed that the fresh and aging separators can maintain excellent oily wastewater remediation efficiency up to ∼99% even after 25 separation cycles, making them economical and commercially viable. This study provides a novel perspective for advancement in designing oil/water separator with low cost, less energy consumption and high efficiency for universal application.
研究领域:
环境工程
·
材料科学
·
水处理
·
废水管理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）