APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Yi Liao,Shan-Shan Chai,Wei-Bin Zhang,Yao Yao,Jing-Lei Yang,Yi Yin,Jia-Jun Li,Ze-Qin Yang,Xue-Jing Ma,Qiang Peng
Clay minerals, naturally occurring two-dimensional layered nanomaterials, hold significant interest in electrochemical energy storage. However, their practical use is hindered by the pronounced stacking and aggregation of layers. Here, we selected eight clay minerals of kaolinite, halloysite, montmorillonite, vermiculite, palygorskite, sepiolite, talc and chlorite, employed a simple chemical water bath method to insert diamine molecules with different chain lengths between the layers of these minerals. This approach aimed to prevent stacking and aggregation while allowing controlled expansion of the layer spacing. Subsequently, the montmorillonite (M) with relatively high specific capacitance were selected for further discussion. X-ray diffraction results show that the layer spacings of diamine ( x DM, x = 2–6) modified montmorillonite (M/ x DM) could be optimized within 1.189 nm and 1.455 nm, of which the butanediamine (4DM) pillared montmorillonite composites (M/4DM) exhibited the most suitable layer spacing of 1.362 nm for efficient Na 2 SO 4 ion transportation. Additionally, the CeO 2 loaded montmorillonite (CeO 2 -M) composites were further prepared by the same method to obtain diamine pillared CeO 2 loaded montmorillonite (CeO 2 -M/ x DM). The specific capacitance of CeO 2 loaded and butanediamine pillared montmorillonite composites (CeO 2 -M/4DM) was 573.9 F g −1 , which was 33.9% higher than the counterpart without modification (CeO 2 -M). The assembled supercapacitor CeO 2 -M/4DM//AC exhibited almost no loss in capacitance after 10,000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Tianding Hu,Qingming Jia,Shanchuan He,Shaoyun Shan,Hongying Su,Yunfei Zhi,Lei He
Developing high-performance materials for removal of antibiotics has attracted ever-increasing concerns since variety of harmful antibiotics have been frequently detected in aquatic environments and posed a serious threat to both human health and ecosystems in recent years. In this work, a novel adsorbent (ED-MIL-101) for oxytetracycline antibiotic (OTC) was prepared by grafting ethylenediamine (ED) to Lewis acidic open metal sites in porous metal-organic framework MIL-101. The successful grafting was corroborated via FT-IR spectrum. Compared with the pristine MIL-101, ED-MIL-101 demonstrated a slight decrease in BET surface areas and pore sizes, while the basic frameworks remain invariant. Results for kinetics and thermodynamics showed that the aminofunctionalized adsorbent exhibited a predominant superiority over nongrafted MIL-101 and activated carbon (AC) on the removal of OTC, even though the specific surface area decreased remarkably after grafting. Moreover, ED-MIL-101 can be regenerated by simple washing with ethanol and reusable up to at least the third run with little change in adsorption capacity . Evidence from zeta potential showed that the adsorption of OTC was also driven by electrostatic interaction between the OTC and ED-MIL-101. These results indicate that ED-MIL-101 has great potential in removing OTC contaminant from water.
研究领域:
环境科学
·
材料科学
·
污染控制化学
·
吸附技术
·
水处理工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Yaoge Huang,Zhuqing Wang
A novel Ethylenediamine-Modified Calcium Alginate Aerogel (ECAA) was synthesized by freeze-drying method, and used to remove Pb 2+ and Cu 2+ from aqueous solutions. The prepared adsorbent was characterized by using the FTIR spectra, SEM analysis and XPS analysis . The effects of the pH, initial metal ion concentration, adsorption kinetics , and isotherms had been studied systematically. Moreover, the ECAA can be regenerated by simple acid treatment and used repeatedly. It is interesting to note that almost no Ca 2+ can be detected after the first cycle that confirmed the adsorption process involves ion exchange.The XPS spectra analyses further indicated that Pb 2+ and Cu 2+ were adsorbed via the chelation of −CO-NH, −NH 2 and −OH. The results from these studies indicated the aerogel is a promising adsorbent to separate and recover the heavy metal ions from contaminated water.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 5
·2842-2850
·
IF 3.108
Zhang Yun-fei,Halidan Maimaiti,Zhang Bo
Nanocrystalline cellulose (NCC) with a particle size of 23.80 ± 0.33 nm was prepared from microcrystalline cellulose by a mixed treatment with acids and ultrasound. The NCC was chlorinated with thionyl chloride, submitted to dehydrating carbonization and oxidization, and then modified with ethylenediamine (EDA) to obtain fluorescent carbon nanoparticles (NCC–EDA). These were characterized by elemental analysis, TEM, BET, FT-IR, XRD, TG-DTA, XPS, UV-Vis, and photoluminescence. It was found that NCC–EDA were vesicle-like porous particles formed through the linking and intertwining effects of EDA on the SOCl2-treated NCC. The surface of NCC–EDA is rich in oxygen-, nitrogen- and sulfur-containing functional groups, and the particle size was 41.45 ± 0.55 nm. This endows the NCC–EDA with good dispersity in water, high absorbance and strong fluorescence. The NCC–EDA are shown to be viable probes in that their fluorescence is selectively quenching by Pb(II). The findings were exploited to design a fluorometric assay for Pb(II) that has a 24 nM detection limit.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 18
·9803-9817
·
IF 6.123
Shen Liwei,Liu Tianqi,Huang Kecang,Zhang Dalei,Luo Xincai,Yang Ying,Feng Xuening,Zhang Zejun,Ye Fan,Mi Yuanzhu
A large number of stable oil-in-water (O/W) emulsions are generated by the petroleum industry each year, resulting in a series of operational and environmental challenges. In this study, a RH-NH 2 demulsifier was prepared for the separation of O/W emulsions by grafting ethylenediamine onto natural rice husk. RH-NH 2 was characterized using Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). When the dosage of RH-NH 2 was 50 mg/L, the light transmittance (W T ) and corresponding oil removal efficiency (W R ) of the separated water were 90.2 ± 1.8% and 94.82 ± 0.95%, respectively, in the emulsion-0.2 (containing 0.2% crude oil). When the dosage was 200 mg/L, the W T and W R values of the emulsion-1 (with 1% crude oil) were 91.9 ± 0.9% and 99.14 ± 0.1%, respectively. In addition, dynamic interfacial tension (IFT), wettability, zeta potential, interfacial activity and adsorption capability of RH-NH 2 at the interface were also investigated. The results showed that the IFT values of asphaltene and RH-NH 2 (200 mg/L) was 22.58 mN/m and 16.42 mN/m, respectively. The zeta potential of the O/W emulsion was − 37 ± 1.8 mV while that of RH-NH 2 was 20.8 ± 1.0 mV, which facilitated the electrostatic neutralization and reduced the electrostatic repulsion between oil droplets. A possible demulsification mechanism was proposed, which indicated that RH-NH 2 was amphiphilic, with high interfacial activity and stronger capability to reduce IFT. It migrated rapidly to the oil–water interface and disrupted the interfacial film via synergistic effect of the π-π/n-π interaction, leading to demulsification. RH-NH 2 has a potential industrial application due to its low-cost and high demulsification efficiency.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 15
·155505
·
IF 3.874
Shengliang Zheng,Jianyong Sun,Juanyuan Hao,Quan Sun,Peng Wan,Yue Li,Xin Zhou,Ye Yuan,Xu Zhang,You Wang
Ever-increasing concerns over air quality and the newly emerged internet of things (IoT) for future environmental monitoring are stimulating the development of ultrasensitive room-temperature gas sensors, especially for nitrogen dioxide (NO2), one of the most harmful air pollution species released round-the-clock from power plants and vehicle exhausts. Herein, tin dioxide nanorods/ethylenediamine-modified reduced graphene oxide (SnO2/EDA-rGO) heterojunctions with selective adsorption and electronic structure modulation were engineered for highly sensitive and selective detection of NO2 at room temperature. The modified EDA groups not only enable selective adsorption to significantly enrich NO2 molecules around the interface but also realize a favorable modulation of SnO2/EDA-rGO electronic structure by increasing the Fermi level of rGO, through which the sensing performance of NO2 is synergistically enhanced. The response of the SnO2/EDA-rGO sensor toward 1 ppm NO2 reaches 282%, which exceeds the corresponding SnO2/rGO sensor by a factor of 2.8. It also exhibits a low detection limit down to 100 ppb, enhanced selectivity, and rapid response/recovery kinetics. This approach to designing a novel heterojunction with significantly enhanced chemical and electric effects may shed light on the future engineering of gas-sensing materials.
研究领域:
材料科学
·
环境科学
·
化学传感器
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-12
·
IF 4.122
Yue Rui,Chen Qiumeng,Li Siqi,Zhang Xiaodan,Huang Yuming,Feng Ping
Here, we reported a novel one-step hydrothermal route for the facile synthesis of 1,6-hexanediamine functionalized magnetic chitosan microspheres (AF-MCTS), which were characterized by TEM, FT-IR and XPS to look into its morphology, surface functional groups, and adsorption mechanism of Cr(VI) from the aqueous solution. Cr(VI) adsorption on AF-MCTS as a function of contact time, Cr(VI) concentration, pH, and ionic strength was investigated. The adsorption process follows the Langmuir isotherm model and pseudo-second-order kinetic model. The AF-MCTS exhibited high performance for Cr(VI) removal with very fast adsorption rate (reaching equilibrium within 5 min) and high adsorption capacity (208.33 mg/g), which was 1.1 to 12 times that of other chitosan-based adsorbents. Cr(VI) adsorption onto AF-MCTS was an endothermic and spontaneous process. The recovery and reuse of AF-MCTS was demonstrated 11 times without obvious decrease in adsorption capacity. Mechanism study suggested that –OH rather than –NH 2 groups in AF-MCTS were the electron donors for reducing Cr(VI) to Cr 3+ . Consumption or addition of H + could trigger the reversible supramolecular coordination between Cr 3+ and chitosan. Given the easy preparation, low cost, and remarkable performance, AF-MCTS composite is expected to show promising potential for the practical application in removing toxic Cr(VI) from aqueous media.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2020
·Vol. 13
·期 5
·1025
·
IF 3.057
Songhan Wan,Xiaobin Lu,Hongguo Zhao,Songbo Chen,Shuwei Cai,Xianru He,Rui Zhang
Graphene oxide (GO) was modified by p-phenylenediamine (PPD), aiming at improving the wet-skid resistance and reduce the rolling loss of solution polymerized styrene-butadiene rubber (SSBR). PPD with amino groups enabled GO to obtain anti-aging function. The structure of modified GO (PPD-GO) was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy. Mechanical tests showed that the mechanical properties of SSBR before and after aging were improved by adding PPD-GO. The results of thermogravimetric-differential scanning calorimeter synchronization analysis (TGA-DSC) indicated that SSBR/PPD-GO obtained good thermo-oxidative stability. The dynamic mechanical analysis (DMA) of SSBR composites showed that the mechanical loss factor (tanδ) peak moved to high temperature with the content of PPD-GO. The tanδ values of SSBR composites showed that it had a good effect on improving the wet-skid resistance and reducing the rolling loss of SSBR by adjusting the content of PPD-GO. In particular, with the addition of 4 phr GO, SSBR was effectively improved in mechanical properties, aging resistance, wet-skid resistance and low rolling loss.Keywords:p-phenylenediamine (PPD);graphene oxide (GO);solution polymerized styrene-butadiene rubber (SSBR);aging resistance;rolling loss;wet-skid resistance
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wen He,Qianxiang Xiao,Haiyan Jiang,Zhenglemei Qiu,Ziyang Chang,Feng He,Qixu Chen,Xiangke Wang,Hongqing Wang
Enhanced bulk-surface charges separation and migration are essential to maximize the photocatalytic activity. In this study, ethylenediamine (EDA)-modified Zn 0.7 Cd 0.3 S nanorods (ZCS-NR-EDA) were synthesized through an integral modification approach. After 1-hour adsorption equilibrium followed by 6-minute co-irradiation with visible light and ultrasonic waves, ZCS-NR-EDA removed 99.2 % of U(VI) from the solution, significantly better than Zn 0.7 Cd 0.3 S nanoparticles (ZCS-NP) (13.6 %) and Zn 0.7 Cd 0.3 S nanorods (ZCS-NR) (25.3 %). This catalytic performance has outperformed most reported materials. Experimental and density functional theory (DFT) calculation studies confirmed that EDA modification induced polarization to establish a bulk electric field (BEF) and modified the electron distribution at the material's surface to create localized surface electric field (LSEF), while simultaneously enhancing the material's piezoelectric properties. The synergistic effect of these triple electric fields (polarization-induced BEF, LSEF, and piezoelectric field (PF)) promoted migration of bulk-surface charges, thereby enhancing catalytic performance. When applied to uranium spiked tailing water, ZCS-NR-EDA achieved up to 98.1 % U(VI) removal within 15 min of combined visible light and ultrasonic irradiation (after adsorption equilibrium). More importantly, this “tri-electric fields synergy” strategy provides a novel approach for the design of advanced photocatalytic materials.
研究领域:
环境科学
·
材料科学
·
核化学
·
光催化
·
纳米技术
·
物理化学
✓ 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）