Nature Sustainability
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2024
·
IF 25.7
Zhang Gong,Li Binggong,Shi Yanfeng,Zhou Qi,Fu Wen-Jie,Zhou Gang,Ma Jun,Yin Shuo,Yuan Weihao,Miao Shiyu,Ji Qinghua,Qu Jiuhui,Liu Huijuan
Electrocatalytic nitrate reduction has great potential for simultaneously achieving ammonia recovery and nitrate-rich wastewater treatment. However, the complexity of wastewater matrices has long hampered its implementation and commercialization in the wastewater treatment industry. Here we develop a membrane-free electrochemical system, called electrochemical NO 3 − conversion synchronized with NH 3 recovery (ECSN), which synchronizes nitrate reduction with ammonia recovery for treating real nitrate-rich wastewater. Key components of this system include a 3D-printed metallic glass decorated Cu–Ni (MPCN) working electrode bearing good corrosion resistance and a UV-assisted stripping unit. When treating real electroplating wastewater, the ECSN system converts over 70% of nitrate into high-purity ammonia chloride. Long-term stability test demonstrates the robustness of the ECSN system in treating real wastewater. Further, the economic feasibility and environmental benefits of this system are evidenced by technoeconomic analysis and life-cycle analysis. Overall, this work brings the electrocatalytic nitrate reduction process one step closer to practical application, contributing to both environmental protection and the circularity of anthropogenic nitrogen flow.
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CHROMATOGRAPHIA
·
2011
·Vol. 73
·期 9
·865-870
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IF 1.075
Dai Xiaojun,Qian Xiaolei,Gong Bolin,Wei Yinmao
In this work, tetrazole-functionalized stationary phase was prepared with nitrile-modified silica by an ammonium-catalyzed (3 + 2) azide-nitrile cycloaddition reaction. The prepared stationary phase was used for separation of nucleobases and nucleosides by hydrophilic interaction chromatography (HILIC) mode. A typical HILIC mechanism was observed at higher content of acetonitrile (>85%, v / v ) in the mobile phase. The retention mechanism of the column was investigated by the models used for describing partitioning and surface adsorption through adjustment ratio of water in the mobile phase, and by the influence of salt concentration, buffer pH, and temperature on the retention of solutes. The results illustrated that the surface adsorption through hydrogen bonding dominated the retention behavior of nucleobases/nucleosides under HILIC mode. From the separation ability, the tetrazole-functionalized stationary phase could become a valuable alternative for the separation of the compounds concerned.
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MICROCHIMICA ACTA
·
2011
·Vol. 173
·期 1
·267-273
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IF 2.578
Wang Yang,Luo Xiaoyu,Tang Jie,Hu Xiaoya
A method is presented for matrix separation, preconcentration and determination by hydride generation atomic fluorescence spectrometry of trace amounts of Se(IV). It is based on solidified floating drops of 1-undecanol that are capable of extracting the target analyte after chelation with a water soluble ligand and subsequent ultrasound-assisted back-extraction into a aqueous solution. Hydride generation was then accomplished by reaction with a solution of sodium borohydride. Under optimized conditions, an enrichment factor of 15 and a linear calibration plot in the range from 0.01 to 5.0 μg L −1 were achieved using a 10.0 mL sample. The detection limit (3σ) is 7.0 ng L −1 , and the relative standard deviation (RSD) is 2.1% at 1.0 μg L −1 ( n = 11). The method was applied to determination of Se(IV) in different real water samples through recovery experiments and subsequently validated against two certified reference materials.
A solidified floating organic drop microextraction coupled with hydride generation atomic fluorescence spectrometry for the determination of Se(IV) is described.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2012
·Vol. 20
·期 2
·528-539
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IF 1.349
Wang Jiwen,Zhai Wentao,Zheng Wenge
The main purpose of this study is challenging to dramatically improve the toughness of poly(lactic acid) (PLA)/starch by adding poly (ethylene glycol) (PEG) into the composites and grafting PEG molecules onto the surface of starch particles. It was found that the surface grafting of PEG onto starch induced the presence of PEG-rich regions located around the starch particles, caused by migration and aggregation of free PEG molecules. A novel interphase transition layer between PLA and starch was formed, which showed great ability for cavitation and vested large-scaled plastic deformation to PLA matrix. Further mechanical properties tests indicated the formation of interphase layer significantly increase the elongation at break from 10.2 to 254.5%, and notched impact strength from 1.56 to 2.37 kJ/m 2 for PLA/PEG/starch ternary composites. The influence of PEG component, ethanol extraction and annealing was also investigated.
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COLLOID AND POLYMER SCIENCE
·
2010
·Vol. 289
·期 5
·677-684
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IF 2.057
Sun Xinke,Jiang Guohua,Wang Yin,Xu Yunzhu
Multi-arm star amphiphilic hyperbranched copolymers with poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) shell and hyperbranched poly(3-ethyl-3-(hydroxymethyl)oxetane) (HBPO) core were synthesized by reversible addition–fragmentation chain transfer method. The hyperbranched copolymers were further modified by succinic anhydride (SUC) to obtain the novel pH- and thermosensitive hyperbranched copolymer HBPO- star -PDMAEMAs-SUC. The composition and morphology of synthesized copolymers were investigated by 1 H NMR, dynamic light scattering, and transmission electron microscopy. These copolymers exhibited phase transitions in response to pH and temperature. The pH-dependent release properties of the drug-loaded micelles were also investigated using indomethacin (IND) as a model drug. The IND-loaded micelles displayed a rapid drug release at an alkaline pH.
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JOURNAL OF POLYMER RESEARCH
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2025
·Vol. 32
·期 2
·1-11
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IF 2.8
Yan Zhixiang,Liu Chenyao,Zheng Shuo,Tan Zhiyong
With the growing demand for miniaturized and flexible electronic devices, exploring polymer-based materials with high dielectric properties will play a crucial role in high-energy–density capacitors. In this study, a polyurethane material (PU-S x ) with excellent tensile and dielectric properties was prepared by introducing the aromatic disulfide 2,2'-Diaminodiphenyl disulphide (DTDA). The effect of DTDA content on the dielectric and mechanical properties of PU-S x was investigated. In the frequency range of 10 2 Hz to 10 6 Hz, PU-S x exhibits a high dielectric constant (> 8.29) and low dielectric loss (< 0.014). With the increase in DTDA content, PU-S x did not form a conductive network, resulting in a conductivity of only 5.35 × 10 –10 S·m at a frequency of 10 –1 Hz. The presence of two benzene rings and disulfide bonds (S–S) in DTDA significantly enhanced the tensile strength and elongation at break of PU-S x . The results indicate that, although the disulfide bonds in DTDA are inherently nonpolar, their strong interaction with the hard segments enhances the aggregation tendency of these hard segments, thereby promoting microphase separation to some extent, which leads to an increase in the dielectric constant.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-17
·
IF 5.3
Liang Jintao,Liang Jianlu,Xiao Xinkai,Guo Fei,Zhan Yulian,Zhou Xueqing,Zhou Zhide,Li Guiyin
A sandwich-type electrochemical aptasensor for ultrasensitive detection of glypican-3 (GPC3) was constructed using GPC3 aptamer (GPC3 Apt ) labelled reduced graphene oxide-cerium oxide-gold nanoparticles (RGO-CeO 2 -Au NPs) as the signal probe and the same GPC3 Apt as the capture probe. The electrochemical redox properties of CeO 2 (Ce 3+ /Ce 4+ ) in the RGO-CeO 2 -Au NPs indicate the electrochemical signals. When the target GPC3 was present, an “aptamer-protein-aptamer” sandwich structure was formed on the sensing interface due to the specific binding between the protein and aptamers, resulting in an increased electrochemical redox signal detected by differential pulse voltammetry (DPV) technique. Under optimal conditions, the established aptasensor exhibited a logarithmic linear relationship between the current response and GPC3 concentration in the range 0.001–100.0 ng/mL, with a minimum detection limit of 0.74 pg/mL. Using the spike-recovery tests for measurement of the human serum samples, the recovery was from 99.26 to 114.01%, and the RSD range was 3.04 to 5.34%. Furthermore, the sandwich-type electrochemical aptasensor exhibited excellent performance characteristics such as good stability, high specificity, and high sensitivity, demonstrating effective detection of GPC3 in human serum samples and can be used as a clinical detection tool for GPC3. Graphical Abstract
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JOURNAL OF NANOBIOTECHNOLOGY
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2025
·Vol. 23
·期 1
·1-21
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IF 12.6
Wang Qiuyang,Feng Kai,Wan Guangsheng,Liao Wei,Jin Jing,Wang Peng,Sun Xiaolian,Wang Weijun,Jiang Qing
RNA interference (RNAi) and oxidative stress inhibition therapeutic strategies have been extensively utilized in the treatment of osteoarthritis (OA), the most prevalent degenerative joint disease. However, the synergistic effects of these approaches on attenuating OA progression remain largely unexplored. In this study, matrix metalloproteinase-13 siRNA (siMMP-13) was incorporated onto polyethylenimine (PEI)-polyethylene glycol (PEG) modified Fe3O4 nanoparticles, forming a nucleic acid nanocarrier termed si-Fe NPs. Subsequently, a poly(vinyl alcohol) (PVA) crosslinked phenylboronic acid (PBA)-modified hyaluronic acid (HA) hydrogel (HPP) was used to encapsulate the si-Fe NPs, resulting in a bifunctional hydrogel (si-Fe-HPP) with reactive oxygen species (ROS)-responsive and RNAi therapeutic properties. Studies in vitro demonstrated that si-Fe-HPP exhibited excellent biocompatibility, anti-inflammatory effects and prolonged stable retention time in knee joint. Intra-articular injection of si-Fe-HPP significantly attenuated cartilage degradation in mice with destabilization of the medial meniscus (DMM)-induced OA. The si-Fe-HPP treatment not only notably alleviated synovitis, osteophyte formation and subchondral bone sclerosis, but also markedly improved physical activity and reduced pain in DMM-induced OA mice. This study reveals that si-Fe-HPP, with its ROS-responsive and RNAi abilities, can significantly protect chondrocytes and attenuate OA progression, providing novel insights and directions for the development of therapeutic materials for OA treatment.Graphical
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JOURNAL OF ELECTRONIC MATERIALS
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2024
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IF 2.2
Hou Guangya,Wu Yitao,Chen Qiang,Zhang Jianli,Tang Yiping
Constructing low-cost, high-catalytic-performance anode electrocatalysts is a significant challenge for methanol oxidation (MOR) and urea oxidation (UOR) reactions. Using paper templates with abundant pores to prepare thin porous metal materials helps to obtain high-performance electrode materials. The nano amorphous B-doped Ni/crystalline Ni (nanoam Ni-B/Ni) foil composite electrodes were derived from paper templates prepared by impregnation, high-temperature reduction, and electrodeposition methods. Porous Ni foils (Nip) derived thinnest rice (“Xuan”) paper, initially used for Chinese calligraphy and painting, exhibits the best performance due to its strong adsorption and wettability. Compared to direct current electrodeposition, pulse electrodeposition yields finer amorphous B-doped Ni nanoparticles with good catalytic performance. Under a current density of 100 mA·cm −2 , the nanoam Ni-B/Ni composite electrode prepared under a duty cycle of 0.5–1.0 s achieved current densities of 290.4 mA·cm −2 (MOR) and 340.4 mA·cm −2 (UOR) at 0.8 V, which are improved by 37.1% and 55.1%, respectively, compared to those of Nip. After 2000 cycles, with solution replacement, the current densities maintained 99.2% (MOR) and 81.6% (UOR) of the original values, showing excellent electrocatalytic stability. This research provided a new use for Chinese rice paper, and the prepared Nip-based electrode, with a thickness of about 60 μm and a low area quality, had a simple preparation process and good electrochemical properties, and can be used as a potential substitute for commercial Ni foam for portable or small electrochemical devices. Graphical Abstract
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Yang Kang,Li Ming,Gao Tianqi,Xu Guoliang,Li Di,Zheng Yao,Li Qiang,Duan Jingjing
Industrial CO 2 electrolysis via electrochemical CO 2 reduction has achieved progress in alkaline solutions, while the same reaction in acidic solution remains challenging because of severe hydrogen evolution side reactions, acid corrosion, and low target product selectivity. Herein, an industrial acidic CO 2 electrolysis to pure HCOOH system is realized in a proton-exchange-membrane electrolyzer using an acid-tolerant Bi-based metal-organic framework guided by a Pourbaix diagram. Significantly, the Faradaic efficiency of HCOOH synthesis reaches 95.10% at a large current density of 400 mA/cm 2 with a high CO 2 single-pass conversion efficiency of 64.91%. Moreover, the proton-exchange-membrane device also achieves an industrial-level current density of 250 mA/cm 2 under a relatively low voltage of 3.5 V for up to 100 h with a Faradaic efficiency of 93.5% for HCOOH production, which corresponds to an energy consumption of 200.65 kWh/kmol, production rate of 12.1 mmol/m 2 /s, and an energy conversion efficiency of 38.2%. These results will greatly aid the contemporary research moving toward commercial implementation and success of CO 2 electrolysis technology.
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Journal of Food Measurement and Characterization
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2024
·
IF 2.9
Zhang Zhiqi,Li Lin,Wang Xinyang,Liu Liyan
Houttuynia cordata Thunb. (H.cordata) , as a traditional Chinese medicinal herb and food, has been used to treat various diseases because of rich content in flavonoids. Here, an ultra-high performance liquid chromatography with triple quadrupole tandem mass spectrometry (UPLC-TQ-MS/MS) method was proposed for the determination of flavonoids profiling in H.cordata . Single factor experiment and response surface methodology were used to optimize the pretreatment process of H.cordata samples. The optimal conditions were as follows: ultrasonic temperature: room temperature (25 °C); ultrasonic time: 5 min; solid-liquid ratio: 1:40 and concentration of ethanol: 60%. The method showed the good linearity ( r ≥ 0.9855), the satisfactory intra-day (RSD%≤10.94%) and inter-day precision (RSD% ≤ 11.2%) and low limit of quantification (< 0.01 µg/mL). The content of flavonoids in flowers and leaves was much higher than in roots and stems. The flavonoids in the leaves of H.cordata from Chongqing was the highest (9.22 mg/g), and that in the flowers of H.cordata from Hubei province was the highest (6.69 mg/g). In addition, the antioxidant activity of the extracts of H.cordata was evaluated using the scavenging effect of the extracts on five free radicals and the iron ion reducing ability. The best antioxidant activity was observed in scavenging DPPH free radicals with EC 50 value of 295.16 µg/mL. The scavenging of ABTS•+ free radicals and PTIO• free radicals was also effective with EC 50 values of 818.82 µg/mL and 685.43 685.43 µg/mL, respectively. Thus, this study will be helpful to the development and utilization of flavonoids from H.cordata in food and pharmaceutical industries.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-14
·
IF 3.9
Yue Qiulin,Liu Yongxuan,Li Fujia,Hong Tao,Guo Shousen,Cai Mengrui,Zhao Lin,Su Le,Zhang Song,Zhao Chen,Li Kunlun
Fucoidan is a fucose-rich sulfated polysaccharide that has gained attention owing to its various biological activities. In this study, fucoidan was isolated from Saccharina japonica using an enzyme-assisted method, and its antioxidant and anti-hepatocarcinoma effects were evaluated. The fucoidan was a 112.8 kDa polysaccharide comprising seven monosaccharides: fucose, xylose, glucuronic acid, rhamnose, glucose, mannose, and galactose. The main chain residues were (1 → 3)-α-L-Fuc p and (1 → 4)-α-L-Fuc p units with sulfate groups at the C-2/C-4 positions of the (1 → 3)-α-L-Fuc p residues. S. japonica fucoidans showed excellent antioxidant potency with values of 1.02 mg TE/g and 5.39 mg TE/g for the ABTS and FRAP assays, respectively. Additionally, they exerted antitumor efficacy and low systemic toxicity in H22 tumor-bearing mice, with a tumor inhibition rate of 42.93%. Furthermore, it significantly inhibited tumor angiogenesis and reduced pro-inflammatory cytokines levels (IL-1β, IL-6, and TNF-α). Our results suggest that fucoidan isolated from S. japonica possesses potent antioxidant and anticancer properties and may be used as a potential agent for hepatocellular carcinoma treatment.
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