DESALINATION
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2013
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IF 3.041
Xinwang Cao,Meiling Huang,Bin Ding,Jianyong Yu,Gang Sun
Conventional ultrafiltration (UF) or nanofiltration (NF) filters for water treatments are based on porous membranes, where the torturous porosity usually results in a relatively low flux rate , typically manufactured by the phase immersion method. Electrospun (ES) nanofibrous membranes with a high flux rate evoked a considerable interest in the ultrafiltration or nanofiltration applications, because of their high porosity, good interconnectivity and high specific surface area. Herein, we developed a novel double layers of polyacrylonitrile (PAN) electrospun nanofibrous membranes (with an average fiber diameter of 173 nm) reinforced with TEMPO (2, 2, 6, 6-tetramethylpiperidine-1-oxyl radical) selectively oxidized jute cellulose nanowhiskers (with a diameter in the range of 3–10 nm). From FE-SEM images, the presence of evenly coated thin layer of cellulose nanowhiskers on the PAN ES nanofibers is evident. The versatile PAN/cellulose ES composite membranes with superior mechanical properties and high filtration efficiency of 7–40 nm particles would be particularly useful for applications in the domestic drinking water and industrial waste water treatment.
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CARBOHYDRATE POLYMERS
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2015
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IF 4.074
Xiaran Miao,Jinyou Lin,Feng Tian,Xiuhong Li,Fenggang Bian,Jie Wang
Cotton stalk bark, as the byproduct of cotton plant, was usually discarded and/or combusted, leading to waste of resources and environment pollution. How to efficiently utilize this kind of cellulosic materials is of significative to energy saving and environment protection. Herein, we report on the extraction of cellulose nanofibrils (CNF) from the cotton stalk bark for the first time by a combination of TEMPO-oxidation and mechanical disintegration method. The obtained CNF showed a yield more than 20 wt%. The morphologies, crystalline structures and thermal properties of CNF were extensively investigated by the transmission electron microscopy, scanning electron microscopy, synchrotron radiation wide-angle X-ray scattering, Fourier transform infrared spectra and differential scanning calorimetry, respectively. The results showed that the final extracted CNF have similar polymorphs with their starting materials and a significantly increased crystallinity. This work will provide a new way to utilize the cotton stalk barks.
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CARBOHYDRATE POLYMERS
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2014
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IF 3.916
Qingyuan Niu,Kezheng Gao,Wenhui Wu
A cellulose nanofibril film is modified by chemical assembly of boronate-terminated conjugated polymer chains at its specific sites, C-6 carboxyl groups. The modified cellulose nanofibril film is used as a fluorescent sensor for nitroaromatic vapor. Thanks to the specific reactive sites, numerous loose cavities or pathways located in the film sensor's out-layer have been formed, and the fraction of easily accessible cavities of the novel fluorescent film sensor is up to 0.97, which could benefit the penetration and diffusion of analyte vapor. Therefore, the novel fluorescent film sensor exhibits high sensitivity toward nitroaromatic vapor with a fast response. The fluorescence quenching efficiency of the chemical-assembly film sensor is about 3 times larger than that of the spin-cast film sensor using the same conjugated polymer for 600 s exposure to DNT vapor. In addition, the novel fluorescent film sensor shows good reversibility.
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RSC Advances
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2013
·Vol. 3
·期 35
·15058-15064
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IF 2.562
Kezheng Gao,Ziqiang Shao,Xi Wang,Yunhua Zhang,Wenjun Wang,Feijun Wang
In recent years, much effort has been dedicated to achieve environmentally friendly, low cost, and excellent performance energy storage devices. In this work, cellulose nanofibers (CNFs)/multi-walled carbon nanotubes (MWCNTs) hybrid aerogels are prepared from CNFs/MWCNTs hydrogels by supercritical CO2 drying using CNFs as an effective, environmentally friendly, and steady dispersant of MWCNTs. All-solid-state flexible supercapacitors are fabricated using CNFs/MWCNTs hybrid aerogel film as the electrode material and charge collector. One-dimensional CNFs can effectively prevent the aggregation of MWCNTs, significantly enhance the re-wettability, and improve the utilization efficiency of the mesopores. Therefore, CNFs/MWCNTs hybrid aerogel film-based all-solid-state flexible supercapacitors exhibit excellent electrochemical properties: the specific capacitance is about 178 F g−1. The flexible supercapacitors also exhibit excellent cyclic stability. Our work provides a novel method using low cost, and environmentally friendly CNFs to realize the full potential of the MWCNTs in an assembled bulk form. Taking its low cost and environmentally friendliness, CNFs/MWCNTs hybrid aerogel has great potential as the electrode material for all-solid-state flexible supercapacitors.
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CARBOHYDRATE POLYMERS
·
2013
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IF 3.479
Yiming Zhou,Shiyu Fu,Liangliang Zhang,Huaiyu Zhan
Superabsorbents based on carboxylated cellulose nanofibrils (CCNFs) and carboxymethyl cellulose-g-poly(acrylic acid-co-acrylamide) were synthesized. A series of experiments were performed to evaluate the influence of factors such as CCNFs amount, solution pH, temperature, salt solution type and concentration on the swelling behaviors of the hydrogels. The water uptake of the hydrogels strongly depended on the CCNF content, the swelling capacity in distilled water increased dramatically from 245.8 to 458.7 g/g with the addition of CCNFs up to 2.5 wt%. Furthermore, the incorporation of CCNFs improved salt resistance properties of the hydrogels with slower deswelling rate and higher water retention capacity at deswelling equilibrium. Besides, the CCNF nanocomposite hydrogels presented better responsive behavior in relation to pH presence and showed an increase in water retention capacity at various temperatures. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were employed to examine the structure and morphologies of the prepared superabsorbent hydrogels.
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MOLECULAR PHARMACEUTICS
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2014
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IF 4.787
Huan Huang,Duanwen Cao,Linghao Qin,Shouqin Tian,Yang Liang,Shirong Pan,Min Feng
Numerous preclinical studies have demonstrated that polycation mediated gene delivery systems successfully achieved efficient gene transfer into cells and animal models. However, results of their clinical trials to date have been disappointing. That self-assembled gene and polycation systems should be stable undergoing dilution in the body is one of the prerequisites to ensuring efficiency of gene transfer in clinical trials, but it was neglected in most preclinical studies. In this account, we developed the dilution-stable PAMAM G1-grafted polyrotaxane (PPG1) supermolecules in which PAMAM G1-grafted α-cyclodextrins are threaded onto a PEG chain capped with hydrophobic adamantanamine. The PPG1/pDNA polyplex (approximate 100 nm in diameter) was very stable and kept its initial particle size and a uniform size distribution at ultrahigh dilution, whereas DNA/PEI 25K polyplex was above three times bigger at a 16-fold dilution than the initial size and their particle size distribution indicated multiple peaks mainly due to forming loose and noncompacted aggregates. PPG1 supermolecules showed significantly superior transfection efficiencies compared to either PEI 25K or Lipofectamine 2000 in most cell lines tested including normal cells (HEK293A) and cancer cells (Bel7402, HepG2, and HeLa). Furthermore, we found that the PPG1 supermolecules delivered DNA into HEK293A through a caveolae-dependent pathway but not a clathrin-dependent pathway as PEI 25K did. These findings raised the intriguing possibility that the caveolae-dependent pathway of PPG1 supermolecule/pDNA polyplex avoiding lysosomal degradation was attributed to their high transfection efficiency. The dilution-stable PPG1 supermolecule polyplex facilitating caveolae-dependent internalization has potential applications to surmount the challenges of high dilutions in the body and lysosomal degradation faced by most gene therapy clinical trials.
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CARBOHYDRATE POLYMERS
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2017
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IF 4.811
Xue Yang,Hui Liu,Fuyi Han,Shuai Jiang,Lifang Liu,Zhaopeng Xia
Cellulose nanocrystal (CNC) was extracted from Carex meyeriana Kunth (CMK) by a combination of TEMPO oxidation and mechanical homogenization method, and used to remove methylene blue (MB) from aqueous solution. After alkali-oxygen treatment, the aqueous biphasic system (polyethylene glycol/inorganic salt) was applied to further remove lignin from CMK. The characteriazation of CNC, and the effects of H 2 O 2 dosage, CNC dosage, adsorption time, and initial MB concentration on the MB removal capacity of CNC were investigated. The results showed that the removal percentage of MB by CNC was raised with the increase of H 2 O 2 and CNC dosage. The adsorption kinetics of prepared CNC followed the pseudo-second-order model, and the adsorption isotherms fitted well to the Langmuir model with a calculated maximum adsoption capacity of 217.4 mg/g, which was higher than those of CNC extracted by acid hydrolysis method, indicating CNC extracted from CMK had promising potentials in the field of MB adsorption.
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BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Jin Peng,Xianfeng Hou,Fang Zeng,Shuizhu Wu
Drug-induced organ damages have been considered as a grave problem regarding public health; hence effective method for in vivo detection of drug-induced organ damages is of great significance. Herein we developed a ratiometric fluorescent nanoprobe (NPs-A), which was prepared by loading the probe molecules into phospholipid bilayer, for assaying hydrogen peroxide (H 2 O 2 , an organ damage biomarker) level in vivo. The photophysical behavior of the probe molecule depends on the electron-withdrawing ability of the group at the 6- position of anthracene ring, on which the recognition moiety for hydrogen peroxide (dicarbonyl coupled with nitrophenyl, referred to as nitrophenyl-dicarbonyl) was introduced. Upon the reaction of the probe with H 2 O 2 , nitrophenyl-dicarbonyl group transforms into carboxyl group, and due to the variation of the electron-withdrawing ability of the 6th substituent , the fluorescent properties of the probe molecule alters accordingly, thus ensuring the ratiometric detection for H 2 O 2 with high selectivity with the detection limit of 0.49 μM. In addition, the nanoprobe (NPs-A) was applied for cell and in vivo imaging applications; and the results indicate that it can detect and track the level of H 2 O 2 in living cells and to monitor and spatially map endogenous H 2 O 2 levels in a drug-induced organ damage model of zebrafish.
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NEW JOURNAL OF CHEMISTRY
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2024
·
IF 2.7
Yu Gao,Siyu Liu,Xu Huang,Weiwen Lu,Jian Huang,Hua Zhang,Yong Zhang,Jinhua Wang,Shanshan Xi,Jun Liu,Tao Luo
Considering the difficulty in recovering powder materials and the low photocatalytic efficiency, we have developed a series of Fe-MOFs (MIL-53(Fe), NH2-MIL-53(Fe), MIL-101(Fe), NH2-MIL-101(Fe) and MIL-100(Fe)) on pure iron mesh. In this study, the growth of Fe@MILs on the iron mesh was confirmed through SEM, XRD, and FT-IR characterizations. Among the photocatalytic experiments, Fe@NH2-MIL-53(Fe) and Fe@NH2-MIL-101(Fe), which are amine-functionalized, showed improved photocatalytic activity. This improvement is believed to be due to the combination of NH2 functionality and electron transfer to the Fe-O cluster centre, resulting in dual excitation pathways. Furthermore, Fe@MIL-100(Fe) showed the highest performance for the removal of Cr(VI), with over 92% of Cr(VI) being removed in the fifth photocatalytic cycle. Mechanism indicated that the close connection between the compact structure of Fe-MOFs and effective electron migration. Additionally, sacrificial reagent experiments identified two important species for Cr(VI) reduction: electrons (e-) and superoxide radicals (O2-). The photocatalytic recovery tests showed a 97% recovery rate of Cr(VI). This work offers a novel solution for the treatment of water sources contaminated with Cr(VI).
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Shuhao Jiao,Xuefei Yang,Xuejing Zheng,Ying Pei,Jie Liu,Keyong Tang
The present work investigates the effects of nano-chitin with different charge, obtained by acid hydrolysis and TEMPO oxidation , on the structure and properties of borax crosslinked polyvinyl alcohol (PVA) hydrogels. In detail, nano-chitin prepared by acid hydrolysis (ACh) is positively charged (+28.8 mV). The electrostatic attraction between ACh and borax ions leads to a maximum tensile stress of composite hydrogel (ACh/PB), 54.25 KPa, 17 times of the borax crosslinked PVA (PB). In contrast, nano-chitin prepared by TEMPO-oxidation (TCh) shows negative charge (−59.0 mV). Due to the electrostatic repulsion with borax ions, the maximum tensile stress of composite hydrogel (TCh/PB) is only 9.25 KPa, a very limit reinforcing effect. However, TCh/PB showed better self-healing efficiency (96.0 %) as well as ionic conductivity (1.25 × 10 −5 S/m). The present work shows that the charge state of the nano-chitin exerts great influence on the interaction with the crosslinking agent borax, therefore, affects the structure and properties of the final PVA composite hydrogels. The results could provide important information about making full use of nano-chitin as a reinforcement by adjusting its surface charge state.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Mei Lin,Miao Wang,Jianwang Wu,Ming Liu,Zuliang Chen
Since the widespread use of antibiotics, the residues of antibiotics have frequently been detected in various water sources, making antibiotic pollution an urgent environmental issue. In this paper, one-step green synthetic reduced graphene/manganese nanoparticles (rGO/Mn NPs) composites have been utilized as a novel environmentally-friendly catalyst for tetracycline (TC) removal. The results demonstrated that rGO/Mn NPs exhibit excellent adsorption performance for TC, and can efficiently activate sodium persulfate (PDS) to oxidize and degrade TC. Furthermore, the rGO/Mn NPs adsorption-oxidation system (85.2%) was more effective than the adsorption process (70.9%) in removing TC (50 mg L −1 ). Free radical quenching experiments and EPR results elucidated that singlet oxygen ( 1 O 2 ) and superoxide radicals (·O 2 − ) are the primary reactive species responsible for the degradation of TC in the oxidation system. Based on the characterization results, a mechanism of oxidative degradation of TC by rGO/Mn NPs has been proposed. To further elucidate the degradation pathway of TC, the degradation products were identified by high performance liquid chromatography-mass spectrometry (HPLC-MS). This analysis provides a foundation for understanding how the rGO/Mn NPs composites activate PDS to degrade TC. Additionally, the ecological structure-activity relationship analysis revealed that TC is converted into intermediates with lower toxicity.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chuanyu Chen,Simeng Xia,Fan Chen,Ting Peng,Lin Deng,Huiying Wu,Zhou Shi
The Fe(II)/peracetic acid (PAA) process shows significant potential for the removal of organic pollutants due to the rapid reaction between Fe(II) and PAA. However, the slow reduction from Fe(III) to Fe(II) leads to the continuous or excess dosing of Fe(II) during practical application. In this study, epigallocatechin gallate (EGCG), a typical reagent extracted from green tea, was used to enhance the degradation of coumarin (COU) by Fe(II)/PAA for the first time. A complete elimination of COU (25 μM) was achieved in the presence of 50 μM Fe(II), 300 μM PAA, and 25 μM EGCG, exhibiting a k obs value of 0.108 min −1 , which was 27 times higher than that observed with Fe(II)/PAA (0.004 min −1 ). Further, Fe(II)/EGCG/PAA demonstrated remarkable pH tolerance, with a COU removal efficiency exceeding 80 % across a pH range of 3–9. Mechanisms investigations revealed that •OH played a dominant role in COU degradation by Fe(II)/EGCG/PAA (accounting for 98.2 %). The increase in EGCG concentration from 10 to 100 μM resulted in a decreased formation of •OH yield and an enhanced generation of RO•. These findings highlight the capability of EGCG to improve the oxidation capacity of Fe(II)/PAA and modulate reactive species formation. The outstanding oxidation capacity and environmental friendliness of Fe(II)/EGCG/PAA process render it a potential strategy to eliminate organic pollutants in actual water treatment.
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