CRYSTENGCOMM
·
2020
·Vol. 23
·期 6
·1455-1471
·
IF 3.117
Xiaoyan Yu,Ke Lu,Le Chen
Oxygen vacancies (OVs) can trap photogenerated electrons (e−) to promote the separation of photogenerated e− and holes (h+), and can serve as reactive sites in a variety of catalytic reactions, which benefits the photocatalytic activity of materials. In this study, doping with potassium was employed to introduce OVs into the La2NiMnO6 crystal lattice. A series of potassium doped La2NiMnO6 catalysts (La2−xKxNiMnO6: x = 0, 0.025, 0.05, 0.075, and 0.10, denoted LKNMO: LNMO, LKNMO0025, LKNMO005, LKNMO0075, and LKNMO010, respectively) were synthesized by a sol–gel method. According to the XRD refinement results by the Rietveld method, the as-prepared catalysts crystallized into a rhombohedral structure (space group: Rc). The existence of OVs was validated by X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR). The photocatalytic performances of the as-prepared catalysts were evaluated by degrading tetracycline (TC) under Xe lamp irradiation. LKNMO0075 exhibited the highest photocatalytic performance in degrading TC (100%) after 150 min. Additionally, the degradation apparent rate constant for the degradation of TC by LKNMO0075 was 2.32 times that of pure LNMO. Based on photoelectrochemical measurements, the separation of photogenerated e− and h+ was prolonged by the OV, thereby improving the transfer efficiency of photogenerated e− and h+. With the synergistic effects of the OV and the chelation of TC with metallic ions (La3+, Ni3+ and Mn2+) on the surfaces of LKNMO photocatalysts, the photocatalytic degradation of TC was effectively enhanced. The trapping experiments demonstrated that the superoxide radical (˙O2−) and h+ were the prominent active species in the photocatalytic reaction system, where the effect of ˙O2− was more significant. This work will be useful for the design of other double perovskite photocatalytic systems for the treatment of wastewater containing TC.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shiwei Guo,Huiru Zhang,Xiangrong Chen,Shichao Feng,Yinhua Wan,Jianquan Luo
With diverse selectivity, higher permeance, and good antifouling property, loose polyamide nanofiltration (NF) membranes can be potentially deployed in various bioseparation applications. However, the loose NF membrane with a low crosslinking degree generally suffers from the alkali-induced pore swelling during chemical cleaning, resulting in degradation of separation performance with time. In this work, we conceive a novel strategy to tailor the separating layer through alkaline post-etching following the interfacial polymerization process, where piperazine and tannic acid (TA) were used as water-phase monomers, and trimesoyl chloride (TMC) and ferric acetylacetonate were employed as organic monomers in n-hexane. Thereinto, the polyester network formed by TA and TMC was selectively etched by alkaline treatment, thus obtaining a loose NF membrane, whose structure and performance could be facilely tailored by controlling the TA ratio and the etching pH. As a result, the well-designed loose NF membrane exhibited higher flux, better selectivity, and more stable separation performance in a long-term filtration of diluted cane molasses. Interestingly, the obtained loose NF membrane showed excellent antiswelling ability during alkaline cleaning because of network locking induced by Fe3+ chelation, decrease in the carboxyl proportion (more hydroxyl generation due to the ester bond hydrolysis), and enhanced interface interaction between the separation layer and the sublayer attributed to catechol adhesion effect. Therefore, such a “selective-etching-induced reinforcing” strategy could endow the polyamide NF membrane with both loose and antiswelling separation layer in a reliable and scalable way, which provides a new perspective for preparing highly selective and stable NF membrane for resource recovery.
研究领域:
材料科学
·
生物工程
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Yong Zhu,Hailun Li,Jingrui Ma,Tingting Xu,Xinyu Zhou,Shiqi Jia,Jiaxin Zha,Dengping Xue,Weili Tao,Qingping Xiong,Jun Yuan,Jing Chen
Polysaccharides (PMM) from Meretrix meretrix Linnaeus exhibit a variety of biological activities; however, conventional purification methods are costly, time consuming and introducing toxic agents. This paper aimed to develop a green and efficient method for the deproteinization of PMM by copper ion chelating aerogel (CCA) adsorption. First, CCA was successfully prepared by copper ion chelating composite aerogel (CA). Then, CCA adsorption was applied to remove protein mixed in PMM. The optimal parameter conditions of this deproteinization method were screened, using the deproteinization rate ( D r %), polysaccharide recovery rate ( R r %) and selectivity coefficient ( K c ) as evaluation indicators , by single factor experiment. The optimal conditions were obtained as follows: CCA dose of 1.4%, pH value of 5.0 and adsorption temperature of 30 °C. Under these conditions, equivalent D r % (93.31 ± 1.33%), higher R r % (93.34 ± 1.08%) and K c (14.01 ± 0.46) were achieved compared with the latest reported deproteinization report. Finally, the effect of deproteinization between CCA adsorption and Sevag method, which is the most classical deproteinization method, were compared to verify the practicability of CCA adsorption. As a result, CCA adsorption not only showed much higher R r % as well as K c , but also would not cause any reagent contamination and environment pressure. In conclusion, CCA adsorption would be a green and highly efficient method with great potential in large-scale environmentally sustainable deproteinization of polysaccharides in the future.
研究领域:
生物化学
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海洋生物学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xinfei Dong,Qing-Wei Meng,Wenxiu Hu,Rongzhen Chen,Qingchun Ge
Wastewater containing trace organic contaminants (TrOCs) is usually poorly purified by unmodified polyamide (PA) membrane due to its poor selectivity and low water permeability. Herein we design a series of carboxylate-functionalized PA membranes via the chelation of Fe 3+ and carboxylate for efficient TrOCs removal through forward osmosis (FO). Citric acid, oxalic acid and their sodium salts are individually tethered to the PA membrane in water under ambient conditions. Factors influencing membrane performance are systematically investigated. The carboxylate based modification greatly improves the membrane properties that substantially enhance its separation performance. The sodium citrate (CA-Na) modified membrane produces water fluxes of up to 106% (PRO mode) and 144% (FO mode) higher than those of the PA membrane. This membrane also increases the TrOCs rejection from 75% to over 92%, irrespective of the TrOCs properties. Membrane fouling experiments reveal that the water flux of the CA-Na membrane declines by 26%, while that of the PA membrane decreases by 38% after 10-h tests. The flux recovery ratio of the CA-Na membrane achieves over 95% after physical cleaning. This study demonstrates an eco-friendly protocol to construct PA-based membrane for efficient TrOCs removal.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jinghua Sun,Hao Shen,Jie Dong,Jin Zhang,Tao Yue,Ruiping Zhang
Rhabdomyolysis (RM)-induced acute kidney injury (AKI) involves the release of large amounts of iron ions from excess myoglobin in the kidneys, which mediates the overproduction of reactive species with the onset of iron overload via the Fenton reaction, thus inducing ferroptosis and leading to renal dysfunction. Unfortunately, there are no effective treatments for AKI other than supportive care. Herein, we developed a multifunctional nanoplatform (MPD) by covalently bonding melanin nanoparticles (MP NPs) to deferoxamine. The nanoplatform has good dispersion and physiological stability, excellent chelating performance to iron ions, and broad-spectrum reactive species scavenging activity. Furthermore, cellular experiments showed that the NPs possessed high biocompatibility, antiapoptotic activity, antioxidant properties, and strong scavenging capacity of Fe2+ to mitigate iron overload, protecting the intracellular mitochondria from oxidative stress. Meanwhile, the intrinsic photoacoustic imaging capability of melanin allows the real-time monitoring of MPD NPs' target uptake and metabolic behavior in healthy and AKI mice. Most importantly, MPD NPs led to downregulation of the antioxidant pathway by targeting ferroptosis, thus effectively rescuing renal function in vivo, mitigating oxidative stress and inflammatory responses, and inhibiting renal tubular cell apoptosis. The nanoplatform offers a novel therapeutic strategy for RM-induced AKI.
研究领域:
医学
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药学
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生物材料科学
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产品关联
DOI
PubMed
高影响因子
POLYHEDRON
·
2016
·
IF 2.108
Shan Lei,Bo Jin,Qingchun Zhang,Zhichao Zhang,Xiaofang Wang,Rufang Peng,Shijin Chu
New 1,3-dicarbonyl biscatecholamide ligands were synthesized to decorporate uranium for nuclear contamination. The derivatives were characterized via 1 H NMR spectroscopy, 13 C NMR spectroscopy, FTIR spectroscopy and mass spectrometry. The complexation abilities of ligands 8a – 8d with UO 2 2+ , Cu 2+ and Zn 2+ were determined through spectrophotometric and potentiometric titrations technology. The antioxidant capacities of the ligands were assessed through DPPH antioxidant assay. Results indicated that ligands 8a – 8d are potential decorporating agents for uranyl ion (pUO 2 up to 22.41) and copper(II) ion (pCu up to 17.71) without depletion of the essential element zinc (pZn lower than 7.48).
研究领域:
放射化学
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配位化学
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环境科学
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产品关联
DOI
高影响因子
CELLULAR & MOLECULAR BIOLOGY LETTERS
·
2017
·Vol. 22
·期 1
·1-11
·
IF 1.26
Li Xican,Xie Hong,Jiang Qian,Wei Gang,Lin Lishan,Li Changying,Ou Xingmei,Yang Lichan,Xie Yulu,Fu Zhen,Liu Yamei,Chen Dongfeng
The natural dihydroflavonol (+) taxifolin was investigated for its protective effect on Fenton reagent-treated bone marrow-derived mesenchymal stem cells (bmMSCs). Various antioxidant assays were used to determine the possible mechanism. These included •OH-scavenging, 2-phenyl-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3-oxide radical-scavenging (PTIO•-scavenging), 1, 1-diphenyl-2-picryl-hydrazl radical-scavenging (DPPH•-scavenging), 2, 2′-azino-bis (3-ethylbenzo-thiazoline-6-sulfonic acid) radical-scavenging (ABTS+•-scavenging), Fe3+-reducing, and Cu2+-reducing assays. The Fe2+-binding reaction was also investigated using UV-Vis spectra. The results revealed that cell viability was fully restored, even increasing to 142.9 ± 9.3% after treatment with (+) taxifolin. In the antioxidant assays, (+) taxifolin was observed to efficiently scavenge •OH, DPPH• and ABTS+• radicals, and to increase the relative Cu2+- and Fe3+-reducing levels. In the PTIO•-scavenging assay, its IC50 values varied with pH. In the Fe2+-binding reaction, (+) taxifolin was found to yield a green solution with two UV-Vis absorbance peaks: λmax = 433 nm (ε =5.2 × 102 L mol−1 cm −1) and λmax = 721 nm (ε = 5.1 × 102 L mol−1 cm −1). These results indicate that (+) taxifolin can act as an effective •OH-scavenger, protecting bmMSCs from •OH-induced damage. Its •OH-scavenging action consists of direct and indirect antioxidant effects. Direct antioxidation occurs via multiple pathways, including ET, PCET or HAT. Indirect antioxidation involves binding to Fe2+.
研究领域:
细胞生物学
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药理学
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产品关联
DOI
PubMed
高影响因子
CHROMATOGRAPHIA
·
2022
·Vol. 85
·期 8
·743-754
·
IF 2.213
Lin Min,Li Xinxin,Zhang Hongfeng,Ji Wenquan,Shi Yuhan,Li Qinran,Zhang Chenxi,Deng Qiliang
Abstract The C-terminal epitope imprinted polymers on the silica were prepared by reversible addition-fragmentation chain transfer (RAFT) strategy with C-terminal nonapeptide of cytochrome c (Cyt c) as the template. 4-cyano-4-(phenylcarbonothioylthio) phetanoic acid was immobilized on the silica as a chain transfer agent to regulate the polymerization of the imprinted layer to enhance the recognition performance of the imprinted materials for the peptide and target protein. Additionally, zinc methacrylate was used as a functional monomer to form the imprinted sites through the synergistic effect of Zn 2+ chelating, hydrogen bonding and electrostatic attraction, which further improved the recognition between polymers and protein. The molecularly imprinted polymers prepared with RAFT strategy show good recognition for the epitope peptide and Cyt c with imprinting factors of 7.96 and 6.17, respectively, which is higher than those prepared without RAFT strategy. Furthermore, the imprinted polymers have a good binding capacity and imprinting factor for Cyt c in multi-proteins selective recognition and have good reusability. The performance of Cyt c recognition in bovine serum by the epitope imprinted polymers was calculated by HPLC and the results demonstrated the well selectivity and potential application for Cyt c recognition in biological sample. Graphical abstract
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Weifeng Chen,Guo Lv,Jinrun Fu,Haiyan Ren,Jialu Shen,Jie Cao,Xiang Liu
Achieving the controlled release of H2 through an effective approach still faces many challenges. Herein, high-quality graphene quantum dots (GQDs) are synthesized from a new precursor, 1,2,4-trihydroxy benzene, and a multifunctional platform of Rh@GQDs is further developed for the controlled H2 evolution upon the hydrolysis of NH3BH3 (AB). More importantly, the designing concepts of multistep and stepless speed controls have been introduced in the domains of both H2 evolution for the first time. Through a novel designing protocol, the rate of H2 evolution can be freely regulated and constantly varied on demand by means of chelation between Zn2+ and ethylene diamine tetraacetic acid (EDTA). The density functional theory calculation indicates that Zn2+ has the priority to be adsorbed onto Rh(100) due to its larger adsorption energy (107.98 kcal·mol–1) than that of AB (36.36 kcal·mol–1). A controlling mechanism is presented such that Zn2+ will cover the active sites of the nanocatalyst to prevent the H2 evolution, and EDTA can chelate Zn2+ to reactivate the nanocatalyst for the production of H2, greatly facilitating use of this strategy in other catalytic reactions. Moreover, it is demonstrated that the protocol is equally valid for diverse hydrogen storage materials. Therefore, this work not only establishes whole new concepts for the controlled production of H2 but also explains their mechanism, thus remarkably advancing the utilization of H2 energy and significantly enlightening the controlled process of catalysis.
研究领域:
材料科学
·
催化化学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Gels
·
2022
·Vol. 8
·期 5
·307
·
IF 4.432
Zhichuan Tang,Zhengsong Qiu,Hanyi Zhong,Yujie Kang,Baoyu Guo
The problem of wellbore stability has a marked impact on oil and gas exploration and development in the process of drilling. Marine mussel proteins can adhere and encapsulate firmly on deep-water rocks, providing inspiration for solving borehole stability problem and this ability comes from catechol groups. In this paper, a novel biopolymer was synthesized with chitosan and catechol (named “SDGB”) by Schiff base-reduction reaction, was developed as an encapsulator in water-based drilling fluids (WBDF). In addition, the chemical enhancing wellbore stability performance of different encapsulators were investigated and compared. The results showed that there were aromatic ring structure, amines, and catechol groups in catechol-chitosan biopolymer molecule. The high shale recovery rate demonstrated its strong shale inhibition performance. The rock treated by catechol-chitosan biopolymer had higher tension shear strength and uniaxial compression strength than others, which indicates that it can effectively strengthen the rock and bind loose minerals in micro-pore and micro-fracture of rock samples. The rheological and filtration property of the WBDF containing catechol-chitosan biopolymer is stable before and after 130 °C/16 h hot rolling, demonstrating its good compatibility with other WBDF agents. Moreover, SDGB could chelate with metal ions, forming a stable covalent bond, which plays an important role in adhesiveness, inhibition, and blockage.
研究领域:
石油工程
·
生物材料科学
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DOI
高影响因子
POLYMER
·
2017
·
IF 3.684
Yuling Sun,Xiangxue Lyu,Zhibo Li,Yanbin Huang
Phosphate-binding particles are clinically used to reduce the phosphate level in patients with chronic kidney diseases. However, the binding efficiency of the current amino-functional polymers is low, resulting in high pill burden and low patient adherence. Here, we used polylysine nanogels with amino- and guanidinium-functional groups (PLL nanogel and GPLL nanogel), respectively, and experimentally proved that guanidinium is a much more efficient phosphate-binding group than the amino group at all the tested conditions. The phosphate binding amount of the GPLL nanogel is 60% higher than that of the PLL nanogel at pH 7, 55% higher at pH 2, and 30% higher in the presence of 150 mM NaCl . This guanidination strategy should also be applicable to non-polypeptide systems for anion sequestration. Though the difference of amino and guanidinium functional groups interacting with phosphate ions had been known in the literature, this is the first experimental study to directly compare their phosphate binding performance in clinically relevant conditions (e.g., crosslinked particle forms with all the other parameters controlled to be the same). Therefore, guanidinium functionalized polymers have the potential to become the new generation therapeutics.
研究领域:
生物材料
·
医学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Xiulei Qi,Lei Yu,Yide Liu,Long Chen,Xiankai Li
Excellent electrical and fluidic properties render liquid metal (LM) a promising material for flexible electronics, soft robotics, and stretchable circuits. Although producing LM micro/nano droplets by nanometerization addresses the tricky issue of the processing result from high surface tension, it still remains challenging to obtain stable LM droplets because of their dynamic surfaces. In this study, LM powders wrapped with robust shells are fabricated by bimetallic ions chelation strategy. During sonicating LM (e.g., EGaIn) in an alginate solution, a microgel shell is first formed by the coordination of Ga 3+ and carboxyl groups. Subsequently, LM powders are achieved by introducing Ca 2+ as secondary metal ions to chelate with redundant carboxyl groups. Besides high chemical stability in water and air, these nonstick LM powders also exhibit superior photothermal effects for energy harvesting, being capable of recovering electrical conductivity by mechanical sintering for flexible electronics. These conductive circuits based on LM powders not only work as electro-thermal heaters, and electromagnetic interference shielding material but also can be designed as smart actuators. Thus, this bimetallic ions chelation strategy may start a pathway to produce stable, transportable LM powders with multifunctional properties, applicable in stretchable electronics, smart actuators, and electric skins.
研究领域:
材料科学
·
纳米技术
·
能源工程
·
柔性电子学
✓ 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）