CARBOHYDRATE POLYMERS
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2017
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IF 4.811
Yufei Chen,Jing Ru,Biyao Geng,Haiying Wang,Congcong Tong,Chungui Du,Shengchun Wu,Hongzhi Liu
A composite cryogel was prepared from quaternized nanofibrillated cellulose (Q-NFC) and chitosan (CS) through a combination of freeze-drying and cross-linking with epichlorohydrin. The specific surface area of the composite cryogel was approximately two times that of Q-NFC cryogel. And the composite cryogel exhibited superior adsorption properties of anionic dyes than either the Q-NFC or CS cryogel controls. The adsorption isotherm well fitted the Langmuir model with the maximum theoretical adsorption capacity up to 473.9 mg/g. The adsorption behavior was found to follow pseudo second-order kinetic model, indicating the chemisorption nature. Notably, the composite cryogel could effectively separate the cationic dye from anionic one. Furthermore, the composite cryogel displayed excellent reusability, evidenced by the removal percentage of Acid red 88 still as high as 96% even after five adsorption-desorption cycles. These advantages would make it an environmentally friendly candidate for the use in the separation and efficient removal of anionic dyes.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2017
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IF 2.764
Baihao You,Qingtao Li,Hua Dong,Tao Huang,Xiaodong Cao,Hua Liao
The fabrication of osteochondral tissue engineering scaffolds comprised of different layers is a big challenge. Herein, bilayers comprised of double network hydrogels with or without nano hydroxyapatite (HAp) were developed by exploiting the radical reaction of poly(ethylene glycol) diacrylate (PEGDA) and the Schiff-base reaction of N-carboxyethyl chitosan (CEC) and oxidized hyaluronic acid sodium (OHA) for osteochondral tissue engineering. The bilayered osteochondral scaffold was successfully fabricated based on the superior self-healing property of both hydrogels and evaluated by scanning electron microscopy, macroscopic observation and mechanical measurements. In addition, the hydrogels exhibited good biocompatibility as demonstrated by the in vitro cytotoxicity and in vivo implantation tests. The results indicated that the bilayered hydrogel had great potential for application in osteochondral tissue engineering.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Fuyin Ma,Zheng Li,Haogui Zhao,Yiyun Geng,Wei Zhou,Qingnuan Li,Lan Zhang
As a new carbon-based membrane material used for ionic and molecular sieving, the graphene oxide (GO) membrane also has potential application in radiochemical separation. In this work, the permeation performances of some typical metallic elements in high level-liquid waste (HLLW) through the ionic sieving 5-μm-thick GO membranes were investigated. It was found that the permeation rates of ions through GO membranes markedly decreased with the increase of hydrated ionic radii. Cs(I) and Sr(II) permeated through GO membranes quickly, whereas lanthanide ions and actinide ions infiltrated much more slowly, thus providing the feasibility of separation according to the difference of hydrated ionic radii. Moreover, the concentrations of initial metal ions and acidity in feed solutions also had influences on the permeation of ions through GO membranes, and higher initial metal ions and feed solution acidity were favorable to the removal of Cs(I) and Sr(II). The barrier separation test indicated that GO membranes had promising ability for the separation of Cs(I) and Sr(II) from lanthanide and actinide ions due to the difference of hydrated ion radius, and the separation factor of Cs(I)/U(VI) and Sr(II)/U(VI) would reach about 10 and 3 in single penetration. The presented results demonstrated that the membrane separation based on GO membrane would be a promising candidate for the removal of Cs(I) and Sr(II) from HLLW.
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RAPID COMMUNICATIONS IN MASS SPECTROMETRY
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2016
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IF 2.226
Xiaoji Cao,Chenlu Wang,Weimin Mo
Rationale Aryl thioethers are potentially useful precursors for constructing various biologically active sulfur-containing heterocycles. The detailed relationship between the losses of HS radical and CS with the spin multiplicity of positively charged diphenyl sulfide biradicals derived from 3-iodophenyl phenyl sulfides has not been obtained by tandem mass spectrometry combined with theoretical calculations. Methods Collision-induced dissociation mass spectrometry experiments were carried out using an ion trap mass spectrometer with APCI in positive mode. The MS/MS experiment for dibenzothiophene was performed by CI triple-quadrupole mass spectrometry in positive ion mode. The accurate masses of fragments were obtained by reflective TOFMS with an EI source. Theoretical calculations were achieved by the density functional theory method at the B3LYP level with the 6−31+G(d, p) basis set in the Gaussian 03 package of programs. Results In the fragmentation of positively charged diphenyl sulfide biradicals, losses of HS· and CS were observed, which were proposed to originate from spin multiplicity transformation from a triplet ground state to a singlet excited state and a phenyl radical shift in triplet ground state, respectively. Moreover, a protonated dibenzothiophene intermediate was confirmed to exist in the process of HS radical loss. A linear correlation was established between the product ion abundance from the two competitive losses and the Hammett constants (σ) of substituent groups on the benzene ring. Conclusions The eliminations of HS· and CS in the fragmentation of positively charged diphenyl sulfide biradicals were triggered by spin multiplicity transformation from a triplet ground state to a singlet excited state and a phenyl radical shift in a triplet ground state, respectively. Based on theoretical calculations, two competitive neutral losses are thermodynamically controlled. Copyright © 2016 John Wiley & Sons, Ltd.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2017
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IF 1.591
Lin Yang,Shengfang Li,Chunyan Sun
A new Cs(I) magnetic ion-imprinted polymer (Cs(I)-MIIP) aimed at the selective adsorption and separation of Cs(I) from salt lake brine was prepared. The Fe3O4@SiO2 was used as supporter, Cs(I) as template ion, and carboxymethyl chitosan as functional monomer. The product was characterized by Fourier transform infrared spectra, XRD, energy-dispersive spectrometry, scanning electron microcopy, thermogravimetric analysis, and vibrating sample magnetometer. The adsorption of the Cs(I)-MIIP in solution was investigated, which indicated the maximum adsorption capacity was 36.15 mg·g−1 under the optimum conditions. The pseudo-first-order kinetic model and the Freundlich isotherm model were applied to predict the adsorption process of Cs(I) onto Cs(I)-MIIP. Selectivity experiments showed that the relative selectivity coefficient (k′) were 24.995, 1.73, 1.43, 4.83, and 1.63 to Cs(I)/Li(I), Cs(I)/Na(I), Cs(I)/K(I), Cs(I)/Rb(I), and Cs(I)/Sr(II) binary solutions, higher than those of NIP, respectively. Furthermore, the Cs(I)-MIIP was successfully applied to the enrichment and separation of Cs(I) from the salt lake brine of Qinghai, with satisfactory Cs(I) recovery rates.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Lijun Huang,Yuliang Liu,Xingxin Sheng,Yongbo Zhu,Xinyi Li,Meng Liang,Hao Xie,Ming Zhong,Binbin Zhou
A novel MOFs hydrogel composite (MIP-CuMOFs@SA-CS) was created by integrating a molecularly imprinted metal–organic framework (MIP-CuMOFs) within a scaffold of sodium alginate-chitosan (SA-CS(Cu 2+ )). The MIP-CuMOFs@SA-CS served as a recognition element to construct an electrochemical sensor for the detection of trace amounts of chelerythrine (CHE). Reduced graphene oxide (rGO) and reduced graphene nanoribbons (rGNRs) were employed for electrode modification and served as the sensing platform. It was to enhance the stability and sensitivity attributes of the sensor system. The signal probe of copper hexacyanoferrate (CuHCF) was generated through the chemical reaction involving Cu 2+ within the composite structure of MIP-CuMOFs@SA-CS with potassium ferricyanide. The experimental results showed that the constructed sensor has a good linear relationship (50 ∼ 500 nmol L −1 ) and a low detection limit (13.83 nmol L −1 ). Moreover, the sensor exhibited good selectivity, recovery rates, and repeatability (RSD = 2.81 %). With the subjected to spiked serum samples, the demonstrating recovery percentages were in the range of 97.17 % to 101.73 %. The CHE molecularly imprinted electrochemical sensor constructed is capable of detecting trace amounts of CHE with the advantages of simplicity, rapidity, high sensitivity, and low cost, which provides a useful reference for the detection of low concentrations of CHE.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Haixu Zhao,Yandong Liu,Weikang Zhang,Xiaoqing Peng,Qilun Tang,Qiong Ding,Xuefan Deng,Haibo Zhang
The synthesis of efficient catalysts for the hydrolysis of ammonia borane (NH 3 BH 3 , AB) is a matter of critical importance and immediate necessity, as it is currently considered a promising approach for the production of hydrogen. The synergy of interactions between different metals has been widely applied in the hydrolysis of AB. In this work, we first applied Cs [ closo -B 6 H 7 ] as the reductant to prepare a series of Ni x Pd y Mo z NPs catalysts using a simple in-situ reduction method. The structural and physical chemical properties of the as-prepared catalysts are investigated employing a multitude of various characterizations. Utilizing the optimal catalyst Ni 0·3 Pd 0·7 Mo 0.2 NPs, AB hydrolysis can be completed at room temperature in just 21 s. This catalyst exhibits a lower activation energy ( Ea = 52.3 kJ mol −1 ) and relatively higher activity (TOF = 252.7 mmolH 2 ·mmol metal −1 min −1 ), which greatly outperforms many previously reported similar or corresponding catalysts. The enhancement in catalytic activity is ascribed to the moderate reducibility of Cs [ closo -B 6 H 7 ] and the synergistic interaction among Ni, Pd, and Mo. These results suggest the promise of multi-metal catalysts derived from Cs [ closo -B 6 H 7 ] for the hydrolytic dehydrogenation of hydrogen storage materials.
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MOLECULES
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2024
·Vol. 29
·期 13
·3126
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IF 4.2
Dong Li,Siyu Tian,Qiuhua Qian,Caiyun Gao,Hongfang Shen,Fei Han
Cesium doped WO3(Cs-WO3) photocatalyst with high and stable oxidation activity was successfully synthesized by a one-step hydrothermal method using Cs2CO3as the doped metal ion source and tungstic acid (H2WO4) as the tungsten source. A series of analytical characterization tools and oxygen precipitation activity tests were used to compare the effects of different additions of Cs2CO3on the crystal structure and microscopic morphologies. The UV–visible diffuse reflectance spectra (DRS) of Cs-doped material exhibited a significant red shift in the absorption edge with new shoulders appearing at 440–520 nm. The formation of an oxygen vacancy was confirmed in Cs-WO3by the EPR signal, which can effectively regulate the electronic structure of the catalyst surface and contribute to improving the activity of the oxygen evolution reaction (OER). The photocatalytic OER results showed that the Cs-WO3-0.1 exhibited the optimal oxygen precipitation activity, reaching 58.28 µmol at 6 h, which was greater than six times higher than that of WO3-0 (9.76 μmol). It can be attributed to the synergistic effect of the increase in the conduction band position of Cs-WO3-0.1 (0.11 V) and oxygen vacancies compared to WO3-0, which accelerate the electron conduction rate and slow down the rapid compounding of photogenerated electrons–holes, improving the water-catalytic oxygen precipitation activity of WO3.
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Small
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2025
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IF 12.1
Zhenpeng Cheng,Tianle Wang,Junyan Zhu,Yaqi He,Shijie Liu,Ming-Yu Li,Haifei Lu,Xiaoyan Wen,Jihoon Lee,Sisi Liu,Sui Mao
Adaptive learning capability of optoelectronic synaptic hardware holds promising application prospects in next generation artificial intelligence, and the development of biometric retina perception is sternly hampered by three crucial issues, including well-balance between excitatory and inhibitory, non-volatile multi-state storage, and optimal energy consumption. In this work, a novel Cs 2 AgBiBr 6 /ZnO non-volatile optoelectronic synapse is proposed and successfully programmed with optical excitatory and electronic inhibitory in the light of dual-mechanism: Lead-free perovskite Cs 2 AgBiBr 6 guarantees abundant photogenerated carrier concentration, and the process of carrier capture and release occurs in ZnO layer, which can collaboratively modulate various synaptic plasticity behaviors depending on distinct stimulus. Consequently, multi-bit storage is attained with the dual-mechanism non-volatile memory (DNVM) as a function of consecutive light spikes. The energy consumption of the DNVM is 1.85 nJ at a single light spike, and an ultra-low one of 13.8 fJ is triggered with a single electrical pulse, which approximatively meets the requirement of the biological synaptic event energy consumption. The performance of the DNVM is further evaluated with the Pavlov's classical conditioning experiment and visual hardware system, offering an exciting paradigm for implementing on-chip adaptive visual perception and neuromorphic computing.
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NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Hengxi Wang,Xiaonan Yang,Lijun Meng,Senjian Han,Shiqiang Wang,Yafei Guo,Tianlong Deng
Prussian blue analogue (PBA) membranes for efficient Cs removal via in situ synthesis have attracted much interest. Herein, copper-substituted PBA was developed and optimized on the surface of a substrate with the aid of tannic acid (TA). The fabricated Cu-PBA-TA membrane was systematically investigated for its Cs adsorption property in static and dynamic experiments. The as-prepared membrane showed a maximum adsorption capacity of 265.0 mg g−1, which was the highest when compared to that of previously reported PBA membranes. Applied in geothermal water, the Cu-PBA-TA membrane showed favorable selectivity (Kd, 8680 mL g−1) and the removal rate of Cs+ was about 90%. Its fast adsorption rate that reached equilibrium within 40 min and the benign reusability in the dynamic treatment of geothermal water confirmed the potential of the membrane for large-scale application.
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ENERGY & FUELS
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2024
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IF 5.2
Tianxu Su,Bin Guan,Chunzheng Zheng,Jiefei Zhou,Zhen Huang
Developing low-temperature, high-efficiency ammonia decomposition catalysts for hydrogen production is essential for the broad application of hydrogen. This study conducted a systematic investigation of Ru/MgO catalysts modified with different alkali metals (Na, K, Cs), unveiling the impact of these modifications on catalyst performance and developing a highly efficient low-temperature ammonia decomposition catalyst. The addition of all alkali metals enhances the catalytic performance of Ru/MgO for ammonia decomposition, especially the addition of K, which results in the optimal enhancement of the catalyst, achieving a 75% ammonia decomposition efficiency at 350 °C (GHSV= 2,000 mL/h·gcat), more than doubling the performance of the unmodified Ru/MgO catalyst. The study revealed that the addition of potassium (K) altered the rate-determining step of the ammonia decomposition reaction from nitrogen recombination to the dissociation of the first hydrogen atom, and reduced the overall energy barrier required for the reaction. This facilitated the desorption of nitrogen from the Ru surface and the conversion of NH3, thereby accelerating the rate of the ammonia decomposition reaction.
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Small
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2024
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IF 13
Lin Mei,Wenchong Ouyang,Limin Xu,Yuanlong Huang,Qi Liu,Yu Bai,Quanming Lu,Tianzhi Luo,Zhengwei Wu
Hydrogels present significant potential in flexible materials designed for electromagnetic interference (EMI) shielding, attributed to their soft, stretchable mechanical properties and water-rich porous structures. Unfortunately, EMI shielding hydrogels commonly suffer from low mechanical properties, deficient fracture energy, and low strength, which limit the serviceability of these materials in complex mechanical environments. In this study, the double network strategy is successfully utilized along with the Hofmeister effect to create MXene/PAA (polyacrylic acid)-CS (chitosan) hydrogels and further strengthen and toughen the gel with (NH 4 ) 2 SO 4 solution. The gel exhibits enhanced functionalities such as outstanding stretchability, excellent strain sensitivity (11.66), and super fracture energy (≥9 kJ m −2 ). Notably, it demonstrates outstanding shielding effectiveness of 73.8 dB in the terahertz (THz) range, and the shielding properties can be effectively tuned by varying the MXene content, the (NH 4 ) 2 SO 4 concentration, and the thickness of the hydrogel. Additionally, the gel shows robust and superior shielding effectiveness after repeated stretching and long-term dehydration. The MXene/PAA-CS double-network (DN) hydrogels would be an excellent candidate for EMI shielding materials in advanced flexible electronic equipment and soft robots.
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