Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 19
·10337-10345
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IF 11.9
Zhongguo Wang,Xiong-Fei Zhang,Lian Shu,Jianfeng Yao
Hydrogels fabricated from top-down wood nanotechnology have attracted a lot of attention. Herein, two-dimensional and conductive MXenes are utilized as fillers and functional agents to impart a wood hydrogel with multifunctionality. Specifically, a wood substrate was directly converted into a wood hydrogel using an inorganic ZnCl2 solution system. ZnCl2 has a dual role in promoting the exfoliation and dispersion of MXenes, and simultaneously inducing the rearrangement of cellulose fibers. An extensive hydrogen bonding network between cellulose and MXenes can be constructed, and the ionic coordination between Zn2+ ions and hydroxyl groups serves as a secondary cross-linked network for the composite hydrogel. Enabled by the MXenes and Zn2+ ions, the as-prepared wood hydrogel presents well-preserved anisotropy, superior mechanical performance, high conductivity and extreme temperature tolerance. Moreover, the wood hydrogels demonstrate huge potential in the healthcare monitoring applications of human motion detection, temperature sensing and photothermal conversion. This study provides a simple strategy for developing wood hydrogel sensor systems with high conductivity and a wide temperature range response.
研究领域:
材料科学
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纳米技术
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生物医学工程
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jingyi Liang,Chao Li,Shu Zhang,Shuang Wang,Xun Hu
Dual activators can be used together or in sequence to intensify pore development in activation of biomass. If used in sequence, arrangement of an activator in first- and second-round activation dictates overall reaction network in activation and pore characteristics of activated carbon (AC). Herein, activation of willow wood with single, mixed ZnCl 2 and H 3 PO 4 , or activators in sequence (activation firstly with ZnCl 2 or H 3 PO 4 at 350 °C and the other activator subsequently at 550 °C) were conducted. The results showed that the H 3 PO 4 →ZnCl 2 sequential activation (activating first with H 3 PO 4 then with ZnCl 2 ) destructed P-O-C bonds and created additional micropores, forming H 3 PO 4 →ZnCl 2 -AC of 1344.7 m 2 /g with superior capability for adsorption of phenol from phosphorus doping. Nonetheless, The ZnCl 2 →H 3 PO 4 sequential activation did not enhance pore development (998.5 vs. 991.8 m 2 /g for H 3 PO 4 -AC) and reduced AC yield to 27.8 %, due to deficient aliphatics for second-round activation with H 3 PO 4 . Co-activation with ZnCl 2 +H 3 PO 4 only enhanced percentage of micropore but not S BET . Activation with ZnCl 2 but not H 3 PO 4 transformed fibers into densified bulky particles. However, activator selected in first-round activation determined final morphology of ACs in sequential activation.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 1
·377-388
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IF 3.049
Tianyu Wu,Wenqing Zhang,Xin Jin,Xiangyi Liang,Gang Sui,Xiaoping Yang
Carbon fiber-reinforced polymer composites have been widely used in various fields and have inevitably produced large amounts of composite waste. The recycling of carbon fibers with high value has become an active research topic at related institutions and production enterprises. In this paper, the catalytic pyrolysis of T700 carbon fiber/epoxy composites in molten salt was studied. Due to the efficient solubility of molten ZnCl2 for the epoxy matrix and catalytic fracture of the C–N bonds by the action of Zn2+ ions, the epoxy composites can be completely degraded at 360 °C in 80 min under standard pressure, and the reclamation efficiency was significantly enhanced compared with conventional pyrolysis reclamation without a catalyst. The types and contents of the main oxygen-containing functional groups on the surfaces of the fibers reclaimed with ZnCl2 were similar to those of the virgin fibers, and the graphitization structure of the carbon fibers was not destroyed in the pyrolysis process. The tensile strength of a monofilament of the fibers reclaimed with ZnCl2 was obviously higher than that of fibers reclaimed in air; it reached a high retention rate that was about 95% that of the virgin fibers. The fibers reclaimed with ZnCl2 after sizing exhibited a desirable reinforcing effect on the flexure performance and interlaminar shear strength of unidirectional carbon fiber/epoxy composites which was close to the performance levels of composite samples containing commercial T700 carbon fibers. Therefore, efficient technology to reclaim high-quality carbon fibers from epoxy matrices has been devised.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
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IF 10.7
Ming Chen,Mengyu Ren,Manyao Zhu,Haichuan Zhang,Tianya Chen,Yong Zhang,Shujuan Yang
The development of a direct method for preparing regenerated cellulose (RC) ultrafiltration membranes from cellulose is urgently needed. In this study, refined cotton was used as the raw material to successfully prepare RC ultrafiltration membranes at room temperature using a ZnCl 2 /AlCl 3 solvent system combined with a nonsolvent-induced phase separation (NIPS) method. This solvent system effectively degrades cellulose, producing RC ultrafiltration membranes with varying degrees of polymerization (DP). The research results indicate that reducing the DP of cellulose significantly decreases the viscosity of the solution, facilitating the formation of an asymmetric, finger-like pore structures in the membrane. Furthermore, a decrease in DP slightly enlarges the surface pore size and significantly thickens the dense layer. At a DP of 250, the water flux of the DP250-ET membrane reached 630 L·m −2 ·h −1 ·bar −1 , with a molecular weight cut-off (MWCO) of ~300 kDa, enabling efficient separation of viruses (LRV > 3.91) and IgG. The exposure of more hydroxy groups on the RC enhances the membrane's hydrophilicity, indicated by a water contact angle (WCA) of 39.5°. Compared to commercial polyethersulfone (PES) membranes, the DP250-ET membrane exhibited lower protein adsorption and excellent anti-fouling performance in practical applications (FRR > 80 %). Overall, this work confirms the significant potential of the eco-friendly ZnCl 2 /AlCl 3 solvent system in the fabrication of RC ultrafiltration membranes, where the structure and performance of the membrane can be tailored by adjusting the DP of cellulose.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Peiyao Liu,Zhengzeng Yang,Mengyuan Zhang,Yufeng Liu,Dandan Han,Dan Wu,Charles Chunbao Xu,Jianshe Wang
C-H carboxylation of furoic acid (FA) with CO2 is an atom-efficient strategy to produce 2,5-furandicarboxylic acid (2,5-FDCA) from lignocellulose. The existing carbonate-promoted CO2 carboxylation processes rely on the use of large amounts of expensive Cs2CO3 as deprotonating reagent and molten salt. Substitution of Cs with other cheap and abundant alkali ions (such as K and Na) can reduce the use of Cs, but faces the problem of low yield of 2,5-FDCA. This study found that the addition of catalytic amounts of ZnCl2 as a Lewis acid can increase the yield of 2,5-FDCA in the CO2 carboxylation reaction of Na/K-FA in a molten salt reaction system. 1H NMR analysis and DFT calculations confirmed that ZnCl2 coordinates with the furan ring through electron transfer from the conjugated furan ring to Zn2+, thereby activating the H at the C5 position of Na/K-FA. This coordination lengthened the C5-H bond and lowered its heterolytic dissociation energy, making it more susceptible to being deprotonated by CO32- and subsequently carboxylated by CO2. The developed Lewis acid coordination strategy provides a new idea for the efficient construction of C-C bonds between CO2 and aromatics through carbonate-promoted C-H carboxylation.
研究领域:
化学工程
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可再生资源转化
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催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 4
·040505
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IF 3.721
Longfei Qin,Zuoyi Xiao,Shangru Zhai,Shifu Wang,Haisong Wang,Guoxiang Wang,Weijie Cai,Zhongcheng Li,Qingda An
Biomass-derived hierarchical porous carbons have attracted considerable attention due to their low cost, environmental friendliness and sustainability. However, the preparation of porous carbon with typically hierarchical pores is still challengeable. In this work, a facile and efficient strategy was proposed to obtain alginate-derived porous carbon by a combination of hard-template and chemical-activation technique. During the fabrication process the nano-ZnO particles displayed triple functions: (a) The nano-ZnO particles were behaved as the hard template to generate more pores. (b) ZnCl2 derived from the nano-ZnO particles acted as a cross-linking agent for obtaining zinc alginate (Zn-SA) hydrogel beads. (c) ZnCl2 was also employed as an activating agent to form micropores during the high-temperature carbonization process. As a subsequence, the obtained carbon exhibited well-developed hierarchical porous structure with high specific surface area of up to 2589 m2 g−1. Due to the high specific surface area, good electrical conductivity and synergistic effect among the typically hierarchical pores, the PC-ZnO-ZnCl2-650 exhibited a high specific capacitance of 316 F g−1 at the current density of 0.5 A g−1 and excellent cycling stability with capacitance retention of 94.4% at 5 A g−1 over 5000 cycles. This ingenious synthesis strategy can provide a new way for efficient preparation of hierarchical porous material.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Sensors & Diagnostics
·
2023
·Vol. 3
·期 1
·135-146
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IF 0
Ke Gao,Yuying Du,Na Pan,Xuewei Zhou,Liping Lu,Xiayan Wang
Cadmium (Cd) can cause cell oxidative stress and cytotoxicity. Few studies have focused on inhibitory effects on Cd2+-induced oxidative stress and related cytotoxicity. Scanning electrochemical microscopy (SECM) is a highly sensitive and non-invasive electrochemical analytical method. However, no information exists on inhibitory effects on Cd2+-induced cell oxidative stress using SECM technology. Herein, we studied the effects of ascorbic acid (AsA), zinc chloride (ZnCl2), and calcium chelator 1,2-bis (2-aminophenoxy) ethane-N,N,N′,N′-tetraacetic acid tetraethoxy methyl ester (BAPTA-AM) on cell oxidative stress with SECM. Subsequently, we studied the inhibitory effects of AsA, ZnCl2, and BAPTA-AM on Cd2+-induced cell oxidative stress. Consequently, 50 μmol L−1 AsA, 5 μmol L−1 ZnCl2, and 5 μmol L−1 BAPTA-AM did not produce reactive oxygen species (ROS) and had little effect on cell viability. However, they could significantly reduce Cd2+-induced excessive ROS and alleviate apoptosis (P < 0.01). Additionally, AsA had the strongest inhibitory effects on Cd2+-induced oxidative stress, followed by BAPTA-AM and ZnCl2. The inhibitory effects of AsA, ZnCl2, and BAPTA-AM on Cd2+-induced cytotoxicity might result from directly scavenging ROS and inhibiting oxidative stress-mediated signal transduction, enhancing antioxidant activities and maintaining cell membrane stabilities, and chelating excess calcium2+ (Ca2+) to hinder its subsequent signal transduction, respectively. Scavenging excessive ROS and inhibiting cellular oxidative stress-mediated signal transduction might be the most effective way to alleviate Cd2+-induced cytotoxicity. Our study provides empirical evidence on the inhibitory effects of AsA, ZnCl2, and BAPTA-AM as specialized inhibitors against Cd2+-induced cellular oxidative stress and cytotoxicity, providing precious ideas for detoxifying toxic environmental metal pollutants.
研究领域:
生物化学
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毒理学
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环境科学
✓ 已验证
DOI
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Xinrong Ke,Ping Lu,Jinling Cai,Jiayuan Wang,Changshen Ye,Chen Yang,Ting Qiu
The removal of aromatic sulfur-containing species by adsorption method in liquid hydrocarbon fuels (LHFs) are concerned in worldwide, but it is still a challenge due to intricacy-designed adsorbents, resulting in high cost of preparation and poor stability. Herein, an easy-prepared adsorbent, Zn-NC-T (T represents the carbonization temperature, T = 600, 800 and 1000 °C), which derived from the carbonization of low-cost ZnCl 2 -chitosan polymers, is reported. The optimal Zn-NC-800 exhibits dibenzothiophene (DBT) uptakes of 43.3 mg S/g, which is superior to many reported desulfurization adsorbents, including metal–organic frameworks, zeolites and metal-loaded porous carbons. It also keeps satisfactory reusability with adsorption capacity loss of 5.3 mg S/g after 5 cycles because of the high-efficiency removal of adsorbates under high temperature regeneration. Moreover, the Zn-NC-800 shows great potential for sulfur-free LHFs production in the industry by breakthrough experiment for adsorbing low-concentration DBT (100 ppm w S) with ca. 0 ppm w S content in outlet LHFs. And the mechanism investigation on the adsorption isotherms and kinetics indicates that the adsorption process of DBT is controlled by chemisorption. Furthermore, DFT calculations suggest that the Zn, N-co-doped carbons show stronger adsorption strength (e.g., DBT, −1.79 eV) than the sole N-doped carbons (−0.93 eV), indicating the main contribution of Zn, N-cooperated adsorptive sites. The reported Zn-NC-T equips with advantages of low-cost raw materials, high adsorption capacity and good reusability, making it promising candidate for production of sulfur-free LHFs.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 4
·942
·
IF 3.1
Hao Zhang,Zhaozhou Wei,Deyuan Xiong,Yao Wu,Menglong Tong,Huiping Su,Zuoyuan Zhang,Jian Liao
Using sodium lignosulfonate as feedstock, ZnCl2and NaHCO3co-activated the hierarchical porous carbons (HPCs) were prepared by one-pot pyrolysis with different NaHCO3dosages (0–4 g) and carbonization temperatures (400–600 °C). Subsequently, phosphotungstate (HPW) was supported with the resulting biochar for the α-pinene hydration reaction to produce α-terpineol. The optimum preparation conditions were determined according to the yield of α-terpineol. The formation mechanism and physicochemical properties of HPCs were analyzed through TG, SEM, XPS, XRD, FT-IR, and N2adsorption–desorption isotherms. The results demonstrated that NaHCO3underwent a two-step reaction which liberated a substantial quantity of CO2, thereby enhancing activated carbon’s macroporous and mesoporous structures. Simultaneously, NaHCO3mitigated strong acid gas (HCl) emissions during ZnCl2activation. Compared with AC450-4:8:0 prepared by ZnCl2activation alone, the total pore volume of AC450-4:8:2 prepared by co-activation is increased from 0.595 mL/g to 0.754 mL/g and the mesopore rate from 47.7% to 77.8%, which is conducive to reducing the steric hindrance of the hydration reaction and improving the selectivity. Hydration experiments show that the selectivity of α-terpineol is 55.7% under HPW/AC450-4:8:2 catalysis, higher than 31.0% for HPW and 47.4% for HPW/AC450-4:8:0.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2021
·
IF 2.917
Ai-min LIU,Meng-xia GUO,Zhong-ning SHI,Yu-bao LIU,Feng-guo LIU,Xian-wei HU,You-jian YANG,Wen-ju TAO,Zhao-wen WANG
Zinc chloride (ZnCl 2 ) was dissolved in the 1,3-dimethyl-2-imidazolinone (DMI) solvent, and the metallic zinc coatings were obtained by electrodeposition in room-temperature ambient air. The conductivity ( σ ), viscosity ( η ), and density ( ρ ) of the DMI−ZnCl 2 solvated ionic liquid at various temperatures ( T ) were measured and fitted. Furthermore, cyclic voltammetry was used to study the electrochemical behavior of Zn(II) in the DMI−ZnCl 2 solvated ionic liquid, indicating that the reduction of Zn(II) on the tungsten electrode was a one-step two-electron transfer irreversible process. XRD and SEM−EDS analysis of the cathode product confirmed that the deposited coating was metallic zinc. Finally, the effects of deposition potential, temperature and duration on the morphology of zinc coatings were investigated. The results showed that a dense and uniform zinc coating was obtained by potentiostatic electro- deposition at −2 V (vs Pt) and 353 K for 1 h.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Tingting Li,Nianlu Li,Haoyu Sheng,Luyao Zhang,Qian Luo,Sashuang Liu,Yijing Zhao,Wenqiang Chen,Dexiang Liu,Zhen Wang
Inflammatory bowel disease (IBD) is a kind of chronic non-specific intestinal inflammatory disease, which accompanied by various abnormal psychological states, such as anxiety and depression. Nevertheless, the pathogenesis of IBD with depression is still unclear. Herein, we synthesized an enable a drinkable, liquid in situ-forming hydrogel, which form directly in the stomach through sequential ingestion of a crosslinker solution of CaCl 2 and ε-poly-l-lysine (ε-PL), followed by a drug-containing polymer solution of sodium alginate (SA). Using olsalazine (Olsa) and antioxidant (ellagic acid (EA) and ZnCl 2 ) as small molecule drug (referred as Olsa/EA/Zn), the resulting hydrogel (referred as Olsa/EA/Zn@SA/ε-PL hydrogel) could form rapidly in gastric fluid and exhibit remarkable stability under acidic conditions, unique low swelling properties and a rational release of drug in entering the intestine. We demonstrated that the oral administration of drug-loaded in situ-forming hydrogel with excellent antioxidant, anti-inflammatory activities, cytocompatibility, intestinal retention capacity of the drug, significantly enhanced the IBD therapeutic outcomes, and relieve accompanying depression-like symptoms in colitis mice. Overall, this designed in situ-forming hydrogel oral delivery system will open up new pathway in combined gastrointestinal therapy and psychological comorbidities for IBD patients, especially those with dysphagia.
研究领域:
药剂学
·
神经科学
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胃肠病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·533-541
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IF 3.591
Mei-Jiao Zeng,Xiaofeng Li,Shu-Meng Hao,Jin Qu,Wei Li,Jing Wu,Tianyu Zhao,Zhong-Zhen Yu
Although wood-derived carbon (WC) and its derivatives are promising electrodes for supercapacitors because of their hierarchically porous architecture, superior mechanical flexibility, and environmental friendliness, pure WC electrodes usually exhibit poor wettability, inferior areal capacitance, and unsatisfactory electrical conductivity. Herein, hierarchically porous graphene/wood-derived carbon (GWC) aerogels are fabricated for high-performance supercapacitor electrodes by chemical reduction of graphene oxide/wood hydrogels, followed by directional-freezing, freeze-drying, and carbonization at 1000 °C. An activated GWC (AGWC) anode is prepared by activating GWC using ZnCl2 to create more mass transport paths and increase wettability, while the cathode is synthesized by in situ growth of NiCo2O4 (NCO) in the channels of GWC to bring about pseudocapacitance and increase energy storage sites. The resultant NCO@GWC cathode and AGWC anode exhibit superior capacitances of 8540 and 10 965 mF cm−2 (854 and 183 F g−1) at 1 mA cm−2, respectively. The assembled NCO@GWC//AGWC asymmetric supercapacitor exhibits a superior areal capacitance of 7116 mF cm−2 at 1 mA cm−2, a high energy density of 2.2 mW h cm−2 (5.6 mW h cm−3), a power density of 45.1 mW cm−2 (112.8 mW cm−3), and an excellent cycling stability of 100% capacitance retention over 1000 cycles at 10 mA cm−2.
研究领域:
材料科学
·
能源存储与转换
✓ 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）