CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Kai Zhang,Shuhang Ren,Xin Yang,Yucui Hou,Weize Wu,Yuyun Bao
Four thermostable functional deep eutectic solvents (DESs) based on imidazole (Im), 2-methylimidazole, 2-ethylimidazole, and 2-propylimidazole as hydrogen bond acceptor (HBA) and glycerol (Gly) as hydrogen bond donor (HBD) were prepared. All prepared DESs can efficiently capture low-concentration SO 2 . The SO 2 solubility increased with decreasing temperature and increasing SO 2 concentration and the available absorption of 2000 ppm SO 2 in Im-Gly DES was high, up to 0.634 mol of SO 2 /mol of Im (0.161 g of SO 2 /g of DES) with n Im : n Gly = 1:2 at 40 °C. The regeneration experiments showed that the SO 2 absorption capacities in Im-Gly DES did not change after 5 absorption/desorption cycles. Furthermore, the absorption mechanism based on 1 H NMR and FTIR analyses indicated that there was an acid–base interaction between SO 2 and Im.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Xia Chen,Wangyang Lu,Tiefeng Xu,Nan Li,Dandan Qin,Zhexin Zhu,Gangqiang Wang,Wenxing Chen
In nature, metalloporphyrins, such as chlorophyll, cytochrome P450 and so forth, are key materials in maintaining the ecological cycles, especially the carbon cycle, and play an important role in both photosynthesis and the catalytic oxidation of organisms. Inspired by these factors, we skillfully combined photocatalysis and biomimetic catalysis using imidazole (IMD)-functionalized modification of g-C 3 N 4 and axial coordination with hemin. Compared with pure hemin, g-C 3 N 4 and a mixture of the two, our novel catalytic system (g-C 3 N 4 -IMD-hemin/H 2 O 2 ) showed high photocatalytic oxidation activity for the degradation of 4-chlorophenol (4-CP), and the stability of hemin was enhanced under solar irradiation. Furthermore, the effect of pH and the sustained photocatalytic oxidation stability of g-C 3 N 4 -IMD-hemin for degrading 4-CP were investigated. The results indicated that g-C 3 N 4 -IMD-hemin presents a high photocatalytic oxidation activity over a wide pH range and exhibits good recyclability. A series of designed experiments showed that superoxide radicals ( O 2 − ), high-valent iron (Fe(IV) = O) species, peroxy radicals ( OOH) and few hydroxyl radicals ( OH) were generated in the g-C 3 N 4 -IMD-hemin/H 2 O 2 system. This synergistic photocatalytic and biomimetic process offers new insight for the utilization of solar energy and offers a new perspective for the exploration of catalysts for environmental remediation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2017
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IF 2.843
Dongshun Deng,Xiaobang Liu,Bao Gao
Four azole-based DESs from acetyl choline chloride (ACC) and azoles (imidazole, Im, and 1,2,4-triazole, Tri) were prepared and utilized for SO2 capture. Their physicochemical properties, including density, viscosity, TGA, freezing point, and pH, were determined. The influences of temperature and pressure on the SO2 absorption performance of the DESs were systematically conducted. The results showed that all the DESs exhibited efficient and reversible absorption for SO2, and ACC-Im possessed higher absorption capacity than ACC-Tri, with the maximum value of 0.381 g of SO2 per g of ACC-Im (1:2) DES at 303.15 K and 0.1 bar. The possible absorption mechanism was investigated using 1H NMR and FTIR spectroscopy. Furthermore, the ACC-Tri (1:2) was used to capture SO2 at low partial pressure, showing high available capacity of 0.116 g of SO2 per g of DES for 3300 ppm of SO2. Present DESs emerge as promising absorbents for SO2 due to easy preparation, high absorption capacity, and good reversibility.
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ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Dong-Yang Zhang,Yue Zheng,Cai-Ping Tan,Jing-Hua Sun,Wei Zhang,Liang-Nian Ji,Zong-Wan Mao
The combination of photothermal therapy (PTT) and photodynamic therapy (PDT) can kill cancer cells more efficiently as compared with PTT or PDT treatment alone. In this work, we use nanohybrid rGO-Ru-PEG composed of reduced nanographene oxide (rGO) sheet and a phosphorescent polyethylene glycol modified Ru(II) complex (Ru-PEG) for combined PTT and PDT of cancer. Photosensitizer and imaging agent Ru-PEG is decorated onto delivery and PTT agent rGO via π–π stacking and hydrophobic interactions. The chemical structure and morphology have been characterized by various methods. The release of Ru-PEG from rGO surface is pH-dependent, and irradiation can increase the release rate considerably. The combined effects of PDT and PTT have been evaluated by cytotoxicity assay under serial irradiation at 808 nm (PTT) and 450 nm (PDT). Mechanism investigation shows that the nanohybrid can induce apoptosis through generation of reactive oxygen species (ROS) and cathepsin-initiated apoptotic signaling pathways under light excitation. rGO-Ru-PEG can be applied to in vivo photothermal imaging, and high treatment efficacy was achieved for in vivo antitumor experiments when irradiated with an 808 nm laser and a 450 nm laser. Our work provides an effective strategy for the construction of multifunctional imaging and phototherapeutic nanohybrids for the treatment of cancer.
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ENERGY CONVERSION AND MANAGEMENT
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2017
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IF 5.589
Heng Zhang,Hu Li,Hu Pan,Xiaofang Liu,Kaili Yang,Shan Huang,Song Yang
In the present study, catalytic production of biodiesel from a new alternative non-edible feedstock Koelreuteria integrifoliola ( K. integrifoliola ) with a Brönsted-Lewis acidic ionic liquid (IL) immobilized on a magnetic support Fe 3 O 4 @SiO 2 (FS-B-L-IL) was investigated for the first time. Excitingly, K. integrifoliola contains a high oil content (54.05%) with an average acid value (AV) of 4.66 mg KOH/g. Furthermore, the FS-B-L-IL catalyst was characterized with XRD, FT-IR, SEM, HR-TEM, TG, pyridine-IR and VSM. It was found that FS-B-L-IL possessed a uniform core-shell structure with strong magnetic responsiveness, and showed high activity in simultaneously catalytic transesterification and esterification of crude K. integrifoliola seed oil (CKISO), giving fatty acid methyl ester (FAME) yield of 93.7% under optimal conditions. The reaction followed pseudo-first order kinetics and the activation energy was calculated to be 62.6 kJ/mol. In addition, FS-B-L-IL exhibited a heterogeneous catalytic behavior and could be recycled for at least five times with negligible loss of activity. The main fuel properties of the obtained K. integrifoliola biodiesel were also evaluated, which were comparable to specifications prescribed in the ASTM D6751 and EN 14214.
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DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 34
·13477-13482
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IF 4.177
He Chen,Ping-Xiao Liu,Ning Xu,Xing Meng,Hai-Ning Wang,Zi-Yan Zhou
A 3D new metal–organic framework (MOF) [Cu4Cl(TIPE)3]·3Cl (1) has been synthesized and characterized. Compound 1 exhibits good chemical stability in aqueous solution with the pH ranging from 1 to 11. Interestingly, compound 1 shows high catalytic activities for the degradation of dyes (RhB, MB and MO) under LED and natural light irradiation. The Ea of 1 for RhB, MB and MO degradation is obtained to be 79.71, 66.14 and 87.26 kJ mol−1, respectively. Furthermore, compound 1 can be reused in the catalytic process without the catalytic activity obviously decreasing.
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BIOMATERIALS
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2017
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IF 8.402
Ziqian Wang,Hao Wu,Peilian Liu,Fang Zeng,Shuizhu Wu
In vivo monitoring of the biodistribution and activation of prodrugs is highly attractive, and the self-immolative dendritic architecture is deemed as a promising approach for constructing theranostic prodrug in which the release/activation of different payloads is needed. Herein, A GSH-triggered and self-immolative dendritic platform comprising an anticancer drug camptothecin (CPT), a cleavable linker and a two-photon NIR fluorophore (dicyanomethylene-4H-pyran, DCM) has been developed for in situ tracking of drug release and antitumour therapy. In vitro experiments demonstrate that, the presence of glutathione (GSH) induces the cleavage of the self-immolative linker, resulting in comitant release of the drug and the dye. Upon cell internalization and under one- or two-photon excitation, prominent intracellular fluorescence can be observed, indicating the release of the payloads in live cells. Upon loaded in phospholipid vesicles , the prodrug has also been successfully utilized for in vivo and in situ tracking of drug release and cancer therapy in a mouse model. Several hours post injection, the prodrug generates strong fluorescence on tumour sites, demonstrating the prodrug's capability of monitoring the on-site drug release. Moreover, the prodrug shows considerable high activity and exerts obvious inhibition towards tumour growth. This work suggests that the prodrug with self-immolative dendritic structure can work well in vivo and this strategy may provide an alternative approach for designing theranostic drug delivery systems.
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Journal of the Taiwan Institute of Chemical Engineers
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2016
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IF 2.848
Bin Jiang,Zhaohe Huang,Luhong Zhang,Yongli Sun,Huawei Yang,Hanrong Bi
In this work, several kinds of imidazolate-based ether-functionalized ionic liquids (ILs) were synthesized and used for CO 2 capture. It is note-worthy that IL with [C 6 O 2 mim] + as cation has much smaller molecular weight but similar mole capacity compared with those with [P 66614 ] + , which is usually used as cation for anion-functionalized ILs in the carbon capture process. Among these task functionalized ILs, [C 6 O 2 mim][4-Br-Im] can be a potential candidate for carbon capture. Not only has [C 6 O 2 mim][4-Br-Im] an extremely high CO 2 capacity (more than 1.60 mol CO 2 per mol IL achieved), but also shows high uptake efficiency and recovery capability. In addition, [C 6 O 2 mim][4-Br-Im] has higher thermal stability, higher water stability and lower absorption enthalpy. The mechanism of this carbon capture process was investigated by FT-IR and NMR spectroscopy. Surprisingly, in this process, CO 2 first bound the cations to form zwitterions. When CO 2 was continuously bubbled into ILs, the zwitterions started to dissociate and the anions combined with CO 2 . It is verified that this process is a carbon capture transforming process with the Cationic-drive transforming to Anionic-drive. This work offers a deep understanding of the combination process between CO 2 and imidazolate-based with aprotic heterocyclic anions.
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SENSORS
·
2025
·Vol. 25
·期 6
·1670
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IF 3.5
Yujie Niu,Jinxin Wang,Zhongxing Zhang,Ting Liu
Gaseous oxygen detection is essential in numerous production and manufacturing sectors. To meet the varying oxygen detection requirements across different fields, techniques that offer a wide oxygen detection range should be developed. In this study, a wood-based oxygen sensing material was designed using balsa wood as the supporting matrix and gadolinium hemoporphyrin monomethyl ether (Gd-HMME) as the oxygen-sensitive indicator. The wood-based Gd-HMME exhibits a cellular porous structure, which not only facilitates the loading of a substantial number of indicator molecules but also enables the rapid interaction between indicators and oxygen molecules.OPis defined as the ratio of the phosphorescence intensity of the oxygen-sensing material in the anaerobic and aerobic environment. A linear relationship betweenOPand oxygen partial pressure ([O2]) was obtained within the whole range of [O2] (0–100 kPa). The wood-based Gd-HMME exhibited excellent resistance to photobleaching, along with a rapid response time (3.9 s) and recovery time (4.4 s). It was demonstrated that the measurement results obtained using wood-based Gd-HMME were not influenced by other gaseous components present in the air. An automatic oxygen detection system was developed using LabVIEW for practical use, and the limit of detection was determined to be 0.01 kPa.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongfeng Hong,Kejing Zhang,Mingshuo Yang,Ruijing Yang,Yusheng Xu,Qiudong Duan,Dacheng Zhou,Yongjin Li,Zhengwen Yang,Zhiguo Song,Yong Yang,Qi Wang,Jianbei Qiu
Photocatalytic conversion of CO 2 into valuable fuels is considered a promising approach for the development of sustainable and renewable energy sources. In this study, we utilized Mo-MOF as a precursor to obtain MoO 3 by pyrolytic derivatization and treated it to obtain MOF-MoO 3-x containing oxygen vacancies as a catalyst for the photocatalytic reduction of CO 2 to CO. MOF derivatization altered the morphology of the MoO 3 , which made the formation of oxygen vacancies easier and facilitated the separation of electron-hole pairs. Meanwhile, the increased specific surface area and the appearance of surface oxygen vacancies enhanced the CO 2 adsorption and activation capabilities of MOF-MoO 3-x . As a result, MOF-MoO 3-x demonstrated a significant enhances in the photoreduction activity of CO 2 . Its CO yield was 29.1 μmolg −1 h −1 , which was 3.7 times higher than that of MOF-MoO 3 and 2.4 times higher than that of H-MoO 3-x . This innovative strategy may provide a new avenue for improving the comprehensive performance of photocatalysts and developing renewable energy sources.
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Nature Protocols
·
2024
·
IF 13.1
Luo Juan,Yu Yao,Wang Ke,He Sizhe,Wang Longjie,Liang Fangfang,Chin Jason W.,Tang Shan
Catalytic mechanism-based, light-activated traps have recently been developed to identify the substrates of cysteine or serine hydrolases. These traps are hydrolase mutants whose catalytic cysteine or serine are replaced with genetically encoded 2,3-diaminopropionic acid (DAP). DAP-containing hydrolases specifically capture the transient thioester- or ester-linked acyl–enzyme intermediates resulting from the first step of the proteolytic reaction as their stable amide analogs. The trapped substrate fragments allow the downstream identification of hydrolase substrates by mass spectrometry and immunoblotting. In this protocol, we provide a detailed step-by-step guide for substrate capture and identification of the peptidase domain of the large tegument protein deneddylase (UL36 USP ) from human herpesvirus 1, both in mammalian cell lysate and live mammalian cells. Four procedures are included: Procedure 1, DAP-mediated substrate trapping in mammalian cell lysate (~8 d); Procedure 2, DAP-mediated substrate trapping in adherent mammalian cells (~6 d); Procedure 3, DAP-mediated substrate trapping in suspension mammalian cells (~5 d); and Procedure 4, substrate identification and validation (~12–13 d). Basic skills to perform protein expression in bacteria or mammalian cells, affinity enrichment and proteomic analysis are required to implement the protocol. This protocol will be a practical guide for identifying substrates of serine or cysteine hydrolases either in a complex mixture, where genetic manipulation is challenging, or in live cells such as bacteria, yeasts and mammalian cells.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Bin Chen,Hegang Shu,Yujun Guo,Yingjie Xu
In this work, the effect of the structure and substitution of azole-based anion on the CO 2 capture and viscosity ( η ) of metal chelate-based dual functional ionic liquids (DFILs) with [K(DGA) 2 ] + cation was investigated. The CO 2 absorption capacity of DFILs at 0.1 MPa and 333.2 K shows that methyl and nitro groups on the azole-based anion, such as pyrazolide ([Pyr] − ) and imidazolide ([Im] − ), attenuate their reactivity with CO 2 through the steric hindrance and electron-withdrawing effects, respectively. Furthermore, the CO 2 absorption capacity of [K(DGA) 2 ][Pyr] is larger than that of [K(DGA) 2 ][Im], which is due to the interaction of the two adjacent N atoms in the [Pyr] − anion with CO 2 , as confirmed by DFT calculations. The CO 2 absorption mechanism shows that both [Pyr] − anion and [K(DGA) 2 ] + cation of [K(DGA) 2 ][Pyr] can chemically interact with CO 2 , making its saturated uptake at 333.2 K as high as 1.47 mol CO 2 per mole IL. Moreover, CO 2 interacts preferentially with [Pyr] − , and the [K(DGA) 2 ] + –CO 2 interaction is enhanced when the CO 2 uptake is greater than 0.5 mol CO 2 per mole IL. η of pure [K(DGA) 2 ][Pyr] is lower than that of pure [K(DGA) 2 ][Im]. η of [K(DGA) 2 ][Pyr] increases with the increase of CO 2 absorption, and the rapid increase in η after CO 2 uptake greater than 0.5 is attributed to the formation of [K(DGA) 2 ] + –CO 2 interactions.
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