JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Han Jia,Pan Huang,Qiuxia Wang,Yugui Han,Shaoyan Wang,Jiajun Dai,Jinyong Song,Fan Zhang,Hui Yan,Kaihe Lv
It is an urgent subject to search high-performance shale inhibitors used in water-based drilling fluids for drilling safety. In the present work, two imidazolium-based ionic liquids (ILs), 1-hexyl −3-methylimidazolium bromide (BMH) and its corresponding gemini type, 1,2-bis(3-hexylimidazolium-1-yl) ethane bromide (HMH), were introduced as promising shale inhibitors. The inhibition performances were assessed and compared with the conventional inhibitors potassium chloride and polyether diamine (PDA) via the inhibition evaluation tests including sodium bentonite (Na-bent) pellets immersing tests, linear swelling tests and shale hot-rolling recovery tests. Both ILs inhibitors, especially HMH, shown terrific inhibition performance with lower dosages and maintained high-performance at temperature up to 160 °C. The inhibition mechanism was analyzed by FTIR , X-ray diffraction (XRD), Zeta potential tests, particle size distribution measurement, contact angle measurement and surface tension measurement. The results demonstrated both BMH and HMH effectively inhibit the shale hydration and swelling. HMH, with two positively charged headgroups and two hydrophobic tails, was better than BMH in entering the interlayer space of clay, reducing Zeta potential, forming hydrophobic shield and reducing the surface tension, which was responsible for its superior inhibition performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Tao Cai,Wengao Zeng,Yutang Liu,Longlu Wang,Wanyue Dong,Hui Chen,Xinnian Xia
Silver orthophosphate (Ag 3 PO 4 ) based semiconductor photocatalysis have been widely investigated for environmental purification due to its strong oxidation ability. Yet, its poor photostability and low photoactivity hamper its extensive applications. Here, an inorganic-organic Z-scheme photocatalytic system for antibiotic degradation demonstrated high photoactivity and stability through the use of Ag 3 PO 4 /Perylene diimide organic supermolecule (PDIsm). The apparent rate constant of tetracycline hydrochloride (TC-H) degradation with Ag 3 PO 4 /PDIsm was 1.5 times that of Ag 3 PO 4 and 8 times that of PDIsm. The photocatalytic activity of Ag 3 PO 4 /PDIsm toward TC-H still kept 65 % after four reuses, while pure Ag 3 PO 4 only kept 22 %. We revealed that this high photoactivity and photostability arisen from the efficient carriers separation and the formation of direct Z-scheme junction. Importantly, this Z-scheme electron transfer pathway was confirmed by thorough experimental study and density functional theory (DFT) calculation. This work demonstrated the significant potential of Ag 3 PO 4 -based inorganic-organic Z-scheme photocatalyst in environmental remediation.
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FUEL
·
2019
·
IF 5.128
Bihong Lv,Junhai Wu,Chengrui Lin,Zuoming Zhou,Guohua Jing
Due to its excellent and reversible CO 2 uptake, the novel aprotic heterocyclic anion-based dual functionalized ionic liquid solution ([DETAH][AHA]) presented as an efficient candidate for CO 2 capture. The kinetics of CO 2 capture into [DETAH][AHA] solutions, e.g., [DETAH][Im] and [DETAH][Tz], was studied by using a double-stirred cell, with concentrations ranging from 0.25 to 1.0 mol/L and temperatures from 303 to 333 K. The overall first-order reaction rate constants ( k ov ) and the secondary-order reaction rate constants ( k 2, FIL ) of CO 2 capture into this two [DETAH][AHA] solutions were obtained, and they all increased as the temperature increased. The relationship between k 2, FIL and reaction temperature was determined by Arrhenius equation, which expressed as k 2 = 1.0365 × 10 12 exp - 5873.67 T and k 2 = 3.5361 × 10 12 exp - 6380.60 T , respectively. The calculated activation energies of such two solutions were 48.83 kJ/mol and 53.05 kJ/mol, respectively. From the heat duty evaluation, the total CO 2 regeneration energy consumption of [DETAH][Im] and [DETAH][Tz] were respectively 2.94 and 2.84 GJ·mol −1 CO 2 , which were all less than that of traditional MEA solution due to their lower desorption reaction heat. A fast absorbent rate, a lower activation energies and regeneration energy consumption of [DETAH][AHA] solutions indicate greater potential and application prospects.
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ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Chunyu Li,Chao Wu,Baoquan Zhang
Blending porous inorganic fillers into polymers to fabricate mixed matrix membranes (MMMs) is an efficient method to acquire good-quality membranes for CO2 separation and purification. The poor interface coupling between bulky filling particles and polymer phase in MMMs results in reduced mechanical strengths with low separation performances. The novel two-dimensional (2D) and ultrathin α-Ni(im)2 nanosheets with high aspect ratios are herein synthesized and blended with Pebax MH 1657 to prepare MMMs. The larger contacting area and strong hydrogen bonding between α-Ni(im)2 nanosheets and Pebax improve their compatibility to form defect-free MMMs. The ultrathin α-Ni(im)2 nanosheets in MMMs can effectively enhance CO2/CH4 selectivity based on molecular sieving. With the addition of 2 wt % of α-Ni(im)2 nanosheets, the as-prepared MMMs exhibit CO2/CH4 selectivity up to 33.4 with a permeability of 100.6 Barrer. Compared with pure Pebax membrane, the separation selectivity shows a 72% increase with no significant change in CO2 permeability.
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JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Xingyu Liu,Jinwei Gao,Guofu Zhou,Wanqiang Liu,Qianming Wang,Yuhui Zheng
The colloidal synthesis of nanoscale perovskites has generated intensive interests very recently and most of the preparation processes are performed in organic phases due to requirement of maintaining the stability. Since the exploration of CsPbX 3 assembly in aqueous medium is still rarely reported in recent years, we use the simple organic building block (2-methylimidazole, MEIM) for the first time to collect the mixture of two metal precursors (CsBr and PbBr 2 ) and CsPbBr 3 /MEIM nanocrystals have been perfectly formed with the aid of the effective organic layer in terms of coordination interactions with metal ions . Such lead halide perovskite material with diameters of 8–10 nm possesses stable and green-emitting feature in pure water. Extensive experimental conditions including reaction time, reagent ratio, addition sequence, pH/temperature dependence and solvent effect have been investigated in details. This study finds a new way to the controllable synthesis of perovskite nanoparticles in eco-friendly solvents and represents a next generation target material for utilization in opto-electronic fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Zhaoyang Wang,Fangyu Xiong,Haizheng Tao,Yuanzheng Yue
To optimize the Na 0·74 CoO 2 -based cathode materials for sodium-ion batteries, we fabricated a series of Na 0·74 CoO 2 /C/N-based composites by sintering the mixtures of ZIF-4(Co) (Co [H 2 C 3 N 2 ] 2 ) and Na 2 CO 3 , which possess various molar Na/Co ratios (X = 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and 2.0), at 800 °C for 6 h. By performing the electrochemical characterizations, we found that the composite with X = 0.7 (NC-0.7) exhibits the optimum sodium storage performance, i.e., excellent Na + storage capacity (107.9 mA h g −1 at 0.1 C), and high cycling stability (74% of the discharge capacity retention after 500 cycles at 10 C). In addition, for this NC-0.7 composite, we discovered a large difference (48.1 mA h g −1 ) between the charging (59.8 mA h g −1 ) and discharging (107.9 mA h g −1 ) capacities for the first cycle. Using the X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscope, we clarified the atomic-scale origin of the large capacity difference, and revealed the role of the amorphous phase in the as-prepared Na 0·74 CoO 2 /C/N composite cathode.
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RSC Advances
·
2019
·Vol. 9
·期 56
·32425-32434
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IF 3.049
Zhike Wang,Honglian Ge,Xueyuan Wang,Cunling Ye,Shunli Fan
Ionic liquid modified silicas with high adsorption capacity for phenols prompt us to deeply explore the contribution of interactions between the adsorbent and adsorbate, with a particular focus on hydrophobicity, π–π, electrostatic and acid–base interactions. Herein, by introducing a series of typical substituent groups including N,N-dimethylaminopropyl (A), benzyl (B), dodecyl (D) and naphthylmethyl (N) in an imidazole ring (Im), three mono-immobilized and two co-immobilized imidazolium ionic liquid modified silicas, namely SilprAImCl, SilprBImCl, SilprNImCl, SilprDBImCl and SilprDAImCl, werre synthesized for removal and recovery of 2,4-dinitrophenol (2,4-DNP) from aqueous solutions. Adsorption kinetics, isotherms, thermodynamic analysis and desorption experiments have been carried out. The experimental results reveal that the substituent groups such as N,N-dimethylaminopropyl, benzyl and naphthylmethyl on the imidazole ring can significantly enhance the adsorption of 2,4-DNP via the acid–base interaction or π–π interaction and the adsorption capacity of 2,4-DNP follows the order: SilprNImCl > SilprAImCl > SilprBImCl. Furthermore, SilprDBImCl exhibits the largest adsorption capacity and SilprDAImCl has the lowest among the five adsorbents. These interesting finds indicate that the combination of hydrophobicity and π–π interactions lead to enhanced adsorption performance towards 2,4-DNP, while the combination of the hydrophobicity and acid–base interactions can restrain greatly adsorption of 2,4-DNP from aqueous medium. Adsorption mechanisms of 2,4-DNP on the five adsorbents have been clarified. These results will provide a deeper insight for efficient removal of phenols from water environments.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Xiaojing Lv,Lixia Zha,Liang Qian,Xinjia Xu,Qian Bi,Zhiyi Xu,Dominic S. Wright,Cheng Zhang
A water-soluble perylene bisimide derivative of N,N-bis(2-phosphonoethyl)-3,4,9,10-perylenediimide (PPDI) was synthesized by introducing phosphoric acid units. PPDI self-assembled films were prepared controllably on hydroxylated ITO glass through a zirconium-phosphonate approach. There is a linear increase between the film thickness and the number of self-assembly layers. Electrochemical and spectroelectrochemical analysis reveal that the PPDI self-assembled films show excellent reversible redox behavior and cathodic electrochromic character which can be switched from a neutral orange-red color to deep purple color in the reduced state. In particular, the PPDI self-assembled film with 10 layers have good integrated performance in term of reasonable optical contrast (31%), fast switching time (0.75 s) and good cycle stability. A large-scale patterned all-solid-state electrochromic device (50 mm × 60 mm) was fabricated by utilizing PPDI self-assembled film as the electrochromic layer and the device shows obvious reversible electrochromism , which provides a new direction for the production of electrochromic device, like smart-window, sunglasses and electronic tags.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 42
·16595-16603
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IF 3.069
Qigao Shang,Tianyu Zeng,Ke Gao,Nannan Liu,Qingrong Cheng,Guiying Liao,Zhiquan Pan,Hong Zhou
A coordination polymer, {[Co(tib)2]·SO4}n, has been synthesized by a solvothermal reaction using the flexible tripodal ligand 1,3,5-tris(imidazol-1-ylmethyl)benzene (TIB) with metal salts, and has been characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and UV-vis diffuse reflectance spectroscopy. The photocatalytic properties of the complex were investigated by the photodegradation of methylene blue (MB) dye under visible light. Control experiments clearly revealed that the pH of the solution plays an important role in MB degradation, especially when in alkaline solution. {[Co(tib)2]·SO4}n has excellent degradation ability of MB, and 150 mL MB (10 mg L−1) could be fully photodegraded in 25 min with a high pseudo-first-order rate constant. The reaction mechanism of photocatalysis showed that O2˙− and h+ are the main active substances, based on active species trapping experiments and ESR. The excellent photocatalytic activity is mainly attributed to the strong light harvesting and high reactivity of electrons and holes. Moreover, liquid chromatography-mass spectrometry (LC-MS) was used to analyze the catalytic process, effectively revealing the photodegradation mechanism of MB. Recycling experiments demonstrated that the photocatalyst is reusable and stable. This MOF-based photocatalyst will, therefore, provide new efforts towards environmental purification.
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Polymer-Plastics Technology and Materials
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2019
·
IF 0
Xiao Zhang,Yanghui Jiang,Cong Jia,Panfang Lu,Hongkun Chen
The paper presents a new controlled release fertilizer coated by dimer acid-based polyurethane (PU). The structure and property of the sample were characterized. Results indicated that the polyether polyol modified PU (MPU) coating reduced water absorption rate by 72.1% after 29 d, and increased the cross-linking density by 23%, and decreased the coating porosity by 26%, Moreover, MPUFs and PUFs both exhibited excellent nutrient controlled release abilities, especially the MPUF possessed longer nitrogen release longevity (118 d,131%) compared with PUF (51 d). Thus, the high-performance MPUFs with environmentally friendly and excellent controlled release could be widely applied to agricultural fields.
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CHEMICAL ENGINEERING SCIENCE
·
2020
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IF 3.871
Shuo Li,Han Jiang,Jun Zhang,Ao-Shuai Zhang,Yong-dong Zhao,Xin Zhao,Zhi-Ping Zhao
Polysulfone (PSF) material loaded with ionic liquids (ILs), PSF-ILs, was prepared by grafting imidazolyl acid ILs onto PSF by chemical bonding. A porous PSF-ILs microsphere catalyst was prepared via non-solvent induced phase separation (NIPS) method in order to catalyze the biomass inulin hydrolysis. The influences of degree of chloromethylation of PSF, hydrolysis temperature, catalyst dosage, PSF-ILs microsphere morphology, coagulation bath of NIPS and inulin concentration on hydrolysis performance were studied respectively. Under this optimal reaction conditions, 95.65% conversion of inulin into reducing sugar was achieved. The results suggested that the catalytic inulin hydrolysis performance of PSF-ILs microsphere was attractive due to high-density spatial distribution of the active sites on the surface and inner pore wall of microsphere after ILs immobilized. The hydrolysis kinetics was also investigated. The kinetic models of inulin hydrolysis catalyzed by PSF-ILs microsphere were employed to predict the hydrolysis in a wider range of experimental conditions. Furthermore, the stability tests showed that PSF-ILs microsphere catalyst could be effectively separated and recovered from hydrolysates, and has good regeneration ability. The morphology of PSF-ILs microspheres remained intact after eight trials of catalytic hydrolysis, avoiding the crushing phenomenon like a powder polymer material. More importantly, the PSF-ILs microsphere can effectively avoid the potential harm of ILs to the ecological environment, and is a potential green catalyst.
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Materials
·
2026
·Vol. 19
·期 18
·3955
·
IF 3.7
Yuan-Hao Yao,Jun-Ting Xu,Ze-Kun Zhang
Introducing charged groups into comb-like copolymers significantly enhances the incompatibility between the main chain and side chains, enabling sub-5 nm microphase separation. In this work, a series of charged comb-like copolymers with imidazolium ionic junctions and mixed alkyl side chains (C18/C8, C20/C12, C22/C12) were synthesized. The regulation of microphase separation behavior via side-chain composition and length were investigated. The crystallization of long alkyl side chains could disrupt pre-formed microphase-separated structures, rendering a disordered state at low temperatures. The systems underwent a lower disorder–order transition (LDOT) that was closely correlated with the melting of side-chain crystallites, forming lamellar (LAM) or hexagonally packed cylindrical (HEX) nanostructures. By adjusting the side-chain length and feed ratio (r) of long/short chains, both the LDOT and closed-loop sequence of transitions (LDOT at low temperatures and upper order–disorder transition (UODT) at high temperatures) were achieved, with transition temperatures shifting accordingly. Notably, the SAXS data at a specific composition are consistent with the Frank–Kasper (F-K) A15 complex spherical phase. Moreover, the domain spacing showed an approximately linear dependence on the nominal long-chain feed ratio within the investigated range. This work demonstrates that statistical side-chain functionalization is an effective strategy for tuning microphase separation in charged comb-like copolymers with ultra-small self-assembled dimensions.
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