ULTRASONICS SONOCHEMISTRY
·
2024
·
IF 8.7
Xiaojie Hu,Ting Xiao,Qidong Huang,Shichen Liu,Hongxia Liu,Sili Ren,Dandan Gong,Wuhui Luo
The use of a resin to selectively separate thiomolybdate from a tungsten (W) feed solution is a well-known protocol for achieve high-purity W products; however, the regeneration of saturated resin is laborious. In this study, poly(diallyl dimethyl ammonium chloride) (PDADMA) was used to modify ultrasound-pretreated montmorillonite (Mt) for W and molybdenum (Mo) separation for the first time, and the resultant tetrathiomolybdate (MoS 4 2- )-loaded composite was further tested to remove heavy metals instead of regeneration. Among the three variables of ultrasound pretreatment, that is, Mt concentration, ultrasound power, and treatment time, the Mt concentration exhibited the most significant influence followed by ultrasound power on the separation performance of W and Mo. Compared to the distance of the interlayer space and the surface charge of the modified Mt, the PDADMA content showed a closer correlation with the W/Mo separation coefficient. Assisted by Box–Behnken design, with Mt concentration of 6.9 g/L, ultrasound power of 593.8 W, and treatment time of 13.8 min, the composite with the greatest separation coefficient was obtained. The adsorption of Cu(II) on the optimal W/Mo separation-derived composite was ascribed to the formation of Cu-S complexes, while that of Pb(II) was attributed to complexation and surface precipitation. In contrast, ion exchange with the initially loaded anions, reduction by sulfide to Cr(III), and formation of Cr(III)-S complexes accounted for Cr(VI) removal. The adsorption of Cu(II) and Pb(II) equilibrated faster and showed higher acid-resistance than that of Cr(VI). The adsorption capacities for Cu(II), Pb(II), and Cr(VI) were 0.535, 1.398, and 0.882 mmol/g, respectively. Applying PDADMA to modify Mt as a reagent for W/Mo separation was feasible, and the derived composite was capable of removing cationic and anionic heavy metals.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 11
·1-13
·
IF 2.009
Wu Xiaoxu,Zhang Wei,Li Zhi,Zhang Yan,Huang Siqi,Liu Qiong
Methylchlorosilanes (MSCs) of the type (CH 3 ) n SiCl 4−n ( n = 1, 2, 3) are usually used for surface modification of silica aerogels (SAs), in which the quantity of Si–Cl and Si–CH 3 groups deeply affects the properties of prepared SAs. In this work, methyltrichlorosilane (MTCS, n = 1), dimethyldichlorosilane (DMDCS, n = 2), and trimethylchlorosilane (TMCS, n = 3) were used to modify wet gels and the effects of Si–Cl and Si–CH 3 groups’ quantity on microstructures and surface properties were explored in detail. It turned out that the MTCS modified SA (MSA) possessed the most compact and nonuniform three-dimensional nanostructure among the three SAs, accompanied by the biggest density of ~ 0.14 g/cm 3 . Further investigations demonstrated that all the three SAs had similar BET surface area of about 900 m 2 /g and average pore size of 10–15 nm. Though FTIR analysis presented the discrepancies obviously among the three SAs, the thermal stability of the three SAs was similar, with the onset and peak temperatures in the exothermic reaction of methyl groups being ~ 240 °C and ~ 270 °C, respectively. The best hydrophobicity belonged to the TSA, verified by the biggest contact angles of 155°. Thus, all these indicated that the properties of the three SAs were deeply related to the quantity of Si–Cl and Si–CH 3 groups in MCS.
Graphical abstract
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2908-2915
·
IF 3.665
Shuai Wen,Qiang Liu,Wentian Liang
The linear benzyl chlorine-free poly(4-acetoxystyrene) (PSTO) with low polydispersity ( M w / M n = 1.3) is obtained through anisole quenching of the living polymerization of 4-acetoxystyrene initiated with the St–Cl/SnCl 4 /n-Bu 4 NBr system in CH 2 Cl 2 . The alkylation reaction rate increases with increasing anisole concentration and temperature. With a 4-fold excess of anisole over the initiator, end-chlorine groups are completely capped by anisole in 30 minutes at −15°C through adding extra SnCl 4 prior to the alkylation reaction. In addition, by using 2-methylanisole and 2,6-dimethylanisole as capping agents, it is verified that both para- and ortho-positions substitution of living PSTO cations to the anisole occur during alkylation reactions.
研究领域:
高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Haoran Sun,Wanzhong Yin,Bin Yang,Keqiang Chen,Qiuyue Sheng
The flotation performances of magnesite and quartz were investigated in this work using N-hexadecyltrimethylammonium chloride (HTAC) as a collector. Micro-flotation tests were performed in a pilot study, and the results demonstrated that HTAC had high selective collection ability to quartz. Further, batch flotation results showed that HTAC could effectively remove quartz from magnesium-bearing carbonate ores. The adsorption behaviors of HTAC onto the surfaces of two minerals were analyzed through zeta-potential measurements and X-ray photoelectron spectroscopy (XPS) detection, which revealed that HTAC was mainly adsorbed on quartz rather than magnesite. Thus, HTAC could be used as a high-selectivity collector to efficiently separate magnesite from quartz.
研究领域:
矿物加工工程
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材料科学与工程
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Lu Wang,Qiong Liu,Baoxian Ye
This paper reports on the first electrochemical investigation of glabridin . Under hydrothermal conditions, poly(diallyldimethylammonium chloride) (PDDA) was attached to a graphene (GR) surface via a noncovalent reaction. Moreover, the morphology and structure of PDDA-GR were characterized by transmission electron microscopy (TEM), Fourier transform-infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) analysis. Based on the nanocomposite, a (PDDA-GR/GCE) sensor was prepared, which showed a significant voltammetric response to glabridin. A simple voltammetric method for the investigation of glabridin with a wide concentration range (6.0 × 10 −8 mol L −1 –6.0 × 10 −6 mol L −1 ) and a low detection limit (2.0 × 10 −8 mol L −1 ) was proposed. The kinetic parameters were calculated, and the reaction mechanism of glabridin was obtained. Additionally, when employed for the analysis of real-life samples, the proposed method showed high accuracy and selectivity.
研究领域:
分析化学
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电化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 2
·1384-1391
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IF 2.019
Du Zoufei,Guo Ronghui,Lan Jianwu,Tan Lin,Jiang Shouxiang,Cheng Cheng,Zhao Ludan
In this study, a visible-light-driven photocatalyst Bi 2 WO 6 was assembled on fibers by linking of poly(diallyldimethylammonium chloride) (PDDA) at room temperature. The samples were characterized by scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction. Photocatalytic activity was evaluated by degradation of Rhodamine B (RhB) and Acid orange 7 (AO7) under visible light irradiation. Effects of concentration of PDDA in the pretreatment solution on degradation efficiency of RhB and AO7 in the presence of Bi 2 WO 6 coated cotton fabrics were investigated. In addition, washing durability and breaking strength of Bi 2 WO 6 coated cotton fabrics modified with PDDA were examined. The results revealed that Bi 2 WO 6 with irregular shape were successfully coated on the cotton fabric modified with PDDA. Bi 2 WO 6 coated cotton fabric modified with PDDA exhibited excellent photocatalytic activity with degradation efficiency of 97.4% of RhB and 94.5% of AO7, respectively. In addition, Bi 2 WO 6 coating on the cotton fabrics modified with PDDA not only improved washing durability but also enhanced breaking strength of the fabric.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Siming Shen,Wenyan Zhao,Yumin Liu,Zhiyang Jv,Anita Achiamaa Bonsu,Liangping Zhu,Wenying Jiang,Kun Li,Shaojian Fu,Pengzhang Li,Hongshi Li,Changan Wang,Zhipeng Xie,Chuanjin Tian
Carbon-based perovskite solar cells (C-PSCs) hold great prospects for commercialization due to their lower manufacturing cost and better stability when compared with metal electrode perovskite. Nevertheless, their power conversion efficiency (PCE) is lower than those of metal-based perovskite solar cells because of the inadequate interface contact between the carbon electrode and the perovskite layer. In this study, the hole transport layer (HTL)-free carbon-based perovskite configuration is utilized to further reduce the cost, and the methylammonium chloride (MACl) additive is introduced to passivate the defects of the perovskite and enhance the interface contact performance. The results indicate that the MACl additive can improve the crystal quality of the perovskite film, reduce the density of defect states, fill the vacancies of the iodide ion, and inhibit the formation of the δ-phase. The optimized C-PSC exhibits an increased carrier lifetime, resulting in improved stability and PCE, with a champion efficiency of 18.04%. Additionally, the device demonstrates ultrahigh photoelectrical stability during continuous light illumination. The unpackaged device with the MACl additive retained 80% of its initial PCE after being operated for 1000 h under double 85 conditions (i.e., at 85 relative humidity (RH) and 85 °C). This work provides an extremely effective strategy for optimizing the interface contact of carbon-based perovskites and preventing the formation of the δ-phase, thereby leading to more efficient and stable optoelectronic devices.
研究领域:
材料科学
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能源技术
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光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Song Wang,Lantian Su,Lumei Wang,Dongwei Zhang,Guoqing Shen,Yun Ma
This paper proposes the idea of establishing carbendazim (CBZ) colorimetric determination in spiked water samples by specific aptamers of unlabeled carbendazim (CBZ), gold nanoparticles (AuNPs) and cationic polymer poly-diallyldimethylammonium chloride (PDDA). In the absence of CBZ, the CBZ aptamer will react with the cationic polymer PDDA by electrostatic interaction to form a complex structure. Therefore, the gold nanoparticles will remain dispersed due to the lack of PDDA. However, when CBZ is added into the sensory system, the CBZ-specific aptamer can selectively capture CBZ to form a stable complex structure. Due to the consumption of the aptamer, PDDA is unable to interact with the aptamer and begins to induce aggregation of AuNPs, thereby causing the color of the solution to change from red to blue. Colorimetric determination of CBZ based on the specific recognition of aptamer and the PDDA-induced aggregation of AuNPs has a detection limit of 2.2 nM, a linear range (R = 0.9960) from 2.2 to 500 nM. The method has good sensitivity and specificity, and the average recovery of CBZ is 94.9–104.8% in the application of actual water samples. This colorimetric method is simple, time-saving and low requirements for equipment, therefore, it holds great potential for CBZ detection in the environmental water samples.
研究领域:
环境科学
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分析化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 13
·7677-7689
·
IF 4.21
Zhuo Longhai,Ma Cong,Xie Fan,Chen Shanshan,Lu Zhaoqing
Polyimide (PI) aerogels have great potential in oil/water separation field, but the extreme volume shrinkage during the fabrication still remains challenging. Herein, a simple yet efficient strategy of incorporating methylcellulose (MC) in PI aerogels is proposed. The MC/PI composite aerogels were fabricated by freeze-drying plus thermal imidization with subsequent trimethylchlorosilane (TMCS) functionalization. The results revealed that MC entered the skeleton of aerogels and strengthened it effectively by promoting the formation of robust and complete 3D porous structure, and the defects of as-prepared aerogels were eliminated when the proportion of MC was beyond 10 wt%. After modification with TMCS, the water contact angle of aerogels increased significantly by 30°–40°, and the functionalized aerogels showed excellent oil absorption capacity up to 28.44 g/g. The outstanding oil absorbency and simple process for separating oil and water with MC/PI composite aerogels are promising candidates in the field of oil/water separation.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 18
·8592-8600
·
IF 3.925
Jingjing Yao,Xinxin Xu,Haiying Liu,Liguang Xu,Liqiang Liu,Hua Kuang,Chuanlai Xu
Here, we describe a sensitive and rapid gold nanoparticle-based immunochromatographic strip (GNP-ICS) for the detection of dimethachlone (DMT) in tomatoes and lettuces using GNP-labeled monoclonal antibodies (mAbs) as the probe. Anti-DMT mAbs (1F4) were produced using two haptens and identified by heterologous indirect competitive enzyme-linked immunosorbent assay (icELISA) and had a half maximal inhibitory concentration (IC50) and limit of detection (LOD) of 2.84 ± 0.07 and 0.67 ± 0.01 ng mL−1, respectively. The developed GNP-ICS assay showed high sensitivity and specificity for the detection of DMT with a cut-off and visual limit of detection (vLOD) of 40 and 5.0 ng mL−1, respectively. Furthermore, the application of these developed immunoassays for the determination of DMT-spiked tomato and lettuce samples was validated by liquid chromatography tandem mass spectrometry (LC-MS/MS) and we found that our developed GNP-ICS assay was suitable for the detection of DMT in real samples.
研究领域:
食品科学
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分析化学
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植物保护
✓ 已验证
产品关联
DOI
高影响因子
Journal of Natural Gas Science and Engineering
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2021
·
IF 4.965
Xuejian Liu,Quan Cao,Dongyan Xu,Shengjun Luo,Rongbo Guo
The maximum methane storage capacity (MSC) is of critical importance of methane hydrate to store methane. This paper reports the effects of vesicle solutions, formed through combination of carboxylate surfactants with cationic quaternary ammonium salt including hydroxypropyl trimethyl ammonium chloride chitosan (HACC) or dodecyl trimethyl ammonium chloride (DTAC), on the formation of methane hydrate. It was found that vesicles could raise the maximum MSC of hydrate by about 10 (V/V, the volume of methane stored by one volume of hydrate) at appropriate anion and cation concentrations. For example, at 800 ppm (parts per million) of sodium laurate (SL) and 600 ppm of HACC concentrations, the formed vesicles could elevate the maximum capacity to 151 V/V, 5.3% higher than that of sodium laurate alone. The vesicles formed could increase the maximum MSC, from 136 V/V to 147 V/V by sodium oleate (SO) and HACC, 145 V/V to 153 V/V by sodium decanoate (SD) and HACC and 137 V/V to 149 V/V by SO and DTAC. The reason for the enhancement is that the large hydrophobic space of the vesicles could solubilize methane molecules and facilitate them to contact with water molecules.
研究领域:
化学
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材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 17
·8360-8375
·
IF 11.301
Shuai Xu,Ming-Hui Huang,Tao Li,Zhi-Quan Wei,Xin Lin,Xiao-Cheng Dai,Shuo Hou,Xiao-Yan Fu,Fang-Xing Xiao
Modulating photo-induced charge separation/transfer constitutes a central challenge in heterogeneous photocatalysis. Despite advancements in this area, finely tuning directional electron migration without involving conventional co-catalysts [e.g., metal nanocrystals and transition metal dichalcogenides (TMDs)] for boosted photoredox catalysis has not yet been explored. Herein, we report the exquisite design of a novel and general macromolecule-modulated photoredox selective organic transformation system, wherein an ultrathin macromolecular poly(diallyldimethylammonium chloride) (PDDA) layer was integrated at the interface of wide-band-gap (WBG) and narrow-band-gap (NBG) semiconductors to construct heterostructured photocatalysts. The ultra-thin PDDA interim layer expedites interfacial unidirectional electron transfer from the NBG to WBG semiconductor, resulting in a cascade electron transfer channel. The favorable energy level alignment among the building blocks, intimate interfacial integration and multilayered nanoarchitecture endow the WBG@PDDA@NBG heterostructures with substantially enhanced and versatile photoredox performance toward the selective oxidation of aromatic alcohols to aldehydes and the anaerobic reduction of nitroaromatics to amino compounds under visible light irradiation. This can be ascribed to the crucial role of the ultrathin intermediate PDDA layer as a highly efficient metal and TMD-free charge transfer mediator, relaying the electrons from the NBG to WBG semiconductor and slowing charge recombination. Our work could open up new frontiers to exploit diverse metal and TMD-free photocatalytic systems and provide a first insight into the fine tuning of charge transport utilizing non-conductive ionic polymers for solar energy conversion.
研究领域:
化学
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材料科学
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能源科学
✓ 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）