COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Wenjie Zou,Zichuan Fang,Jun Huang,Zhijun Zhang
Solution salinity is critical for the inhibition effect of sodium hexametaphosphate on different mineral surfaces, further affecting the separation of minerals in aqueous solution. In this work, the effect of K + and Ca 2+ on adsorption of sodium hexametaphosphate (SHMP) and hydrophobically modified polyacrylamide , poly(AM-NaAA-C 16 DMAAC) (HMPAM), on alumina surface (i.e., kaolinite Al-OH surface) were investigated using quartz crystal microbalance with dissipation (QCM-D). The deposition layer on alumina surface with the effect of adding 1 mM SHMP in 10 mM of CaCl 2 solution were examined by glancing angle X-ray diffraction (GAXRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The 100 mM KCl solution promoted the adsorption of both HMPAM and SHMP on alumina surface, which would be mainly caused by the molecular configuration change. The more flexible and coiled configuration of HMPAM and SHMP in 100 mM KCl solution could be helpful for increasing the adsorption sites on alumina surface. Moreover, the intermolecular hydrophobic interaction between the alkane chains of HMPAM would lead to the multilayer adsorption of HMPAM instead of adsorbing directly onto alumina surface. Alternatively, 1 mM and 10 mM CaCl 2 solutions lead to a lower adsorption amount of HMPAM on alumina surface, which is most likely caused by the suppressed electrostatic attraction and condensed conformation of HMPAM. The adsorption layer of SHMP formed on alumina surface could prevent the adsorption of HMPAM through different mechanisms in KCl and CaCl 2 solutions at different concentrations. Interestingly, scattered micro-spheres were found to adsorb on alumina surface with 1 mM SHMP in 10 mM CaCl 2 solution, mainly in forms of calcium hydrogen phosphate hydrate. Our work provides fundamental insights into the effect of adding dispersant (e.g., SHMP) and polymer flocculant (e.g., HMPAM) during selective flocculation of kaolinite , with helpful guidance for clay-involved mineral processing.
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Hongjun Fang,Yusong Pan,Minyun Yin,Linfeng Xu,Yuan Zhu,Chengling Pan
Ternary Ti 3 C 2 –OH/ln 2 S 3 /CdS composites with an efficient visible-light-driven photocatalytic performance have been prepared via a facile hydrothermal synthesis method. The photo-degradation experiments verified that Ti 3 C 2 –OH/ln 2 S 3 /CdS composite with a large surface area of 68.2 m 2 /g exhibited an enhanced photocatalytic activity and adsorption capacity towards Rhodamine B under visible light irradiation , which was higher than that of the naked CdS and ln 2 S 3 , respectively. Furthermore, Ti 3 C 2 –OH/ln 2 S 3 /CdS composite showed robust degradation efficiency for mixture dyes of RhB and Methyl Orange (MO), and its catalytic ability was superior to that of ternary GO/ln 2 S 3 /CdS composite. The trapping experiments for active species revealed that hole (h + ) and • O 2 − species played a critical role in the removal of organic pollutants. In summary, the enhanced photocatalytic performance of Ti 3 C 2 –OH/ln 2 S 3 /CdS photocatalyst was derived from an excellent charge carrier separation and transfer of Ti 3 C 2 –OH MXene and the synergistic effect between CdS and ln 2 S 3 which resulting in strong visible light response.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yufeng Bai,Huizhi Yang,Lili He,Chunhua Ge,Renchang Zhai,Xiangdong Zhang
As electronic device integration and power density increase, materials must have brilliant microwave absorption properties and thermal conductivity to solve electromagnetic wave pollution and thermal management problems. In this work, we attempt to construct core-shell hydroxylated boron nitride nanosheets (BN-OH) @Fe 3 O 4 @PAn (BFeA) nanocomposites by chemical synthesis and in-situ growth design. The excellent magnetic properties of Fe 3 O 4 and the good electrical conductivity of PAn can form magnetic loss and electrical loss centers to play a synergistic effect in improving microwave absorption capacity. Meanwhile, with the wave-transmitting material BN-OH as the core, the electromagnetic waves can be reflected multiple times within the absorber, which further enhances the microwave absorption capability of BFeA. As a result, the minimum reflection loss (RL min ) of the composites can reach − 49.85 dB at 11.36 GHz, and the effective microwave absorption bandwidth (RL<−10 dB, EAB) is close to 8 GHz (8.5–16.5 GHz) at a thickness of 3 mm. Simultaneously, to improve the thermal conductivity (TC) of the BFeA and reduce the interfacial thermal resistance, we use hydroxyl and dopamine as the interface linking agent at the interfaces of BN-OH and Fe 3 O 4 , and Fe 3 O 4 and PAn, respectively. In this case, the TC of BFeA-2 reaches 0.98 W (m K) −1 at a total BN–OH content of only 13 wt. %, nearly 4 times that of the raw material (Fe 3 O 4 ). This work can provide a reference for developing materials with dual functions of thermal management and microwave absorption.
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RESEARCH ON CHEMICAL INTERMEDIATES
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2026
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IF 3.3
Ma Yong-hu,Ma Fu,Zhao Tiao-bin,Gao Zi-yi,La Ying-hong,Zhao Hong-jian
Limited interfacial charge separation efficiency and insufficient redox capacity severely hinder the practical application of conventional Bi 2 WO 6 -based photocatalysts. To address these issues, a novel Bi(C 2 O 4 )OH/Bi 2 WO 6 heterojunction was constructed via a facile room-temperature one-pot liquid-phase deposition method. Multiple characterizations confirm the intimate interfacial contact between Bi(C 2 O 4 )OH nanorods and uniformly anchored Bi 2 WO 6 nanoparticles, accompanied by the introduction of abundant oxygen vacancies. On the basis of radical trapping experiments, EPR measurements, and electrochemical tests, an S-scheme charge-transfer model is proposed. This model retains the strong redox potentials of both semiconductors, while oxygen vacancies are speculated to act as efficient interfacial charge-trapping and transfer sites to synergistically promote the migration and separation of photogenerated carriers. The optimized 7%Bi(C 2 O 4 )OH/Bi 2 WO 6 composite achieves an RhB removal efficiency of 97.6% within 60 min for 50 mL of RhB solution (30 mg·L -1 ) under 5-W LED lamp irradiation. Radical trapping and EPR tests confirm that ·O 2 - , h⁺, and ·OH are the dominant active species. This work presents a facile and efficient room-temperature fabrication strategy for Bi-based heterojunctions and systematically elucidates the synergistic promotion mechanism between oxygen vacancies and the proposed S-scheme charge-transfer pathway, offering new insights for designing high-performance photocatalysts for organic wastewater remediation.
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Journal of Materials Chemistry A
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2023
·Vol. 12
·期 2
·1003-1011
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IF 11.9
Zhili Chang,Boyong Ye,Zixin Zhong,Songlin Wang,Han Wang,Weichen Du,Zhaoyin Hou
The synthesis and fabrication of new layered double hydroxide (LDH) materials are of great importance because of their versatility in catalysis, biosensors, supercapacitors, drug delivery and adsorption. In this work, Cu1Mg3Sc2(OH)12CO3 LDH and its derived Cu1/Mg3Sc2O6 catalyst with Sc3+ as the trivalent ion were synthesized for the first time. The composition and fine structure of Cu1Mg3Sc2(OH)12CO3 LDH and Cu1/Mg3Sc2O6 catalysts were characterized in detail. It was found that Cu1Mg3Sc2(OH)12CO3 LDH possesses larger cell parameters a (0.3170 nm) and c (2.3073 nm) than Cu1Mg3Al2(OH)12CO3. And the final Cu1/Mg3Sc2O6 catalyst possesses an enlarged surface area (260.8 m2 g−1), enhanced basicity (550 μmol g−1) and weaken acidity compared with those of Cu1/Mg3Al2O6. Finally, the Cu1/Mg3Sc2O6 catalyst was tested in the hydrogenation of waste polyethylene terephthalate (PET) derived dimethyl 1,4-cyclohexanedicarboxylate (DMCD) to 1,4-cyclohexanedimethanol (CHDM). It was found that the Cu1/Mg3Sc2O6 catalyst was highly active and selective for the conversion of DMCD to CHDM with 96.3% yield under mild conditions (250 °C, 2 MPa and WHSVDMCD = 0.49 h−1). And it can retain its performance for 300 h.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Qinglin Sheng,Duo Liu,Jianbin Zheng
In this paper, a sensitive novel non-enzymatic nitrite electrochemical sensor based on Pt nanoparticles loaded Ni(OH) 2 /Multi-Walled Carbon Nanotubes nanocomposites (Pt/Ni(OH) 2 /MWCNTs) was described. The composition and morphology of the Pt/Ni(OH) 2 /MWCNTs were characterized by transmission electron microscope and investigated energy dispersive X-ray spectra respectively. Results showed that the Pt nanoparticles could be anchored on the surface of the Ni(OH) 2 /MWCNTs uniformly through a simple reduction process. The electrochemical investigation of the sensor revealed that the Pt/Ni(OH) 2 /MWCNTs exhibited remarkable electrocatalytic performance toward nitrite oxidation , with a sensitivity of 145 μA mM − 1 cm − 2 and a low detection limit of 0.13 mM. Moreover, the obtained Pt/Ni(OH) 2 /MWCNTs modified GCE with excellent reproducibility and selectivity also allows for practical application. It is expected that the combination of noble metal with Ni(OH) 2 /MWCNTs could be expanded to enhance the catalytic performances of nanocomposites and used for the construction of high-sensitive electrochemical sensors.
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DALTON TRANSACTIONS
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2023
·Vol. 52
·期 48
·18342-18353
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IF 4
Minghao Dou,Mengjie Yao,Kai Ding,Yuye Cheng,Hongyu Shao,Shenjie Li,Yanyan Chen
Heterostructures formed by combining semiconductor materials with different band structures can provide work functions, d-band positions and electronic properties different from bulk materials and are considered as an effective strategy to improve the catalytic activity through electronic modification. In this study, an efficient MoS2/Fe-Ni3S2/NF heterojunction material was prepared by a two-step hydrothermal method. With the help of flake Ni(OH)2 synthesized in the first step, growth sites were provided for flake Ni3S2. The electronic structure of Ni3S2 was optimized by Fe doping, while the construction of the MoS2/Fe-Ni3S2 heterostructure allowed the catalyst to expose more active sites. MoS2/Fe-Ni3S2/NF exhibited a small charge transfer resistance and excellent electrocatalytic performance. At a current density of 10 mA cm−2, only low overpotentials of 148 mV and 118 mV were required for the oxygen precipitation reaction (OER) and hydrogen precipitation reaction (HER), respectively. Notably, when MoS2/Fe-Ni3S2/NF is used as the anode and cathode for overall hydrolysis, only 1.51 V is required to reach a current density of 10 mA cm−2, demonstrating its great potential for application in hydrolysis. This work provides a feasible idea for the rational construction of non-precious metal bifunctional electrocatalysts with excellent performance.
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Chao Li,Tongtong Yun,Gaofeng Pan,Yehan Tao,Jie Lu,Jian Du,Haisong Wang
Structurally robust nanostructures on the surface of matrix highly determine the durability of superhydrophobic surface of cellulosic materials . Traditionally, the hydrophobic inorganic-organic nanocomposites were physically coated on the surface of cellulose fibers , whereas the nanocomposite was easy to fall off under external force due to the weak interfacial interaction between inorganic materials and cellulose, restricting their practical application. In this work, a sort of structurally stable superhydrophobic cellulosic materials was elaborately designed by successive in situ synthesis of Zn(OH) 2 nanoarchitectures and coating stearic acid (STA). The unique flower-like micro/nano structures as well as the presence of hydrophobic STA imparted the cellulosic materials with superhydrophobic behavior and the optimized water contact angle of synthesized STA@Zn(OH) 2 /paper nanocomposite was enhanced to 171°. Moreover, the resultant cellulosic nanocomposite also possesses excellent structural stability without STA and Zn(OH) 2 fall off as well as hydrophobicity reduction after bending 100 times. Compared to bare filter paper, both tensile stress and elongation at break of optimized flower-like nanocomposite reached 14.04 MPa and 25.24% with 109.6% and 323.5% improvement, respectively. Furthermore, such superhydrophobic cellulose-based material also presented excellent anti-fouling and antibacterial performances. This work proposed a facial and efficient strategy to construct structurally stable superhydrophobic cellulose-based materials, displaying great potential application in food packaging and outdoor anti-fouling fields.
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DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Xinyu Liu,Qianqian Fu,Zhichao Li,Hui Wang,Jianwei Ren
To address the growing demand for efficient and stable energy storage in the context of green energy, in this study, an acid etching method was employed to in-situ grow Ni(OH) 2 nanosheet arrays on a nickel foam (NF) substrate. Subsequently, negatively charged Ti 3 C 2 T x MXene nanosheets were electrophoretically deposited onto the Ni(OH) 2 /NF surface to result in a MXene/Ni(OH) 2 /NF composite electrode material. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations revealed the homogeneous dispersion distribution of nanosheets on the material surface. The composite material exhibited high electrical conductivity and good hydrophilicity by rapid water infiltration within 150 ms. Furthermore, the Motte-Schottky effect establishes a distinctive pathway for electron transfer , which leads to the creation of electron vacancies or ‘holes’ on the MXene surface. This phenomenon significantly boosts MXene's electrochemical activity and enhances its affinity for OH − ions in the electrolyte, which consequently improves the performance of electrochemical capacitors . Electrochemical tests verified that the prepared MXene/Ni(OH) 2 /NF electrode displayed an areal specific capacitance of 0.223 mAh cm −2 at a current density of 1 mA cm −2 . The electrode displayed excellent rate performance with a capacity retention rate of 71 % when the current density was increased by five times. In addition, the assembled asymmetric capacitor with MXene/Ni(OH) 2 /NF electrode demonstrated an excellent cycling stability with only a 16.38 % capacity loss after 5000 cycles. It also exhibited the remarkable specific capacitance and long-term stability by achieving a high energy density of 43.68 Wh kg −1 and a power density of 424.96 W kg −1 . These results highlight the electrode's exceptional performance in terms of energy storage and power delivery.
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Journal of Materials Chemistry A
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2023
·Vol. 12
·期 6
·3565-3574
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IF 11.9
Ling-Chan Tian,Geqian Fang,Yun Zhou,Wenjun Yu,Lin Li,Jin-Nian Hu,Haiyan Wang,Jin-Xia Liang,Chun Zhu,Xiaodong Wang,Jian Lin
Direct selective oxidation of methane (DSOM) to oxygenates under mild conditions is garnering increasing interest. UiO-66-H MOFs are effective for this reaction, while the active configuration of Zr-oxo nodes with adsorbed ˙OH species need further clarification from the atomic/molecular viewpoint. Here, we detect the evolution of the geometric and electronic structures of adsorbed oxygenic species on Zr-oxo nodes of UiO-66-H via the controlled ˙OH species. DFT calculations reveal a volcano-like curve relationship between the quantity of ˙OH species and the DSOM performance, which is further corroborated by experimental tests. Zroxo-˙OH is the main active configuration on Zr-oxo nodes of UiO-66-H at low ˙OH concentration, while it evolves to other oxygenic species (˙OOH, O2, and H2O) due to the self-reaction with the increase of ˙OH concentration, which leads to performance decrease. Furthermore, a critical descriptor of the p-band centers of O atoms in these oxygenic species on the Zr-oxo nodes is established, which can well represent the catalytic activity for the DSOM reaction.
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Materials Today Chemistry
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2023
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IF 7.3
Shiwei Feng,Chengping Zhang,Hengdao Quan
A facile, safe, and environmentally friendly preparation method is described for the synthesis of AlF x (OH) 3-x by the activation of γ-Al 2 O 3 using HCFO-1233zd( E ) under various temperatures. Comprehensive characterization techniques including XRD , XPS, N 2 sorption, SEM, TEM , 27 Al MAS NMR, FTIR, and py-IR were employed, revealing that at lower temperatures such as 275 °C and 300 °C, the synthesis yielded AlF(OH) 2 , while at higher temperatures like 350 °C and 375 °C, pyrochlore AlF 1.5 (OH) 1.5 and metastable hexagonal tungsten bronze-type (HTB) β-AlF 3 were formed, with α-AlF 3 detected at 325 °C. Notably, a significant quantity of AlF(OH) 2 can be obtained at 325 °C within a specific time frame. This amorphous phase exhibits weak Lewis acid sites and a lower acid density, rendering it significantly more effective in the isomerization of HCFO-1233zd( E ) compared to strong Lewis acid catalysts such as AlF 1.5 (OH) 1.5 and β-AlF 3 , which could promote coke formation, leading to catalyst deactivation . Moreover, due to its limited further fluorination at 290 °C, the optimal catalyst exhibits prolonged lifespan and high efficiency in HCFO-1233zd( E ) isomerization.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2023
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IF 3.8
Gaiqin Miao,Lifei Liu,Xia An,Xu Wu
In this work, a high-performance CuNiAl-LDHs catalyst was innovatively synthesized for electrochemical carbon dioxide reduction (CO 2 RR) of methanol (CH 3 OH) through the modulated synthesis of Cu-based layered double hydroxide (LDHs). It was found that the optimal CuNiAl-LDHs has superior CH 3 OH selectivity compared to CuAl-LDHs and CuMgAl-LDHs, with the Faraday efficiency (FE) of 76.4% for CH 3 OH generation at −1.2 V. And their FE and current density (4.8 mA·cm −2 ) remained stable during up to 24 h of electrolysis. Meanwhile, this study confirms the significant performance advantages of CuNiAl-LDHs over their derived composite oxides. Series characterization further proves that the excellent catalytic performance of CuNiAl-LDHs is importantly associated with their richness in Cu + and hydroxyl group (—OH). The research expands the application fields of LDHs compounds. Meanwhile, the series of discoveries provide a new insight for the preparation of CH 3 OH by constructing CO 2 RR.
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