JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2021
·
IF 2.262
Li Chao,Haiwang Wang,Xinfang Wei,Jinlong Li,Cheng Ji,Xiwei Qi
At present, the polymer flocculation technology has been widely used in the treatment of oil sand tailings. However, the current composite flocculant still has the problems of low flocculation efficiency and serious secondary pollution after using. In this article, cationic composite flocculant SiO2-TiO2-P(AM-DMC) with self-degrading characteristics was prepared by the surface photoinitiated polymerization technique. Above all, in order to study the synthesis process of SiO2-TiO2-P(AM-DMC), cationic composite flocculant was characterized by FTIR, TG, TEM, XPS, etc. Furthermore, the central composite design (CCD) and response surface methodology (RSM) were used to optimize the preparation parameters of the cationic composite flocculant. And the optimization results of preparation parameters of cationic composite flocculant showed that the optimal preparation parameters of SiO2-TiO2-P(AM-DMC) were as follows: mDMC: mAM = 5, monomer concentration was 35% and reaction time was 100 min. Ultimately, the flocculation parameters of SiO2-TiO2-P(AM-DMC) were optimized by CCD and RSM. Moreover, the optimization results of flocculation parameters of cationic composite flocculant showed that the optimal flocculation parameters of SiO2-TiO2-P(AM-DMC) were as follows: pH = 5, flocculant dosage was 30 ppm, kaolin concentration was 1.36%. In summary, this work had greatly enriched the knowledge of oil sand tailings treatment, and had the extremely important reference significance for realizing the parameter regulation of high-efficiency flocculation of oil sand tailings.
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ACS Applied Nano Materials
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2021
·
IF 5.097
Xiuju Wu,Rongfei Wang,Wei Li,Bomin Feng,Weihua Hu
Precious metal phosphides have attracted considerable research interest for electrocatalysis in recent years, but it remains an open question how to design such electrocatalysts to facilitate the gas-evolving water electrolysis with high activity and durability at low metal loading. In this work, rhodium phosphide nanoparticles are attached on a nitrogen/phosphorus-doped carbon cloth matrix (Rh2P-N/P-CC) with an ultralow Rh loading of 39.2 μg cm–2 to be used as an excellent bifunctional electrocatalyst for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). By rationally integrating the merits of its two components, as-reported Rh2P-N/P-CC exhibits impressive HER catalytic performance, outperforming benchmark Pt/C catalysts at only 7.85% equivalent of Pt; meanwhile, Rh2P-N/P-CC largely surpasses the RuO2 catalyst during OER catalysis in alkaline media. As a bifunctional electrocatalyst, Rh2P-N/P-CC catalyzes stable electrochemical water splitting of 200 mA cm–1 under 1.7 V. This work reports a feasible strategy to integrate three-dimensional electrodes for high performance water electrolysis.
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CARBOHYDRATE POLYMERS
·
2021
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IF 9.381
Shaoxiang Lee,Meng Zhang,Guohui Wang,Wenqiao Meng,Xin Zhang,Dong Wang,Yue Zhou,Zhonghua Wang
In this paper, polyvinyl alcohol/starch composite films with p-coumaric acid modified chitosan (P-CS) and chitosan nanoparticles (P-CSNPs) at different concentrations were successfully prepared. The films were compared for their mechanical, thermal, physical, antioxidant, antibacterial, cytotoxicity and optical barrier properties. The results suggested that P-CS could significantly increase the tensile strength (TS) of the film from 15.67 MPa to a maximum of 24.32 MPa. The compact structure of P-CSNPs film prevented water diffusion, reducing the water amount within. Both films showed a reduction in water solubility, the extent of swelling, and water vapor transmittance. Specifically, P-CSNPs films showed better thermal stability while P-CS films revealed higher antioxidant activity. Besides, the P-CS films exhibited excellent transparency and good ultraviolet-barrier at 200−280 nm. P-CSNPs films demonstrated higher antibacterial activity on both Gram-negative and Gram-positive bacteria. Additionally, P-CS films were less cytotoxic compared to P-CSNPs films.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Zhaoqian Yan,Zhihao Sun,Kaicheng Yue,Anran Li,Lei Qian
Owing to high theoretical capacity and low voltage platforms as anode materials for lithium ion batteries (LIBs), transition metal phosphides (TMPs) have received considerable interest. However, the immense volume change during lithiation/delithiation process and poor electrical conductivity have greatly limited their applications. To overcome above shortcomings, constructing stable nanocomposites containing two-dimensional carbon and TMPs is extremely important. Herein, via chitosan as the carbon precursor, an original two-dimension nanocomposite of Ni 2 P nanoparticles immobilized N, P co-doped porous carbon nanosheets (Ni 2 P/NP-PC) through one-pot high temperature annealing process was proposed as anodes for LIBs. The microstructure verified that Ni 2 P/NP-PC had plentiful superiorities of numerous microporous channels, surface defects and large specific surface areas, which accelerated lithium ions migration and provided affluent active sites for lithium ions. Meanwhile, robust carbon nanosheets doped by N and P atoms increased ionic/electrical conductivity and released the volume expansion of Ni 2 P. Furthermore, the Ni 2 P/NP-PC exhibited exceptional specific capacity (879 mA h g −1 at 0.1 A g −1 after 100 cycles) and good cyclic performances (423.3 mA h g −1 at 2.0 A g −1 after 1700 cycles). It is expected that the facile method can be popularized to synthesize other TMPs composites for more energy storage systems.
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Energy Technology
·
2021
·Vol. 10
·期 1
·2100259
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IF 3.631
Ka Yang,Gang Cheng,Rong Chen,Kai Zhao,Ying Liang,Weijie Li,Chao Han
Developing an efficient photocatalyst for solar-to-hydrogen production is regarded as a promising approach to tackle the energy and environmental challenges that we are currently facing. Herein, the TiO 2 –Cu 2 O nanocomposite is synthesized via a chemical reduction approach at ambient temperature and used as a photocatalyst. The composition and structure characterizations indicate that Cu 2 O particles are loaded on the surface of TiO 2 nanospheres. The photocatalytic performance of the as-obtained materials is evaluated by a solar-to-hydrogen production test. It is found that the optimized TiO 2 –Cu 2 O nanocomposite (TC-20) exhibits a hydrogen evolution rate of 7139.02 μmol g −1 h −1 , which is nearly 7 times that of pristine TiO 2 . Based on the photoluminescence spectra and photo/electrochemical measurements, the boosted photocatalytic H 2 evolution performance comes from the promoted separation efficiency of photoinduced electron–hole pairs, which originates from the formed p–n heterojunction of the TiO 2 –Cu 2 O nanocomposite.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 30
·16565-16574
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IF 12.732
Hanfang Zhang,Zhensheng Chen,Yihe Zhang,Zequn Ma,Yingge Zhang,Liqi Bai,Li Sun
Zinc-ion hybrid capacitors (ZHC) are promising new types of energy storage devices that combine many advantages of supercapacitors and batteries. However, the bottlenecks of low energy density and inferior cyclic stability urgently need to be addressed, and constructing advanced cathode materials is a feasible and effective strategy to overcome this barrier. Herein, we report a ZHC with enhanced performance obtained by incorporating N and P heteroatoms into cross-linked porous carbon nanosheets (CNPK) for promoting the Zn-ion adsorption. The ex situ XPS results during the charging and discharging processes proved the existence of –OH and Zn2+ chemical adsorption. Theoretical simulations revealed that the doping of N and P atoms can weaken the energy barrier of the reaction between the cathode and Zn2+; graphitic nitrogen and graphitic phosphorus are particularly significant for the reduction of the reaction energy barrier. Consequently, CNPK exhibited a high capacitance of 233 F g−1 at 0.5 A g−1 and low equivalent series resistance. The assembled aqueous ZHC demonstrated a capacity of 103.2 mA h g−1 (232.2 F g−1) at 0.1 A g−1, energy density of 81.1 W h kg−1, power density of 13.366 kW kg−1, and an excellent cyclic stability of 101.8% capacitance retention after 10 000 cycles in ZnSO4 electrolyte. A quasi-solid-state ZHC was assembled to verify the practical application, which delivered a high capacity of 141.0 mA h g−1 at 0.1 A g−1 and a remarkable energy density of 89.3 W h kg−1. This work opens the door to the study of porous carbon materials for high-performance ZHCs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Hao Liu,Ya-nan Qin,Hao-yu Li,Li-xue Gai,Qing-da An,Shang-ru Zhai,Zuo-yi Xiao,Li Cui
Noble metal-based catalytic material with maximum utilization is of prime attraction for conserving rare metal resources. Herein, highly dispersion Ni nanoparticles (NPs)-modified N-doped mesoporous carbon material (Ni-N@C) was fabricated by pyrolysis of Ni 2+ /Histidine cross-linked alginate hydrogels. In a step forward, the obtained Ni-N@C nanocatalyst was treated by the solution of Pd 2+ , and tiny amount of Pd NPs were deposited on the surface of Ni via the reducibility of Ni to achieve the high dispersion of precious metals material. In the degradation of highly-concentration p-nitrophenol, the catalyst presents excellent performance which could completely degrade pollutants within a very short period. It was demonstrated that pre-embedded Ni NPs could not only increase the efficiency of Pd NPs but also endow the facile separation characteristic to the catalyst. Besides, the catalyst maintained favorable catalytic capacity even after five reaction cycles. In brief, this work may provide novel guidance for the maximum utilization of noble metal-modified mesoporous N-doped carbon-supported catalysts in practical applications of industrial and the treatment highly-concentration p-nitrophenol.
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ENVIRONMENTAL ENGINEERING SCIENCE
·
2020
·Vol. 37
·期 4
·263-271
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IF 1.681
Wei Li,Xinglong Fan,Baoxia Liu,Yue Zhang,Lixiang Zhou,Yeqing Lan
In this study, microscale zinc–copper (mZn/Cu) bimetallic particles were prepared through precipitating Cu on the surface of Zn and applied in the degradation of p-nitrophenol (PNP). To optimize reaction conditions, three control parameters, including reciprocating speed, mZn/Cu dosage, and PNP concentration, were investigated by the central composite rotatable design coupling with response surface methodology. To further evaluate the catalytic activity of mZn/Cu, the removal of PNP and total organic carbon (TOC) were compared in different systems. It is found that the removal of TOC by mZn/Cu, mFe/Cu, mZn, mFe, mCu, and mZn + mCu was 77%, 41%, 5%, 7%, 19%, and 9%, respectively. The maximum mineralizing of PNP was realized in the system of mZn/Cu/PNP, suggesting that PNP mainly underwent oxidative degradation. Furthermore, these results also indicate that PNP was basically reduced in the presence of mZn, mFe, and mZn + mCu. The mechanism investigations via florescence spectroscopy and free radical scavengers reveal that •OH generated from Fenton-like reaction was responsible for the decomposition of PNP by mZn/Cu. Based on the analyses of intermediates detected by liquid chromatography-mass spectrometry, the possible degradation pathways of PNP are proposed. In summary, mZn/Cu bimetallic particles are a potential approach to degrade PNP under aerobic condition.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 6
·e5612
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IF 3.14
Na Zhang,Jiaqi Bu,Yong Meng,Jia Wan,Lu Yuan,Xin Peng
In this study, Ti-Si-Sn-Sb/GAC particle electrodes were prepared by sol–gel method. The particle electrodes were characterized by SEM, XRD, EDX, and BET then used to carry out three-dimensional (3D) electrocatalytic oxidation degradation on simulated refractory p-aminophenol (PAP) wastewater. The effects of initial pH, cell voltage, aeration flow rate and initial PAP concentration on degradation experiments were investigated. Under the optimal conditions, the PAP and COD removal rates were 89.45% and 75.17% respectively. In addition, the possible degradation mechanism of PAP was further investigated by UV–Vis and HPLC. Finally, it was found that the Ti-Si-Sn-Sb/GAC particle electrodes with high catalytic activity and excellent stability could significantly improve the PAP wastewater removal efficiency.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
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IF 4.006
Jingna Liu,Yuanhong Zhuang,Yonghua Hu,Shan Xue,Hui Li,Lian Chen,Peng Fei
In this work, p- coumaric acid and caffeic acid were grafted on blueberry anthocyanins through enzyme catalysis method to improve their colour stability and antioxidant activity . The acylation degrees of p- coumaric acylated anthocyanins (Co-An) and caffeic acid anthocyanins (Ca-An) reached 5.38% and 5.68%, respectively. The results from Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, ultraviolet visible spectroscopy and hydrogen nuclear magnetic resonance implied that p- coumaric acid and caffeic acid grafted on the 6-OH of glucoside and galactoside and the 5-OH of arabinose through esterification reaction. As revealed in the in vitro experiment on antioxidation activity and the experiment on colour stability, Co-An and Ca-An showed stronger antioxidant activity in DPPH assay and β-carotene bleaching assay and higher colour stability during storage at 25 °C, 40 °C and 60 °C than native blueberry anthocyanins.
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RSC Advances
·
2020
·Vol. 10
·期 51
·30756-30766
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IF 3.119
Zhentao Bian,Chunjie Wu,Chenglong Yuan,Ying Wang,Guangzhen Zhao,Hongyan Wang,Yong Xie,Cong Wang,Guang Zhu,Chong Chen
In recent years, multi-heteroatom-doped hierarchical porous carbons (HPCs) derived from natural potential precursors and synthesized in a simple, efficient and environmentally friendly manner have received extensive attention in many critical technology applications. Herein, bean worms (BWs), a pest in bean fields, were innovatively employed as a precursor via a one-step method to prepare N–O–P–S co-doped porous carbon materials. The pore structure and surface elemental composition of carbon can be modified by adjusting KOH dosage, exhibiting a high surface area (SBET) of 1967.1 m2 g−1 together with many surface functional groups. The BW-based electrodes for supercapacitors were shown to have a good capacitance of up to 371.8 F g−1 in 6 M KOH electrolyte at 0.1 A g−1, and good rate properties with 190 F g−1 at a high current density of 10 A g−1. Furthermore, a symmetric supercapacitor based on the optimal carbon material (BWPC1/3) was also assembled with a wide voltage window of 2.0 V, demonstrating satisfactory energy density (27.5 W h kg−1 at 200 W kg−1) and electrochemical cycling stability (97.1% retention at 10 A g−1 over 10 000 charge/discharge cycles). The facile strategy proposed in this work provides an attractive way to achieve high-efficiency and scalable production of biomass-derived HPCs for energy storage.
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ChemSusChem
·
2020
·Vol. 14
·期 1
·456-466
·
IF 7.962
Huifa Zhang,James H. Clark,Tong Geng,Huixian Zhang,Fahai Cao
Graphical A new world for carbon : Phosphorus and nitrogen co-doped carbon (P−C−N) catalyst demonstrates a superb catalytic activity towards selective aerobic oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-diformylfuran (DFF). A newly designed N and P co-doped carbon material has been developed to catalyze the conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandialdehyde (DFF) with unprecedented yield and selectivity and demonstrating a synergistic effect between the heteroatoms. The desired catalyst was first synthesized via a pyrolysis method using urea as the nitrogen and carbon source followed by calcination with phytic acid solution as the phosphorus source. The mass ratio of phytic acid to C 3 N 4 and calcination temperature were varied to investigate their effects on catalyst synthesis and microstructure as well as subsequent catalytic activity in simple reaction systems under oxygen. The effect of reaction conditions on the final HMF conversion and DFF selectivity were also investigated systematically. The P−C−N-5-800 catalyst obtained with the optimized annealing temperature of 800 °C and mass ratio of phytic acid/C 3 N 4 of 5 enabled a 99.5 % DFF yield at 120 °C for 9 h under 10 bar oxygen pressure, being the highest among any reported metal-free heterogeneous catalyst to date. The excellent performance of P−C−N-5-800 could be ascribed to the synergy between N and P heteroatoms as well as the high content of graphitic-N and the P−C species within the carbon structure. Reusability studies show that the P−C−N-5-800 catalyst was stable and reusable without deactivation. These results strongly suggest that P−C−N-5-800 is a promising catalyst for large-scale production of DFF in a green manner.
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