Environmental Science-Nano
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2023
·Vol. 10
·期 10
·2744-2753
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IF 7.3
Jiaxin Lv,Ruixin Chen,Zhen Wu,Yang Bai,Han Song,Chen Tian,Mengye Wang,Zhang Lin
The enrichment of microplastics in polar ice is a typical phenomenon discovered in recent years. Thus, it is worthwhile to explore the degradation behavior of microplastics in frozen environments, which is crucial to evaluate their impact on polar ecosystems. Here, taking polystyrene (PS) as an example, the degradation behaviors of MPs in frozen anoxic Fe(II)-containing solutions were investigated. The results revealed that PS degradation rate in frozen solution was 14.6-fold higher than that in water. Mechanism study showed that freezing-induced aggregation and extrusion of PS enhanced the generation of environmentally persistent free radicals (EPFRs), which in turn contributed to the formation of H2O2. Moreover, freezing-induced enrichment of Fe(II) further interreacted with H2O2 to form Fe(IV) and OH free radicals at a pH of ∼6.5, and thus accelerated the degradation of PS. Such reaction was accompanied by the formation of Fe(III)-containing products, which would further react with aged PS to produce new EPFRs and Fe(II). Such cycles of aged PS/EPFRs and Fe(III)/Fe(II) continued to accelerate the degradation of PS in the frozen solution. This study provides an overlooked pathway for microplastic degradation in frozen Fe(II)-containing solutions, which would be of key importance to understand the degradation behaviors of microplastics in frozen environments.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
·
IF 4.2
Tongchen Zhang,Huan Wu,Matin Naghizadeh,Qian Zheng,Sheying Dong
Further improvement on the adsorption performance of microporous organic polymers (MOPs) by delicate design remains a challenge. Herein, a magnetic hydroxyl-functioned microporous organic polymer (Fe3O4/Hy-MOP) was prepared and characterized by a series of techniques, including transmission electron microscopy, vibration sample magnetometry, Fourier transform infrared spectrometry, thermal gravimetric analysis, and zeta potential analysis. As an adsorbent for ultrasound-assisted magnetic solid phase extraction of three personal care products (PCPs, triclosan, triclocarban, and 2-hydroxy-4-methoxybenzophenone), the obtained Fe3O4/Hy-MOP exhibited excellent performance in extracting three PCPs (89–95%) from water samples owing to its hydrophilicity, inherent microporous structure, and easy magnetic separation. Moreover, probing of adsorption behavior by triclosan upon Fe3O4/Hy-MOP surfaces demonstrated that the adsorption process followed the models of Freundlich isotherm, together with pseudo-second-order kinetics. The extraction and adsorption mechanism involved polar force, π–π interaction, and hydrophobic interaction between Fe3O4/Hy-MOP and PCPs. Particularly, the stability and magnetism of Fe3O4/Hy-MOP confer excellent cycling performance, allowing for five recycling iterations without a significant decrease in performance. Such results indicated that magnetic adsorbent Fe3O4/Hy-MOP has potential for application in the extraction and removal of PCPs from actual water samples.
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COMBUSTION AND FLAME
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2023
·
IF 4.4
Yuxiang Li,Kaili Zhang
Metastable intermolecular composites (MICs) comprising solid fuels and oxidizers at nano-scale exhibit high energy densities and fast reaction speeds. As most metal and metalloid fuels are passivated by the natural oxide layer on the surface which acts as a reaction barrier, fluorine-containing oxidizers are of particular interest to promote the reactivity through interfacial fluoridation. In this work, cobalt hydroxy fluoride (Co(OH)F) was introduced as a functional fluorine-containing oxidizer, and core-shell structured Co(OH)F@Al nanoarray was fabricated onto a glass substrate . The thermal behavior and reaction mechanism of pure Co(OH)F and Co(OH)F@Al composites were thoroughly investigated, and Co(OH)F@Al was compared with CoO@Al and Co 3 O 4 @Al with identical morphology. In the Co(OH)F@Al composite, a pre-ignition reaction was observed which was attributed to the etching of Al 2 O 3 shell by HF and the fluoridation of Al core by HF and CoF 2 . With the assistance of pre-ignition reaction, Co(OH)F@Al can complete main exothermal reaction before Al melting in a solid-state mechanism, and its peak temperature is around 200 ℃ lower than those of MICs employing CoO and Co 3 O 4 as oxidizers.
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Micromachines
·
2023
·Vol. 14
·期 4
·870
·
IF 3.4
Huan Wang,Mingxuan Dong,Baorui Shao,Yaodan Chi,Chao Wang,Sa Lv,Ran Duan,Boqi Wu,Xiaotian Yang
N-TiO2/Ni(OH)2nanofiber was successfully prepared by combining the electrospinning and solvothermal method. It has been found that under visible light irradiation, the as-obtained nanofiber exhibits excellent activity for the photodegradation of rhodamine B, and the average degradation rate reaches 3.1%/min−1. Further insight investigations reveal that such a high activity was mainly due to the heterostructure-induced increase in the charge transfer rate and separation efficiency.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Yicong Wang,Sisuo Zhang,Richard L. Smith,Xiaoning Liu,Xinhua Qi
Effective removal of both nitrogen and phosphorus from water is of great importance for maintaining the safety of the environment. In this work, ordered mesoporous carbon electrode materials containing La(OH) 3 and Fe 3 C components (La#OMC-Fe 3 C) were prepared by combining solvent evaporation induced self-assembly and impregnation methods. The ordered pores in La#OMC-Fe 3 C facilitated electron transfer at the electrode-solution interface during nitrate reduction and provided voids for phosphate removal . In the electrochemical system, Fe 3 C in the electrode supplied electrons for nitrate reduction and gave the electrode a high degree of stability, whereas La(OH) 3 selectively removed phosphate, thus avoiding byproduct precipitation from solution. The electrode material maintained efficient electrochemical nitrogen and phosphorus removal over a wide range of conditions including pH (3–11) and aqueous environments containing multiple ions (Cl − , SO 4 2− , K + , Na + , Ca 2+ , Mg 2+ ) or actual aqueous environments (seawater). After 10 cycles, the performance of La#OMC-Fe 3 C for nitrogen and phosphorus removal remained above 97%. This work realizes the simultaneous removal of nitrogen and phosphorus in the electrochemical system, and solves the problems of precipitation in water and non-circulation of electrodes, which can provide a new strategy for the treatment of eutrophic water in practical production.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Weiwei Mao,Haiping He,Zhizhen Ye,Jingyun Huang
A facile and in-situ electrochemical nanofabrication towards three-dimensional graphene@nickel foam (3DGF) to produce Ni(OH) 2 nanosheets was proposed and the integrated Ni(OH) 2 /3DGF electrode for glucose sensing was researched. The nanofabrication of chemical battery reaction is mild and facile. Nanopores formation plays a key role in promoting the growth of Ni(OH) 2 nanosheets, leading to enhanced electro-catalysis. In this constructed unique 3D hierarchical architecture, graphene layers not only provide excellent electrical conductivity but also benefit to the sensing stability, while the 3D interconnected structure prevents the agglomeration or exfoliation of Ni(OH) 2 nanosheets and the porous Ni(OH) 2 film benefits to the mass and charge transfer, and thus improving the sensing performance remarkably. As a successful demonstration, the fabricated Ni(OH) 2 /3DGF glucose sensor exhibits an appreciable sensitivity 2366 μA mM −1 cm −2 and a low detection limit of 0.32 μM. This study proposes an easy and convenient strategy to prepare Ni(OH) 2 and graphene integrated glucose sensor, promisingly applied in practice.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Bin He,Huanhuan Liu,Zheng Lin,Lei Yan,Jiqiang Ning,Yijun Zhong,Changcheng Zheng,Ziyang Zhang,Yong Hu
The practical application of photocatalytic water splitting is essentially limited by the slow kinetic nature of the water oxidation process. Therefore, it is highly desirable but challenging to explore a low-cost and high-efficiency water oxidation catalyst for the aim of commercialization and industrialization. We herein report the first-time synthesis of a novel and high-efficiency visible-light-driven photocatalyst composed of flower-like Co(CO 3 ) 0.5 (OH)·0.11H 2 O (CCO) nanowires and Bi 2 WO 6 (BWO) nanosheets, i.e. CCO/BWO nanocomposite, via a facile hydrothermal method. Without utilizing any additional cocatalyst, the composite of CCO/BWO in 30% weight ratio exhibits extraordinarily high photoactivity and photostability towards O 2 evolution, achieving an average O 2 generation rate of 953 µmol h −1 g −1 under visible-light irradiation (λ > 420 nm).
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2018
·Vol. 125
·期 1
·1-9
·
IF 1.604
He Junfeng,Hu Jiamin,Mo Xi,Hao Qing,Fan Zhili,He Guannan,Wang Yinzhen,Li Wei,He Qinyu
As photocatalysts exhibit selectivity toward various pollutants, it is necessary to develop different and novel photocatalysts. In this work, a novel photocatalyst-nitrogen-doped simonkolleite Zn 5 (OH) 8 Cl 2 ·H 2 O (DSM) is prepared through a new facile method: calcinating the mixture of zinc hydroxide, urea, and guanidine hydrochloride at 575 °C for 1 h in a furnace with an air atmosphere. The as-prepared sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra, UV–visble near-infrared diffuse reflection spectra (UV–Vis–NIR DRS), Brunauer–Emmett–Teller (BET) method, Ramen spectra and Zeta potential measurement, photocatalytic properties, as well as active species trapping experiments. XRD and XPS show the as-prepared powder is nitrogen-doped simonkolleite Zn 5 (OH) 8 Cl 2 H 2 O (DSM) with a small ZnCl 2 fraction. SEM investigation indicates that the as-prepared powder possesses a flower-like layered shape. The UV–Vis–NIR exhibits that after doping, the DSM possesses strong light absorption in the ranges of 300–500 and 1400–2500 nm, a direct electronic transition with a band gap energy of 2.469 eV. PL measurement reveals a strong photoluminescence and an up-conversion from lower to higher-energy visible light in as-prepared samples. Zeta potential investigations show that during photocatalysis, the charges on as-prepared photocatalyst are positive. The photocatalytic experiments show a good dark adsorption, a high photodegradation (99.4% at 60 min), a high pseudo-first-order constant ( k ) of 0.0261 min −1 . Meanwhile, the active species trapping experiments suggest that hole (h + ) is the dominant active species during photocatalysis. It is concluded that the doping favors in enhancing vis-light-photocatalysis. This work makes a significant contribution to the literature.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Zhenying Liu,Shuai Ma,Xiao Li,Hu Yang,Zhenliang Xu
New porous carbonaceous materials are anticipated in the energy storage and environmental application. In the present study, a new carbonaceous composite with hierarchically porous structure was prepared from Mg(OH) 2 pre-filled PAN based membrane for the first time. The obtained carbonaceous composite contains 54.1% C, 26.8% O, 6.2% N and 5.6% Mg. Afterwards, the composite was tested as a supercapacitor and dye adsorbent. Its special capacitance reached 278 F/g at the scan rate of 0.5 A/g, and 186 F/g at the scan rate of 50 A/g, which outperforms most of supercapacitors obtained from the same precursor. A good cycling stability (98% in 5000 cycles) and a high power density (about 7000 W/kg) are achieved. As a dye adsorbent, the composite shows a high MO adsorption capacity of 1170 mg/g, much higher that of the active carbons. These results indicate an effective method to prepare new carbonaceous materials or to treat those disfunctional membranes.
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ChemCatChem
·
2019
·Vol. 11
·期 10
·2520-2525
·
IF 4.495
Jiali Sheng,Jiahui Chen,Jiahui Kang,Yan Yu,Ning Yan,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Graphical Yolk-shell nanocages : Unique octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages composed of crystalline Cu 2 O core and amorphous Co(OH) 2 shell are fabricated by a facile Cu 2 O self-templated strategy at room temperature. The as-prepared yolk-shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation due to the sufficient active sites and large surface area, synergistic effect between Cu 2 O and Co(OH) 2 , which are benefited from the special yolk-shell nanocages. Unique octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages are synthesized by a facile Cu 2 O self-templated strategy as efficient glucose oxidation electrocatalysts. Amorphous Co(OH) 2 nanoflakes are formed as octahedral shells through coordinating etching conversion from part of Cu 2 O templates. The un-etched crystalline Cu 2 O octahedrons are then remained as cores and voids exist between the cores and shells. The special structure endow these yolk-shell heterostructure nanocages with abundant active sites, large surface area, and synergistic effect between Cu 2 O and Co(OH) 2 . The octahedral yolk-shell Cu 2 O@Co(OH) 2 nanocages demonstrate superior electrocatalytic activity for glucose oxidation in terms of high sensitivity of 1340 μA cm −2 mM −1 , low detection limit of 2 μM, wide linear sensing range, and long-term stability. This strategy might shed lights on the synthesis of various yolk-shell heterostructure nanocages with controllable structures and enhanced catalytic performances.
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POWDER TECHNOLOGY
·
2018
·
IF 3.23
Weiwei Chu,Zhenzhen Lu,Ruiqin Tan,Shihui Tang,Wei Xu,Weijie Song,Junhua Zhao
In this work, β-SrHPO 4 , Sr 3 (PO 4 ) 2 , and Sr 5 (PO 4 ) 3 (OH) (SrHAp) powders were successfully prepared by a controllable hydrothermal method and were utilized in removal of lead ion (Pb 2+ ). The effects of pH value, contact time and initial ion concentration on the immobilization of Pb 2+ were investigated systematically. Results showed that β-SrHPO 4 exhibited a capacity of 1438 ± 45 mg/g for Pb 2+ , while Sr 3 (PO 4 ) 2 and SrHAp showed values of 1223 ± 45 mg/g and 543 ± 45 mg/g respectively under the optimum conditions. The XRD , SEM and EDX results revealed that the mechanism of Pb 2+ immobilization by β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp was mainly due to a process of dissolution and precipitation in the acidic solution. Comparing the immobilization behavior and capacities of β-SrHPO 4 , Sr 3 (PO 4 ) 2 and SrHAp for Pb 2+ removal, it is shown that β-SrHPO 4 is an effective and eco-friendly material for the removal of Pb 2+ from acidic aqueous solutions among strontium phosphates materials.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Danfeng Jiang,Zhenyu Chu,Jingmeng Peng,Jingyi Luo,Yangyang Mao,Pengqi Yang,Wanqin Jin
Currently, most metal oxides- or hydroxides-based and non-enzymatic sensors require a high alkali concentration in the working environment. Here, we designed a novel non-enzymatic sensor based on a 3D nanostructured Co(OH) 2 /rGO film to address this issue. The architecture of the hybrid film was in-situ constructed by the dense assembly of 200 nm flower-like Co(OH) 2 crystals bridged by rGO nanosheets . This structure possessed an extremely large specific surface area and an excellent conductivity which were beneficial for adsorbing OH to produce oxidative CoOOH or CoO 2 , even in a low alkaline condition. This material was able to mimic the functionality of glucose oxidase to oxidize glucose to gluconolactone and exhibited a good sensitivity at a wide alkaline range from 5 × 10 −3 to 1 mol L −1 NaOH solution. Moreover, this sensor showed a wide linear range, excellent selectivity, reproducibility and stability for real blood analysis.
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