ACS Applied Materials & Interfaces
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2021
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IF 9.229
Kai Wang,Huaqiang He,Baibing Wei,Tian C. Zhang,Haiqing Chang,Yingqi Li,Xiaobao Tian,Yubo Fan,Ying Liang,Shaojun Yuan
Surfaces with unusual under-liquid dual superlyophobicity are attractive on account of their widespread applications, but their development remains difficult due to thermodynamic contradiction. Additionally, these surfaces may suffer from limited antifouling ability, which has restricted their practical applications. Herein, we report a successful in situ growth of a hybrid zeolitic imidazolate framework-8 and zinc oxide nanorod on a porous poly(vinylidene fluoride) membrane (ZIF-8@ZnO-PPVDF) and its application as a self-cleaning switchable barrier material in rapid filtration for emulsified oily wastewater. The novel ZIF-8@ZnO-PPVDF exhibits superior mechanical strength, reversible under-liquid dual superlyophobicity, photocatalytic self-cleaning property, and an effective alternate separation capacity toward both oil-in-water (O/W) and water-in-oil (W/O) emulsions with ultrahigh fluxes and efficiencies (>99%). By simply using a “bait-hook-eliminate” method to separate the O/W emulsions containing soluble organic pollutants, we demonstrate that the ZIF-8@ZnO-PPVDF can achieve stable separation fluxes over 600 L m–2 h–1 with high efficiencies and be completely/nondestructively regenerated by visible-light irradiation after each cycle. This study would demonstrate a new approach to prepare an under-liquid dual superlyophobic revivable membrane for various applications.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Yuanxia Lv,Xiaohuan Qin,Kun Hu,Fanggui Ye,Shulin Zhao
This study proposes a surface-assisted laser desorption ionization time-of-flight mass spectrometry (SALDI-TOF MS) method using an ultrastable microporous hydrogen-bonded organic frameworks (MP-HOFs) for selective and sensitive analysis of two common organic pesticides: paraquat (PQ) and chlormequat (CQ) in real samples. MP-HOFs are formed by H-bonding self-assembly of co-planar π-conjugated large aromatic tectons with carboxylate groups. They can not only efficiently absorb and transfer laser energy, but also specifically capture and isolate target analytes from complicated systems. The proposed SALDI-TOF MS method exhibited high salt tolerance and low background. The selective enrichment performance of MP-HOFs was demonstrated by analyzing PQ and CQ in real samples. Simultaneous analysis results of PQ and CQ showed satisfactory reproducibility with relative standard deviations (RSDs) of 3.2–9.2% and 5.7–12.3% for spot-to-spot and sample-to-sample, good linearity (R 2 > 0.99), and high sensitivity with a limit of detection of 0.001 and 0.05 ng mL −1 , respectively. The detection limits of PQ and CQ test analytes were three and two orders of magnitude lower than those of non-enriched PQ and CQ, respectively. Furthermore, the possible ionization mechanism was discussed, and the presented approach was successfully applied for PQ and CQ detection in tap water, river water, and soil, confirming its potential in practical applications.
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MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Dedong Zeng,Jiangli Wang,Yu Xie,Yun Ling,Jinsheng Zhao,Hao Ye,Tongcai Chen
Designing and fabricating the double-capability photocatalysts with the capability of producing hydrogen from the splitting of water and degrading environmental organic pollutants under visible light irradiation are significant in environmental treatment and new energy preparation. As a proof of concept, TiO 2 @ZnFe 2 O 4 heterojunctions with high performance and stability were prepared by a one-step hydrothermal method , in which TiO 2 nanosheets successfully grew on the main body of ZnFe 2 O 4 nanorods . The microstructures and morphologies of the as-produced composites as well as their photocatalytic hydrogen generation rate and photocatalytic degradation performances towards humic acid, florfeniol, tetracyclines, and bisphenol A were investigated. The results indicate that TiO 2 @ZnFe 2 O 4 heterojunctions possessed the higher photocatalytic activities towards hydrogen production and contaminants degradation ability than that of only TiO 2 and ZnFe 2 O 4 . Especially, TiO 2 @ZnFe 2 O 4 heterojunctions with the molar ratio of 1:4 have the best activities and manifest good stability. Significant enhancement of visible light absorption and photogenerated charge separation of TiO 2 @ZnFe 2 O 4 were achieved. This work paves a way to construct a low-cost, environment-friendly, recyclable, and non-poisonous photocatalysts for hydrogen generation and the degradation of pollutants.
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CHEMOSPHERE
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2021
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IF 7.086
Xintong Li,Hongxia Zhao,Baocheng Qu,Yu Tian
Environmentally persistent free radicals (EPFRs) generated under irradiation have been widely detected in soil particles, atmospheric particles and microplastic particles, but the formation of EPFRs in water is not well understood. This study investigated the formation of EPFRs on particulate organic matter (POM) in water contaminated by anthracene (Ant) under irradiation. The photoformation and decay progress of EPFRs was represented with the help of electron paramagnetic resonance (EPR) technique on both actual POM and Fe(III)-montmorillonite simulated samples. EPR signals at the range of 10 16 to 10 17 spin/g were detected and the half-life time of EPFRs stored in water was at around 16.62 h and 60.80 h, much shorter than those in the air. The g factors were all larger than 2.0040, which indicated the generation of oxygen centered EPFRs. The primary intermediates were identified by gas chromatography-mass spectrometer (GC-MS) and a possible EPFR formation pathway during Ant degradation was proposed. The interaction between Ant and POM, and the hydroxylation and carbonylation of the intermediates made contributions to the generation of EPFRs. Meanwhile, the indirect photodegradation of bisphenol A (BPA) has been demonstrated by analyzing the reactive oxygen species (ROS) and photogenerated electrons in the solution with POM containing EPFRs. It is found that hydroxyl radicals (•OH) and singlet oxygen ( 1 O 2 ) were induced and might promote the photodegration. Overall, our present study provided useful information to understand the photoformation of EPFRs on POM and their fate in aqueous environments.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2021
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IF 9.028
Liying Wu,Zhiqiang Sun,Yufei Zhen,Shishu Zhu,Chen Yang,Jing Lu,Yu Tian,Dan Zhong,Jun Ma
Ubiquitous oxygen vacancies (Vo) existing in metallic compounds can activate peroxymonosulfate (PMS) for water treatment. However, under environmental conditions, especially oxygenated surroundings, the interactions between Vo and PMS as well as the organics degradation mechanism are still ambiguous. In this study, we provide a novel insight into the PMS activation mechanism over Vo-containing Fe–Co layered double hydroxide (LDH). Experimental results show that Vo/PMS is capable of selective degradation of organics via a single-electron-transfer nonradical pathway. Moreover, O2 is firstly demonstrated as the most critical trigger in this system. Mechanistic studies reveal that, with abundant electrons confined in the vacant electron orbitals of Vo, O2 is thermodynamically enabled to capture electrons from Vo to form O2•– under the imprinting effect and start the activation process. Simultaneously, Vo becomes electron-deficient and withdraws the electrons from organics to sustain the electrostatic balance and achieve organics degradation (32% for Bisphenol A without PMS). Different from conventional PMS activation, under the collaboration of kinetics and thermodynamics, PMS is endowed with the ability to donate electrons to Vo as a reductant other than an oxidant to form 1O2. In this case, 1O2 and O2•– act as the indispensable intermediate species to accelerate the circulation of O2 (as high as 14.3 mg/L) in the micro area around Vo, and promote this nano-confinement electron-recycling process with 67% improvement of Bisphenol A degradation. This study provides a brand-new perspective for the nonradical mechanism of PMS activation over Vo-containing metallic compounds in natural environments.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Li Chen,Tahir Maqbool,Congyu Hou,Wanyi Fu,Xihui Zhang
In recent years, activation of persulfate via Mn-based composites has gained interest due to extraordinary kinetics and performance for the degradation of organic contaminants. However, the potential of pristine manganese oxides (Mn 3 O 4 ) in removing organic compounds and its mechanism has not been comprehensively explored yet. This study systemically investigated the Mn 3 O 4 based peroxymonsulfate (PMS) activation to effectively mitigate bisphenol A (BPA) in different real water matrixes. Substantial mineralization (75.9%) with efficient removal of BPA (96.7%) has been achieved at optimum conditions in 60 min. A long-term performance, eight cycles of reusability, has shown merely an 11% reduction in BPA removal, highlighted the higher stability of Mn 3 O 4 . The oxidizing contributions of reactive oxygen species (ROS) were in the order of 1 O 2 > O 2 •- > SO 4 •- > • OH. The different water matrixes have influenced BPA degradation by<10%. Linear changes in BPA aromatic contents were recorded using log-transformed ultraviolet (UV) spectra and fluorescence excitation-emission matrix (EEM). Total 17 transformation products (TPs) were detected in Mn 3 O 4 /PMS/BPA system, with 13 decreasing concentrations and 4 TPs in increasing concentration with the β-scission reaction as the main pathway for the degradation of BPA. The toxicity of BPA after degradation was also significantly suppressed measured by the activated sludge inhibition method.
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FOOD CHEMISTRY
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2021
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IF 7.514
Qingyi Wei,Peiyao Zhang,Hongbin Pu,Da-Wen Sun
Trace amounts of 17 β -estradiol (E2) in food and the environment poses a threat to human health, which has created the demand for sensitive analytical methods to detect E2. In this study, a novel fluorescent aptasensor was developed for sensitive detection of E2 based on double-chain hybridization between carbon quantum dots-labelled with E2 aptamer (CQDs-aptamer) and Fe 3 O 4 nanoparticles modified by complementary DNA (Fe 3 O 4 -cDNA). Under the optimal conditions, the aptasensor displayed a good linear range of 10 -11 –10 -6 M for E2 with the coefficient of determination (R 2 ) of 0.996, and a low detection limit of 3.48 × 10 -12 M was obtained. Besides, the aptasensor showed high selectivity and good reproducibility for E2 detection, which was successfully applied to the sensitive detection of E2 in milk as compared with tap water and lake water with satisfactory recoveries from 85.21% to 114.80%, suggesting the great significance of this aptasensor for detecting food contaminants in the food industry.
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ENVIRONMENTAL RESEARCH
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2021
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IF 6.498
Jianfei Chen,Tianli Tong,Yuyin Yang,Yanchu Ke,Xiuli Chen,Shuguang Xie
Bisphenol A (BPA), as both an endocrine disrupting compound and an important industrial material, is broadly distributed in coastal regions and may cause adverse effects on mangrove ecosystems. Although many BPA degraders have been isolated from various environments, the in-situ active BPA-degrading microorganisms in mangrove ecosystem are still unknown. In this study, DNA-based stable isotope probing in combination with high-throughput sequencing was adopted to pinpoint the microbes actually involved in BPA metabolism in mangrove sediments. Five bacterial genera were speculated to be associated with BPA degradation based on linear discriminant analysis (LDA) effect size (LEfSe) analysis, including Truepera , Methylobacterium , Novosphingobium , Rhodococcus and Rhodobacter . The in-situ BPA degraders were different between mudflat and forest sediments. The Shannon index of microbes in heavy fractions was significantly lower than that in light fractions. Besides, phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt) demonstrated that the functional genes relevant to cytochrome P450, benzoate degradation, bisphenol degradation and citrate cycle were up-regulated significantly in in-situ BPA-degrading microbes. These findings greatly expanded the knowledge of indigenous BPA metabolic microorganisms in mangrove ecosystems.
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Materials Today Energy
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2021
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IF 7.311
Xin Li,Quan Feng,Dingsheng Wu,Alfred Mensah,Wei Li,Yibing Cai,Dawei Li,Qufu Wei
The rise of energy harvesting textiles opens up an emerging path to prospective energy solutions for the next generation of wearable electronics. Flexible electrodes as the core link in enzymatic biofuel cell (EBFC) should be stretchable while using enzyme molecules to transfer the energy from chemical of green fuels into electricity, which is beneficial to meet the key requirements of practical applications and shows considerable potential in wearable electronics. As a result, we develop a single EBFC based on intramolecular electron transfer using a stretchable electrode made of polyurethane/zeolitic imidazolate framework-8@laccase/carbon nanotubes (PU/ZIF-8@LAC/CNTs), which encapsulates LAC into ZIF-8 crystals during ZIF-8 in-situ growth on PU nanofibers . The maximal power density output of single-EBFC reached 1.33 W m −3 . More importantly, after multiple deformations of 75 stretching cycles, continuously stretching and holding and 180° twisting cycles, the single-EBFC retains an E OCV of more than 50%, which exhibits stable energy output, thus the stretchability of PU/ZIF-8@LAC/CNTs are proved. This stretchable electrode can establish a stable platform of power devices and will be potentially integrated into wearable electronics.
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Analytical Methods
·
2021
·Vol. 13
·期 47
·5777-5786
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IF 2.896
Jinyang Chen,Jiamei Wang,Ruihong Ye,Dihui Huang,Sheng Chen
The low conductivity of metal–organic frameworks seriously impedes their electrocatalytic performance. In this study, we prepared a fabricated sandwich structure composed of a Co-based zeolitic imidazolate framework (ZIF-67) and reduced graphene oxide (rGO) through a facile and simple one-pot hydrothermal reaction. This framework of nanocomposites, which are modified with a glassy carbon electrode, constructed a bisphenol A (BPA) electrochemical sensor for the first time. Operational parameters such as pH, electrolytes, the amount of modifiers, deposition potentials and deposition time were optimised for the sensitive detection of BPA. The performance of electrodes was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction and transmission electron microscopy. With differential pulse voltammetry, the detection concentration of BPA ranged from 0.05 μmol L−1 to 100 μmol L−1. The results revealed that the hierarchical nanocomposites demonstrated better electrocatalytic performance with large electrochemically active surface areas, high sensitivity and a low limit of detection (5.2 nmol L−1), compared with a physical mixture of ZIF-67 and rGO at the same ratio. These impressive features originate from the synergistic effects of ZIF-67 and rGO. This study presents a new strategy using metal–organic framework composite materials for the sensitive detection of BPA.
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FOOD CHEMISTRY
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2021
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IF 7.514
Yi Zhang,Jie Zhou,Xiao-Xiao Zhang,Wen-Long Wang,Cheng Yang,Xueli Shi,Yong-Wei Feng,Renagul Abdurahman
Consistent exposure to 17β-estradiol through drinking water and food can cause health problems. Although many simple and sensitive fluorescence sensors of 17β-estradiol have been reported, most of them are based on fluorescence quenching test mode working in visible light range, which are inferior in anti-interference ability and quantitative range. Here, we developed a near-infrared (NIR) phosphorescence aptasensor for the detection of 17β-estradiol that has no background fluorescence. The aptasensor was based on Foster resonance energy transfer (FRET) between aptamer conjugated NIR persistent luminescence nanoparticles (PLNPs-Apt) and MoS 2 nanosheets. The 17β-estradiol was quantified by the recovery of PLNPs’ phosphorescence. This assay can detect 17β-estradiol in 0.5 mL samples with the LOD of 0.29 ng mL −1 and in concentrations of more than three orders of magnitude (from 0.5 ng mL −1 to 1.2 μg mL −1 ). This aptasensor exhibited selectivity for 17β-estradiol and was applicable in complex milk samples.
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Defence Technology
·
2021
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IF 3.172
Wissam Bessa,Djalal Trache,Mehdi Derradji,Ahmed Fouzi Tarchoun
The design of astonishing combinations of benzoxazine resins with various fillers is nowadays of great interest for high quality products, especially in ballistic armors. The objective of this study is to investigate a new hybrid material prepared as multi-layered composite plate by hand lay-up technique. Different composites were manufactured from Kevlar fabrics reinforced polybenzoxazine, which was filled with silane treated microcrystalline cellulose (MCC Si) at various amounts in the interlayers. The developed materials were tested for their flexural, dynamic mechanical and ballistic performance. The aim was to highlight the effect of adding different amounts of MCC Si on the behavior of the different plates. Compared to the baseline, the dynamic mechanical and bending tests revealed an obvious decrease of the glass transition of 21 °C and a notable increase in storage modulus and flexural strength of about 180 %and17%, respectively, upon adding 1% MMC Si as filler. Similarly, the ballistic test exhibited an enhancement in kinetic energy absorption for which the composite supplemented with 1% MCC Si had the maximal energy absorption of 166.60 J. These results indicated that the developed panels, with interesting mechanical and ballistic features, are suitable to be employed as raw materials to produce body armor.
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