CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Qingli Qu,Xiaoli Zhang,Hossein Ravanbakhsh,Guosheng Tang,Jian Zhang,Yankang Deng,Kevin Braeckmans,Stefaan C. De Smedt,Ranhua Xiong,Chaobo Huang
Core-shell multicompartmental microparticles have gained increasing attention as their architecture resembles the multicompartmental composition of eukaryotic cells. However, challenges remain in the fabrication of biocompatible multicompartmental microparticles at a sufficiently high scale. Herein, all-aqueous ‘mangosteen-like’ core–shell multicompartmental microparticles were created by an oil-free gas-shearing fabrication approach. Both the shell thickness and core size of thus obtained mangosteen-like microparticles can be easily finetuned. Mangosteen-like particles have well segregated (up to eight) compartments which are attractive to precisely control enzymatic cascade reactions. To illustrate the application potential, insulin releasing mangosteen-like microparticles (‘artificial pancreatic beta cells’) were developed.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Qi Hu,Zhenming Wang,Junyu Chang,Peng Wan,Jiahui Huang,Liang Feng
The accurate and rapid sensing of NH 3 at room temperature is a challenging conundrum for daily life and environment protection. In this work, we have explored an intriguing material, hollow NiO sphere composited with polyaniline (labelled as h-NiO-PANI) for NH 3 gas sensing, fabricated by growing PANI on the hollow NiO sphere derived from solvothermal synthesis and calcination. Ni-Cu glycerate is obtained via solvothermal synthesis, which is a universal way to produce uniform glycerate microspheres. During calcination, the hollow sphere is ingeniously designed by taking advantage of the outward adhesion from CuO to the inner core. Polymerization of aniline on the hollow spheres is beneficial for large specific surface area and gas adsorption. Impressively, the sensor based on h-NiO-PANI exhibits favorable response to NH 3 (ΔR/R 0 =43 % for 10 ppm, 149 s in response and 257 s in recovery), which is greatly better than the counterparts (NiO-PANI and PANI). Moreover, the sensor has also shown superb anti-interference against common volatile organic compounds (VOCs), water and humidity, along with the superior repeatability in 5 cycles and long-term stability in a week, manifesting the sensor a promising candidate in daily application. The enhanced gas sensing performance is attributed to the hollow structure and construction of p-p heterojunctions between NiO and PANI.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Cheng Qian,Ran Wang,Min Li,Xuetong Li,Bingcheng Ge,Zhenhua Bai,Tifeng Jiao
In recent years, the researches on the modification and functionalization of black phosphorus (BP) materials have attracted more and more attention. In this study, few-layers BP nanosheets (BPNS) were prepared by a simple liquid exfoliation method. However, BPNS has the disadvantages of easy oxidation and poor stability, which will also affect the performance of BP. Therefore, 4-azidobenzoic acid was used to modify the BPNS to improve the stability of BP. In addition, 4-azidobenzoic acid modified BPNS (f-BPNS) and dye molecules can form a composite Langmuir-Blodgett (LB) film through electrostatic interaction or π-π stacking forces. UV–vis, Atomic force microscopy (AFM) and other characterizations were used to prove the successful preparation of the f-BPNS-dye composite LB film. It should be noted that the obtained uniform and dense composite films showed good sensitivity to acid and alkali gas. Moreover, the f-BPNS-dye composite films can still maintain high performance after 10 cycles of acid-alkali tests, indicating that the prepared films have high stability. This work provides a new direction for the preparation of new two-dimensional composite materials and their application in gas sensors.
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JOURNAL OF FLUORINE CHEMISTRY
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2020
·
IF 2.332
Yongyang Chen,Dan Guo,Xiaochun Dong,Yahui Li,Yixuan Huang,Hao Chen,Shanping Li
Perfluorooctanoic acid (PFOA), as a refractory organic pollutant, seriously harms the environment and damages human health. Here, the electrocatalytic method was selected to degrade PFOA. In this work, perovskite catalysts doped with different elements, and corresponding gas diffusion electrodes (GDE) were prepared by the gel-sol method and citric acid complexation method. The crystal structure, microscopic morphology, and electrochemical properties of the LaNi x Y 1-x O 3 (Y = Fe, Cu, Co, Sr) perovskite catalyst electrode were analyzed by XRD, TEM, and CV. Moreover, the electrocatalytic performances of the as-prepared electrodes were assessed by the degradation of PFOA, and the Sr-doped GDE exhibited the highest degradation rate of PFOA. The optimum degradation conditions, such as the current density, pH, and initial concentration were also investigated. It was observed that when the current density was 20 mA/cm 2 , pH was 5, and initial concentration was 0.25 mmol/L, the Sr-doped GDE had the best degradation and defluorination efficiency of PFOA reached 90.0 % and 75.1 %, respectively. High performance liquid chromatography-mass spectrometry (HPLC-MS) was used to analyze the intermediate products of PFOA degradation and obtain the degradation pathway. With the combined action of OH and O 2 , PFOA was degraded by stepwise removal of CF 2 groups, which were ultimately degraded into F − and CO 2 .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Ao Liu,Siyuan Lv,Li Jiang,Fangmeng Liu,Lianjing Zhao,Jing Wang,Xiaolong Hu,Zijie Yang,Junming He,Chenguang Wang,Xu Yan,Peng Sun,Kengo Shimanoe,Geyu Lu
In this work, we developed a NH 3 gas sensor based on polyaniline (PANI) composited with MoS 2 nanosheet-coated SnO 2 nanotubes (PMS) via electrostatic spinning, hydrothermal route and in-situ polymerization technique. The morphologies, nanostructures and compositions of the materials were obtained from X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Field emission scanning electron microscopy (FESEM), Transmission electron microscope (TEM) and Brunauer-Emmett-Teller method (BET). Thanks to nanostructure and the synergistic properties of PANI and MoS 2 /SnO 2 , the designed PMS gas sensor exhibited response signal of 10.9 towards 100 ppm NH 3 at room temperature and a low detection limit of 200 ppb with good response-recovery time, good repeatability, acceptable flexibility and excellent selectivity. This study offers a versatile platform to modify PANI for highly selective detection of NH 3 gas sensor at room temperature.
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COMPUTERS AND ELECTRONICS IN AGRICULTURE
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2020
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IF 3.858
Chengyu Zheng,Zhenhe Wang,Jing Zhang,Jun Wang,Jianli Zhong,Yongwei Wang
Platycladus orientalis plants in China are experiencing a serious problem with wood-boring beetles, but conventional physical detection methods cannot perform well due to hidden larvae and less obvious symptoms in the early infestation. In this study, the volatile organic compounds (VOCs) of P. orientalis were investigated using gas chromatography-ion mobility spectrometry (GC-IMS) to identify its internal infestation. An image-based evaluation method of the degree of internal wood damage was proposed, the principal component analysis (PCA) based on specific markers was applied for natural clustering of samples, and unsupervised learning approaches based on specific markers and automatically located peaks were used to create predictive models for sample classification. The results showed that the herbivore-induced plant volatiles (HIPVs) of P. orientalis samples had two main characteristics compared with undamaged plants. One was the emergence of several compounds such as C 3 -C 6 ketones, aldehydes, and alcohols, while the other was the obvious content variation of several monoterpenes and their derivatives. The classification models based on specific markers and automatically located peaks could correctly classify at least 89.5% and 87.9% of the samples, respectively. In a word, these results proved that GC-IMS based approaches combined with different feature extraction methods have the potential to identify the internal infestation of wood-boring beetles in P. orientalis .
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Can Cheng,Jianjun Li,Jinyan Cao,Jiaxiu Guo,Wanglai Cen
The absorption properties of N-(2-hydroxyethyl) morpholine (HEM), morpholine (MP) and N-(2-aminoethyl) morpholine (AEM) for SO 2 were studied using sulfolane (SUL) as solvent in this work. Among these solvent combinations, HEM/SUL shows the best cyclic absorption performance, and the capacity of HEM-SUL-40 (40 wt% of HEM and 60 wt% of SUL) to absorb 8580 mg/m 3 SO 2 (the remainder is N 2 ) is 192.18 mg/g at 293.15 K. The absorption capacity of the second cycle is 97.5% of the first absorption cycle, which is higher than 70% of the Cansolv amine solution in a commercial application with similar experimental conditions. However, MP/SUL is difficult to desorb at high temperature, and the absorption capacity of AEM/SUL is much lower than HEM/SUL and MP/SUL. According to the FTIR , 1 H NMR and 13 C NMR, all three cyclic amines have charge transfer effects with SO 2 . The structure of HEM/SUL can be recovered after heating, but MP cannot be recovered. Δ r G m ° in the reaction against HEM with SO 2 increases significantly with increasing temperature. The Δ r G m ° of HEM-SO 2 and MP-SO 2 at 353.15 K is −12.56 kJ/mol and −16.29 kJ/mol, respectively, which further explains the easy desorption of HEM-SO 2 and the difficult desorption of MP-SO 2 at high temperature.
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Nanoscale
·
2020
·Vol. 12
·期 32
·16987-16994
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IF 6.895
Qian Sun,Jian Wang,Xiang Wang,Jie Dai,Xiaoshan Wang,Huacheng Fan,Zhiwei Wang,Hai Li,Xiao Huang,Wei Huang
MXenes, a rapidly developing family of two-dimensional materials possessing tunable electronic properties and abundant surface functional groups, are promising gas-sensing materials. Ti2CTx, with a thinner unit cell thickness compared to its compositional analogue Ti3C2Tx and thus more profound surface-dependent properties, has been less explored over the past years. Herein, by etching the precursor Ti2AlC with a concentrated HF or LiF/HCl mixture, semiconducting Ti2CTx (HF) nanosheets and metallic Ti2CTx (LiF/HCl) nanosheets were obtained, respectively, arising from their treatment-dependent surface functionalization. In addition, the resulting metallic nanosheets were partially oxidized into TiO2/Ti2CTx (LiF/HCl) hybrid, which exhibited superior sensitivity toward NH3 gas as compared with Ti2CTx (HF) and Ti2CTx (LiF/HCl). Detailed analysis suggests that a high concentration of surface oxygen containing species, such as –Ox, –(OH)x and Ti–O–Ti, is generally beneficial for NH3 sensing, and a relatively higher –Ox concentration allows rapid gas desorption and sensor recovery.
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APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Xuejiao Tang,Jingjing Xue,Cheng Xing
Nickel ferrite (NiFe 2 O 4 ) nanocatalysts with trace metal nickel (Ni 0 ) as the reaction trigger were dispersedly supported by halloysite nanotubes (HNTs) to decompose toxic phosphine (PH 3 ) into yellow phosphorus and hydrogen. The mixed spinel catalyst greatly reduced the temperature to 400 °C for 99% conversion and underwent no obvious deactivation after 2 h compared with magnetite. The as-synthesized and spent catalysts were characterized by Transmission electron microscope, X-ray powder diffraction and X-ray photoelectron spectroscopy. In combination with density functional theory calculations, the PH 3 decomposition mechanism on Ni 0 @NiFe 2 O 4 /HNTs was proposed. The original plated Ni 0 triggers the reaction to form active H radicals ([ ▾ H]) contributing to the reduction of octahedral Ni(II) in NiFe 2 O 4 , and the newly generated Ni 0 determines the catalytic activity and stability. In addition, the formation of Ni 2 P is crucial to developing the stable elemental phosphorus (P) layer as the mainly active intermediate for PH 3 successive decomposition into P 4 , since P layer reduces the activation barrier of PH 3 decomposition. Particularly, the mixed crystal spinel with specific coordination (with octahedral coordinated Fe(II) and tetrahedral coordinated defects) facilitates the electron transfer among the active species to recycle the catalytic reaction. This work provides a promising approach for PH 3 air-pollution control and P recovery from the industrial off-gas.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Kelin Hu,Feipeng Wang,Zijia Shen,Hongcheng Liu,Wen Zeng,Yu Wang
In this study, ZnO–SnO 2 heterojunction nanofibers were fabricated using electrospinning and treated by Ar plasma. The post treatment demonstrated the ability to regulate adsorbed oxygen of nanofibers and thus affecting the gas sensing performance. The results revealed that the gas sensing performances increased with the increase of plasma treatment time at first, then showed a downward trend. The setting for the best H 2 gas performance was 20 min of plasma treatment, under which the response of the sample was 80% higher and the response time was two thirds shorter than those of the untreated sample. The explanation can be that appropriate plasma treatment can increase the oxygen vacancy on the surface of heterojunction nanofibers as well as the resistance modulation range in the air; however, excessive plasma treatment can result in the reduction of the resistance modulation range in the air by reducing the metal oxide to metal.
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OPTICS AND LASER TECHNOLOGY
·
2020
·
IF 3.233
Gulgina Mamtmin,Nuerguli Kari,Renagul Abdurahman,Patima Nizamidin,Abliz Yimit
Optical waveguide (OWG) sensors are widely used in gas detection, and sensitive materials are the key factors affecting sensor performance. Herein, we report on a 5,10,15,20-tetrakis-(4-methoxyphenyl) porphyrin (TMP) deposited optical wave guide (OWG) sensor. The porphyrin solutions with different acidity were deposited on a K + -ion exchanged glass OWG surface by spin coating, to fabricate porphyrin film-coated OWG gas sensing devices. The effects of pH values of the porphyrin solution used to prepare the sensitive film on the sensing properties of these devices were investigated. The gas sensitive performances of these devices in response to analytes were compared. Among them, the sensing devices fabricated using original and acidic solutions of porphyrin exhibited significant responses to sulfide gases and ethanediamine, respectively. The sensing device prepared using an acidic solution has a good response to ethanediamine gas (response and recovery times of the sensor for 1 ppm of EDA (ΔI = 48) are 13 and 38 s, respectively). The RSD of the output light intensity is ±2.84, the signal to noise ratio (S/N) is 5.6. The device prepared using the original solution has an excellent response to sulfide gases (H 2 S, SO 2 ), and can detect low concentration levels (ppm) of sulfide gases. These sensing devices thus have the potential to be used in food quality testing and environmental monitoring.
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CHEMOSPHERE
·
2020
·
IF 5.778
Wei Wang,Yanchun Li,Yawei Li,Minghua Zhou,Omotayo A. Arotiba
A novel superhydrophobic gas diffusion electrode based on carbon black (CB)- polytetrafluoroethylene (PTFE) modified graphite felt cathode was prepared to increase oxygen mass transfer efficiency and produce hydrogen peroxide at the gas-liquid-solid three-phase interface without aeration. The gas diffusion electrode system was further tested for the degradation of sulfamethazine (SMT) by electro-Fenton (EF) and photoelectro-Fenton (PEF). In the EF process, SMT was removed effectively, but the mineralization degree was not high due to the generation of organic acids which were difficult to be further degraded. While in the PEF process, organic contaminant can be destroyed by the combined action of Fe 2+ /H 2 O 2 , UV/H 2 O 2 and UV radiation, and more efficient mineralization (>83.5%) at low current (50 mA) was attained, which might be attributed to the high H 2 O 2 utilization (70–90%), rapid regeneration of Fe 2+ and photolysis of intermediates. In addition, it was verified that the PEF system had a good adaptability to pH and pollutant concentration . Compared with aeration system, the use of this active gas diffusion cathode in electrochemical advanced oxidation processes significantly reduced energy consumption.
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