ACS ES&T Engineering
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2023
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IF 7.1
Zhipeng Li,Xu Zhang,Yuan Meng,Hong Yao,Zhanjun Cheng,Guanyi Chen,Peizhe Sun
The recent significant increase in the amount of municipal solid waste (MSW) is a remarkable environmental issue. Pyrolysis is a promising thermal treatment process, as it can reduce MSW and produce some valuable products as well. This study evaluated the potential of the carbon residue (CR) as an efficient H2O2 activator. The CR was produced from the copyrolysis of a mixture of abandoned cartons and plastic wraps, which are becoming increasingly dominant in MSW. The results show an interesting interaction between cartons and PVC, that the introduction of PVC into the carton greatly enhanced the activation rates of H2O2 by CR below the ratio of 0.2:1 (PVC/carton, w/w), whereas higher PVC content lowered its activation ability. EPR signals under different conditions revealed that CR directly activated H2O2 to mainly produce •O2–, which was responsible for pollutant degradation. A mechanistic study suggested that the rates of H2O2 activation were mainly governed by two factors: the amount of oxidative sites on CR and the conductivity of CR, which both were also quantitatively correlated with the activation rates of H2O2. Surface defects and surface-bound radicals were attributed to the two factors, respectively. The introduction of a limited amount of PVC to the carton greatly increased both factors mainly contributed from the generation of HCl during pyrolysis of PVC. In summary, this study may provide some new insights on the catalytic features of CRs, which are generated from the pyrolysis of a mixture of abandoned plastic wraps and cartons.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Lu Wang,Fengling Liu,Xinrang Zhai,Wei Dong,Wei Wei,Zhenhua Hu
It is a challenging clinical task to determine how to repair large-area skin defects better. Traditional wound dressings (e.g., cotton and gauze) can only be used as a dressing; consequently, there is an increasing demand for wound dressings with additional properties (i.e., antibacterial and pro-repair) in clinical practice. In this study, a composite hydrogel with o-nitrobenzene-modified gelatin-coated decellularized small intestinal submucosa ( [email protected] ) was designed for the repair of skin injuries. SIS is a natural extracellular matrix with a 3D microporous structure and also contains high levels of growth factors and collagen. GelNB provides this material photo-triggering tissue adhesive property. The structure, tissue adhesion, cytotoxicity, and bioactivity to cells were investigated. Based on in vivo study and histological analysis, we found the combination of GelNB and SIS improved the healing process by promoting vascular renewal, dermal remodeling, and epidermal regeneration. Based on our findings, [email protected] is a promising candidate for tissue repair applications.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sibang Liu,Gaoliang Wang,Liuyang Xu,Huanxia Jia,Xianke Sun,Honglei Yuan
NIR phosphor-converted light emitting diodes possess extensive application in a variety of occasions. And the exploration of NIR phosphors having outstanding quantum yield and thermostability is still a challenge. In this work, the layered structure and broadband GaTa 0.5 Nb 0.5 O 4 :Cr 3+ phosphors owning excellent performance were synthesized. The GaTa 0.5 Nb 0.5 O 4 :0.025Cr 3+ phosphor provides a quantum yield of 92.2%, as well as an activation energy of 0.329. The NIR pc-LED formed via the combination of GaTa 0.5 Nb 0.5 O 4 :0.025Cr 3+ phosphor and blue LED chip owns an output power of 4.56 mW and a photoelectric conversion efficiency of 9.37% when driven at 20 mA, and the output power increases to be 44.6 mW and the photoelectric conversion efficiency changes to be 7.19% when driven at 250 mA. The results of this work demonstrated that the Cr 3+ activated GaTa 0.5 Nb 0.5 O 4 phosphors may be a prospective candidate for NIR phosphor-converted light emitting diodes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Wei Wu,Yingying Zhao,Junjie Qi,Chunli Li,Jing Fang,Boyang Xu,Gaojin Lyu,Gang Li,Hao Li
The synthesis and application of conventional polymeric flocculants suffer from low flocculation efficiency and toxic residues; therefore, there is an urgent need to develop green and efficient flocculants and corresponding technologies. An amphiphilic copolymer (NPL) was synthesized by a “grafting to” strategy, using acrylamide, 3-chloro-2-hydroxypropyltrimethylammonium chloride, and kraft lignin. NPL consists of a lignin core that is attached to a polyacrylamide branched chain and a cationic group, and has the properties of an amphoteric polyelectrolyte . This structure demonstrates superior flocculation performance on suspended solids. Two typical clay suspensions, kaolin and bentonite, were selected to evaluate the flocculation performance of NPL. The results showed that the turbidity of kaolin and bentonite could be reduced to 2.08 NTU and 0.31 NTU, respectively, by using NPL in combination with polymeric aluminum chloride. The synergistic effect of charge neutralization and bridging was confirmed as the main mechanism of flocculation on the two clay suspensions by a series of characterization techniques, such as zeta potential determination, particle size analysis , and focused beam reflectance measurement. The treatment of high-turbidity wastewater/feedwater with NPL was investigated, and was found to significantly improve the effluent quality. The use of NPL is efficient, environmentally friendly, and technically feasible, and shows excellent potential for the treatment of wastewater.
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Changcheng Wei,Wenna Zhang,Kuo Yang,Xiu Bai,Shutao Xu,Jinzhe Li,Zhongmin Liu
ABSTRACT The most promising method to eliminate CO 2 is to find large-scale and value-added applications of CO 2 as a carbon resource. However, the utilization of CO 2 as feedstock for basic chemicals has long been a great challenge owing to its high thermodynamic stability. Herein, we report the coupling conversion of CO 2 with light alkanes over the HZSM-5 zeolite with much higher aromatic selectivity than light alkanes as the only reactant. A CO 2 conversion of 17.5% and n -butane conversion of 100% with aromatic selectivity of 80% could be achieved by the coupling reaction at the CO 2 to n -butane ratio of 0.475, in which CO 2 not only acted as an agent for balancing hydrogen in the reaction but also partly (~25%) incorporated into the aromatic products. Methyl-substituted lactones (MLTOs) and methyl-substituted cycloalkenones (MCEOs) were identified as key intermediates during the coupling reaction. 13 C isotope labeling experiments, 13 C solid-state NMR, in-situ diffuse reflectance infrared Fourier transform spectroscopy, and density functional theory (DFT)calculations revealed that CO 2 could react with carbonium ions generated from alkane cracking to form MLTOs, which could further get converted into MCEOs, thus generating aromatic compounds . This coupling reaction provides guidance for the direct utilization of CO 2 to produce value-added chemicals with the simultaneous transformation of light alkanes.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
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IF 13.6
Li Li,Ruoning Guo,Jie Gao,Jie Liu,Zhiwei Zhao,Xin Sheng,JunYu Fan,Fuyi Cui
Perfluorooctanoic acid (PFOA) is a representative persistent organic pollutant and its disposal by mechanochemical (MC) technology emerges in recent years. However, degradation mechanism of PFOA especially rupture of C−F bonds during MC process is still unclear. Therefore, we innovatively employed barium titanate as co-milling reagent in MC system to disclose an electron-dominated reduction process. By stimulating piezoelectric effect of BaTiO 3 under MC impact, free electrons were generated. The results implied more than 95.00% degradation and 60.00% defluorination efficiency were obtained after 6 h′ ball milling. DPPH• was used as probe to confirm the existence of piezo-excited electrons, which were further verified to be major reactive species by atmosphere experiments. Thus, PFOA destruction was dominated by reduction process, characterizing by breakage of C−F bonds induced by electrons. Accordingly, the fate of organic fluorides was explored and BaF 2 was identified as final product. The cleavage of carboxyl group initiated PFOA decomposition, following by successive removal of CF 2 groups and elimination of F − . Moreover, the practical experiments and reusable trials implied promising application of this method. Overall, this paper provides a novel perspective for reductive decomposition of PFOA by MC technology and reveals the major role of electrons during reaction process.
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ACS Applied Electronic Materials
·
2022
·
IF 4.494
Yanting Li,Pengfei Zhao,Jie Lao,Chunli Jiang,Bobo Tian,Chunhua Luo,Hechun Lin,Chang Yang,Hui Peng,Chun-Gang Duan
Fabricating devices with functions of biosynapses is one of attractive highlights in the field of artificial intelligence. Optoelectronic synapses are believed to be an important cornerstone of neuromorphic intelligent systems because they can directly process visual input signals. In this work, a transparent and metal-electrode-free optoelectronic synapse with a structure of CuI/ITO is prepared, in which the CuI layer acts as both an active layer and electrode. Some basic functions of biosynapses are realized by this device, including paired-pulse facilitation (PPF), spike-number-dependent plasticity (SNDP), spike-width-dependent plasticity (SWDP), and ″learning-experience″ behavior. Furthermore, this device exhibits the capability of detecting and processing the integrated optical information, and image recognition and memory. This work illustrates the great application potential of CuI in transparent optoelectronic synapse due to its unique properties.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Zhuo Huang,Qinke Cui,Xin Yang,Feifei Wang,Xinxing Zhang
Microplastics (MPs) have caused global concerns due to their detrimental effects on ecosystems and even humans. Recycling aged plastic products ahead of MPs generation can be an effective approach to mitigate increasingly serious microplastic pollution. However, predicting MPs generation remains a great challenge. In this regard, we report a simulation method through associating plastics aging with mechanical failure on a time scale to predict MPs generation and give an experimental verification. The results indicate that the proposed evaluation method has high accuracy for predicting MPs generation from aged polystyrene foams. Under conditions of ultraviolet (UV) irradiation and heat for 1000 h, the aged polystyrene foam generate significant microplastics (6.78 × 10 6 particles/cm 3 ) by water scouring force after the expected aging time (400 h). Furthermore, the experiment results verify the synergistic effect of UV irradiation and heat on polystyrene MPs generation. This work suggests a new strategy to predict MPs generation from aged plastics in complex environments, which provides meaningful guidance for the use and recycling of plastic products.
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Materials Today Communications
·
2022
·
IF 3.662
Seema Singh,Ritesh Patidar,Vimal Chandra Srivastava,Praveen Kumar,Ajay Singh,Shang-Lien Lo
In the present study, ellipsoid-shaped cupric oxide (CuO) with uniform size were synthesized by facile template-free urea-glycerol-assisted hydrothermal approach and consequent heat treatment. The CuO nanospheres possessed tunable pore features with comparatively higher value of a specific surface area (98.4 m 2 g −1 ) and an excellent number of pores size 9.8–12.3 nm. As prepared catalysts exhibited excellent peroxymonosulfate (PMS) activation ability for the treatment of highly toxic perfluorooctanoic acid (PFOA) from aqueous solution. Moreover, a systematic degradation approach was investigated by the study of various operating parameters such as PMS dose, catalyst dose, concentration of PFOA, initial pH, and temperature. Zeta potential measurement confirmed that PMS activation with ellipsoid CuO enhanced the availability of more active Lewis acid sites and show high chemical stability. About 92% PFOA degradation and 78% TOC reduction were achieved within 90 and 120 min respectively at optimum condition of initial pH= 7, catalyst dosage = 0.5 g L −1 , PMS o = 0.5 mM, and temperature= 328 K for a solution of PFOA o = 10 mgL −1 by PMS/ellipsoid CuO system. Scavengers test analysis confirmed that singlet oxygen ( 1 O 2 ) is the most active species which effectively participated in the strong oxidative-reductive mechanism of PFOA degradation. In addition, a two-step pseudo-first-order kinetic model was well fitted, and very little metal leaching was observed via reusing after six cycles. GC-MS analysis was used for identification of the intermediates, a possible stepwise degradation pathway of long-chain perfluorosulphonic acids (PFACs) to shorter chain intermediates with the role of ellipsoid-CuO in PMS activation has been proposed.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 5
·1-9
·
IF 2.8
Chen Jiajia,Dai Fengting,Liu Haotian,He Zhengguang,Gao Hui,Liu Gen
In this work, three specialized oxidases for glucose, lactate and cholesterol are absorbed on carbon microspheres (CSs), which can produce hydrogen peroxide during their substrate-specific enzymatic activity. Electrochemiluminescent (ECL) is generated by the electrochemical reaction between luminol and hydrogen peroxide on an ECL biosensor array, whose light signals are collected by a CCD camera. Under optimum conditions, calibration curves are constructed for glucose, lactate, cholesterol concentrations and ECL intensities. The detection limits of the different biosensors are found to be 12 μM for glucose, 3 μM for lactate and 19 μM for cholesterol. Furthermore, the resulting ECL biosensor array is expected to be an alternative analytical tool in clinical analysis because of its good stability, acceptable precision and reproducibility.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 13
·2212259
·
IF 19
Chengxin Deng,Hongsheng Dong,Keyan Sun,Yan Kou,Hanqing Liu,Weiwei Jian,Quan Shi
Phase change materials (PCMs) have been particularly concerned as infrared stealth functional materials due to their superior thermal management capability. However, traditional PCMs usually behave rigid solid or flowing liquid states with fixed transition temperature, greatly limiting their application especially in multi-band stealth and multiple scenes. Herein, an intrinsically flexible self-healing phase change film used for synchronous visual/infrared stealth for the first time is designed and constructed. The phase change film possesses a solid–solid phase transition behavior with adjustable transition temperature (from 38.8 to 51.1 °C) and enthalpy (from 79.7 to 116.7 J g −1 ), long-term cycling stability (500 cycles), and outstanding flexible and self-healing performance. Remarkably, the phase change film can be customized with different colors and various configurations to exhibit attractive visual stealth functions in multiple scenes. Additionally, owing to phase transition property, this phase change film can possess a thermal management capability and behave infrared stealth performance for objectives at various temperatures. Combining the above unique functions, the intrinsically flexible self-healing phase change film developed in this work may show great potential for applications in the synchronous visual/infrared stealth across a wide range of scenarios and temperatures.
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Materials
·
2023
·Vol. 16
·期 2
·868
·
IF 3.4
Kai Zhang,Kehao Zhang,Yuxiang Ma,Hailong Wang,Junyong Shao,Mingliang Li,Gang Shao,Bingbing Fan,Hongxia Lu,Hongliang Xu,Rui Zhang,Huanhuan Shi
TiO2/Au/BDD composites with a Z-scheme structure was prepared by orderly depositing gold (Au) and titanium dioxide (TiO2) on the surface of a boron-doped diamond (BDD) film using sputtering and electrophoretic deposition methods. It was found that the introduction of Au between TiO2and the BDD, not only could reduce their contact resistance, to increase the carrier transport efficiency, but also could improve the surface Hall mobility of the BDD electrode. Meanwhile, the designed Z-scheme structure provided a fast channel for the electrons and holes combination, to promote the effective separation of the electrons and holes produced in TiO2and the BDD under photoirradiation. The electrochemical characterization elucidated that these modifications of the structure obviously enhanced the electrocatalytic performance of the electrode, which was further verified by the simulated wastewater degradation experiments with reactive brilliant red X-3B. In addition, it was also found that the photoirradiation effectively enhanced the pollution degradation efficiency of the modified electrode, especially for the TiO2/Au/BDD-30 electrode.Keywords:boron-doped diamond;TiO2;Z-scheme;electrocatalysis;wastewater treatment
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