SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Shizong Wang,Jianlong Wang
In this study, cobalt embedded into oxygen and nitrogen co-doped CNTs (Co@N-O-CNTs) was prepared by pyrolysis and used to activate peroxymonosulfate (PMS) for degradation of sulfamethoxazole. The experimental results showed that the content of oxygen precursor had important influence on the catalytic activity of Co@N-O-CNTs. When the content of oxygen precursor was 2 g, Co@N-O-CNTs exhibited better catalytic activity than previously reported Co@N-CNTs. Bulk and surface-bound radicals resulted in sulfamethoxazole (SMX) degradation, in which SMX degradation rate reached 0.247 min −1 with the mineralization of 35.6%. The possible pathway of SMX degradation was proposed based on the identified degradation products. Characterization results indicated that nitrogen, oxygen and cobalt in the structure of Co@N-O-CNTs-2 were active sites for PMS activation. Theoretical calculation suggested that nitrogen and oxygen co-doping created more active sites to activate PMS compared with single nitrogen doping. During the six cycling experiments, Co@N-O-CNTs-2 exhibited good catalytic and structural stability. The influencing factors, including temperature, pH, PMS concentration, chloridion, bicarbonate and humic acids were investigated. This study could provide a way to boost active sites of nitrogen doped carbonaceous materials to effectively activate PMS for degradation of emerging organic pollutants.
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FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Weiyi Zhang,Junmeng Lu,Xue Zhao,Xinglian Xu
The structures of proteins on the interface of oil-in-water emulsions that influence the interfacial film strength are significant to the emulsions stabilization. It is expected that the interfacial protein could be fully recovered based on the competitive displacement of low-molecular surfactant, when the recovery approach and relative parameters are optimized, so that the structural properties of interfacial proteins can be evaluated to clarify their adsorption behaviour and film forming mechanism. In the present study, an optimized and efficient approach to fully recovering interfacial myofibrillar protein (MP) was established by optimizing protein concentration, Tween-20 concentration and different accelerating treatments (agitation or freeze-thawing), for interface-induced structural changes analysis. It was found that the interfacial MP in 2.5 mg/ml protein-stabilized emulsion could be fully recovered in 96 h with 4% (v/v) Tween-20 under agitation treatment. Freeze-thawing treatment could accelerate the desorption process by which interfacial MP in the above emulsion could be fully recovered in 3 cycles with 2% or 3% (v/v) Tween-20 but might cause damage to the MP structure. Based on the established recovery approach, it was concluded that the tertiary structure of interfacial MP unfolded to expose hydrophobic residue branch for interfacial adsorption and film formation, which further caused aggregation of desorbed MP through hydrophobic interaction. While the α-helix decreased due to interface-induced denaturation and the β-sheet increased to improve protein-protein interaction on the interface. These results provided an optimized strategy to analyze interfacial protein structure.
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Soft Matter
·
2021
·Vol. 17
·期 41
·9363-9370
·
IF 3.679
Haifeng Liu,Yifeng Sun,Zhonghui Chen
Hydrophobic/oleophilic sponges are excellent absorbent materials for oil contaminant removal. However, the application is limited in dealing with surfactant stabilized O/W emulsions. The water in the emulsion isolates the contact between the sponge and oil droplets. Consequently, the oil absorption efficiency is not ideal. Herein, to improve the oil absorption efficiency from anionic surfactant stabilized O/W emulsions, water responsive hybrid sponges were reported. To prepare such sponges, water soluble poly(N,N-dimethylaminoethylmethacrylate) (PDMAEMA) was introduced into polydimethylsiloxane (PDMS) sponges using table salt as a template and multi-walled carbon nanotubes (MWCNTs) as mechanical reinforcement in a one-pot method. Upon contact with an O/W emulsion, the water soluble PDMAEMA chain rose to the surface of the sponge, turning the hydrophobic surface into hydrophilic. Next, the tertiary amine groups in PDMAEMA ionized in water and carried positive charges which would cause the coagulation of oil droplets. Finally, the coagulated oil droplets were absorbed immediately by the oleophilic inner part of the sponge through the wicking effect. As a result, a Janus interface was generated in situ and sustained. Such material design synergistically contributed to a satisfactory hexadecane (HD) absorption efficiency of 178 ± 4% in 25 min. In contrast, the PDMS-MWCNT1.0% sponge could only absorb 9.8 ± 0.2% HD. Moreover, these sponges also presented robust mechanical performance and reusability, offering a new route for oil/water separation and oil pollution remediation in open water.
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高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Huifang Yang,Kaihua Huang,Xiaoyu Cao,Xiaoping Huang,Zhanfang Cao,Hong Zhong,Hu Zhou,Jianxian Zeng,Jianrong Xue,Rui Zhang
The flotation performance and hydrophobic mechanism of O-ethyl-N-benzoyl thionocarbamate (EBZTC) on chalcopyrite were first estimated by single flotation experiments, batch adsorption experiments, contact angle measurements, DFT calculation and FTIR analysis. Single flotation experiments illustrated that a flotation recovery of 96.7% was achieved to chalcopyrite when EBZTC was used compared to 90% with SIBX at pH 6.5. Adsorption experiments indicated that the adsorption process of EBZTC on chalcopyrite surface was an exothermic monolayer chemisorption process. Hydrophobic mechanism demonstrated that EBZTC chemisorbed onto the chalcopyrite surface through the chemical reactions of C O and C S groups to the copper species with the formation of C O Cu and C S Cu bonds, which resulted in the coverage of the hydrophobic groups of EBZTC onto the chalcopyrite surface to enhance its hydrophobicity.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yilan Wu,Chan Lei,Jing Li,Yijie Chen,Hongshan Liang,Yan Li,Bin Li,Xiaogang Luo,Ying Pei,Shilin Liu
This study was designed to improve the stability of medium internal phase emulsion by adjusting the electrostatic interaction between gelatin (GLT) and TEMPO-oxidized bacterial cellulose nanofibrils (TOBC). The influences of polysaccharide-protein ratio (1:10, 1:5, and 1:2.5) and pH (3.0, 4.7, 7.0, and 11.0) on the emulsion properties were investigated. The droplet size of TOBC/GLT-stabilized emulsion was increased with the TOBC proportion increasing at pH 3.0–11.0. Additionally, emulsion had a larger droplet size at pH 4.7 (the electrical equivalence point pH of mixtures). However, the addition of TOBC significantly improved the emulsion stability. The emulsions prepared with TOBC/GLT mixtures (mixing ratio of 1:2.5) at pH 3.0–7.0 were stable without creaming during the storage. It was because the formation of nanofibrils network impeded the droplet mobility, and the emulsion viscosity and viscoelastic modulus were increased with the addition of TOBC. These findings were meaningful to modulate the physical properties of emulsions.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Shaolong Wang,Dingding Ye,Hao Liu,Xun Zhu,Zhenfei Liu,Rong Chen,Qiang Liao,Yang Yang
The in-situ H 2 O 2 electrosynthesis by two-electron oxygen reduction reaction employing renewable electricity is a promising alternative to traditional anthraquinone process due to its security, environmental friendliness and excellent cost effectiveness, which requires high-performance, cost-effective and environmental-friendly electrocatalysts . A bamboo-derived O-doped rocky electrocatalyst is developed by facile pyrolysis and acid treatment for high-efficiency electroreduction of O 2 to H 2 O 2 . Three-dimensional interconnected hierarchical pores in rocky electrocatalysts expose abundant electroactive sites and facilitate mass transfer of reaction species. From the results of rotating ring-disk electrode test, a H 2 O 2 selectivity up to 80% and superior electrocatalytic activity of the prepared electrocatalyst are achieved by surface oxygen functionalization induced by acid treatment. At the optimal catalyst loading of 2 mg cm −2 , prominent H 2 O 2 productivity of 1037 mmol g c a t a l y s t − 1 h − 1 with high current efficiency up to 74.1% is achieved at 30 mA cm −2 by air-breathing cathode. Higher H 2 O 2 productivity (1525 mmol g c a t a l y s t − 1 h − 1 ) is yielded by further raising the current density to 50 mA cm −2 . Moreover, the durability test of the cathode through ten consecutive runs demonstrates its great stability for electrocatalytic generation of H 2 O 2 . This work inspires the development of promising biomass-derived electrocatalysts for green and sustainable on-site H 2 O 2 electrosynthesis.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 20
·11736-11748
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IF 4.22
Gao Yuan,Zhou Xinghai,Zhang Maliang,Li Zhenhuan
In view of the disadvantages of concentration polarization and trade-off effects in the application of membrane in desalination field, oxide-nano graphene oxide/polyamide (O-NGO/PA) loose intermediate layer and PA ultra-thin dense layer were introduced to fabricate PA/O-NGO/polyphenylene sulfide composite membrane with sandwich structure via multi-step interfacial polymerization (MS-IP) method. The selective permeation mechanism of ultrathin layer produced by different aqueous monomers (PIP and MPD) was studied, the effect of its physicochemical structure on the relief of concentration polarization phenomenon and the breakthrough of trade-off effect was analyzed. The ultra-thin and dense PA layer mainly played the role of interception and shortened the water molecular penetration path. In the retention test of metal salt solution, compared with the rough surface, it was found that the smooth surface was more conducive to the diffusion of intercepted metal ions into the feed solution, thus alleviating the concentration polarization phenomenon. Graphical abstract
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ANALYTICAL SCIENCES
·
2020
·Vol. 36
·期 10
·1203-1209
·
IF 2.049
Wei ZENG,Dongyan HUANG,Gangbing ZHU,Baohe LV,Yinhui YI
In this work, by functionalizing MoS2 quantum dot with 3-aminobenzeneboronic acid, a novel multifunctional quantum dot (denoted as B-MoS2 QD) was obtained and used successfully for a fluorescence nanoprobe for detecting o-dihydroxybenzene (o-DHB). Transmission electron microscopy, fluorescence spectrum, UV-vis spectrum and fluorescence lifetime were used to investigate the prepared nanoprobe. The results show that the B-MoS2 QD nanoprobe can exhibit strong fluorescence and excellent light fastness owing to the coupled effect from the MoS2 QDs and boronic acid; interestingly, the vicinal diols structure from its surface can bridge covalently with o-DHB, resulting in the fluorescence quenching of B-MoS2 QDs and selective recognition toward o-DHB. With the increasing of o-DHB concentration, the nanoprobe fluorescence would gradually decrease. By measuring the fluorescence intensity of B-MoS2 QDs, a wide linear range from 0.1 to 200.0 μM with a low detection limit of 0.025 μM was obtained for o-DHB analysis; meanwhile, this fluorescence nanoprobe possesses excellent selectivity for the selective detection of o-DHB from its analogues.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Zideng Dai,Xinyu Xu,Zhaoming Guo,Kun Zheng,Xue-Zhi Song,Xiuyu Qi,Zhenquan Tan
Ultra-thin two-dimensional nanosheets have attracted increasing attention due to their great application prospects in nanomaterial science and biomedicine. Herein, we report the preparation of exfoliated raw and oxidized 4-layer Ti 7 O 13 (O-Ti 7 O 13 ) and their ability to produce reactive oxygen species (ROS). The results show that O-Ti 7 O 13 nanosheets can effectively produce ROS induced by X-ray irradiation. The 4-layer nanosheets can quickly load doxorubicin (DOX) within 5 min with a high loading rate to obtain a novel nanodrug system through their electrostatic adsorption capacity, and they exhibit a sustained release behavior. In this way, chemotherapy, radiation therapy and photodynamic therapy effectively combine for cancer synergistic treatment. We evaluated the cytotoxicity, cellular uptake and intracellular location of the O-Ti 7 O 13 nanosheet-based drug delivery system in A549 lung cancer cells. Our results show that the O-Ti 7 O 13 /DOX complex is more cytotoxic to A549 cells than free DOX since a low concentration of loaded DOX (10 μg/mL) with a low dose of X-rays can cause the complete apoptosis of tumor cells. This work reveals that the therapeutic effect of DOX-loaded O-Ti 7 O 13 nanosheets is strongly dependent on their loading mode, and the effects of chemotherapy and photodynamic therapy are enhanced under X-ray irradiation, which allows O-Ti 7 O 13 nanosheet use as a photo-activated drug carrier. This work provides a new strategy for preparing 2D metal oxide nanosheets toward biomedical applications.
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Journal of Ocean University of China
·
2020
·Vol. 19
·期 4
·865-873
·
IF 0.802
Zheng Bingbing,Pang Wenhui,Zhao Yangguo,Guo Liang,Gao Mengchun,Jin Chunji,She Zonglian
The wide application of antibiotics in aquaculture requires an efficient treatment of the wastewater before discharging it into the environment. During the wastewater treatment, the influence of antibiotics on the performance of bioreactor should be well revealed due to their toxicity to the functional microbial community. In this study, the effect of feeding 10–30 mgL −1 sulfamethoxazole (SMX) in influent on the performance of an anoxic/oxic-moving bed biofilm reactor (A/O-MBBR) treating mariculture waste-water and the responding change of biofilm microbial communities was investigated. The COD average removal rate remained at 94.61%–97.34% with the dosage of SMX. Compared with that, the nitrifying removals of NH 4 + -N and NO 2 − -N were violently inhibited by 30 mgL −1 SMX and denitrifying removal of the NO 3 − -N decreased obviously with 20 mgL −1 or more SMX. The microbial community in the successful startup bioreactor was relatively abundant, while the diversity of microbial community decreased with the increase of feeding SMX. The salt-tolerant and SMX-resistant genera Arcobacter, Thiothrix, Desulfuromusa and Nitrosomonas were gradually enriched and finally played a vital role in converting COD and recycling nitrogen and sulfur. Hence, the present A/O-MBBR reactor with the salt-tolerant functional microbiota achieved efficient removal of pollutants in the presence of low concentration (e.g., 10 mg L −1 ) SMX.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 99
·期 2
·458-466
·
IF 1.687
Xingang Li,Chenggong Zheng,Zeli Wang,Hong Sui,Lin He
The key step for the adsorption-desorption engineering process is the reversible in-situ desorption of the adsorbent without VOCs (volatile organic compounds) accumulation. Our previous results show that the mesoporous silica gel performs well in adsorbing and desorbing the VOCs due to their capillary condensation in the mesopores. However, the microporous silica performs better in adsorbing though poorer in desorbing VOCs because of the direct interaction between VOCs molecules and the adsorbent wall in the micropores. Herein, the adsorption and desorption of o- xylene on two silica gels (SG) with different pore size distribution by vacuum swing adsorption (VSA) has been systematically studied. The equilibrium adsorption and desorption experiments of two kinds of silica gels at different loading heights in fixed bed show that the concentration front of o- xylene in microporous SG disperses slowly. However, the concentration front of o- xylene in mesoporous SG is significantly dispersed. To improve the overall efficiency of adsorption-desorption, the mesoporous and microporous SGs are loaded together in the fixed bed. It was found that the increase in the microporous SG loading percentage facilitated the adsorption capacity but deteriorated its desorption efficiency, while the opposite occurs to the mesoporous SG. After optimization, it was observed that minimal energy consumption (1.295 kWh/m 3 VOCs gas) was used when the adsorption column is loaded with 60% SG B at the inlet and 40% of the SG A at the outlet end for o- xylene vapour adsorption. This finding will be useful for designing adsorbent loading in the adsorption column.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Renliang Lyu,Ting Xia,Cheng Liang,Cheng Zhang,Zeqin Li,Lichun Wang,Yi Wang,Ming Wu,Xiaogang Luo,Jiayu Ma,Cunwen Wang,Caili Xu
Three kinds of novel environmentally benign and high-efficiency crude oil demulsifiers were prepared using methoxy polyethylene glycol (MPEG) to modify alkylated carboxymethyl chitosan (ACMC). Structures of the demulsifiers were confirmed using FT-IR and 1 H NMR, and the relationship between surface tension and concentration was tested. Demulsification performance was investigated using the bottle test method with oil-in-water (O/W) emulsions that were prepared in lab conditions. The demulsification efficiency was as high as 79.1 %–84.9 %, and the possible mechanism of the demulsification process is discussed. Results show that MPEG-grafted ACMC (MPEG-ACMC) has a promising application as a demulsifier for dealing with emulsified O/W crude oil.
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