COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Haiwang Wang,Li Chao,Xinfang Wei,Jinlong Li,Cheng Ji,Bingzhu Wang,Xiwei Qi,Pengcheng Hu,Yifan Ying,Mengping Tian
Nowadays, the polymer flocculation technology has been widely used in the treatment of oil sand tailings pollutants. However, the most commonly used polyacrylamide flocculant has encountered some problems, such as low flocculation efficiency and severe secondary pollution. In this paper, an organic-inorganic composite high-efficiency flocculant with self-degradation was designed and prepared. Furthermore, in order to analyze the synthesis mechanism of the composite material, the functional groups of the material were investigated by Fourier transform infrared spectroscopy (FTIR). At the same time, the morphology and structure were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Meanwhile, the crystal structure was recorded by XRD . In addition, the flocculation efficiency of the composite flocculant was determined by measuring the turbidity removal of the kaolin suspension. Apart from this, the flocculation parameters were optimized by central composite design (CCD) experimental design and response surface methodology (RSM). Finally, the self-degrading property of the flocculant was tested under light conditions. The characterization data of the material indicated that the synthesis mechanism is that under the ultraviolet light condition, the acrylamide monomer undergoes free radical polymerization under the action of active free radicals on the surface of the core-shell structure SiO 2 -TiO 2 to form an organic-inorganic composite flocculant. In addition, the optimized experimental results showed that the optimal turbidity removal conditions were followed: V TBOT /m SiO2 of 6.66 mL/g, flocculant dosage of 50 ppm and kaolin suspension concentration of 1.5 wt%. Ultimately, the degradation experiment showed that the prepared organic-inorganic composite flocculant has nice self-degradation performance, and the self-degradation efficiency reaches over 90% within two hours. In summary, this work has greatly enriched the knowledge of oil sand tailings treatment.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Nianbing Zhong,Ming Chen,Haixing Chang,Tianheng Zhang,Zhengkun Wang,Xin Xin
We present a high-selectivity photochemical fiber-optic sensor in which a plastic optical fiber (POF), TiO 2 -based composite, and polymer membrane are coupled for detection of phenol concentrations in water. A thinned POF is coated with TiO 2 -based composite, which is composed of Er 3+ :YAlO 3 /SiO 2 /TiO 2 (EYST) and acts as the sensing region. The EYST coating shows good light-inducing capacity at the core–coating interface and high photocatalytic activity in the visible light region. The polymer membrane is synthesized using PEBA2533 doped with β-cyclodextrin and shows high phenol selectivity and permeability; thus, phenol molecules can freely permeate the membrane and are then transferred, become attached to the surface of TiO 2 nanoparticles, and are photocatalytically degraded. Photocatalytic degradation of phenol improves the refractive index (RI) and absorbance of the solution because of the photocatalytic byproducts; consequently, the transmitted output light intensity of the sensor changes, and the phenol concentration is accurately detected by measuring the change in the light intensity. Experimental results indicate that the prepared device detects phenol in water with high selectivity and pH independence; in phenol detection, the novel sensor shows a sensitivity of −0.195 × 10 −3 (mg/L) −1 and a low limit of detection of 40 μg/L.
研究领域:
环境科学
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分析化学
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材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Hao Yin,Jie Zhao,Yuqi Li,Yiqiang Liao,Liulian Huang,Hui Zhang,Lihui Chen
Superwetting interfacial porous membranes with different wettabilities have enormous potential for wastewater treatment. The wettability of most smart separation membranes is controlled by external environmental factors such as temperature, pH, and pressure. In a constant environment, they have only one kind of wettability and can separate only one type of emulsion, and in multiple extreme environments, they become “unintelligent” and even lose their separation ability. Inspired by China's “Face-Changing in Sichuan Opera,” we have prepared a novel electrospun SiNPs/ZnNPs-SiO 2 /TiO 2 (SZST) nanofiber membrane by a calcining-spraying method. The obtained membrane can rapidly switch its wettability in various environments for the controllable separation of both oil-in-water and water-in-oil emulsions. The advanced electrospinning, combined with micro-nano hierarchical structures, greatly improved the wettability and porosity of the membrane, making the separation efficiency more than 99% stable. Additionally, the flux was maintained at about 2000 L/m 2 h. Interestingly, the separation efficiency showed almost no change in various harsh environments (e.g., strongly acidic and alkaline conditions, high or low temperatures, and even salty media), and the developed membrane exhibited excellent recyclability. In addition to good corrosion resistance and chemical stability, the membrane demonstrated excellent fire and frost resistance. Therefore, the SZST nanofiber membrane has great practical value in industrial production.
研究领域:
材料科学
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环境工程
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化学工程
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
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2024
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IF 3.7
Linsong Wu,Haoran Shi,Xingzhi Wang,Shiwei Lu,Xiang Chen
In this study, a series of nano-TiO2 composite materials, including nano-TiO2, nano-SnO2/TiO2, nano-SiO2/TiO2, and nano-Fe2O3/TiO2, were successfully synthesized via the gaseous detonation method. Comprehensive characterization of the synthesized samples was carried out through X-ray diffraction (XRD), transmission electron microscopy/high-resolution TEM (TEM/HRTEM), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), Brunauer–Emmett–Teller (BET) method, and Fourier transform infrared (FTIR) analysis, which unveiled the significant influence of precursor types on the microstructure of the composite materials. Specifically, the incorporation of Sn4+ promoted the transformation of TiO2 to the rutile phase, reducing particle sizes from 25 to 19 nm and increasing the specific surface area from 44 to 86 m2/g. In contrast, the introduction of SiO2 impeded the rutile phase formation, leading to a marked reduction in particle size to 14 nm and an enhancement of the specific surface area to 104 m2/g. Furthermore, the presence of Fe3+ promoted the formation of the rutile phase and enabled particle growth to 44 nm. These findings not only deepen the understanding of structural control in the synthesis of nano-TiO2 composite materials via the gaseous detonation method but also highlight the critical role of precursor selection in determining the properties of the resulting materials.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
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2013
·Vol. 138
·期 18
·5495-5502
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IF 3.969
Xiao-Mei He,Gang-Tian Zhu,Xiao-Shui Li,Bi-Feng Yuan,Zhi-Guo Shi,Yu-Qi Feng
SiO2–TiO2 composite fibers, prepared by electrospinning, were successfully applied to the rapid enrichment of phosphopeptides using a lab-in-syringe approach for the first time. Because of their large surface area, mesoporous structure, extraordinary length and appropriate Lewis acidity, the as-prepared SiO2–TiO2 composite fibers exhibited high selectivity and capacity in the enrichment of phosphopeptides from the digestion mixture of β-casein and bovine serum albumin (BSA), as well as human blood serum and nonfat milk. The targeted phosphopeptides could be easily enriched and detected even when the total amount of β-casein was decreased to only 10 fmol, indicating the high detection sensitivity of this method. In addition, the whole enrichment extraction procedure can be finished in less than 3 min, which can avoid or decrease the degradation of endogenous phosphoproteins by proteases released ex vivo during time-consuming treatments. The developed method is rapid, cost-effective, selective, sensitive, operationally simple, and does not require any harsh conditions and intricate equipment, providing an ideal candidate for the enrichment of phosphopeptides from complex biological samples either in the lab or in the field.
研究领域:
分析化学
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蛋白质组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2018
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IF 1.2
Bo Ge,Lu Han,Bo Gao,Tingxiao Zhang,Xiuling Li,Xiaotao Zhu,Xipeng Pu,Wenzhi Li
A mesoporous SiO2-TiO2-x composite without any modification was obtained to separate oil-in-water and water-in-oil emulsions solely by gravity. To simulate the actual pollution treatment process in sewage treatment plants, adsorption and degradation properties were studied after the initial emulsion separation. The research result indicates that the reported mesoporous SiO2 can be employed as an excellent absorbent and catalyst carrier. After light irradiating for 120 min, the degradation efficiency of SiO2-TiO2-4 for Rhodamine B, methyl orange, methylene blue, and ciprofloxacin hydrochloride reaches 99.3%, 91.5%, 98.7%, and 96.2%, respectively.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Toxics
·
2024
·Vol. 12
·期 2
·99
·
IF 3.9
Jintao Yu,Yuning Xuan
Volatile organic compounds (VOCs) are prevalent soil contaminants. During the ex situ soil remediation process, VOCs may overflow from the soil and cause gas to diffuse into the atmosphere. Moreover, some VOCs, such as trichloromethane, are categorized by the EPA as emerging contaminants, imparting toxicity to organs, and the endocrine and immune systems, and posing a huge threat to human health and the environment. To reduce VOCs’ emissions from contaminated soil, aqueous foam suppression is a prospective method that provides a durable mass transfer barrier for VOCs, and it has been widely used in odor control. Based on an aqueous foam substrate, in order to enhance the foam’s stability and efficiency of suppression, SiO2–TiO2-modified nanoparticles have been used as stabilizing agents to improve the mechanical strength of liquid film. The nanoparticles are endowed with the ability to photocatalyze after the introduction of titanium dioxide. From SEM imaging, IR, and a series of morphological characterization experiments, the dispersibility of the SiO2–TiO2-modified nanoparticles was significantly improved under the polar solvent, which, in turn, increased the foam duration. The foam dynamic analysis experiments showed that the foam liquid half-life was increased by 4.08 h, and the volume half-life was increased by 4.44 h after adding the novel synthesized nanoparticles to the bulk foam substrate. From the foam VOC suppression test, foam with modified nanoparticles was more efficient in terms of VOCs’ suppression, in contrast with its nanoparticle-free counterparts, due to the longer retention time. Moreover, in a bench-scale experiment, the SiO2–TiO2nanoparticles foam worked against dichloroethane, n–hexane, and toluene for almost 12 h, with a 90% suppression rate, under UV irradiation, which was 2~6 h longer than that of UV-free SiO2–TiO2nanoparticles, the KH–570-modified nanosilica foam, and the nanoparticle-free bulk foam. XPS and XRD results indicate that in SiO2–TiO2nanoparticles, the proportion of titanium valence was changed, providing more oxygen vacancies compared to raw titanium dioxides.Keywords:volatile organic compounds;emerging pollutants;aqueous foam suppression;nanoparticle silica;TiO2photocatalysis
研究领域:
环境科学
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纳米技术
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土壤修复
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Chaoyou Tao,Lin Zhang
Multifunctional thin films with superhydrophilicity, broadband antireflective performance, humidity resistance and outstanding mechanical robustness are essential as for their wide applications. However, so far, it remains a big challenge to take into consideration all these properties simultaneously due to the structural contradiction. Herein, we develop an effective dip-coating process to prepare hybrid thin films with mechanical robustness, high transmittance, super-durable moisture resistance, excellent photocatalytic activity and durable superhydrophilicity. Three different nanoparticles were deposited sequentially to construct the above thin film and the maximum transmittance of this particular thin film reached ∼96.0%. The film surface showed an excellent superhydrophilicity (water contact angle ≈3.0°), and antifogging property. The superhydrophilic thin film could keep its property for more than 20 days. The transformation from hydrophilicity to superhydrophilicity of the thin film could be readily realized by UV irradiation. Moreover, its self-cleaning property could be retained after reduplicative storage and UV illumination cycles. Sponge washing test, water drop impact, pencil hardness test and tape peeling test revealed that the thin film possessed outstanding mechanical robustness. Methylene blue photodegradation was chose to weigh the photocatalytic activity of the hybrid thin film. In addition, the thin film shows excellent humidity-resistance at high temperature, and the excellent performance is due to its closed-surface structure. The closed-surface multifunctional thin films pave way toward use in solar cells, high-rise architecture windows under severe climate conditions.
研究领域:
材料科学
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纳米技术
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Nianbing Zhong,Ming Chen,Yihao Luo,Zhengkun Wang,Xin Xin,Bruce E. Rittmann
We present a novel UV–visible-light photocatalytic optical hollow-fiber in which a hollow optical fiber (HOF) and TiO 2 -based composite are coupled for enhancement of photocatalytic activity toward degradation of 4-chlorophenol (4-CP). A HOF was coated with a TiO 2 -based composite composed of Er 3+ :YAlO 3 /SiO 2 /TiO 2 (EYST) and acting as the photocatalytic element. The EYST coating showed good light-inducing capacity at the fiber-coating interface and high photocatalytic activity driven by UV–visible light. The photocatalytic activity of the fabricated photocatalytic HOFs was investigated for degradation of 4-CP in aqueous solution in the wavelength spectrum of 360–780 nm. Examined were the effects of the EYST coating gradient and reactor operating conditions (pH and temperature) on the degradation of 4-CP. The EYST-coated HOF significantly enhanced the 4-CP degradation, dechlorination, and mineralization, compared to pure TiO 2 -coated HOF and EYST-coated solid optical fibers. Specifically, high photocatalytic activity was obtained when the EYST coating thicknesses at the HOF’s incident end and HOF’s hemispherical end were 10 and 160 μm, the pH was 6.0, and temperature was 55 °C.
研究领域:
环境科学
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光学工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Han Zhang,Xuan Wang,Hao Ding
Herein, SiO 2 -TiO 2 composite (STC) photocatalysts were prepared through placing SiO 2 microspheres in TiOSO 4 solution and calcining at high temperature. Using STC (containing only 5.09 wt% TiO 2 ), the degradation rate to MO with a concentration of 10 ppm was 100% at 50 min of UV illumination. The cost of the photocatalyst and the cleanliness of the preparation process were ensured due to the use of TiOSO 4 as the titanium source and the water as the solvent. Therefore, not only the photocatalytic effect and application performance of TiO 2 were improved, but realized the cleanliness of the preparation process and reduced the cost.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Guangyu Wang,Shaoguo Wen,Suping Qian,Jihu Wang,Changrui Wang,Yabo Chen
SiO 2 /TiO 2 composites were fabricated from KH-570 modified nano-titanium dioxide and nano-silica. The waterborne nano-hybrid hyperbranched acrylic emulsion was synthesized by in-situ polymerization using waterborne acrylic acid as the auxiliary anti-corrosion material. The SiO 2 /TiO 2 composites were characterized by Fourier transform infrared spectroscopy, thermogravimetic analysis, and X-ray photoelectron spectroscopy. The structure and morphology of the waterborne nano-hybrid hyperbranched acrylic emulsion were characterized by scanning and transmission electron microscopies. Waterborne nano-hybrid hyperbranched coating based on waterborne nano-hybrid hyperbranched acrylic emulsion. The anti-corrosion properties of the waterborne nano-hybrid hyperbranched acrylic coating were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy. In salt-spray and wet adhesion tests, the waterborne nano-hybrid hyperbranched coating demonstrated an excellent anti-corrosion effect and the salt spray resistance exceeded 1000 h. In this paper, a novel environmentally friendly waterborne nano-hybrid hyperbranched acrylic emulsion was synthesized by in-situ polymerization method, and the corrosion resistance test proved that the resin has excellent anti-corrosion performance. It has certain application value in metal protection.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 10
·1397
·
IF 3.236
Meiman Peng,Liqin Wang,Lang Guo,Jinyi Guo,Liping Zheng,Fuwei Yang,Zhuang Ma,Xing Zhao
Water can trigger freeze–thaw cycles, acid rain corrosion, and microbial colonisation, all of which destroy stone. Water is one of the most influential factors in the destruction of outdoor stone heritage. Therefore, materials with excellent hydrophobic properties and durability are urgently required to effectively retard long-term stone weathering. In this study, two nanoparticles, TiO2and SiO2, were used to modify dodecyltrimethoxysilane (DTMS), a waterproof coating commonly used for stone heritage protection, to fabricate nanocomposite superhydrophobic coatings. The micromorphology, water repellence (water contact angle and capillary water absorption), suitability to protect stone heritage (color change and water vapor permeability), and durability (thermal, light, and chemical stability) of DTMS and nanocomposite coatings were evaluated. The scanning electron microscope (SEM) images revealed that adding 0.5% (w/w) SiO2produced nanoscale roughness on the sandstone surface, leading to superhydrophobicity. The results of ultraviolet -visible (UV–Vis) spectrophotometer showed that adding 0.01% TiO2shielded more than 90% of UV light but accelerated the decrease in the contact angle under UVA irradiation. The addition of SiO2was able to avoid the detrimental effect of TiO2under UV light. The thermogravimetric analysis (TGA) results showed that both SiO2and TiO2nanoparticles improved the thermal stability of the coatings. In particular, the fabricated nanocomposite coating, SiO2and TiO2co-modified DTMS, had excellent water repellence, low color change and outstanding durability, and retained about 85% of the water vapor permeability of the stone, showing promise for stone protection.
研究领域:
材料科学
·
文化遗产保护
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）