Journal of Environmental Sciences
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2024
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IF 5.9
Jianlong Guo,Jingjing Du,Li Yan,Jianbo Shi
Persistently high arsenic levels in drinking water threaten underprivileged areas worldwide. Although nanomaterials exhibit exceptional arsenic removal properties, their implementation presents challenges. We converted N-methylimidazole-modified polyvinyl chloride into a granular anion exchange resin (PNAXRs) using an environmentally friendly and gentle synthesis method. Additionally, a unified approach for embedding nanomaterials within these resins was proposed, yielding a TiO 2 composite resin (TiO 2 @PNAXRs). Structural characterization confirmed the successful grafting of imidazolium cations with anion-exchange properties onto polyvinyl chloride side chains. BET analysis indicates a high specific surface area of 70.31 m 2 /g for the PNAXRs. TGA curves demonstrate the successful encapsulation of approximately 24.9% TiO 2 within the composite resin. The SEM-EDS results show a uniform distribution of TiO 2 in the PNAXRs, which facilitates the effective utilization of TiO 2 . Adsorption experiments in conjunction with XPS analysis provided insights into the dual role of inner-sphere complexation and ion exchange in the adsorption mechanism of As(V) by TiO 2 @PNAXRs. In dynamic adsorption tests utilizing high-As(V) groundwater from the Datong Basin as the influent, TiO 2 @PNAXRs demonstrated the ability to produce effluents that meet the World Health Organization's recommended limit for arsenic in drinking water, with a capacity of 1780 bed volumes. These findings support the use of PNAXRs as ideal matrices for TiO 2 and their practical application in As(V) removal processes.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Hongpeng Zheng,Guangguang Xiang,Ali Hussein Khalaf,Bing Lin,Yingying Wang,Hailong Zhang,Junlei Tang,Yanli Zhou,Li Liu
Common techniques for creating novel coatings include chemically modifying inorganic fillers and exploring how modifications affect coating service performance. However, it frequently takes a lot of time and tedious attempts to get the ideal alteration degree for fillers. Although the surface energy of the fillers is thought to be a significant thermodynamic parameter , it is still unknown how chemical modification affects surface energy and how the properties of fillers in a coating relate to the quantization difference of thermodynamic parameters. In this study, the impact of chemical modification on the quantization difference of nano-TiO 2 surface energy has been uncovered. Creating a “wetting-reagglomeration-adsorption” isogram by utilizing three surface interfacial parameters has also been achieved: the contact angle between the liquid resin and the filler, the driving energy of the filler reagglomeration, and the polymer molecules' diffusion energy at the filler/coating interface. The relationship between the quantitative difference of thermodynamic parameters and the dispersion, compatibility and interfacial strength of the fillers in the waterborne epoxy was predicted by the isocontour map. From the isocontour map, the modified nano-TiO 2 fillers with 4.04 APTES molecules/nm 2 shows the minimum ∆ W a of 16.17 mJ/m 2 and the maximum W s of 23.15 mJ/m 2 in the composite coating , which is predicted to exhibit the best dispersibility and the strongest interfacial strength. The prediction results were successfully verified by the techniques of microscopic morphology observation (TEM and SEM), mechanical properties tests (DMA and tensile tests), and corrosion resistance tests (EIS and salt spray tests). This work has a significant guiding role in the development of the filler modifications for the creation of novel coatings.
研究领域:
材料科学
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化学工程
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表面化学
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产品关联
DOI
高影响因子
Scientific Reports
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2017
·Vol. 7
·期 1
·1-12
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IF 4.259
Xiong Zhu,Lin Haibo,Liu Fu,Xiao Peng,Wu Ziyang,Li Tiantian,Li Dehong
Instability of superwetting surface is the stumbling block of flexible polymeric membranes for continuous separation of water-in-oil or oil-in-water emulsions. Manipulation of rigid superwetting nano-TiO 2 on hierarchical poly(vinylidene fluoride) (PVDF) membrane by mimicking the plant roots holding soil behaviour enabled the generation of robust superwetting surface withstanding the harshly physical and chemical torture. The unique interface combination, which fabricated by a compacted nano-layer with the thickness of ~20 μm, was disclosed by systematic structure characterization. As demonstrated by SEM, LSCM and nano-CT, the pristine PVDF membrane with large quantities of cilia-like micro/nano-fibrils can function as the plant roots to capture, cage and confine the nanoparticles to form a robustly rigid nano-coating. The as-prepared membranes showed excellent durable separation performance both in varieties of stabilized water-in-oil and oil-in-water emulsion separation for a long term with few nanoparticles loss in a continuous crossflow mode. The strategy of assembling rigid inorganic nano-particles on flexible surface offers a window of opportunity for preparation of robust organic-inorganic hybrid membranes not only for continuous oil/water emulsion separation, but also for other functional application, such as electric conduction, heat conduction, ion exchange, and in membrane catalytic reactors etc.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
Nanotoxicology
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2016
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IF 7.913
Liwen Qiang,Xiaoyu Pan,Lingyan Zhu,Shuhong Fang,Shengyan Tian
Nano-titanium dioxide (nano-TiO2) is one of the most universal engineered nano-materials while perfluorooctanesulfonate (PFOS) is a typical new persistent organic pollutant. They are widely used and present in aquatic environment. In this study, a novel semi-static multilayer microcosm was setup to investigate the impacts of nano-TiO2 on PFOS bioaccumulation in fish species [Danio rerio (D. rerio), Ctenopharyngodon idella (C. idella), Hypostomus plecostomus (H. plecostomus)] living in different vertical layers. As a result of aggregation and deposition, the concentration of TiO2 increased from upper to bottom layers in the water column. Concomitantly, due to adsorption of PFOS on the nano-TiO2 particles, PFOS also displayed an increasing trend from upper to bottom layer. Owing to ingestion of the TiO2–PFOS complexes, more PFOS was taken-up by fish. With the aid of intestinal fluid, PFOS was readily released from TiO2 particles and absorbed by fish. As a result, accumulation of PFOS in whole fish was facilitated and the bioaccumulation factors of PFOS in D. rerio, C. idella and H. plecostomus were 3.01, 2.42 and 1.11 times of that in the groups without TiO2. However, TiO2 aggregates were too large to penetrate biological membranes to participate body circulation, and no significant accumulation of TiO2 was observed in fish muscle. The results suggested that the ecological risk of PFOS could be enhanced due to the presence of nano-TiO2 in water.
研究领域:
环境科学
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毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2010
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IF 1.669
Xiang-Chen Che,Yu-Zi Jin,Youn-Sik Lee
Stable nano-TiO 2 /polyurethane (PU) emulsions were prepared via in situ reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization of 2-hydroxyethyl acrylate (HEA)-capped PU macromonomer, using azobisisobutyronitrile (AIBN) as a radical initiator and 2-{[(butylsulfanyl)carbonothioyl]sulfanyl} propanoic acid (BCSPA) anchored onto TiO 2 nanoparticles (TiO 2 -BCSPA) as a RAFT agent. When the molar ratio of AIBN to TiO 2 -BCSPA was changed from 1:3 to 1:10, the polydispersity index (PDI) of polymers in the emulsions decreased from 1.83 to 1.06, due to more effective RAFT polymerization in the emulsions. The TiO 2 nanofillers were well-dispersed throughout the polymer films . The tensile strengths of the nanocomposite films were significantly enhanced due to coordination bonding between the TiO 2 nanofillers and the –COOH end groups of the polymers, as evidenced by the FT-IR spectral data.
研究领域:
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
JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 131
·期 3
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IF 1.395
Peng Fei,Benhua Fei,Yan Yu,Hanguo Xiong,Jun Tan
In this study, bamboo fiber/high-density polyethylene (HDPE) composites were prepared, and the effects of nano-TiO 2 on their thermal properties and crystallization behavior were investigated via thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results show that the addition of nano-TiO 2 improved the thermal stability and had a dual function in the crystallization behavior of the composites. On one hand, it functioned as a nucleating agent. The addition of 2 wt % nano-TiO 2 promoted the crystallization, which caused the increase of the crystallization rate and crystallinity degree, as well as the micronization of the crystalline grain. On the other hand, intermolecular hydrogen bonds and covalent bonds were formed between nano-TiO 2 and the polymer matrix, which hindered the crystallization of the composites. When the content of nano-TiO 2 was continually increased, the inhibitory effect of the crystallization was gradually enhanced, which resulted in a decrease in the crystallization rate and crystallinity degree of the composites. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39846.
研究领域:
材料科学
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聚合物工程
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DOI
高影响因子
APPLIED CLAY SCIENCE
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2017
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IF 3.101
Sen Lin,Shiyong Sun,Kexuan Shen,Daoyong Tan,Hongping Zhang,Faqin Dong,Xiaoxin Fu
Photocatalytic microcompartments have attracted increasing interests in the field of photocatalytic degradation . This work focused on the construction and characterization of a novel photocatalytic microsystem comprising polydopamine-modified TiO 2 nanoparticles (NPs) dispersed in clay-based colloidosomes, utilizing partially hydrophobic montmorillonite particles as building blocks for colloidosome membrane assembly. Assessment of photocatalytic activity was performed by photocatalytic degradation of methylene blue and rhodamine B, with the small molecule dyes decomposing within the compartmentalized microsystems. Encapsulation of TiO 2 NPs within the clay colloidosomes enhanced the efficiency of photocatalytic degradation. The results showed a selective degradation of methylene blue in the presence of rhodamine B, with associated λ MB /λ RhB of 2.04. The present study indicates that photocatalytic semiconductor NPs encapsulated in clay colloidosomes form a promising microsystem with great potential for application in environmental remediation.
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
JOURNAL OF MEMBRANE SCIENCE
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2014
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IF 4.908
Xipeng Li,Yingbo Chen,Xiaoyu Hu,Yufeng Zhang,Linjia Hu
Novel poly(vinyl alcohol) (PVA)/poly(vinylidene fluoride) (PVDF) hollow fiber composite membranes modified with nano-TiO 2 were prepared by a dip-coating method and they are suitable to be utilized in dye desalination and wastewater treatment . Glutaraldehyde (GA) was used as a cross-linker for the composite polymer membrane in order to enhance the chemical, thermal as well as mechanical stabilities. The surface morphologies and chemical structures of modified membranes were observed by scanning electronic microscopy (SEM), energy dispersive spectroscopy (EDS) and FTIR spectroscopy . Zeta potential of the membrane surface was used to analyze the membrane separation performance. Separation efficiency of dye and salts through novel PVA/PVDF composite membrane was dramatically influenced by dye concentration, salts concentration, pH and temperature of feed solution. Fouling and thermal stability of the membrane were also evaluated with CR, NaCl, and Na 2 SO 4 as model compounds. The separation datas showed that the 1 g/L nano-TiO 2 modified membrane presented highest performance in terms of the rejections to CR, MO, and MB being 94±2.57%, 52.1±2.45%, and 92±2.20%, respectively. And all the PVA composite membranes had no rejection to salts (NaCl, Na 2 SO 4 ). Compared with PVA composite membrane, the PVA composite membrane modified with nano-TiO 2 has higher separation efficiency, antifouling and thermal stability.
研究领域:
材料科学
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环境工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
Materials
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2021
·Vol. 14
·期 20
·6038
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IF 3.623
Huan Shuai,Yuxin Wang,Jiao Wang,Gaoxiang Du,Daimei Chen,Yu Liang
In this paper, a TiO2/black talc composite photocatalyst was prepared by the sol-gel method using TBOT as titanium source and black talc as carrier. Rhodamine B was used as the targeted pollutant to study the adsorption role of carbon in black talc. The results showed that with the adsorption-degradation cycles, the illumination time can be reduced by 40%. The adsorption rate and degradation rate of the composite photocatalyst was also increased. The degradation rate of Rhodamine B reached more than 95%, which fully shows the synergistic effect between TiO2nanoparticles and black talc. In this way, the adsorption-degradation coupling of the photocatalyst could be realized.Keywords:nano-TiO2particles;black talc;characteristic adsorption;photodegradation;synergistic effect
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
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IF 6.5
Hui Liu,Long Yan,Feiyue Wang
A unique hybridized antioxidant named TiO 2 -KH550-PA, of which silane modified nano-TiO 2 particles were grafted with 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid by acylation reaction, was applied to intumescent fire-retardant coatings for cable. Through fire protection test, contact angle test , thermogravimetric test and UV-ageing test, the effects of TiO 2 -KH550-PA on hydrophobicity , flame retardancy, smoke suppression, anti-ageing and charring performance for coatings were evaluated. The obtained results indicate that the TiO 2 -KH550-PA can enhance the hydrophobicity of the coating, thereby reducing the adhesion of dust on the coating surface . Additionally, TiO 2 -KH550-PA has a greatly promoting role in strengthening the fire protection abilities of the coating, but an appropriate amount is the key. Compared to coatings without composite, the intumescent fire-resistant coating for cable containing 1 wt% TiO 2 -KH550-PA (IFRCC 2 ) exhibits excellent fire protection performance, including a prolongation by 2.6 times in failure time, an increase by 1.7 times in char layer height, and an increase by 0.4 times in light transmittance for smoke density test. Furthermore, the presence of TiO 2 -KH550-PA can also strengthen the oxidation resistance , charring ability and char layer stability of the coating, when the remaining mass of IFRCC 2 increases to 49.0 % at 800 °C. The anti-ageing performance test demonstrates that the TiO 2 -KH550-PA can absorb ultraviolet light , eliminate free radicals, and raise the structural stability of the coating, thus reinforcing the durability of the fire resistance for the coating.
研究领域:
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
CONSTRUCTION AND BUILDING MATERIALS
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2020
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IF 4.419
Zhenhai Xu,Jianming Gao,Zonghui Zhou,Yasong Zhao,Xuemei Chen
In order to clarify the enhancing mechanism of nano-TiO 2 (NT) on tricalcium silicate (C 3 S) paste, the hydration and microstructure of C 3 S with and without NT were investigated. Hydration properties were analyzed by setting time, compressive strength , hydration heat, Ca(OH) 2 content and relative content of C-S-H. Moreover, the microstructure of C 3 S paste was studied by pore structure and micromorphology. The results showed that seeding effect of NT promoted the chemical activity as well as hydration of C 3 S and more NT led to higher hydration degree. Besides, NT can increase the content of Ca(OH) 2 and the relative content of C-S-H, which also proved the enhancement effect of NT on C 3 S chemical activity and hydration. Furthermore, the seeding effect and filling effect of NT decreased total porosity, enhanced density and meliorated the microstructure of hardened C 3 S paste. Ultimately, the improved hydration and optimized microstructure introduced by NT enhanced the compressive strength of C 3 S paste.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Jianhua Sha,Yunkai Sun,Haiyan Yu,Zitong Yang,Hongwei Chu,Yan Wang,Qinyan Yue,Weiyan Yin,Shiping Xu
To overcome the recovery challenge of nanoscale photocatalysts, great endeavor has been paid to explore effective nano-TiO 2 immobilization approaches, but comprehensive comparison between these methods is still lacking. Herein, four approaches, namely impregnation-calcination, sol-gel, solvothermal route and click chemistry strategy were fully compared to immobilize nano-TiO 2 onto biochar from the viewpoint of properties characterization, photocatalytic activity, structure stability and pollutant degradation pathway. It was found that, compared to other three methods, product obtained by click chemistry (CC-P25/BC) showed superior adsorption-photocatalysis synergy and persistent long-term stability. These superiorities were not attributed to pore structure, crystallinity or light absorption , but predominated by the robust chemical bonds between TiO 2 and biochar, which served as an effective internal channel for electrons transportation. Besides, with CC-P25/BC as photocatalyst, a unique self-acceleration period was observed during methylene orange (MO) degradation. Via investigating MO degradation pathway and solution environment, we found that it was the strong photocatalytic activity of CC-P25/BC that selectively accelerated MO demethylation, thus leading to solution pH drop and subsequent MO adsorption enhancement and then degradation acceleration. Thus, this study confirmed the superiority of click chemistry in nanoscale photocatalyst immobilization, and affirmed the importance of pollutant degradation process in governing its degradation rate.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）