BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-14
·
IF 4.6
Wei Jia,Yan Luchun,Zhang Zhifang,Hu Bing,Gui Wenjun,Cui Yanjun
Acid red 73 is an azo dye, and its residue can pollute the environment and seriously threaten human health and life. In this study, glutaraldehyde was used as the crosslinking agent, chitosan and polyvinyl alcohol were crosslinked under appropriate conditions to obtain a chitosan hydrogel film, and carbon nanotubes were dispersed in the chitosan hydrogel film. The FTIR, XRD, BET, SEM were applied to chatacterize the structure and the morphology of the absorbent and results showed that when the mass fraction of the carbon nanotubes was 1%, the structure was a three-dimensional network with microporous, and the water absorption reached to the maximum value of 266.07% and the elongation at break reached to a maximum of 98.87%. The ability to remove acid red 73 from aqueous and soil environments was evaluated by UV. In the aqueous samples, 70 mg of the adsorbent reached a saturated adsorption capacity of 101.07 mg/g and a removal rate of 92.23% at pH = 5. The thermodynamics conformed with the Langmuir adsorption isotherm and pseudo second-order adsorption kinetic models. In the soil samples, 100 mg of the adsorbent reached an adsorption capacity of 24.73 mg/g and removal rate of 49.45%. When the pH of the soil is between 4 and 7, the removal rate and adsorption capacity do not change much; hence, the pH should be maintained between 5.2 and 6.8, which is extremely suitable for the growth of general plants. Moreover, the experimental results demonstrated that the adsorbent maintained a good removal rate of acid red 73 over six adsorption cycles. Graphical
研究领域:
环境科学
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材料科学
·
化学工程
·
水处理
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土壤修复
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高分子科学
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分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2024
·Vol. 39
·期 9
·1449-1461
·
IF 2.7
Zhang Yeheng,Lin Wensong,Gao Ran,Lin Huanxia,He Yong
One-step co-precipitation method was used to prepare the flower-like BiOCl/BiOBr composite materials (BOBCs) with heterojunction structures, in which various amounts of BiOBr were used to adjust the band gap of BiOCl and thereby improve its photocatalytic activity. Based on photocatalytic performance experiments, BOBC2, in which the molar ratio of BiOCl to BiOBr is 1:0.75, exhibited the highest photodegradation efficiency (90.5%) to remove ofloxacin after 100 min illumination. The cyclic utilization performance of BOBC2 under the same conditions was tested by a cycle experiment. It was found that its photocatalytic activity remained at a high level after three cycles. The composition and microstructure of the material were analyzed by characterization techniques including XRD, FTIR, XPS, and SEM. The optical properties and the degradation process of the material were studied by DRS, PL, photocurrent, and active species trapping methods. The reasonable mechanism for photocatalytic degradation of ofloxacin was proposed. Graphical abstract
研究领域:
材料科学
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环境科学
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化学工程
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纳米技术
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光催化
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2021
·
IF 2.168
Yanyang Gao,Wanqiu Liu,Liuyan Tang,Yanan Zhu,Jinqing Qu
As the laws about emission of volatile organic compounds (VOCs) become more and more stringent, low VOC content coatings, such as high solid polyurethane coating, gradually attract great attention. Herein, a series of star-shaped hydroxyl polyesters (SHPs) were synthesized by methyl hexahydrophthalic anhydride (MHHPA), diisopropanolamine (DIPA), and monoglycidyl ether. The number of their average molecular weights is ranged from 913 to 1390 with 1.55–1.75 of PDI. The viscosities of SHPs are low to 1060 mPa·s. The molecular structures of SHPs were characterized by Fourier transform infrared (FTIR) and 1H nuclear magnetic resonance (1H NMR) spectroscopies. The high-solid two-component polyurethane coatings (2 K-PU) from SHP-3 have a 65% of the solid contents and exhibit 20 mPa·s of the applied viscosity with 310 g/L of VOC contents. Moreover, the polyurethane film displays high coating hardness up to 2H, as well as excellent chemical resistance and good thermal stability.
研究领域:
高分子科学
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材料工程
·
涂料技术
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环境化学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 81
·期 6
·1114-1129
·
IF 1.638
Wang Jun,Xie Qinglong,Li Ao,Liu Xuejun,Yu Fengwen,Ji Jianbing
In this study, an efficient route to synthesizing polyethyleneimine-modified ultrasonic-assisted acid hydrochar (PEI-USAH) is developed and reported. Ultrasonic irradiation technique was used as surface modification method to shorten the crosslinking reaction for hydrochar and polyethyleneimine (PEI). The PEI-USAH showed an excellent adsorption capacity for Cr(VI) from aqueous solution. The physicochemical properties of this PEI-modified adsorbent were comparatively characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller analysis and CNHS analysis. The effects of contact time, initial pH, and biosorbent dose on adsorption capacities were investigated. The batch adsorption experiments showed that PEI-USAH possessed the maximum adsorption capacities of 94.38 mg/g and 330.84 mg/g for initial Cr(VI) concentration of 100 mg/L and 500 mg/L, respectively. Furthermore, this adsorption process could be fitted to Langmuir adsorption and described by the pseudo second order kinetic model. Based on the above findings, PEI-USAH could be used as a potential adsorbent for removal of Cr(VI) from wastewater.
研究领域:
环境科学
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化学工程
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材料科学
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分析化学
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水处理技术
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 6
·569-576
·
IF 2.4
Ma Mingfang,Wang Tongyu,Liu Renrui,Jiang Wenwen,Niu Zhaocan,Bai Mingjuan,Wu Weiwei,Hao Aiyou,Shang Wenqing
Even though amino acid derivatives are always used as the building blocks to construct gels in supramolecular chemistry, there is still no report about N -alpha-Fmoc- L -valine (Fmoc-V) hydrogel induced by metal ions. Herein, a novel green Fmoc-V hydrogel with stimuli responsiveness was reported. A total of eight metal ions are applied to fabricate gels, but only Zn 2+ and Cu 2+ can induce Fmoc-V hydrogel formation. The formation of Fmoc-V hydrogel is verified by rheometer detection. FT-IR, UV–vis, and SAXS detections are used to study the formation mechanism of Fmoc-V hydrogel, implying hydrogen bond, metal–ligand, and π-π stacking interactions are the driving forces to gel formation. Moreover, this novel green hydrogel with high electrical conductivity performs multiple stimulus responsiveness to temperature, metal ion, and acid, illustrating its great potential applications in various areas.
研究领域:
超分子化学
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材料科学
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纳米技术
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高分子科学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 2
·1-16
·
IF 2.6
Guo Liyun,Zhang Haichang,Hua Jing,Liu Jinhui
Cis-1,4 - polyisoprene latex (IRL) is the best alternative to natural rubber latex (NRL) because it is free from proteins and can avoid allergic reactions in the human body. Poor mechanical properties of IRL film are a major obstacle to replacing NRL. To address this issue, a novel strategy was developed by a simple one-pot method to prepare a composite latex introducing hexadecyltrimethylammonium bromide (CTAB) modified sodium montmorillonite (org-Mnt) into the IRL preparation process. The microstructures and morphology of the resulting org-Mnt were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and Energy Dispersive Spectrometer (EDS). In addition, the dispersion state of the org-Mnt in the composite latex and the morphology of the composite films were determined by transmission electron microscopy (TEM) and SEM. The properties of the composite latex were investigated. Crosslink density, thermogravimetric analysis (TGA), mechanical properties, and thermal oxygen aging properties of the composite latex films were also studied. Finally, the mechanism of org-Mnt reinforcement of IRL was described comprehensively. The results showed that the org-Mnt/IRL (1phr and 2phr) composite latexes had a stable state, excellent film-formation performance, and excellent mechanical properties. Compared with pure IRL films, the tensile strength of org-Mnt/IRL (2phr) composite films increased by 74%, and after thermal oxygen aging, property change rates of the tensile strength and elongation at break increased by 37.2% and 32.1%, respectively, which exceeded those of NRL. The current research provides an effective method for preparing high-performance composite films suitable for high-end medical applications.
研究领域:
高分子科学
·
材料工程
·
纳米复合材料
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胶体与界面科学
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生物医用材料
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2024
·
IF 2.1
Yuan Ma,Lujie Wang,Haowen Wu,Qian Zhao,Jiying Men
Firstly, the SiO2 microspheres were prepared by Stӧber method, and then modified by 3-Aminopropyltrimethoxysilane (KH-540) to introduce –NH2 onto the microspheres. Then, SiO2-NH2 microspheres were mixed into polysulfone casting solution, and SiO2-NH2/PSF composite membrane was prepared by the phase conversion method. On this basis, the functional adsorbent SiO2-NH2/PSF-g-PMAA was prepared by grafting polymerization of methacrylic acid (MAA) as a functional monomer using –NH2/S2O82− surface initiation system. The samples were characterized by Fourier infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), the Brunauer–Emmett–Teller (BET) and weighing method. The adsorption properties of amlodipine (ADP) by functional adsorbents were investigated, and the adsorption mechanism was further studied. The results show that the adsorption reaches equilibrium at 180 min, and the adsorption kinetics can be well fitted by the pseudo-second-order model. The adsorption capacity of SiO2-NH2/PSF-g-PMAA for amlodipine in methanol with 1.4 mg/mL at 15 °C is 137 mg/g. The adsorption ability increases with the decrease of ionic strength and temperature via the hydrogen bond and ionic interactions, and the adsorption of ADP by SiO2-NH2/PSF-g-PMAA is consistent with the D-R adsorption isotherm model. Thermodynamic parameters imply that adsorption is a spontaneous and exothermic process.
研究领域:
材料科学
·
高分子化学
·
环境科学
·
化学工程
·
膜技术
·
吸附科学
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2020
·
IF 1.349
Dawei Chen,Lijun Chen
The long carbon chain monomer modified polyacrylate latex was successfully prepared by semi-continuous seeded emulsion polymerization. In this work, methyl methacrylate and butyl acrylate were used as main monomers; stearyl acrylate was used as functional monomer, which were emulsified with the novel mixed surfactants of disodium laureth sulfosuccinate (AEMES) and alkylphenol ethoxylates (OP-10) and initiated with 2,2′-azobis (2-methyl propion- amidine) dihydrochloride initiator. The structure of the resultant latex was characterized by Fourier transform infrared spectroscopy. The differential scanning calorimetry, thermogravimetric analysis and contact angle were used to test the properties of the latex film. The particle size of the latex was measured by the Zetatrac dynamic light scattering detector. Factors, which have an influence on the properties of the latex and its film, have been investigated in detail. Results show that the optimal condition of synthesizing the latex is as follows: the amount of emulsifiers is 4%; the mass ratio of AEMES to OP-10 is 3:1; the amount of initiator is 0.7%; the content of SA is 6%.
研究领域:
高分子科学
·
材料工程
·
化学合成
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2022
·
IF 1.366
Meimei Guo,Zhihua Zhou,Wenjuan Liu,Tianlong Huang,Wei Wu,Jianglong Duan,Meiling Yi,Chao Zhang,Xiao He,Jinxing Chen,Jiaming Gu,Jianjun Fang
Polymer/bioceramic composite scaffolds have gained importance in treating bone defects. In this paper we described a novel degradable scaffold material for bone tissue repairing prepared by combining poly(lactide-co-glycolide-co-ε-caprolactone) (PLLGC) and 1,4-butanediamine-modified poly(lactide-co-glycolide) (BMPLGA) with nano-biaoactive glass (NBAG) and nano β-tricalcium phosphate (β-TCP). The composite scaffolds were characterized by using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The FTIR results indicated that the inorganic fillers of NBAG and β-TCP were successfully incorporated into the PLLGC/BMPLGA matrix. The influences of the inorganic filler content and freezing temperature on the porosity and compressive strength of the composite scaffolds were studied. The composite scaffolds showed an interconnected pore structure with the pore size ranging from 20 to 100 μm depending on the freezing temperature and the inorganic fillers. The compressive strength was enhanced with increasing content of the inorganic fillers and the freezing temperature; however, the porosity decreased. We suggest the PLLGC-BMPLGA/NBAG-β-TCP composite scaffolds have great potential for application in bone tissue regeneration.
研究领域:
生物材料
·
组织工程
·
高分子科学
·
生物医学工程
·
材料表征
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 10
·1568-1580
·
IF 4.5
Sun Nan,Wu Qing,Jin Lifang,Zhu Zichen,Sun Jianhui,Dong Shuying,Xie Haijiao,Zhang Chunyan,Cui Yanrui
By using a two-step hydrothermal method and trithiocyanuric acid (TTCA), 2,4,6-trihydrazino-1,3,5-triazine (THT), and Fe 3 O 4 as raw materials, a spherical magnetic adsorbent polymer (TTCA/THT@Fe 3 O 4 ) was synthesized to achieve the efficient removal of Cr(VI) from wastewater. Under optimal adsorption conditions, the maximum adsorption capacity of TTCA/THT@Fe 3 O 4 for Cr(VI) can reach 1340 mg·g −1 . Notably, the removal efficiency can approach 98.9%, even at the lower concentration of 20 mg·L −1 Cr(VI). For actual wastewater containing Cr(VI), the Cr(VI) concentration was reduced from 25.8 to 0.4 mg·L −1 , a remarkable 20% lower than the current industry discharge standard value. A mechanism for the high adsorption performance of Cr(VI) on TTCA/THT@Fe 3 O 4 was investigated using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and density functional theory. It can be plausibly attributed to the formation of Cr/N and Cr/S coordination bonds. Additionally, surface electrostatic adsorption, reduction effects, and the spherical polymer structure increase the contact area with Cr(VI), maximizing adsorption. The synergistic effect of adsorption and reduction enhances the adsorption performance of TTCA/THT@Fe 3 O 4 for Cr(VI) and total chromium in water. The resultant polymer has a simple preparation process, excellent adsorption performance, easy magnetic separation, and promising application for actual wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOM
·
2024
·Vol. 76
·期 5
·2478-2490
·
IF 2.1
Wang Chengwang,Zhang Ruihan,Li Xingshi,Huang Yaoguo,Chen Linlin
The article presents the synthesis and application of a novel collector, 5-methyl butylxanthate-1,2,4-triazole-3-thione (MBuXTT), for chalcopyrite flotation separation from pyrite. Various interfaces and surface characterization analysis methods were employed to study the flotation separation mechanism. The micro-flotation and contact angle experiments demonstrated a significant enhancement in the surface hydrophobicity of chalcopyrite following treatment with MBuXTT. Within the pH range investigated, MBuXTT effectively enriched chalcopyrite while separating it from pyrite. Compared to the traditional collector sodium butyl xanthate, MBuXTT exhibited superior selectivity and collecting ability towards chalcopyrite. Adsorption of MBuXTT on the chalcopyrite surface was found to be an endothermic-spontaneous chemisorption process. ζ -Potential analyses and UV spectra confirmed specific adsorption of MBuXTT on chalcopyrite rather than pyrite surfaces. Additionally, FTIR, XPS, and DFT calculations were conducted to explore the adsorption mechanism on the chalcopyrite surface, and the results indicated that MBuXTT-Cu complexes can be covered on the chalcopyrite surface with formation of Cu(I)-S and Cu(I)-N bonds along with release of H + and oxidation product formation involving S–S bonds.
研究领域:
矿物加工
·
浮选化学
·
表面化学
·
吸附机理
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螯合化学
·
计算化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Huali Zhang,Jiaxin Zhang,Hanjun Wu,Yi Pan,Yan Xia,Zhiquan Pan,Dongshen Wang
In this work, heterogeneous catalysts of Cu(II)-ethylenediamine tetramethylene phosphonic acid (Cu(II)-EDTMPA) complex intercalated layered double hydroxides (EDTMPA-Cu-LDH) was synthesized by co-precipitation method for visible-light photocatalytic degradation of Rhodamine B (RhB). The synthesized catalysts were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The results indicated that the EDTMPA-Cu-LDH showed a typical layered structure. After intercalation, layer spacing increased from 7.96 to 12.21 Å. The catalysts showed excellent catalytic activity for the degradation of RhB in visible light. The optimum conditions for RhB degradation were confirmed to be natural initial pH value 5.85, 10 mmol L –1 of RhB concentration, 7 mmol L –1 of H 2 O 2 concentration, and 0.3 g L –1 of catalyst dosage. The maximum degradation efficiency was 98.2% under the optimum conditions and excellent reusability and stability were obtained in the regeneration test. In the end, the reaction mechanism that might exist in the heterogeneous UV-Fenton system was proposed.
研究领域:
环境科学
·
催化
·
材料科学
·
光催化
·
无机化学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）