Nuclear Science and Techniques
·
2018
·Vol. 29
·期 7
·1-8
·
IF 1.085
Bian Zhong-Xuan,Miao Xia-Ran,Lin Jin-You,Tian Feng,Bian Feng-Gang,Li Hui
Cellulose nanofibrils (CNFs) are a type of natural nanomaterials extracted from plants and animals that have expanding applications in numerous areas benefiting from their inherent properties of renewability, biodegradability, and sustainability. For energy consumption reduction, CNFs were extracted from raw jute fibers, which were not pretreated in a hot alkali or acid solution, by TEMPO-mediated oxidation. Synchrotron radiation wide-angle scattering was performed to realize the crystallization of the CNF crystallites; Fourier transform infrared spectroscopy, transmission electron microscopy, and field-emission scanning electron microscopy were used to characterize the changes in chemical groups and visualized morphology of CNFs. The simplified preparation and shortened cycle should further help the study of the structure–function relationship of jute CNFs subjected to chemical modification.
研究领域:
材料科学
·
植物学
·
化学工程
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产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Shaoyang Liu,Jie Qi,Yuzhe Li,Ruiyao Wang,Li Wang,Hongsheng Lu,Zheng Zhang
The reversible shift in polarity or hydrophilicity/hydrophobicity of switchable solvents greatly simplifies the recovery capacity in extraction applications. However, the environmental and economical advantages of switchable solvents are not significant. In this work, we designed three pH-responsive natural deep eutectic solvents (NADESs) by combining the pH-switchable solvent fatty acids with the nonswitchable solvent ethyl lactate (EL), followed by the exploration of the solubilization and separation performance of these NADESs for petroleum hydrocarbons. EL can be miscible in fatty acids and water; however, when in contact with both at the same time, EL binds to fatty acids through stronger intermolecular hydrogen bonds, whereas when fatty acids are deprotonated to fatty acid salts, EL can bind to water. The deprotonation/protonation of fatty acids could reversibly change the NADES hydrophilicity, and the recovery of NADES HA/EL could exceed 95% after three cycles. Furthermore, after extractive separation of simulated oils of differing complexity, NADES HA/EL was selected as the best extractant. Compared with the extraction of oil sands with a single solvent, NADES provides better wetting of the sand surface, better stripping efficiency of the heavy components that adhere to the surface of oil sands, and better dispersion of the stripped petroleum hydrocarbons. Petroleum hydrocarbons can be separated by NaOH-induced hydrophilic changes in NADES, which can be regenerated upon the addition of HCl. The recovered NADES showed good reusability in the cleaning of oil sands. The oil removal rates were 96.9%, 94.4%, and 91.9% after three cycles of cleaning with NADES at 25 °C. This method is expected to expand the application of nonswitchable solvents in sustainable extraction.
研究领域:
环境科学
·
化学工程
·
能源技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xuewu Zhu,Heng Liang,Xiaobin Tang,Langming Bai,Xinyu Zhang,Zhendong Gan,Xiaoxiang Cheng,Xinsheng Luo,Daliang Xu,Guibai Li
A high-performance nanofiltration (NF) membrane with simultaneously improved desalination and antifouling properties while maintaining regeneration ability is highly desirable in water treatment. Surface modification is an effective approach to enhance the performance of NF membranes. In the present study, a multifunctional thin-film composite NF membrane (Fe–TFC) was fabricated via coating a regenerable ferric ion–tannic acid (FeIII–TA) layer on the nascent polyamide membrane surface. The Fe–TFC membrane exhibited enhanced hydrophilicity, smaller pore size, and lower negative charge compared with the control membrane. The salt rejections and selectivity of divalent to monovalent ions were greatly improved with only a slight decrease in water permeability due to the presence of the coating layer. Meanwhile, dynamic fouling tests with humic acid demonstrated that the Fe–TFC membrane possessed an enhanced antifouling property and excellent flux recovery rate. After coating, the normalized water flux and flux recovery of the Fe–TFC membrane increased from 0.02 to 0.26 and 32.1 to 76.4% at the end of five cycles of fouling tests, respectively. In addition, the resultant membrane exhibited excellent durability and stability under harsh conditions for ∼10 days. Interestingly, the fouled coating layer can be easily removed by HCl cleaning and regenerated through an in situ strategy. Consequently, the regenerated membranes presented stable antifouling properties and desalination performance after several times of regeneration. It was demonstrated that the unique feature of FeIII–TA networks enables the coating layer to act as a protective layer for the underlying polyamide membrane, leading to the high performance of the composite membrane. This study provides a new insight for surface functionalization and easy regeneration of the TFC nanofiltration membrane in water treatment technology.
研究领域:
材料科学
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环境工程
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
PROCESS BIOCHEMISTRY
·
2019
·
IF 2.883
Xiaohui Di,Yu Zhang,Junying Fu,Qiang Yu,Zhongming Wang,Zhenhong Yuan
High value-added utilization of biomass-based platform chemicals has attracted increasing attention in recent years. The present study addresses the upgrading of levulinic acid (LA), an important biomass-based platform chemical, to methyl levulinate via a green and efficient enzymatic approach. Various lipases were assessed, with Novozym ® 435 displaying the best results for the esterification of LA. Subsequently, the effect of reaction medium on Novozym ® 435 catalyzed esterification was also studied. Compared with other reaction media, 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) showed the greatest enhancement in yield by suppressing hydrolysis activity. The catalysts reusability was also improved by protection from [bmim][PF 6 ] with 43.2% activity remained after 5 cycles, compared to that of 19.1% in 2-Me THF. Reaction temperature exerted an unusual double-peak relationship over methyl levulinate yield because Novozym ® 435 can simultaneously catalyze the esterification of LA and hydrolysis of methyl levulinate, each of which has a different optimal reaction temperature: ca. 30 °C and ca. 40 °C, respectively. When the molar ratio of LA/methanol, and the volume ratio of methanol/[bmim][PF 6 ] were 1:5 and 1:3, respectively, methyl levulinate was obtained in 93% yield at 30 °C after 24 h with 10 mg/mL catalytic loading.
研究领域:
生物化学
·
绿色化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Shaokun Wang,Xiaofei Ma,Pengwu Zheng
Cellulose/graphene oxide (CG) porous composites with 3D network structure were prepared via a solution mixing-regeneration and freeze-drying process. The CG aerogels were functionalized with 1,4-butane sultone under mild reaction conditions to achieve sulfated composite aerogels (SCGs), in which the sulfo groups were simultaneously introduced onto GO and cellulose components. The adsorption ability of SCG aerogel was greatly enhanced compared with CG aerogels. The fitting results of adsorption models suggested the monolayer adsorption and chemisorptive characteristics with the maximal uptake capacity as high as 421.9 mg/g for methylene blue (MB) and 163.4 mg/g for tetracycline (TC). The adsorption mechanism was also studied in detail. For the simulated wastewater containing MB and TC, the novel SCG adsorbent exhibited a removal efficiency of 99%. Furthermore, its adsorption capacity was not apparently deteriorated after seven cycles for MB and ten cycles for TC while the original structural integrity was almost maintained. Herein, this recyclable and reusable adsorbent exhibited the potential application on the removal of MB and TC from water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 20
·7360-7366
·
IF 2.562
Shimin Kang,Jun Ye,Yu Zhang,Jie Chang
Amorphous carbon-based sulfonated catalysts were generated from four kinds of biomass (lignin, cellulose, wood meal and D-xylose) by hydrothermal carbonization at various temperatures (225, 245 and 265 °C) followed by sulfonation, with a yield of 36–56%. All of these catalysts showed aromatic structure, hydroxyl and carboxyl groups, with a density of SO3H groups between 0.56 and 0.87 mmol g−1. 5-Hydroxymethylfurfural (HMF) was produced from inulin in ionic liquids (ILs) in one step with the addition of carbon-based sulfonated catalysts, with a factual yield of 47–65% at 100 °C, 60 min. Moderate extension of reaction time (from 30 to 90 min) and increase of temperature (from 80 to 120 °C) promoted HMF production. Ethyl acetate was used as extractant, and about 39–55% of HMF can be recovered from ILs. One problem with these carbon-based sulfonated catalysts was that they would be partly deactivated in ILs for separate reuse, however, they can be easily regenerated by dilute sulfuric acid treatment. The carbon-based sulfonated catalysts exhibited good catalytic activity compared with traditional solid acid catalysts, and the carbon-based sulfonated catalyst/ILs reaction system showed high reusability. In consideration of the renewable as well as the high catalytic activity abilities, these biomass derived carbon-based sulfonated catalysts would be promising for industrial application.
研究领域:
生物化学
·
催化化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Xue Zhang,Shiyi Wang,Xingyi Zhu,Donghai Zhu,Wei Wang,Bin Wang,Shubo Deng,Gang Yu
Covalent organic frameworks (COFs) demonstrate remarkable potential for adsorbing per/polyfluoroalkyl substances (PFAS). Nevertheless, the challenge of recycling powdered COFs hampers their practical application in water treatment. In this research, a quaternary amine COF with inherent positive surface charge was synthesised to adsorb perfluorooctanoic acid (PFOA) via electrostatic interactions. The COF was then combined with chitosan (CS) through a simple dissolution-evaporation process, resulting in a composite gel material termed COF@CS. The findings indicated that the adsorption capacity of COF@CS significantly surpassed that of the original COF and CS. According to the Langmuir model, COF@CS achieved a maximum PFOA capacity of 2.8 mmol g −1 at pH 5. Furthermore, the adsorption rate increased significantly to 6.2 mmol g −1 h −1 , compared to 5.9 mmol g −1 h −1 for COF and 3.4 mmol g −1 h −1 for CS. Notably, COF@CS exhibited excellent removal efficacy for ten other types of PFAS. Moreover, COF@CS could be successfully regenerated using a mixture of 70% ethanol and 1 wt% NaCl, and it exhibited stable reusability for up to five cycles. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) characterisation, and theoretical calculations revealed that the quaternary amine functional group in COF served as the primary adsorption site in the composite gel material, while the protonated amino group on CS enhanced PFOA adsorption through electrostatic interaction. This study highlights the significant practical potential of COF@CS in the removal of PFAS from aqueous solution and environmental remediation.
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
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 16
·11024-11036
·
IF 3.442
Yang Lu,Wang Yanhua,Liu Aihua,Zhang Yang
A novel biomass carbon doped with dual-metal oxide mischcrystal (cobalt oxide and molybdenum oxide) was synthesized by using Enteromorpha (EP) of marine algae as carbon source. Multi-wrinkles biomass carbon (MWBC) with magnetic properties was obtained and formed highly dispersed CoO x /MoO y nanoparticles onto the surface of MWBC in situ via a simple impregnation and direct carbonization at 700 °C. The framework of CoO x /MoO y @MWBC was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The as-prepared CoO x /MoO y @MWBC was applied as efficient adsorbents for selective removal methyl blue (MB) at pH 10 from water medium. For comparison, single metal-derived porous carbon, i.e., CoO x @MWBC and MoO y @MWBC, was also synthesized, characterized and tested for MB adsorption. The results exhibited that CoO x /MoO y @MWBC has the highest MB adsorption capacity (1587.3 mg g −1 ) and excellent selectivity. In addition, it could be easily separated from water by an external magnetic field without any organic reagent added. Adsorption equilibrium data were described by Langmuir and Freundlich isotherms, and kinetic data were described by pseudo-first-order, pseudo-second-order and intraparticle diffusion model. Moreover, CoO x /MoO y @MWBC also owned outstanding stability and renewability, which can be regenerated by an easy-going method of ethanol washing and reused at least 10 times without a significant loss in removal percentage.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 36
·17002-17008
·
IF 3.591
Nan Nan Xia,Bingbing Zhang,Zi Hao Hu,Fangong Kong,Guomin Xu,Fei He
It is desirable to develop a sustainable Hg ion scavenger, which features a high adsorption capacity, fast adsorption kinetics, as well as robust stability and excellent recyclability, but it remains a challenge. Herein, we constructed a bio-based Hg2+ nano-scavenger via the electrostatic interaction and hydrogen bonding driven supramolecular self-assembly of natural lignosulfonate (LS), chitosan (CTS) and tannin (TA). The intermolecular interaction enabled the formation of a supramolecular nano-network with a high surface area and abundant macro/meso-porosities, which greatly promoted the exposure of adsorption sites and the fast transport of Hg2+ from the solution environment to these adsorption sites. Consequently, LS–CTS–TA achieved a maximum adsorption capacity of 95.24 mg g−1 and followed the Langmuir isotherm model with a characteristic pseudo-second-order kinetics during removal of high concentration Hg. Furthermore, such a robust and heterogeneous nano-network structure of LS–CTS–TA exhibited a high removal efficiency for low concentration mercury and good regeneration ability.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 7
·1-12
·
IF 2.278
Zhao Lianhong,Yan Xiufang,Jie Zhiqiang,Yang Hong,Yang Shiping,Liang Jie
Regenerable antimicrobial N -halamine/silica hybrid nanoparticles (NPs) containing chlorinated 5,5-dimethylhydantoinyl (Cl-DMH) groups, Cl-DMH/SiO 2 hybrid NPs, have been prepared by a co-condensation reaction between N -(3-triethoxysilylpropyl)-5,5-dimethylhydantoin (TS-DMH) and tetraethoxysilane (TEOS) and then a chlorination reaction in NaClO solution. The as-synthesized Cl-DMH/SiO 2 NPs were characterized by transmission electron microscopy, Scanning electron microscopy, X-ray photoelectron spectra, Specific surface area, Differential scanning calorimetry, and Fourier transform infrared. Experimental results showed that the size of the as-synthesized Cl-DMH/SiO 2 NPs could be well adjusted by changing the mass ratio of TS-DMH/TEOS and the volume ratio of 28 % NH 4 OH/H 2 O. Antimicrobial tests showed that the as-prepared Cl-DMH/SiO 2 hybrid NPs had excellent antimicrobial activities against both Escherichia coli and Staphylococcus aureus . The minimum inhibitory concentration and minimum bactericidal concentration values of the as-prepared Cl-DMH/SiO 2 hybrid NPs are 15 and 20 μg/mL for S. aureus , 25 and 30 μg/mL for E. coli , respectively. Paper disk diffusion assay showed that smaller-sized Cl-DMH/SiO 2 hybrid NPs have bigger inhibition zone diameters, indicating stronger antimicrobial efficacies. Also, the storage stability and regenerability of Cl-DMH/SiO 2 hybrid NPs were investigated.
研究领域:
材料科学
·
微生物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 6
·1823-1832
·
IF 2.573
Zixin Liu,Huan Liu,Yan Wang,Haoran Yu,Jianying Wang
Hypercrosslinked polymers (HCPs) have aroused considerable attention due to their high chemical stability and potential applications in adsorption. A series of HCPs were prepared via one-step solvent knitting method using the cashew nut shell liquid (CNSL) as bio-based building block. Characterization of the prepared samples was performed by N 2 adsorption, Fourier transform infrared, Raman spectra, solid-state 13 C NMR spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy, and transmission electron microscopy images. Depending on the N 2 adsorption, the as-prepared CNSL-HCP4 exhibits the highest specific surface area of 93 m 2 ·g −1 and displays a uniform pore-size distribution. TGA results show that the decomposition temperature of the polymers exceeds 350°C. More significantly, the dynamic adsorption of high concentration of volatile organic compounds (VOCs) was investigated with CNSL-HCP4 under dry and humid conditions. The results show that the maximum adsorption capacity of o -xylene under dry conditions is 217 mg·g −1 and its corresponding adsorption amount (208 mg·g −1 ) decreases slightly under 30% relative humidity condition, indicating that CNSL-HCP4 had a hydrophobic surface. A little decrease in adsorption capacity of o -xylene on CNSL-HCP4 after five recycles confirms the reusability of the CNSL-HCPs. Therefore, CNSL-HCP4 is considered to be a promising candidate for potential adsorbent in recycling the VOCs from the exhaust.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Junjie Yuan,Yao Zhu,Jizhang Wang,Zhigang Liu,Tao Zhang,Pingping Li,Fengxian Qiu
The promotion of the utilization of waste agricultural and forestry resources (AFRs) as a means of combating environmental pollution represents an advanced and necessary development approach with the potential to achieve sustainable development. In this work, an advanced adsorbent with a functional Mg–Al bimetallic layer was prepared using waste sawdust biomass (WSD) as a raw material. The layer serves as the primary active component for adsorbing total phosphate from both simulated and real wastewater. The hierarchical structure of the Mg–Al bimetallic hydroxide-modified waste sawdust biomass (MA@WSD) has an abundance of nanosheets on its surface, providing ample binding sites and an enhanced specific surface area of 175.99 m2/g. Under the optimal conditions, the maximum removal efficiency toward phosphate can reach 99.99%. The adsorption of phosphate by MA@WSD follows the pseudo-second order kinetic (PSOK) model, indicating that chemisorption is the rate-determining step. Moreover, the thermodynamic data demonstrate the spontaneous nature of the adsorption process, indicating the favorable characteristics of the developed material. The adsorption mechanism can be summarized as the collaboration of physical adsorption, electrostatic interaction, and chemical adsorption. The results of the regeneration process indicate that MA@WSD exhibits a retention of 50.3% of its initial adsorption performance following the fifth testing cycle, thereby suggesting its potential for comparable reusability. The MA@WSD performs well in adsorbing total phosphate in real river water, and the removal efficiency of MA@WSD is evidently superior to commercial activated carbon, which is at least 70% higher than that of the commercial activated carbon. Besides, the 5-time average removal efficiency toward total phosphate by MA@WSD is 62.9%, evidently higher than the 29.1% of commercially available activated carbon, indicating its potential as an alternative for treating phosphorus-containing wastewater. The research provides theoretical support for harmless treatment, resource utilization, carbon sequestration, and emission reduction of waste biomass.
研究领域:
环境科学
·
材料科学
·
生物资源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）