Polyurethane membrane with a cyclodextrin-modified carbon nanotube for pervaporation of phenol/water mixture

2017 ◽  
Vol 37 (5) ◽  
pp. 449-459 ◽  
Author(s):  
Hong Ye ◽  
Yu Wang ◽  
Xiang Zhang ◽  
Zhongguo Zhang ◽  
Boyu Song
Keyword(s):  
Carbon Nanotubes ◽  
Water Mixture ◽  
Phenol Content ◽  
Chemical Methods ◽  
Chemically Modified ◽  
Comprehensive Performance ◽  
Phenol Water ◽  
Physical And Chemical ◽  
Pervaporation Separation ◽  
Polyurethane Membrane

Abstract Polyurethane (PU) membrane has great potential in pervaporation recovery of phenol from water. In order to improve the permeability of the membrane, cyclodextrin was attached onto carboxylic and hydroxylate carbon nanotubes (CNTs) by physical and chemical methods, with which modified CNTs/PU membranes were prepared. The results showed that the addition of modified CNTs greatly increases the permeability and comprehensive performance of PU membranes in the pervaporation separation of a phenol/water mixture. With 0.5% phenol content in feed at 80°C, the flux and pervaporation separation index of blank PU are 6.10 and 324 kg·μm·m−2·h−1, while those of chemically modified carboxylic CNTs/PU membranes are 156.1 and 655.8 kg·μm·m−2·h−1, respectively.

Application of polyurethane membrane with surface modified ZSM-5 for pervaporation of phenol/water mixture

2017 ◽  
Vol 37 (8) ◽  
pp. 777-784 ◽  
Author(s):  
Hong Ye ◽  
Xiang Zhang ◽  
Zhongguo Zhang ◽  
Boyu Song ◽  
Weiwei Song
Keyword(s):  
Mixed Matrix Membranes ◽  
Trimethylammonium Chloride ◽  
Water Mixture ◽  
Before And After ◽  
Ft Ir ◽  
Phenol Water ◽  
Surface Modified ◽  
Feed Temperature ◽  
Pervaporation Separation ◽  
Polyurethane Membrane

Abstract In the present work, β-cyclodextrin was grafted to the surface of ZSM-5 via 2,3-epoxypropyl trimethylammonium chloride (ETMAC) and epichlorohydrin (EPI) as the bridging agent by ion exchange and sequential grafting. The mixed matrix membranes were prepared using polyurethane (PU) and ZSM-5 before and after modification. Modified ZSM-5 and corresponding MMM were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and scanning electron microscope (SEM). These membranes were applied for the removal of phenol from aqueous solution in pervaporation process. The results showed that modified ZSM-5 dispersed homogeneously in polymer. The flux and pervaporation separation index of PU increased greatly with a limited decrease in selectivity by the addition of modified ZSM-5. The increased feed temperature enhanced both the flux and separation factor of PU and modified PU membranes.

The dispersion, solubilization and stabilization in “solution” of single-walled carbon nanotubes

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 68760-68787 ◽  
Author(s):  
Boris I. Kharisov ◽  
Oxana V. Kharissova ◽  
Alejandro Vázquez Dimas
Keyword(s):  
Carbon Nanotubes ◽  
Organic Solvents ◽  
Single Walled Carbon Nanotubes ◽  
Chemical Methods ◽  
Single Walled Carbon ◽  
Physical And Chemical ◽  
Walled Carbon Nanotubes

Methods for the solubilization and dispersion of single-walled carbon nanotubes in water and organic solvents by physical and chemical methods have been reviewed.

Modification of Collagen for Biomedical Applications: A Review of Physical and Chemical Methods

2016 ◽  
Vol 20 (17) ◽  
pp. 1797-1812 ◽  
Author(s):  
Xiaoyue Yu ◽  
Cuie Tang ◽  
Shanbai Xiong ◽  
Qijuan Yuan ◽  
Zhipeng Gu ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Chemical Methods ◽  
Physical And Chemical

Biomedical Applications and Patents on Metallic Nanoparticles

2020 ◽  
Vol 10 ◽  
Author(s):  
Geetanjali Singh ◽  
Pramod Kumar Sharma ◽  
Rishabha Malviya
Keyword(s):  
Metallic Nanoparticles ◽  
Biomedical Applications ◽  
Size Range ◽  
Biomedical Application ◽  
Chemical Reduction ◽  
Chemical Methods ◽  
Future Challenges ◽  
Biological Methods ◽  
Cancer Diagnosis And Therapy ◽  
Physical And Chemical

Aim/Objective: The author writes the manuscript by reviewing the literatures related to the biomedical application of metallic nanoparticles. The term metal nanoparticles are used to describe the nanosized metals with the dimension within the size range of 1-100 nm. Methods: The preparation of metallic nanoparticles and their application is an influential area for research. Among various physical and chemical methods (viz. chemical reduction, thermal decomposition, etc.) for synthesizing silver nanoparticles, biological methods have been suggested as possible eco-friendly alternatives. The synthesis of metallic nanoparticles is having many problems inclusive of solvent toxicity, the formation of hazardous byproducts and consumption of energy. So it is important to design eco-friendly benign procedures for the synthesis of metallic nanoparticles. Results: From the literature survey, we concluded that metallic nanoparticles have applications in the treatment of different diseases. Metallic nanoparticles are having a great advantage in the detection of cancer, diagnosis, and therapy. And it can also have properties such as antifungal, antibacterial, anti-inflammatory, antiviral and anti-angiogenic. Conclusion: In this review, recent upcoming advancement of biomedical application of nanotechnology and their future challenges has been discussed.

scholarly journals Decreasing Oxalate Levels in Kimpul Tubers (Xanthosoma sagittifolium) by Physical and Chemical Methods

2021 ◽  
Vol 667 (1) ◽  
pp. 012015
Author(s):  
I Sulaiman ◽  
C Annisa ◽  
Y M Lubis ◽  
Z F Rozali ◽  
S Noviasari ◽  
...  
Keyword(s):  
Chemical Methods ◽  
Xanthosoma Sagittifolium ◽  
Physical And Chemical

COMPARAISON DE DIVERSES METHODES DE CASTRATION ET DE STERILISATION DES AGNEAUX: I. INFLUENCE DE CES METHODES SUR LA CROISSANCE, L’EFFICIENCE ALIMENTAIRE, LE RENDEMENT A L’AHATTAGE ET LA RENTABILITE

1971 ◽  
Vol 51 (3) ◽  
pp. 579-589 ◽  
Author(s):  
J. M. BAILLARGEON ◽  
J. P. LEMAY ◽  
W. B. HOLTMANN ◽  
L. A. CHARETTE
Keyword(s):  
Feed Efficiency ◽  
Intramuscular Injection ◽  
Cadmium Chloride ◽  
Complete Removal ◽  
Chemical Methods ◽  
Treatment Groups ◽  
Dressing Percentage ◽  
Breeding Groups ◽  
Physical And Chemical ◽  
Daily Gain

An experiment was conducted to compare various physical and chemical methods of castration of lambs at 15 and 60 days of age. Their effects on body growth, feed efficiency, dressing percentage and profitability were studied. At birth 100 lambs were divided among the 16 different treatments according to sex and the following breeding groups: Suffolk, North Country Cheviot, two-breed cross and three-breed cross. The different methods of castration were: complete removal of the testicles, Burdizzo, elastrator and partial castration. The sterilization methods consisted of intramuscular, intratesticular and intraveinous injection of cadmium chloride. All lambs were weaned at 30 days of age and placed in individual pens. They were subjected to similar environmental conditions and shipped to slaughter at approximately 45 kg body weight. Significant differences were observed among breeds, sexes and the various castration methods for daily gain, feed efficiency, days required to reach market and profitability. Age at castration did not have any important effect ort the variables measured. Superior gains, feed efficiency and profitability were observed for the partially castrated group, for the lambs that received an intramuscular injection of cadmium chloride and for the non-castrated males. All treatment groups involving males were superior to the females for the characters studied except for dressing percentage.

scholarly journals Low-Energy Irradiation Damage in Single-Walled Carbon Nanotubes

2007 ◽  
Vol 994 ◽  
Author(s):  
Satoru Suzuki ◽  
Yoshihiro Kobayashi
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Properties ◽  
Single Walled Carbon Nanotubes ◽  
Low Energy ◽  
Irradiation Damage ◽  
Single Walled Carbon ◽  
Photon Irradiation ◽  
Energy Irradiation ◽  
Physical And Chemical ◽  
Walled Carbon Nanotubes

AbstractWe show that low-energy (20 eV–20 keV) electron or photon irradiation extinguishes the characteristic physical and chemical properties of single-walled carbon nanotubes, indicating that the irradiation damages the nanotubes. The irradiation-induced defects convert the electric properties of metallic SWNTs to semiconducting, and the nominal bandgap can be tuned simply by the irradiation dose. The defects also have the following interesting properties. The damage and recovery are reversible, indicating that the number of carbon atoms is preserved. The damage and recovery strongly depend on the diameter, suggesting that the damage is prominent in a rolled up graphene sheet, but not in a planar one. The activation energy of the defect healing is so small, depending on the diameter, that the defects can be healed even at room temperature or below.

scholarly journals Carbon: 25th Anniversary Article: Chemically Modified/Doped Carbon Nanotubes & Graphene for Optimized Nanostructures & Nanodevices (Adv. Mater. 1/2014)

2014 ◽  
Vol 26 (1) ◽  
pp. 2-2 ◽  
Author(s):  
Uday Narayan Maiti ◽  
Won Jun Lee ◽  
Ju Min Lee ◽  
Youngtak Oh ◽  
Ju Young Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
25Th Anniversary ◽  
Chemically Modified

Chemically Modified Carbon Nanotubes for Use in Electroanalysis

2005 ◽  
Vol 152 (3-4) ◽  
pp. 187-214 ◽  
Author(s):  
Gregory G. Wildgoose ◽  
Craig E. Banks ◽  
Henry C. Leventis ◽  
Richard G. Compton
Keyword(s):  
Carbon Nanotubes ◽  
Chemically Modified ◽  
Modified Carbon Nanotubes

SUBSTANTIATION OF THE TECHNOLOGICAL SCHEME FOR PRODUCING LIQUID SUGAR FROM SEMI-PRODUCTS OF BEET SUGAR PRODUCTION

2019 ◽  
Author(s):  
Р.С. Решетова ◽  
О.Ю. Бганцева
Keyword(s):  
Food Production ◽  
Technological Scheme ◽  
Preliminary Treatment ◽  
Sugar Solution ◽  
Sugar Production ◽  
Chemical Methods ◽  
Storage Duration ◽  
Number Of Microorganisms ◽  
Permissible Levels ◽  
Physical And Chemical

Разработана технологическая схема получения жидкого сахара из полупродуктов свеклосахарного производства, которая предусматривает получение исходного (концентрированного) сахарного раствора из сиропа после выпарки, некондиционного сахара и желтого сахара последнего продукта с содержанием сухих веществ (СВ) от 68 до 72. Изучено изменение количества микроорганизмов в жидком сахаре в течение 30 сут хранения в закрытых сосудах при температуре окружающей среды без предварительной обработки физическим и химическим способами с целью использования сиропа при производстве пищевых продуктов. Установлено, что в растворе с содержанием СВ 68 72 количество микроорганизмов увеличилось: бактерий с 15 до 60 КОЕ/г, дрожжей и плесневых грибов с 10 до 34 КОЕ/г, что не превышает допустимых уровней СанПиН 2.3.2.1078 01 и ГОСТ Р 53035 2008. Определена длительность хранения жидкого сахара для использования в пищевых производствах не более 15 сут. The technological scheme of obtaining liquid sugar from semiproducts of sugar beet production, which provides for obtaining the initial (concentrated) sugar solution from the syrup after evaporation, substandard sugar and yellow sugar of the last product with a content of dry matters from 68 to 72, has been developed. The change in the number of microorganisms in liquid sugar was studied during 30 days of storage in closed vessels at ambient temperature without preliminary treatment by physical and chemical methods with the aim of using syrup in food production. It was found that in the solution with the content of dry matters 68 72 the number of microorganisms increased: bacteria from 15 to 60 CFU/g, yeast and fungi from 10 to 34 CFU/g, which does not exceed the permissible levels of SanPiN 2.3.2.1078 01 and GOST R 53035 2008. The storage duration of liquid sugar for use in food production was determined no more than 15 days.

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