Effective recovery of casein from its aqueous solution by ultrasonic treatment assisted foam fractionation: Inhibiting molecular aggregation

2020 ◽  
Vol 284 ◽  
pp. 110042
Author(s):  
Yi Zhang ◽  
Ruipeng Di ◽  
Huixin Zhang ◽  
Wenjun Zhang ◽  
Zhaoliang Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ultrasonic Treatment ◽  
Foam Fractionation ◽  
Molecular Aggregation

Measurement of Complex Dielectric Permittivity of Quartz Systems

2019 ◽  
Vol 946 ◽  
pp. 129-133
Author(s):  
Vitaly Smolko ◽  
Elizaveta Antoshkina
Keyword(s):  
Aqueous Solution ◽  
Dielectric Permittivity ◽  
Polyvinyl Alcohol ◽  
Specific Surface ◽  
Ultrasonic Treatment ◽  
Complex Dielectric Permittivity ◽  
Active Centers ◽  
Sand Surface ◽  
Quartz Sands

The article describes the problem of the experimental determination of complex dielectric permittivity for natural, activated, and modified quartz systems. The results of determination of specific surface, complex dielectric permittivity, sands porosity are presented in this article. The authors obtained the empirical equation of complex dielectric permittivity calculation for natural, activated, and modified quartz sands, taking into account the effect of moisture, specific surface, porosity, impurities content into consideration. The modification of the sand surface by means of mechanical beneficiation and ultrasonic treatment leads to reduction of complex dielectric permittivity and specific surface, thus contributing to the increase of the active centers quantity on the sands surface. The modification of the sand surface by polyvinyl alcohol aqueous solution leads to increase of complex dielectric permittivity. Polyvinyl alcohol aqueous solution modification envisages the creation of new active centers by oligomers inoculation to the surface and blocking the clay component and authigenous film ingredients. Among the considered methods, ultrasonic treatment in aqueous solution and mechanical beneficiation are the most efficient and technologically acceptable ways of activation.

Removal of trace Cu2+ from aqueous solution by foam fractionation

Desalination ◽  
2009 ◽  
Vol 249 (2) ◽  
pp. 503-506 ◽  
Author(s):  
Jian Zhang ◽  
Yingjun Jing ◽  
Zhaoliang Wu ◽  
Qian Li
Keyword(s):  
Aqueous Solution ◽  
Foam Fractionation

Enhancement of saccharin removal from aqueous solution by activated carbon adsorption with ultrasonic treatment

2006 ◽  
Vol 13 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Eileen C. Bernardo ◽  
Tadashi Fukuta ◽  
Takafumi Fujita ◽  
Erwin P. Ona ◽  
Yoshihiro Kojima ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Ultrasonic Treatment ◽  
Activated Carbon Adsorption ◽  
Carbon Adsorption

Recovery of Surfactant from an Aqueous Solution Using Continuous Multistage Foam Fractionation: Mixed Surfactant System

2013 ◽  
Vol 48 (5) ◽  
pp. 757-765 ◽  
Author(s):  
Visarut Rujirawanich ◽  
Manutchanok Triroj ◽  
Orathai Pornsunthorntawee ◽  
Jittipan Chavadej ◽  
Sumaeth Chavadej
Keyword(s):  
Aqueous Solution ◽  
Foam Fractionation ◽  
Mixed Surfactant ◽  
Mixed Surfactant System ◽  
Surfactant System

scholarly journals Investigation of the Effect of Concentration on Molecular Aggregation of Cyanine Dyes in Aqueous Solution

2011 ◽  
Vol 9 (4) ◽  
Author(s):  
John Kunzler ◽  
Leen Samha ◽  
Renwu Zhang ◽  
Hussein Samha
Keyword(s):  
Aqueous Solution ◽  
Emission Spectroscopy ◽  
Visible Region ◽  
Cyanine Dyes ◽  
Cyanine Dye ◽  
Molecular Aggregation ◽  
Monomeric Form ◽  
Strong Emission ◽  
Absorption And Emission ◽  
Absorption And Emission Spectroscopy

The aggregation of the cyanine dye, 3,3’-disulfobutyl-5,5’-dichloro thiacarbocyanine triethylamine, (NK-3796) in aqueous solution was investigated using absorption and emission spectroscopy. The equilibrium, n(monomer) ⇆ n(dimer) ⇆ (H-aggregate)n , was observed over a series of dye concentrations ranging from 10-4 mM to 0.1mM. At concentrations <10-3 mM, the dye exists in solution mostly in the monomeric form. However, dimers become more significant when the concentration of the dye exceeds 10-2 mM. Unlike the substituted dye in the 9th position, the NK-3796 dye tends to form H-aggregates at higher concentration (>10-1 mM). Monomers and dimers exhibit strong emission in the visible region. Also notable, is that the emission from the H-aggregates was very weak due to self quenching.

scholarly journals THE USE OF ULTRASOUND IN THE PREPARATION OF THE CATALYST Ru/HPS MN 100 AND ITS ACTIVITY IN THE PROCESS OF HYDROGENATION OF XYLOSE AND LACTOSE

2021 ◽  
pp. 41-48
Author(s):  
Максим Евгеньевич Григорьев ◽  
Роман Викторович Бровко ◽  
Евгений Олегович Долуда
Keyword(s):  
Aqueous Solution ◽  
Partial Pressure ◽  
Catalytic System ◽  
Ultrasonic Treatment ◽  
Ruthenium Catalyst ◽  
Hydrogenation Process ◽  
Continuous Reactor ◽  
Optimal Conditions ◽  
Type Reactor ◽  
Kinetic Testing

В работе рассмотрена возможность использование ультразвука при получении рутений содержащей каталитической системы Ru/СПС MN 100. Проведено кинетическое тестирование данного катализатора и сравнение его активности с таким же катализатором, но синтезированным без использования ультразвука, в процессе гидрирования ксилозы и лактозы до соответствующих полиолов - ксилита и лактита. Процесс гидрирования осуществлялся в реакторе периодического и непрерывного действия при оптимальных условиях (температуре, концентрации моно- и дисахарида, парциальном давлении водорода, скорости подачи водного раствора ксилозы и лактозы и скорости подачи водорода). Установлено, что ультразвуковая обработка рутениевого катализатора способствует повышению его активности, что отражается на увеличении конверсии моно- и дисахарида при проведении процесса в периодических условиях, при этом практически не происходит изменения конверсии субстратов при их гидрировании в реакторе проточного типа. The paper considers the possibility of using ultrasound in the production of ruthenium-containing catalytic system Ru/SPS MN 100. Kinetic testing of this catalyst was carried out and its activity was compared with the same catalyst, but synthesized without the use of ultrasound, in the process of hydrogenation of xylose and lactose to the corresponding polyols - xylitol and lactite. The hydrogenation process was carried out in a periodic and continuous reactor under optimal conditions (temperature, concentration of mono - and disaccharide, partial pressure of hydrogen, the rate of supply of an aqueous solution of xylitol and lactite and the rate of supply of hydrogen). It was found that ultrasonic treatment of the ruthenium catalyst contributes to an increase in its activity, which is reflected in an increase in the conversion of mono - and disaccharide during the process under periodic conditions, while there is practically no change in the conversion of substrates during their hydrogenation in a flow-type reactor.

scholarly journals Partially Acetylated Cellulose Dissolved in Aqueous Solution: Physical Properties and Enzymatic Hydrolysis

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1734 ◽  
Author(s):  
Alfassi ◽  
Rein ◽  
Shpigelman ◽  
Cohen
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Enzymatic Hydrolysis ◽  
Cellulose Acetate ◽  
Persistence Length ◽  
Water Soluble ◽  
High Rate ◽  
Cellulose Derivatives ◽  
Molecular Aggregation ◽  
Cellulose Dissolution

Cellulose acetate is one of the most important cellulose derivatives. The use of ionic liquids in cellulose processing was recently found to act both as a solvent and also as a reagent. A recent study showed that cellulose dissolution in the ionic liquid 1-ethyl-3-methylimidazoliumacetate (EMIMAc) mixed with dichloromethane (DCM) resulted in controlled homogenous cellulose acetylation; yielding water-soluble cellulose acetate (WSCA). This research investigated the properties of cellulose acetate prepared in this manner, in an aqueous solution. The results revealed that WSCA fully dissolves in water, with no significant sign of molecular aggregation. Its conformation in aqueous solution exhibited a very large persistence length, estimated as over 10 nm. The WSCA exhibited surface activity, significantly reducing the surface tension of water. Because of the molecular dissolution of WSCA in water, augmented by its amphiphilicity, aqueous solutions of WSCA exhibited an overwhelmingly high rate of enzymatic hydrolysis.

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