Flexibility Modification of Konjac Glucomannan Film by Deacetylation

2009 ◽  
Vol 610-613 ◽  
pp. 1248-1251 ◽  
Author(s):  
Yan Chen ◽  
Xiao Yan Lin ◽  
Xue Gang Luo ◽  
Ying Ting Kang
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Calcium Hydroxide ◽  
Sodium Carbonate ◽  
Sodium Phosphate ◽  
Konjac Glucomannan ◽  
Glass Plates

Konjac glucomannan (KGM) were modified by deacetylation with sodium hydroxide, calcium hydroxide, sodium carbonate, sodium phosphate, respectively and mechanical properties of modified KGM films were investigated. The modification mechanism was explored by FTIR. Results show that deacetylation of KGM play an important role on the flexibility of the modified membranes, and the flexibilities vary with different modifiers. The flexibility of the films modified by sodium hydroxide is significantly higher than that of the others. The modified films with good flexibility were prepared by simple steps as follows: NaOH modifiers and KGM (1%) were added to water, stirred until the pH arrived at 9. And then the KGM swelled at the temperature of 50°C for 2 hours, the modified KGM sol was cast onto glass plates, the modified membranes were formed after dried at 50°C.

Uranium recovery from phosphate ores through sintering

1983 ◽  
Vol 61 (10) ◽  
pp. 2341-2343 ◽  
Author(s):  
L. A. Guirguis
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Carbonate ◽  
Sodium Phosphate ◽  
Moderate Temperature ◽  
Low Grade ◽  
Uranium Recovery ◽  
Phosphate Ores

The use of an alkaline reactant for phosphate processing is an alternative to the current methods of using acid reagents.In this work the possibilities of attacking low-grade phosphate ores by sintering with sodium carbonate at moderate temperature are considered. The carbonate liquor obtained by a water leach contains uranium in the form of uranyl tricarbonate complex, as well as the equivalent dissolved phosphate. Uranium from such liquor was recovered as sodium uranate on addition of sodium hydroxide, while pure sodium phosphate, useful as a chemical, was recovered by fractional crystallization.Finally, a flowsheet was designed for the proposed process.

Study on the Structure and Properties of Natural Color Silk Treated by Alkali

2011 ◽  
Vol 175-176 ◽  
pp. 760-764 ◽  
Author(s):  
Kai Jing ◽  
Yun Zhang ◽  
Xiang Rong Wang
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Young’S Modulus ◽  
Sodium Carbonate ◽  
Young's Modulus ◽  
Degree Of Crystallinity ◽  
Structure And Properties ◽  
Breaking Elongation ◽  
Natural Color ◽  
The Degree Of Crystallinity

The natural color silk has been treated by sodium hydroxide and sodium carbonate，and the structure, crystallize and mechanical properties of the treated natural color silk were studied. The results showed that the structure of natural color silk was not changed and the degree of crystallinity decreased; the crystallinity of un-treated natural color silk was 44.4%, while the crystallinities of natural color silk treated by sodium hydroxide and sodium carbonate were 35.2% and 43.6%, respectively. The breaking tenacity and the breaking elongation of natural color silk treated by sodium hydroxide dropped dramatically and the Young’s Modulus declined; but these properties of natural color silk were not changed significantly after being treated by sodium carbonate.

scholarly journals Recovery of Zinc from Treatment of Spent Acid Solutions from the Pickling Stage of Galvanizing Plants

2021 ◽  
Vol 13 (1) ◽  
pp. 407
Author(s):  
Svetlana B. Zueva ◽  
Francesco Ferella ◽  
Valentina Innocenzi ◽  
Ida De Michelis ◽  
Valentina Corradini ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Sodium Hydroxide ◽  
Calcium Hydroxide ◽  
State Of The Art ◽  
Zinc Content ◽  
Economic Viability ◽  
Acid Solutions ◽  
Physical Chemical ◽  
Galvanic Sludge ◽  
Valuable Metals

Typical methods for the treatment of waste pickling solutions include precipitation by alkaline reagents, most commonly calcium hydroxide. As a result, large volumes of galvanic sludge form, containing iron, calcium, sulphates, and a relatively small quantity of zinc (<20%), making Zn recovery not profitable. In summary, state-of-the-art Zn galvanization processes entail the loss of valuable metals and the irrational and expensive handling of spent pickling solutions (SPSs). The resulting conclusion is that there is room for a significant improvement in the way SPSs are treated, with the double goal of enhancing Zn galvanization methods’ economic viability and achieving a lesser impact on the environment’s processes. The experimental results show that it is possible to use SPS as a coagulant to treat the process wastewaters, kept separated, and added with sodium hydroxide. The results in obtaining precipitates with Zn contents higher than 40%, increasing the added advantage of making Zn recovery profitable. The results show the possibility of using SPS as a coagulant in the process of physical-chemical wastewater treatment and sodium hydroxide to obtain a precipitate with a zinc content of more than 40%.

Effect of Sodium Hydroxide, Calcium Hydroxide, and Potassium Hydroxide on Debranning of Corn

1997 ◽  
Vol 74 (3) ◽  
pp. 254-257 ◽  
Author(s):  
S. K. Singh ◽  
N. Singh ◽  
L. Du ◽  
S. R. Eckhoff
Keyword(s):  
Sodium Hydroxide ◽  
Calcium Hydroxide ◽  
Potassium Hydroxide

Comparison of sodium hydroxide and calcium hydroxide pretreatments of giant reed for enhanced enzymatic digestibility and methane production

2017 ◽  
Vol 244 ◽  
pp. 1150-1157 ◽  
Author(s):  
Danping Jiang ◽  
Xumeng Ge ◽  
Quanguo Zhang ◽  
Xuehua Zhou ◽  
Zhou Chen ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Calcium Hydroxide ◽  
Methane Production ◽  
Giant Reed ◽  
Enzymatic Digestibility

scholarly journals Characterization and Performance of Mechanical Properties of GGBS Based Geo Polymer Mortars

2019 ◽  
Vol 8 (4) ◽  
pp. 8336-8342
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Construction Industry ◽  
Research Paper ◽  
Setting Times ◽  
And Performance ◽  
Creep And Shrinkage

From decades it has been recognized that Geopolymer will considerably replace the role of cement in the construction industry. In general, Geopolymer exhibits the property of the peak compressive strength, minimal creep and shrinkage. In this current research paper, Geopolymer mortar is prepared by using GGBS and Fly ash. The mix proportions are of (100-60)%GGBS with Fly ash by 10% replacement. The alkali activators Na0H and Na2Sio3 are used in the study for two different molarities of 4&8. The ratio to Sodium silicates to sodium hydroxide is maintained from 1.5, 2, 2.5 & 3 were used. Mortars are prepared and studied the effect of molarities of alkali activators in their setting times and strengths

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