Modeling temperature and reaction time impacts on hematite nanoparticle size during forced hydrolysis of ferric chloride

2012 ◽  
Vol 210 ◽  
pp. 357-362 ◽  
Author(s):  
Chao-An Chiu ◽  
Kiril D. Hristovski ◽  
Richard Dockery ◽  
Kyle Doudrick ◽  
Paul Westerhoff
Keyword(s):  
Reaction Time ◽  
Ferric Chloride ◽  
Nanoparticle Size ◽  
Forced Hydrolysis ◽  
Hydrolysis Of

Forced hydrolysis of FeCl3 solutions in the presence of guanylurea phosphate

2022 ◽  
Vol 634 ◽  
pp. 128047
Author(s):  
Marko Robić ◽  
Mira Ristić ◽  
Stjepko Krehula ◽  
Svetozar Musić
Keyword(s):  
Forced Hydrolysis ◽  
Hydrolysis Of

Formation of hybrid colloids by suspension polycondensation in the presence of hydrophilic block copolymers

2002 ◽  
Vol 726 ◽  
Author(s):  
Corine Gerardin ◽  
Valérie Buissette ◽  
François Gaudemet ◽  
Olivier Anthony ◽  
Nicolas Sanson ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Colloidal Suspensions ◽  
Surface Charges ◽  
Inorganic Particles ◽  
Hydrous Oxides ◽  
Stabilization Phase ◽  
Metal Ratio ◽  
Forced Hydrolysis ◽  
Hydrolysis Of

AbstractDouble hydrophilic block copolymers were used to control the growth of inorganic particles and directly prepare hybrid colloidal suspensions. Colloids of metal hydrous oxides were obtained by forced hydrolysis of metal ions in presence of the copolymers. The block copolymers contain a metal-complexing polyelectrolyte block and a stabilizing neutral block. The role of the first block is to ensure a controlled growth of the inorganic phase, while simultaneously, the second block ensures the colloidal stabilization. Phase diagrams presenting the conditions under which precipitation is inhibited are established. The nanoparticles are then characterized in terms of sizes, morphologies and surface charges. The main parameters controlling the size were identified: the copolymer-to-metal ratio and the metal prehydrolysis ratio. The synthesis steps were characterized. First, a key step of induced micellization of the hydrophilic copolymers leads to hybrid core-shell assemblies. The second step consists in mineralization of the micellar core. The suspension polycondensation leads to hairy particles whose morphologies depend on the nature of the metal and on synthesis parameters.

Enhanced enzymatic hydrolysis of sugarcane bagasse with ferric chloride pretreatment and surfactant

2017 ◽  
Vol 229 ◽  
pp. 96-103 ◽  
Author(s):  
Hongdan Zhang ◽  
Guangying Ye ◽  
Yutuo Wei ◽  
Xin Li ◽  
Aiping Zhang ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Sugarcane Bagasse ◽  
Ferric Chloride ◽  
Hydrolysis Of

Synthesis of Epihalohydrins by Dehydrohalogenation of Glycerol Dihalohydrins - Utilization of a Basic Ion-Exchange Resin

1992 ◽  
Vol 45 (8) ◽  
pp. 1327
Author(s):  
M Dargelos ◽  
ME Borredon ◽  
A Gaset
Keyword(s):  
Reaction Time ◽  
Ion Exchange ◽  
Room Temperature ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Organic Medium ◽  
Short Reaction Time ◽  
Hydrolysis Of

Dehydrohalogenation of a mixture of glycerol 1,3- and 2,3-dihalohydrins by a strong basic ion-exchange resin (IRA 440 and A 26) at room temperature in an organic medium quantitatively leads to the corresponding epihalohydrin (1a; X = Cl), and (1b; X = Br) in a very short reaction time. Hydrolysis of the epihalohydrin does not occur under these conditions.

Efficient Hydrolytic Breakage of β-1,4-Glycosidic Bond Catalyzed by a Difunctional Magnetic Nanocatalyst

2018 ◽  
Vol 71 (8) ◽  
pp. 559 ◽  
Author(s):  
Ren-Qiang Yang ◽  
Ni Zhang ◽  
Xiang-Guang Meng ◽  
Xiao-Hong Liao ◽  
Lu Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Microcrystalline Cellulose ◽  
Significant Loss ◽  
Reducing Sugar ◽  
Magnetic Nanocatalyst ◽  
Efficient Catalyst ◽  
Glycosidic Bonds ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of

A novel difunctional magnetic nanocatalyst (DMNC) was prepared and used to catalyse the hydrolytic breakage of β-1,4-glycosidic bonds. The functional nanoparticle displayed excellent catalytic activity for hydrolysis of cellobiose to glucose under moderate conditions. The conversion of cellobiose and yield of glucose could reach 95.3 and 91.1 %, respectively, for a reaction time of 6 h at pH 4.0 and 130°C. DMNC was also an efficient catalyst for the hydrolysis of cellulose: 53.9 % microcrystalline cellulose was hydrolyzed, and 45.7 % reducing sugar was obtained at pH 4.0 and 130°C after 10 h. The magnetic catalyst could be recycled and reused five times without significant loss of catalytic activity.

Response Surface Methodology Optimization and Kinetic Study of Ultrafiltration-Enhanced, SCER-catalyzed Hydrolysis of Lard

2019 ◽  
Vol 17 (8) ◽  
Author(s):  
Enmin Lv ◽  
Shaoxuan Ding ◽  
Jie Lu ◽  
Zhuang Li ◽  
Lixiong Du ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Reaction Time ◽  
Response Surface ◽  
Membrane Separation ◽  
Molar Ratio ◽  
Transmembrane Pressure ◽  
Cleaning Efficiency ◽  
Membrane Cleaning ◽  
Exponential Factor ◽  
Hydrolysis Of

Abstract The integration process of polyethersulphone (PES) ultrafiltration with catalytic hydrolysis of lard was optimized by response surface methodology (RSM). The influences of molar ratio of water to lard, reaction time and transmembrane pressure on the fatty acids (FAs) yield were investigated. Results showed that the maximum FAs yield of 99.52 % was obtained under the optimized conditions of molar ratio of water to lard of 6.0:1.0, reaction time of 10.0 h and transmembrane pressure of 100.0 kPa. Moreover, the membrane cleaning efficiency was studied after four cleanings. Furthermore, the kinetic model of membrane separation process was investigated and the activation energy and pre-exponential factor were determined.

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