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1987-8-1 · Colloids and Surfaces, 25 (1987) 101-109 101 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands Adsorption Kinetics of Cationic Polyacrylamide onto Cellulose Fibres* DULESWAR MAHANTA**, BANI P. CHALIHA and JOGENDRA N. BARUAH Division of Paper and Board, Regional Research Laboratory, Jorhat-785006, Assam (India) (Received 12 May 1986; …
Get Price2005-3-17 · Cationic polyacrylamide (C-PAM) is currently, either alone or in combination with a second component, the dominating polyelectrolyte used to enhance retention and dewatering. The work presented in this thesis report describes the adsorption of C-PAM and silica onto a model surface and on fibres and its effect on fibre flocculation.
Get PricePolyacrylamides of different molecular weight, charges and dosages allow to control the retention and distribution of nanoparticles (NPs) in composites, and optimise composite properties and functionality. Our aim is to evaluate the effect of high molecular weight (13 MDa) cationic polyacrylamide (CPAM) charge and dosage on SiO2 (74 nm) NP's assembly in cellulose nanofibers composites.
Get Price2015-12-15 · The cationic cellulose–graft–polyacrylamide flocculant (CC‐g‐PAM) based on CC and polyacrylamide (PAM) was also synthesized in a homogeneous aqueous solution. The flocculation characteristics of CC and CC‐g‐PAM were evaluated in a kaolin suspension. The results showed that CC‐g‐PAM was an effective flocculant for the kaolin ...
Get Price2020-9-15 · Here, q e is the equilibrium adsorption capacity (mg/g), q m is the maximum adsorption capacity (mg/g), k L is the Langmuir adsorption constant that represents the binding energy, k F and n are the Freundlich model constants, b T (kJ/mol) and A T (l/g) constants of the Temkin model, R of the gaseous constants, T (K) absolute temperature, ε of the polynomial and β of the activity coefficient ...
Get Price2015-12-15 · The cationic cellulose–graft–polyacrylamide flocculant (CC-g-PAM) based on CC and polyacrylamide (PAM) was also synthesized in a homogeneous aqueous solution. The flocculation characteristics of CC and CC-g-PAM were evaluated in a kaolin suspension. The results showed that CC-g-PAM was an effective flocculant for the kaolin suspension under ...
Get Price2009-7-9 · Adsorption of cationic polyacrylamides, with different degrees of substitution, on bleached softwood pulp as a function of salt, NaCl, concentration. The adsorption is shown in % of polymer on the fibres(i.e. 1%=10mg/g). Polymer addition was 1 % (10mg/g) and …
Get PriceThis study explores the benefits of using bagasse microfibrillated cellulose (MFC) in bagasse paper. Two different types of MFC were produced from DED bleached soda bagasse pulp. The MFC was added to soda bagasse pulp furnishes in different amounts. Cationic polyacrylamide (C-PAM) was selected as retention aid. The results show that addition of MFC increased the strength of paper as expected.
Get Price2015-3-1 · High molecular-weight, cationic and water-soluble cellulose-based polyelectrolytes were synthesized and their performance in water purification was tested. Dissolving pulp samples were acylated with chlorobetainyl chloride in dimethylacetamide/lithium chloride to obtain betaine esters of cellulose (cellulose betainates). A series of application tests was carried out with samples of different ...
Get PriceThe present invention discloses a process for manufacturing a grafted polyacrylamide flocculant of cationic/ampholytic ions, which is characterized by graft-copolymerizing starch or micro-crystalline cellulose as backbone with acrylamide, while using potassium permanganate as initiator, hydrolyzing and thereafter reacting with alkyl-amino-carbinol.
Get PriceThe layer thickness and density of high molecular weight cationic polyacrylamide (CPAM) adsorbed at the cellulose-water interface was quantified by neutron reflectometry. The thickness of a full monolayer of CPAM of constant molecular weight (13MD) but different charge densities, adsorbed with or without NaCl (10-3-3 M NaCl decreased the thickness ...
Get Price2005-3-17 · Cationic polyacrylamide (C-PAM) is currently, either alone or in combination with a second component, the dominating polyelectrolyte used to enhance retention and dewatering. The work presented in this thesis report describes the adsorption of C-PAM and silica onto a model surface and on fibres and its effect on fibre flocculation.
Get PricePolyacrylamides of different molecular weight, charges and dosages allow to control the retention and distribution of nanoparticles (NPs) in composites, and optimise composite properties and functionality. Our aim is to evaluate the effect of high molecular weight (13 MDa) cationic polyacrylamide (CPAM) charge and dosage on SiO2 (74 nm) NP's assembly in cellulose nanofibers composites.
Get PriceCationic polyacrylamide, C-PAM, (Kemira Chemicals Oy, Finland) with molecular weight (Mw) of 1.4 million g/mol and charge density (CD) of 1.8 meq/g (17 mol-%) was used (Salmi et al. 2007a). C-PAM was ultra-filtrated with different cut-offs to narrow the Mw distribution. The inorganic silica nanoparticles had a surface area of
Get Price2009-7-9 · Adsorption of cationic polyacrylamides, with different degrees of substitution, on bleached softwood pulp as a function of salt, NaCl, concentration. The adsorption is shown in % of polymer on the fibres(i.e. 1%=10mg/g). Polymer addition was 1 % (10mg/g) and …
Get Price2017-11-3 · α-cellulose content 95.6%, intrinsic viscosity 566.5 mL/g. FiberCare D, an endoglucanase-rich cellulase was provided by Novozymes A/S (Denmark). cellulase The activity is 35000 U/mL determined by sodium carboxymethyl cellulose activity. Cationic polyacrylamide (CPAM, molecular weight 1 MDa) was received from
Get Price2018-6-5 · Our aim is to evaluate the effect of high molecular weight (13 MDa) cationic polyacrylamide (CPAM) charge and dosage on SiO2 (74 nm) NP's assembly in cellulose nanofibers composites. Engineered cellulose/SiO2 composites were investigated by SEM, SAXS and DLS. SEM images show the local area retention of NPs into the cellulose matrix.
Get Price2021-7-15 · Nanofibrillated cellulose (NFC) and a combined systems of NFC with cationic starch or cationic polyacrylamide were used in place of long-fiber chemical pulp in manufacturing currency paper from waste lint fibers from the textile industry. Handmade papers (60 g) were produced from each treatment, and the physical, mechanical, and optical ...
Get Pricecationic dye, from aqueous solutions. ... In comparison withitsprecursors,carboxymethylcellulose(CMC)and polyacrylamide CMC-g-PAM, CMC-g-HPAM exhib- ... cellulose and its derivatives have a very ...
Get PriceThe present invention discloses a process for manufacturing a grafted polyacrylamide flocculant of cationic/ampholytic ions, which is characterized by graft-copolymerizing starch or micro-crystalline cellulose as backbone with acrylamide, while using potassium permanganate as initiator, hydrolyzing and thereafter reacting with alkyl-amino-carbinol.
Get PriceThe layer thickness and density of high molecular weight cationic polyacrylamide (CPAM) adsorbed at the cellulose-water interface was quantified by neutron reflectometry. The thickness of a full monolayer of CPAM of constant molecular weight (13MD) but different charge densities, adsorbed with or without NaCl (10-3-3 M NaCl decreased the thickness ...
Get PriceDr. Bruce Perrault, Ph.D , (Georgia Institute of Technology (Georgia Tech), USA) Fluorocompounds areone of the important parts of our daily life, concerning alimentation, health care or leisure time as well as the alternative energy sector, which is of an increasing significance in times of …
Get PriceOur aim is to evaluate the effect of high molecular weight (13 MDa) cationic polyacrylamide (CPAM) charge and dosage on SiO 2 (74 nm) NP's assembly in cellulose nanofibers composites. Engineered cellulose/SiO 2 composites were investigated by SEM, SAXS and DLS. SEM images show the local area retention of NPs into the cellulose matrix.
Get Priceabstract = 'The layer thickness and density of high molecular weight cationic polyacrylamide (CPAM) adsorbed at the cellulose-water interface was quantified by neutron reflectometry. The thickness of a full monolayer of CPAM of constant molecular weight (13MD) but different charge densities, adsorbed with or without NaCl (10-3M), was studied.
Get Price2018-6-6 · substances, such as cationic starch,4,5) and cationic polyacrylamide,6) has been shown to decrease the amount of polymer that is adsorbed on cellulose. This is explained by the lower amount needed to compensate for the surface charge and reach charge neutrality.5) The molecular weight of the cationic polymer is another
Get Price2010-10-7 · The effect of polymer adsorption kinetics and ionic strength on the dynamics of particle flocculation was quantified using a model system consisting of precipitated calcium carbonate (PCC) and cationic polyacrylamide (CPAM) at a low shear rate. All early flocculations detectable by a photodispersion analyzer (PDA) happened in nonequilibrium polymer adsorption regimes. We …
Get Price2018-11-1 · PEI was shown to have a larger effect than CPAM and CS, and generate a total sugar concentration of 73.9 g/L. Improvement in hydrolysis with cationic polymer addition is attributed to increased cellulase adsorption on cellulose through electrostatic attraction, rather than enhancement of cellulase activity.
Get Price2021-6-2 · The abbreviation of polyacrylamide is PAM, it is a chemical which purchased in dry, emulsion, liquid and tablet form. Polyacrylamide can be carbonated into black powder at 210οC without oxygen. Polyacrylamide could be made to four series,e.g., non-ion polyacrylamide,zwitterionic polyacrylamide, cationic polyacrylamide CPAM, and anionic ...
Get PriceCationic Polyacrylamide (CPAM) 69418-26-4,Powerful foculant widely used in industrial and municipal water treatment_OKCHEM. Please note that all emails sent by OKCHEM are from ***@okchem.com, [email protected] okchemvip.com, or [email protected]
Get Pricecationic dye, from aqueous solutions. ... In comparison withitsprecursors,carboxymethylcellulose(CMC)and polyacrylamide CMC-g-PAM, CMC-g-HPAM exhib- ... cellulose and its derivatives have a very ...
Get Price2020-2-1 · polyacrylamide flocculants (cationic, anionic and nonionic) of varying ionic character in the presence of cetyl trimethyl ammonium bromide (CTAB), SDS, and Triton-X 100. Karlson et al. [25] explored the interaction of two cellulosic polymers, ethyl hydroxyethyl cellulose …
Get PriceCationization of Eucalyptus wood waste pulps with diverse lignin contents for potential application in colored wastewater treatment Kinga Grenda, ab Jose A. F. Gamelas,´ a Julien Arnold,b Olivier J. Cayrec and Maria G. Rasteiro *a Modification of cellulosic-rich materials suchas Eucalyptus wood wasteand productionof cellulose-based
Get PriceCationic polyacrylamide was added at 0.05, 0.1, and 0.15%, and cellulose nanofiber was added at 0.1, 0.5, 1, and 2% based on pulp O.D. Laboratory handsheets were prepared (60 g/m2), and optical ...
Get Price2014-8-13 · This work examines the addition of cationic polymers, cationic polyacrylamide (CPAM) and polyamide–amine–epichlorohydrin (PAE), to cellulose nanofibres to produce superior forming characteristics. The addition of 2 mg of high MW CPAM/g of nanofibres halved the drainage time to under 1 min at 0.1 wt% solids content due to increasing the floc size and the fibre forming a bulky and …
Get PriceCinnamic acid grafted carboxymethyl cellulose (CMC-g-P (CA)) has been synthesized by microwave assisted technique, which is an alliance of microwave radiation with chemical free radical initiator (CAN) to commence grafting. The novel graft copolymer has been characterized by physicochemical techniques – FTIR spectroscopy, intrinsic viscosity measurement, elemental analysis (C, H and N), SEM ...
Get PriceWhen choosing organic flocculant formulations (e.g., polyacrylamide PAM), it mainly depends on the anionic polyacrylamide, cationic polyacrylamide non-ionic polyacrylamide to be used. Anionic polyacrylamide is generally divided into weak anion, medium anion, and strong anion, depending on the degree of hydrolysis.
Get PriceThe effects of the graphene and cationic polyacrylamide on cellulose/graphene conductive paper brightness are sh ow n iT ab l e2. rg t f cu p is 77.9%, which is decreased to 41.1% after adding 2wt% graphene. For the same addition of graphene, the addition of 0.02 wt% cationic polyacrylamide further decreases the brightness of the cellulose/graphene
Get Price2021-7-16 · Cationic polyacrylamide. The solution of cationic acrylamide copolymer was prepared by the method used by Charani et al. (2013). First, 0.01 g of polyacrylamide with a molecular weight of 359188 g/mol was poured to a 100-mL flask.
Get PriceOther new cellulose-based products, such as microcrystalline cellulose (MCC), nanocrystalline cellulose (NCC), and nanofibrillated cellulose (NFC) are emerging ( Jahan et al., 2011; Tang et al., 2014 ). The dissolving pulp with high cellulose content (92–98%) and minimum impurities ( e.g. , hemicellulose, lignin and extractives) is a growing ...
Get PriceCationization of Eucalyptus wood waste pulps with diverse lignin contents for potential application in colored wastewater treatment Kinga Grenda, ab Jose A. F. Gamelas,´ a Julien Arnold,b Olivier J. Cayrec and Maria G. Rasteiro *a Modification of cellulosic-rich materials suchas Eucalyptus wood wasteand productionof cellulose-based
Get Price2021-4-8 · Although the rheology of cellulose nanocrystalline (CNC) suspensions has been widely studied, less attention has been paid to the modified cellulose nanocrystals such as cationic and anionic cellulose hydrogels.
Get PriceA novel hybrid flocculant of acrylamide and cellulose was synthesized by using microwave irradiation method. Cellulose was extracted from kenaf by using TAPPI method. 57.4% of percentage grafting and efficiency has been obtained from the grafting process. The hybrid flocculant properties were characterized by using FTIR spectroscopy, FESEM and elemental analysis.
Get Price2012-12-24 · Polymerization of cationic monomers and chemical reactions of polymers are two popular ways to produce cationic polymers. The second method can be further divided into two different cationic modifications based on synthetic polymers (e.g., polyacrylamide) [8,9] and natural polymers (e.g. starch, cellulose, chitin, lignose), respectively.
Get Price2021-5-25 · Table1 [21]. Cationic polyacrylamide (CPAM) with a molecular weight ranging from 8 mil-lion to 18 million Da and ionization degree of 25% was obtained commercially (Shenghuang Chemical Products Co., Ltd., Liaocheng, Shandong, China). Table 1. Properties of calcium lignosulfonate. Mw (g/mol) 18,000 Mn (g/mol) 2500 pH 2.0–4.0 Insoluble (%) 1.5 max
Get Price2021-7-14 · amphiphilic cellulose nanocrystals for pH-responsive Pickering emulsions [J], Carbohydrate Polymers, 2020, 229: 115401 ... Application of Tertiary Amine Cationic Polyacrylamide with High Cationic Degree in Salt-free Dyeing of Reactive Dyes,Teng , 18 ...
Get Price2021-4-21 · oil absorbent polyacrylamide granules in angola; oil absorbent polyacrylamide granules in angola. oil absorbent polymer pam, oil absorbent polymer pam. About 2% of these are Electronics Chemicals, 1% are Water Treatment Chemicals, and 2% are Leather Auxiliary Agents. A wide variety of oil absorbent polymer pam options are available to ...
Get Price2018-10-30 · series form molecular weight product example; flopam: powder: ultra high: fo 4490 vhm: flopam: powder: very high: fo 4440 ssh: flopam: powder: high: fo 4550 sh shu ...
Get Price2015-10-15 · Their flocculation performance was compared with that of commercial cationic polyacrylamide and poly aluminium chloride flocculants. The positive results showed that the NaOH/Urea solvent effectively promoted the dialdehyde cellulose (DAC) …
Get Price2021-4-8 · Although the rheology of cellulose nanocrystalline (CNC) suspensions has been widely studied, less attention has been paid to the modified cellulose nanocrystals such as cationic and anionic cellulose hydrogels.
Get Price2000-10-1 · October 1, 2000. Cationic Pretreatments Of Cotton. Fiber treatment before dyeing reduces environmental pollutants, increases dye. affinity. Despite the widespread acceptance and demand for cotton apparel, there are. still some significant problems remaining with the wet processing of cotton fabrics.Considerable.
Get PriceCinnamic acid grafted carboxymethyl cellulose (CMC-g-P (CA)) has been synthesized by microwave assisted technique, which is an alliance of microwave radiation with chemical free radical initiator (CAN) to commence grafting. The novel graft copolymer has been characterized by physicochemical techniques – FTIR spectroscopy, intrinsic viscosity measurement, elemental analysis (C, H and N), SEM ...
Get PriceCarboxymethyl cellulose (CMC) is one of the most promising cellulose derivatives. Due to its characteristic surface properties, mechanical strength, tunable hydrophilicity, viscous properties, availability and abundance of raw materials, low-cost synthesis process, and likewise many contrasting aspects, it is now widely used in various advanced application fields, for example, food, paper ...
Get PriceWhen choosing organic flocculant formulations (e.g., polyacrylamide PAM), it mainly depends on the anionic polyacrylamide, cationic polyacrylamide non-ionic polyacrylamide to be used. Anionic polyacrylamide is generally divided into weak anion, medium anion, and strong anion, depending on the degree of hydrolysis.
Get Priceabstract = 'The layer thickness and density of high molecular weight cationic polyacrylamide (CPAM) adsorbed at the cellulose-water interface was quantified by neutron reflectometry. The thickness of a full monolayer of CPAM of constant molecular weight (13MD) but different charge densities, adsorbed with or without NaCl (10-3M), was studied.
Get Price2003-2-20 · a solution polymerization, the tagged polyacrylamide (PAM) and its copolymer with the sulfonated monomer (PAMS) were prepared following the procedure for a precipitation polymerization as described by Wada, Sekiya, and Machi.26 Acrylamide (19.9 g) and 14C-labeled acrylamide (0.06 g…
Get Price1992-7-13 · @article{osti_7116680, title = {Cationic polymer mud solves gumbo problems in North Sea}, author = {Welch, O and Lee, L J}, abstractNote = {This paper reports on a recently developed cationic polymer mud, compatible with conventional polymer additives and designed to meet environmental regulations, which significantly minimized the gumbo problems common to the water-sensitive shales …
Get Pricemore efficient aggregates. Cationic starch (CS), cationic polyacrylamide (CPAM), and bentonite obtained from a paper factory were used as strengthening and retention agents. 2.2 Methods 2.2.1 MFC preparation (1) TEMPO oxidation of cellulose[ 12- 3]: The wet pulp was suspended in water containing TEMPO and sodium bromide. The TEMPO-mediated ...
Get Price2012-12-24 · Polymerization of cationic monomers and chemical reactions of polymers are two popular ways to produce cationic polymers. The second method can be further divided into two different cationic modifications based on synthetic polymers (e.g., polyacrylamide) [8,9] and natural polymers (e.g. starch, cellulose, chitin, lignose), respectively.
Get Price2021-5-25 · Table1 [21]. Cationic polyacrylamide (CPAM) with a molecular weight ranging from 8 mil-lion to 18 million Da and ionization degree of 25% was obtained commercially (Shenghuang Chemical Products Co., Ltd., Liaocheng, Shandong, China). Table 1. Properties of calcium lignosulfonate. Mw (g/mol) 18,000 Mn (g/mol) 2500 pH 2.0–4.0 Insoluble (%) 1.5 max
Get PricePolyacrylamide abbreviated as PAM, is a linear polymer which is one of the most widely used varieties of water-soluble polymer compounds. Polyacrylamide and its derivatives can be used as effective flocculants, thickeners, paper enhancers and liquid drag reducers, etc., widely used in water treatment, paper making, petroleum, coal, mining and metallurgy, geology, textile Industrial sectors ...
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