Adsorption Kinetics of a Novel Organic–Inorganic Hybrid Polymer on Silica and Alumina Studied by Quartz Crystal Microbalance

Water soluble polymer flocculants are important constituents of solid–liquid separation units for the treatment of a variety of process‐affected effluents. The systematic development of a flocculant relies on a good understanding of flocculation process, polymer synthesis, polymer characterization, and, not the least, flocculation performance assessment as desired for a particular treatment process, all of which are essential to establish meaningful relationships between flocculant microstructure and flocculation efficiency. The aim of this article is to communicate the bigger picture of this research area to the readers. The recent advances in the application of bio/natural, synthetic, and stimuli‐responsive flocculants are reviewed. Then, the basic polymer reaction engineering tools to control the microstructure of flocculants are provided and the techniques for the quantification of flocculant microstructure are concisely discussed. This is followed by a review of the methods used for the characterization of particle‐polymer force measurement, and flocculation/dewatering assessment with attention to the characterization of aggregate structures.

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“…More detailed description of using SFA and AFM can be found elsewhere

F = k x

A number of studies on the interactions between particles and polymer flocculants with SFA and AFM are available . For example, Wang et al .…”

Section: Performance Assessment Of Flocculantsmentioning

confidence: 99%

“…Alagha et al . used AFM imaging under tapping mode in the air to investigate the adsorption of an organic–inorganic hybrid polymer, Al(OH) 3 polyacrylamide (Al‐PAM), on silica and alumina.…”

Section: Performance Assessment Of Flocculantsmentioning

confidence: 99%

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Vajihinejad

Gumfekar

Bazoubandi

et al. 2018

Macro Materials & Eng

141

108

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“…[31][32][33][34][35][36][37][38] The basic principle of the technique relies on monitoring the resonance frequency and dissipation of a piezoelectric quartz crystal sensor. The application of QCM-D as an ultrasensitive mass balance originates from the work of Sauerbrey, 39 who established an empirical relationship between the added (deposited) mass to the sensor and the resonance frequency shift of the sensor given by Eq.…”

Section: Qcm-d Measurement Principlementioning

confidence: 99%

Role of Caustic Addition in Bitumen–Clay Interactions

et al. 2015

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Coating of bitumen by clays, known as slime coating is detrimental to bitumen recovery from oil sands using the warm slurry extraction process. Sodium hydroxide (caustic) is added to the extraction process to balance many competing processing challenges which include undesirable slime coating. The current research aims at understanding the role of caustic addition in controlling interactions of bitumen with various types of model clays. The interaction potential was studied by quartz crystal microbalance with dissipation monitoring (QCM-D). After confirming the slime coating potential of montmorillonite clays on bitumen in the presence of calcium ions, interaction of kaolinite and illite with bitumen was studied. To make our study more closely related to industrial applications, tailings water from bitumen extraction tests using Denver flotation cell at different caustic additions was used. At caustic dosage up to 0.5 wt.% of oil sands ore, a negligible coating of kaolinite on the bitumen was determined. However, at lower level of caustic addition illite was shown to attach to the bitumen, with the interaction potential decreasing with increasing caustic dosage. Increasing concentration of humic acids as a result of increasing caustic dosage was identified to limit the interaction potential of illite with bitumen.2 This fundamental study clearly shows that the critical role of caustics in modulating interactions of clays with bitumen depends on the type of clays, guiding the multi-billion dollar oil sands industry to identify clay type as a key operational variable.

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“…The hybrid polyacrylamide Al-PAM was synthesized in-house according to a procedure described elsewhere [14]. Al-PAM was synthesized by the polymerization of acrylamide monomers in an Al(OH) 3 …”

Section: Synthesis Of Al(oh)3-polyacrylamide (Al-pam)mentioning

confidence: 99%

Ash Depression in Fine Coal Flotation Using a Novel Polymer Aid

Molatlhegi¹,

Alagha²

2016

IJCCE

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The current study investigated the effects of novel hybrid polyacrylamide polymers as ash (slime) depressants in fine coal flotation to enhance combustible recovery and ash rejection. Coal samples at P 80 of approximately 45 um with ~25% ash content were floated in the presence of in-house synthesized hybrid aluminum hydroxide polyacrylamide polymers (Al(OH) 3 -PAM, or Al-PAM). All flotation experiments were carried out in a 5-L Denver flotation cell. Various influencing factors were examined to optimize the flotation process in the presence of the Al-PAM polymers, including the Al-PAM dosage, Al-PAM conditioning time, impeller rotation speed and pulp pH. Comparative and synergistic studies were also performed using organic polyacrylamide polymers (PAMs), commercial dispersants and Al-PAM/dispersant system. Results showed a significant improvement in both combustible recovery and ash rejection at an Al-PAM dosage of 0.25 mg/L. The maximum combustible recovery obtained, at natural pH, with Al-PAM and Al-PAM/dispersant system was determined to be 70% and 66% at ash content of 7.74% and 7.4%, respectively. Zeta potential values of both the raw coal and concentrate products showed a large shift toward more positive values (from −50 mV to −13 mV), indicating a significant decrease in ash-forming minerals (slimes) when Al-PAM polymers were applied.

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Adsorption Kinetics of a Novel Organic–Inorganic Hybrid Polymer on Silica and Alumina Studied by Quartz Crystal Microbalance

Cited by 86 publications

References 31 publications

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Water Soluble Polymer Flocculants: Synthesis, Characterization, and Performance Assessment

Role of Caustic Addition in Bitumen–Clay Interactions

Ash Depression in Fine Coal Flotation Using a Novel Polymer Aid

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