Effect of electrolytes on interactions between a novel organic-inorganic hybrid polymer flocculant and kaolinite particles

Xiong，Yong1; Chen，Qian1; Cao，Tiantian1,4; Chang，Jing3; Xu，Shengming1; Xu，Zhenghe2,3

2020-04-05

10.1016/j.colsurfa.2019.124391

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   影响因子和分区

0927-7757

1873-4359

A novel copolymer, Al(OH)-poly[N-isopropylacrylamide-co-N-[3-(Dimethylamino)propyl]methacrylamide] polyacrylamide (Al(OH)-p[NIPAM-co-PMADMA]) was synthesized and characterized. The flocculation behavior of fine kaolinite by the temperature-responsive copolymer in different electrolyte solutions was studied by settling tests, measurements of lower critical solution temperature (LCST) and dissipative quartz crystal microbalance (QCM-D). The solution salinity and the type of electrolytes were shown to play a critical role in controlling the interactions between the synthesized flocculants and kaolinite particles. The initial settling rate (ISR) of kaolinite suspension increased initially and then decreased with further increasing the electrolyte concentration of NaCl, CaCl, NaHPO or NaCO. At low electrolyte concentrations, the electrolyte addition increased the adsorption of polymer on kaolinite particles. The effect of electrolyte addition on kaolinite flocculation followed the trend of NaCO＞CaCl＞NaHPO＞NaCl, which can be described by the classical DLVO theory. However, the higher concentration of electrolytes led to a weaker adsorption and more compressed conformations of Al(OH)-p[NIPAM-co-PMADMA] chains on both silica and alumina surfaces which mimic two types of kaolinite basal planes. The salting-out effect was found to be an important reason for polymer phase transfer, which inhibited the flocculation performance at higher electrolyte concentrations.

Electrolytes Flocculation Kaolinite QCM-D Temperature responsive copolymer

SCI ; EI

英语

通讯

Leading Talents Program of Guangdong Province[K17253301] ; National Natural Science Foundation of China[51274129]

Chemistry

Chemistry, Physical

WOS:000513862500002

Elsevier B.V.

20200408085406

Acrylic monomers ; Alumina ; Aluminum oxide ; Amides ; Electrolytes ; Flocculation ; Kaolinite ; organic-inorganic materials ; Ostwald ripening ; Quartz crystal microbalances ; Silica ; Sodium Carbonate ; Sodium chloride ; Suspensions (fluids)

Minerals:482.2 ; Chemical Operations:802.3 ; Chemical Products Generally:804 ; Organic Polymers:815.1.1 ; Special Purpose Instruments:943.3

CHEMISTRY

2-s2.0-85078088142

Scopus

1.Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing,100084,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Chemical and Materials Engineering,University of Alberta,Edmonton,T6G 2V4,Canada
4.SINOPEC Research Institute of Petroleum Processing,Beijing,100083,China

Xiong，Yong,Chen，Qian,Cao，Tiantian,et al. Effect of electrolytes on interactions between a novel organic-inorganic hybrid polymer flocculant and kaolinite particles[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2020,590.

Xiong，Yong,Chen，Qian,Cao，Tiantian,Chang，Jing,Xu，Shengming,&Xu，Zhenghe.(2020).Effect of electrolytes on interactions between a novel organic-inorganic hybrid polymer flocculant and kaolinite particles.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,590.

Xiong，Yong,et al."Effect of electrolytes on interactions between a novel organic-inorganic hybrid polymer flocculant and kaolinite particles".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 590(2020).