PMID- 31173994
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20190812
IS  - 1095-7103 (Electronic)
IS  - 0021-9797 (Linking)
VI  - 552
DP  - 2019 Sep 15
TI  - Adsorption characteristics and mechanisms of O-Carboxymethyl chitosan on 
      chalcopyrite and molybdenite.
PG  - 659-670
LID - S0021-9797(19)30561-2 [pii]
LID - 10.1016/j.jcis.2019.05.023 [doi]
AB  - O-Carboxymethyl chitosan (O-CMC), a nontoxic and biodegradable derivative of the 
      natural polysaccharide-chitosan, was recently found to be a viable alternative 
      for the toxic depressants used in the flotation separation of chalcopyrite and 
      molybdenite. In this work, the adsorption characteristics of O-CMC on 
      molybdenite/chalcopyrite surfaces and the associated interaction mechanisms were 
      investigated by electrokinetic study, infrared spectroscopy, Atomic force 
      microscopy (AFM) imaging, X-ray photoelectron spectroscopy (XPS) and 
      Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). The experimental 
      results demonstrated that O-CMC adsorbed on both mineral surfaces. However, the 
      interactions between O-CMC and chalcopyrite are mostly weak physical interactions 
      such as electrostatic interaction, and most of the adsorbed O-CMC molecules can 
      be removed mechanically (e.g., washing) or displaced by xanthate. In comparison, 
      the adsorption of O-CMC on molybdenite is dictated by hydrophobic interaction and 
      electrostatic interaction, and is barely affected by rinsing or xanthate 
      addition. As a result, the strong adsorption of O-CMC on molybdenite over the 
      chalcopyrite lead to the depression of molybdenite and selective separation of 
      two minerals in flotation. In addition, infrared spectroscopy and XPS revealed 
      that no strong chemical interactions were involved during the adsorption O-CMC on 
      molybdenite and chalcopyrite surfaces.
CI  - Copyright (c) 2019 Elsevier Inc. All rights reserved.
FAU - Yuan, Duowei
AU  - Yuan D
AD  - Department of Chemical and Materials Engineering, University of Alberta, 
      Edmonton, Alberta T6G 1H9, Canada. Electronic address: duowei@ualberta.ca.
FAU - Cadien, Ken
AU  - Cadien K
AD  - Department of Chemical and Materials Engineering, University of Alberta, 
      Edmonton, Alberta T6G 1H9, Canada. Electronic address: kcadien@ualberta.ca.
FAU - Liu, Qi
AU  - Liu Q
AD  - Department of Chemical and Materials Engineering, University of Alberta, 
      Edmonton, Alberta T6G 1H9, Canada. Electronic address: qi.liu@ualberta.ca.
FAU - Zeng, Hongbo
AU  - Zeng H
AD  - Department of Chemical and Materials Engineering, University of Alberta, 
      Edmonton, Alberta T6G 1H9, Canada. Electronic address: hongbo.zeng@ualberta.ca.
LA  - eng
PT  - Journal Article
DEP - 20190506
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
SB  - IM
OTO - NOTNLM
OT  - Adsorption
OT  - Carboxymethyl chitosan
OT  - Chalcopyrite
OT  - Depressant
OT  - Electrostatic interaction
OT  - Flotation
OT  - Hydrophobic interaction
OT  - Molybdenite
OT  - Separation
EDAT- 2019/06/08 06:00
MHDA- 2019/06/08 06:01
CRDT- 2019/06/08 06:00
PHST- 2019/02/12 00:00 [received]
PHST- 2019/04/23 00:00 [revised]
PHST- 2019/05/05 00:00 [accepted]
PHST- 2019/06/08 06:00 [pubmed]
PHST- 2019/06/08 06:01 [medline]
PHST- 2019/06/08 06:00 [entrez]
AID - S0021-9797(19)30561-2 [pii]
AID - 10.1016/j.jcis.2019.05.023 [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2019 Sep 15;552:659-670. doi: 
      10.1016/j.jcis.2019.05.023. Epub 2019 May 6.