Effect of N-substituents on performance of thiourea collectors by density functional theory calculations
Using density functional methods,some properties were studied such as the energies and compositions of frontier molecular orbitals and the atomic charges,which are related to the reactive behavior of thioureas containing different N-substituent groupings.The calculation results indicate that the N-s...
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Published in | Transactions of Nonferrous Metals Society of China Vol. 20; no. 4; pp. 695 - 701 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.04.2010
Institute of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China |
Subjects | |
Online Access | Get full text |
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Summary: | Using density functional methods,some properties were studied such as the energies and compositions of frontier molecular orbitals and the atomic charges,which are related to the reactive behavior of thioureas containing different N-substituent groupings.The calculation results indicate that the N-substituent groupings have significant effect on the flotation performance of thiourea collectors.The order of electron-donating ability is N-propyl-N'-benzyl-thiourea(PBZYTU)〉N-propyl-N'-ethyl-thiourea (PETU)〉N-propyl-N'-allyl-thiourea(PALTU)〉〉N-propyl-N'-acetyl-thiourea(PACTU)〉N-propyl-N'-ethoxycarbonyl-thiourea (PECTU)〉N-propyl-N'-benzoyl-thiourea(PBZOYTU),and the order of feedback-electron-accepting ability is PBZOYTU〉 PACTU〉PECTU〉〉PALTU〉PETU〉PBZYTU.This implies that PBZOYTU,PACTU or PECTU can react with copper atoms having(t2g) 6 (eg) 3Cu(II)or t 6e 4Cu(I)configuration on the surfaces of copper sulfide minerals through normal covalent bond and back donation covalent bond,and exhibit excellently collecting performance for copper sulfide minerals.These are consistent with the experimental data reported in the literatures. |
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Bibliography: | TG146 43-1239/TG sulfide ore thiourea collector structure-activity relationship density functional method thiourea collector; sulfide ore; structure-activity relationship; density functional method ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1003-6326 |
DOI: | 10.1016/S1003-6326(09)60200-4 |