Study on dynamic adsorption characteristics of broken coal gangue to heavy metal ions under leaching condition and its cleaner mechanism to mine water

2021 ◽  
pp. 129756
Author(s):  
Junmeng Li ◽  
Yanli Huang ◽  
Wei Li ◽  
Yachao Guo ◽  
Shenyang Ouyang ◽  
...  
Author(s):  
A. SH. BUKUNOVA ◽  
◽  
G. ZH. TURSBEKOVA ◽  
L. B. IRISKINA ◽  
M. K. ZHAMANBAEVA ◽  
...  

This paper presents the results of studies on the use of bentonite from the Taganskoye field for purification of mine water from the mining industry from heavy metal ions (MI). It has been established that the use of the thermo-acid-activated form of bentonite clay allows the removal of MI Cu2+, Pb2+, Cd2+, Zn2+ions from mine water by 99.6, 94.7, 98.9, 99.5 %, respectively, which ensures that the maximum permissible concentration of fishery is achieved at selected optimal conditions that were identified on the basis of an active experiment. A comparative analysis of the presented results of mass spectrometry and scanning electron microscopy shows that they are valid and do not contradict the obtained experimental data on the composition of exchange cations and structural characteristics in ultrafine mineral phases of bentonite clay samples of natural and thermo-acid activated forms It has been established that during acid activation of bentonite clays, the structure of montmorillonite is retained upon extraction of up to 80 % of magnesium, iron, and aluminum ions and is destroyed only upon their almost complete extraction.


2020 ◽  
Vol 99 ◽  
pp. 106072 ◽  
Author(s):  
Lihua Liu ◽  
Siyan Liu ◽  
Hongliang Peng ◽  
Zhengchi Yang ◽  
Lu Zhao ◽  
...  

2012 ◽  
Vol 83 (15) ◽  
pp. 1574-1586 ◽  
Author(s):  
Annalisa Aluigi ◽  
Alessandro Corbellini ◽  
Fabio Rombaldoni ◽  
Giorgio Mazzuchetti

2009 ◽  
Vol 28 (2) ◽  
pp. 158-164 ◽  
Author(s):  
Hyeon-Yong Lee ◽  
Choong Jeon ◽  
Kyoung-Jae Lim ◽  
Ki-Chan Hong ◽  
Jung-Eun Lim ◽  
...  

2018 ◽  
Vol 6 (5) ◽  
pp. 6965-6973 ◽  
Author(s):  
Yaqing Duan ◽  
Auriane Freyburger ◽  
Werner Kunz ◽  
Cordt Zollfrank

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104754-104762 ◽  
Author(s):  
Ming-Tsung Wu ◽  
Yen-Ling Tsai ◽  
Chih-Wei Chiu ◽  
Chih-Chia Cheng

A novel crosslinking modification of β-chitosan and successfully analyzed its fast adsorption characteristics for different heavy metal ions in highly acidic environments.


Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 112
Author(s):  
Kayee Chan ◽  
Kohki Morikawa ◽  
Nobuyuki Shibata ◽  
Anatoly Zinchenko

DNA–chitosan (DNA–CS) hydrogel was prepared by in situ complexation between oppositely charged DNA and chitosan polyelectrolytes via electrostatic cross-linking to study its adsorption characteristics. The DNA–chitosan hydrogel matrix contains (i) cationic (NH3+) and anionic (PO4–) sites for electrostatic binding with ionic species, (ii) -OH and -NH2 groups and heteroaromatic DNA nucleobases for chelation of heavy metal ions, and (iii) DNA double-helix for recognition and binding to small organic molecules of various structures and polarities. DNA–CS hydrogels efficiently bind with Hg2+, Pb2+, Cd2+, and Cu2+ metal cations of significant environmental concern. Adsorption capacities of DNA–CS hydrogels for studied metal ions depend on hydrogel composition and pH of solution and reach ca. 50 mg/g at neutral pHs. Hydrogels with higher DNA contents show better adsorption characteristics and notably higher adsorption capacity to Hg2+ ions. Because of the co-existence of cationic and anionic macromolecules in the DNA–CS hydrogel, it demonstrates an affinity to both anionic (Congo Red) and cationic (Methylene Blue) dyes with moderate adsorption capacities of 12.6 mg/g and 29.0 mg/g, respectively. DNA–CS hydrogel can also be used for adsorptive removal of pharmaceuticals on conditions that their molecules are sufficiently hydrophobic and have ionogenic group(s). Facile preparation and multitarget adsorption characteristics of DNA–CS hydrogel coupled with sustainable and environmentally friendly characteristics render this system promising for environmental cleaning applications.


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