scholarly journals Synthesis of self-assembled hierarchical AlPO-34 microspheres by using an ionic liquid and its application in heavy metal removal

2021 ◽  
Vol 8 (4) ◽  
Author(s):  
Liang Zhou ◽  
Hongjian Li ◽  
Runlin Han
Keyword(s):  
Heavy Metal ◽  
Ionic Liquid ◽  
Molecular Sieves ◽  
Treatment Process ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Channel Network ◽  
Structure Directing Agent ◽  
Heavy Metal Cations ◽  
Post Treatment Process

Hierarchical AlPO-34 molecular sieves microspheres were synthesized in a [BMIm]Br ionic liquid without template or complex post-treatment process. The formation mechanism of such framework structures and their morphology were investigated. [BMIm]Br was proven to serve as both solvent and sole provider of the structure directing agent. The organic amine in the compound affects the framework density of the crystals and promotes the formation of a chabazite (CHA) type framework. After ageing for 1 h the AlPO-34 microspheres are formed due to the aggregation properties of the ionic liquid. The hierarchical mirosphere has a relatively high Brunauer–Emmett–Teller surface area and a considerably uniform mesoporous channel network. The hierarchical AlPO-34 microspheres were used as absorbers of heavy metal cations and showed a higher loading capacity and distribution coefficient compared with the AlPO-34-NH.

A review on nanofibers membrane with amino-based ionic liquid for heavy metal removal

2020 ◽  
Vol 297 ◽  
pp. 111793 ◽  
Author(s):  
Choi Yee Foong ◽  
Mohd Dzul Hakim Wirzal ◽  
Mohamad Azmi Bustam
Keyword(s):  
Heavy Metal ◽  
Ionic Liquid ◽  
Metal Removal ◽  
Heavy Metal Removal

Chelating Resin versus Ion-Exchange Resin for Heavy Metal Removal in Toxicity Fractionation

1992 ◽  
Vol 26 (1-2) ◽  
pp. 189-196 ◽  
Author(s):  
C. N. Mazidji ◽  
B. Koopman ◽  
G. Bitton
Keyword(s):  
Heavy Metal ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Complete Removal ◽  
Ion Exchange Resin ◽  
Chelating Resin ◽  
Heavy Metal Cations ◽  
Removal Of Heavy Metals

A chelating resin (Chelex 50-100) and ion-exchange resin (Dowex 50W-X8) were evaluated for removal of heavy metals in toxicity fractionation. Microtox and β-galactosidase activity were employed as toxicity endpoints. The resins were packed into 4 raL glass Pasteur pipettes for use. Chelating resin provided complete removal of toxicity due to polyvalent heavy metal cations (Cd, Cu, Hg, Pb, Zn). Ion-exchange resin was ineffective in removing mercury toxicity. Neither resin provided complete removal of Ag+ toxicity. Toxicity of organic compounds was, at most, partially removed. Performance of the ion-exchange and chelating resins was insensitive to hardness and pH. Based on these results, chelating resin is recommended for heavy metal removal as part of a toxicity fractionation procedure.

Heavy Metal Removal Using Bound Macrocycles

1991 ◽  
Vol 23 (1-3) ◽  
pp. 301-308 ◽  
Author(s):  
R. M. Izatt ◽  
R. L. Bruening ◽  
M. B. Borup
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Removal ◽  
Equilibrium Constants ◽  
Heavy Metal Removal ◽  
Pilot Scale ◽  
Heavy Metal Cations ◽  
Gel Beads ◽  
Removal Of Heavy Metals ◽  
Alkaline Earth Cations

Aza macrocycles bound to silica gel beads were found to selectively remove heavy metal cations such as Pb2+, Cd2+, Ag+, and Hg2+ from aqueous solutions. These bound macrocycles have a virtually infinite selectivity of binding with heavy metals over alkali and alkaline earth cations. The material is very stable and can be reused hundreds of times. Columns may be regenerated using an acidic eluent solution. Equilibrium constants were determined by column tests. Removal of heavy metals was demonstrated in bench scale tests using a synthetic contaminated water and in pilot scale tests using a naturally contaminated river water. Heavy metal concentrations could be effectively reduced to the µg/L level using the process.

Heavy metal removal from stormwater runoff by sorption

2019 ◽  
pp. 207-217
Author(s):  
Hulya Genr-Fuhrman ◽  
Peter S. Mikkelsen ◽  
Anna Ledin
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
High Surface ◽  
Heavy Metal Removal ◽  
High Surface Area ◽  
The Other ◽  
Heavy Metal Cations ◽  
Batch Tests ◽  
Coated Sand ◽  
Granulated Activated Carbon

In this study, several sorbents (i.e. alumina, activated bauxsol coated sand (ABCS), bark,bauxsol coated sand (BCS), fly ash (FA), granulated activated carbon (GAC), iron oxidecoated sand (IOCS), natural zeolite (NZ), sand, and spine!) are investigated with the longterm goal of developing a feasible technology for heavy metal removal during secondarytreatment of storm water. The sorbents are tested in batch tests for their As, Cd, Cr, Cu, Ni andZn removal efficiency from synthetic stormwater samples, where all of these metals coexisted at a starting pH of 6.5. It is found that each sorbent has different affinity to the heavymetals, with heavy metal cations (i.e. Cd, Cu, Ni and Zn) removed more effectively thanheavy metal anions (i.e. As and Cr) by all sorbents except IOCS, which has a high affinitytowards As. The results further indicated that alumina and BCS outperform the other sorbents,possibly due to high surface area of alumina and the favourable sorption sites of BCS;whereas NZ, sand and bark were the least efficient. On the other hand, although FAeffectively retained Cd, Ni and Zn, the leaching of As, Cr, and Cu is a concern.

Research trends of heavy metal removal from aqueous environments

2021 ◽  
Vol 287 ◽  
pp. 112322
Author(s):  
Morteza Nazaripour ◽  
Mir Amir Mohammad Reshadi ◽  
Seyed Ahmad Mirbagheri ◽  
Mehdi Nazaripour ◽  
Alireza Bazargan
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Research Trends ◽  
Aqueous Environments
Sign in / Sign up

Export Citation Format

Share Document