scholarly journals Extraction and Recovery of Mercury and Lead from Aqueous Waste Streams using Redox-Active Layered Materials

1999 ◽  
Author(s):  
P K Dorhout ◽  
S H Strauss
Keyword(s):  
Layered Materials ◽  
Waste Streams ◽  
Redox Active ◽  
Aqueous Waste

scholarly journals Innovative BPPO Anion Exchange Membranes Formulation Using Diffusion Dialysis-Enhanced Acid Regeneration System

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 311
Author(s):  
Muhammad Imran Khan ◽  
Majeda Khraisheh ◽  
Fares AlMomani
Keyword(s):  
Anion Exchange ◽  
Room Temperature ◽  
Feed Solution ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Regeneration System ◽  
Waste Streams ◽  
Acid Recovery ◽  
Aqueous Waste ◽  
Diffusion Dialysis

Recycling of acid from aqueous waste streams is crucial not only from the environmental point of view but also for maturing the feasible method (diffusion dialysis). Anion exchange membrane (AEM)–based diffusion dialysis process is one of the beneficial ways to recover acid from aqueous waste streams. In this article, the synthesis of a series of brominated poly (2, 6–dimethyl-1, 4–phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) through quaternization with triphenylphosphine (TPP) were reported for acid recovery via diffusion dialysis process. The successful synthesis of the prepared membranes was confirmed by Fourier transform infrared (FTIR) spectroscopy. The as-synthesized anion exchange membranes represented water uptake (WR) of 44 to 66%, ion exchange capacity of (IEC) of 1.22 to 1.86 mmol/g, and linear swelling ratio (LSR) of 8 to 20%. They exhibited excellent thermal, mechanical, and acid stability. They showed homogeneous morphology. The acid recovery performance of the synthesized AEMs was investigated in a two compartment stack using simulated mixture of HCl and FeCl2 as feed solution at room temperature. For the synthesized anion exchange membranes TPP–43 to TPP–100, the diffusion dialysis coefficient of acid (UH+) was in the range of 6.7 to 26.3 (10−3 m/h) whereas separation factor (S) was in the range of 27 to 49 at 25 °C. Obtained results revealed that diffusion dialysis performance of the synthesized AEMs was higher than the commercial membrane DF–120B (UH+ = 0.004 m/h, S = 24.3) at room temperature. It showed that the prepared AEMs here could be excellent candidates for the diffusion dialysis process.

Coals as sorbents for the removal and reduction of hexavalent chromium from aqueous waste streams

Fuel ◽  
2002 ◽  
Vol 81 (5) ◽  
pp. 691-698 ◽  
Author(s):  
J. Lakatos ◽  
S.D. Brown ◽  
C.E. Snape
Keyword(s):  
Hexavalent Chromium ◽  
Waste Streams ◽  
Aqueous Waste

Selective sodium removal from aqueous waste streams with NaSicon ceramics

1999 ◽  
Vol 15 (3) ◽  
pp. 231-237 ◽  
Author(s):  
S Balagopal ◽  
T Landro ◽  
S Zecevic ◽  
D Sutija ◽  
S Elangovan ◽  
...  
Keyword(s):  
Waste Streams ◽  
Sodium Removal ◽  
Aqueous Waste

Comparative analysis of ZVI materials for reductive separation of 99Tc(VII) from aqueous waste streams

2019 ◽  
Vol 380 ◽  
pp. 120836 ◽  
Author(s):  
Daria Boglaienko ◽  
Hilary P. Emerson ◽  
Yelena P. Katsenovich ◽  
Tatiana G. Levitskaia
Keyword(s):  
Comparative Analysis ◽  
Waste Streams ◽  
Aqueous Waste
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