Synergistic effects of chromium(VI) reduction/EDTA oxidization for PCB wastewater by photocatalysis combining ionic exchange membrane processes

Abstract Proton exchange membrane fuel cell converts hydrogen and oxygen into electricity with zero emission1. The high cost and low durability of Pt-based electrocatalysts for oxygen reduction reaction hinder its wide applications2,3. The development of non-precious metal electrocatalysts also reaches the bottleneck because of the low activity and durability4,5. Here we rationally design a hybrid electrocatalyst consisting of atomically dispersed Pt and Fe single atoms and intermetallic PtFe alloy nanoparticles. The Pt mass activity of the hybrid catalyst is 3.5 times higher than that of commercial Pt/C in a fuel cell. More importantly, the fuel cell with an ultra-low Pt loading in the cathode (0.015 mgPt cm-2) shows unprecedented durability, with 93.6% activity retention after 100,000 cycles and no noticeable current drop at 0.6 V for at least 206 h. These results highlight the importance of the synergistic effects among active sites in hybrid electrocatalysts and provide an alternative way to design more active and durable low-Pt electrocatalysts for electrochemical devices.

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Pressure-driven membrane processes for boron and arsenic removal: pH and synergistic effects

Desalination ◽

10.1016/j.desal.2021.115441 ◽

2022 ◽

Vol 522 ◽

pp. 115441

Author(s):

Aina Orell Regis ◽

Johan Vanneste ◽

Sarah Acker ◽

Gisella Martínez ◽

Juana Ticona ◽

...

Keyword(s):

Arsenic Removal ◽

Synergistic Effects ◽

Membrane Processes ◽

Pressure Driven

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Ion-Exchange membrane processes for clean industrial chemistry

Chemical Engineering & Technology ◽

10.1002/ceat.270200405 ◽

1997 ◽

Vol 20 (4) ◽

pp. 247-258 ◽

Cited By ~ 26

Author(s):

R. Audinos

Keyword(s):

Ion Exchange ◽

Ion Exchange Membrane ◽

Industrial Chemistry ◽

Membrane Processes ◽

Exchange Membrane

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A Novel Ionic Exchange Membrane Crystallizer to Recover Magnesium Hydroxide from Seawater and Industrial Brines

Membranes ◽

10.3390/membranes10110303 ◽

2020 ◽

Vol 10 (11) ◽

pp. 303

Author(s):

Daniele La Corte ◽

Fabrizio Vassallo ◽

Andrea Cipollina ◽

Marian Turek ◽

Alessandro Tamburini ◽

...

Keyword(s):

Magnesium Hydroxide ◽

Saline Solution ◽

Low Cost ◽

Feed Solution ◽

Ionic Exchange ◽

The North ◽

Novel Technology ◽

Co Precipitation ◽

Exchange Membrane ◽

By Products

A novel technology, the ion exchange membrane crystallizer (CrIEM), that combines reactive and membrane crystallization, was investigated in order to recover high purity magnesium hydroxide from multi-component artificial and natural solutions. In particular, in a CrIEM reactor, the presence of an anion exchange membrane (AEM), which separates two-compartment containing a saline solution and an alkaline solution, allows the passage of hydroxyl ions from the alkaline to the saline solution compartment, where crystallization of magnesium hydroxide occurs, yet avoiding a direct mixing between the solutions feeding the reactor. This enables the use of low-cost reactants (e.g., Ca(OH)2) without the risk of co-precipitation of by-products and contamination of the final crystals. An experimental campaign was carried out treating two types of feed solution, namely: (1) a waste industrial brine from the Bolesław Śmiały coal mine in Łaziska Górne (Poland) and (2) Mediterranean seawater, collected from the North Sicilian coast (Italy). The CrIEM was tested in a feed and bleed modality in order to operate in a continuous mode. The Mg2+ concentration in the feed solutions ranges from 0.7 to 3.2 g/L. Magnesium recovery efficiencies from 89 up to 100% were reached, while magnesium hydroxide purity between 94% and 98.8% was obtained.

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