PAPER PRESENTATION - Sritama Mukherjee 27.08.2016 Membrane for - - PowerPoint PPT Presentation

• Sritama Mukherjee 27.08.2016

PAPER PRESENTATION

Membrane for UNIVERSAL water purifjcation?

 Prevalent techniques:

 Chemical precipitation- ~99% effjciency,

causes secondary pollution, expensive, treats high contamination.

 Sorbents and Ion Exchange resins- 60-90%

effjciency, costly, treat small volume waste water, secondary pollution

 Floatation or electrochemical treatment of

waste water

 Membrane purifjcation- ~99% effjciency

but high intrinsic costs, membrane fouling, limiting feed fmows

SPECIFICTY!!

The background Science involved…

 Rufo and colleagues suggested that amyloid-forming peptides have

a binding capability for zinc metal ions, which can catalyse fjbril formation.

 It has also been proposed that the toxicity of protein aggregates is

due to binding of heavy metal ions to the peptides.

So, what they did is..

 Hybrid membrane development  amyloid fjbrils and activated Carbon  Waste water purifjcation (heavy metal and nuclear

waste)

 Simultaneous ion removal mode  β-Lactoglobulin  cheap edible milk protein  amyloid fjbrils  vacuum fjltration method.  Sticky and stifg-enable assembly of amyloid fjbrils with

carbon-based materials

 Mechanically strong composite membranes

Schematically,

Heavy metal pollutants stud (KAu(CN)2), (HgCl2), (Pb(C2H3O2)4) a (Na2PdCl4)

Results and discussion:

50mL, 0.1L/min, 1.8 cm2 area

Cont d.

Highlights:

10 × 50 mL = 0.5 L volume of water

contaminated by mercury was processed using a 77 mg membrane containing only 7.4 wt% protein, that is, 5.7 mg, nearly 90,000 times less than the quantity of processed contaminated

• water. By extrapolating, 1 kg of protein could be

used to treat 90,000 L of contaminated water. Fitting Parameters to fjt Metal adsorption isotherm

Recovery: Pollutant to valuable material

Summary:

 Development of a hybrid composite membrane

incorporating inexpensive and environmentally friendly β-lactoglobulin amyloid fibrils and activated carbon, and show that it can be used as a tool for the effjcient removal of heavy metal ion pollutants and radioactive waste from water.

 Demonstrated the case of expensive metal

pollutants, the recovered ions can even be converted into valuable materials, turning a global risk challenge into a unique opportunity.

Characterization

Band gap=1.55 eV

FLV-MoS2 disinfection performance

Summary:

 Effjcient harvesting of visible light for photocatalytic water

disinfection with a novel material, FLV-MoS2.

 By decreasing the domain size, the band gap of MoS2 was

increased from 1.3 eV (bulk material) to 1.55 eV (FLV- MoS2).

 This enabled the FLV-MoS2 to generate ROS successfully for

bacteria inactivation in water. The FLV-MoS2 showed a faster disinfection than the most-studied photocatalyst, TiO2.

 With the additional deposition of Cu or Au to assist

electron–hole pair separation and also to catalyse the ROS production reactions, FLV-MoS2 showed a rapid inactivation

• f >99.999% bacteria in only 20 or 60 min, respectively.

What can be done..

• Our material is specifjc towards Arsenic. Can we achieve

multiple ion trapping by incorporating some cheap fjbrils to

• ur composite?
• Also, our material has no light sensitivity, so our material

can be given visible light disinfection property, apart from Ag disinfection.

Thank You.