Removal of lead from waste water using nanoscale MoS2

Patent metadata

Field	Value
Publication number	US-11471854-B2
Application number	US-201816771635-A
Country	US
Kind code	B2
Filing date	Dec 5, 2018
Priority date	Dec 11, 2017
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

The process of reacting nanoscale ce-MoS 2 nanosheets anchored on oxide support with lead in solution at room temperature whereby the reaction is rapid and spontaneous resulting in the formation of PbMoO 4-x S x in the process of scavenging Pb 2+ and Pb 4+ present in the solution.

First claim

We claim:

1. A process for scavenging lead (Pb) species from a solution, comprising—reacting nanoscale chemically exfoliated molybdenum disulfide (ce-MoS 2 ) nanosheets anchored on oxide supports with lead in solution at room temperature to obtain a reaction, whereby the reaction is rapid and spontaneous in a basic medium and results in formation of PbMoO 4-x S x , and thereby scavenging the lead species as either or both of Pb 2+ and Pb 4+ -from the solution.

2. The process of claim 1 , wherein the ce-MoS 2 nanosheets have a size up to 1 μm in length and a thickness of 1-3 layers.

3. The process of claim 1 , wherein the lead in solution is in a Pb 2+ and Pb 4+ state.

4. The process of claim 1 , wherein the solution comprises one or more anions as counter ions for Pb 2+ and Pb 4+ , said anions being selected from CH 3 CO 2− , Cl—, NO 3 2− , SO 4 2− , and O 2− .

5. The process of claim 1 , wherein the ce-MoS 2 nanosheets are supported on oxide and polymeric substrates that comprise one or more of SiO 2 , Al 2 O 3 , polystyrene and polyvinyl chloride.

6. The process of claim 1 , wherein the supported ce-MoS2 nanosheets comprise a filter in a filtering device to remove lead (Pb) species from the solution, the filtering device comprising at least one format selected from a candle, a molded porous block, a filter bed, a column, packets and bags.

7. The process of claim 1 wherein the solution is selected from an aqueous solution and a non aqueous solution.

8. The process of claim 1 , wherein the solution comprises air and the lead species is present in the air, in suspended form.

9. The process of claim 1 , wherein ce-MoS 2 reacts with either or both of Pb 2+ and Pb 4+ .

10. A process—for scavenging a heavy metal species from a solution, comprising—reacting—nanoscale chemically exfoliated molybdenum disulfide (ce-MoS 2 ) nanosheets anchored on oxide supports with a heavy metal in solution at room temperature to obtain a reaction, whereby the reaction is rapid and spontaneous in a basic medium and results in formation of a heavy metal-MoO 4-x S x , and thereby scavenging the heavy metal species from the solution, wherein the heavy metal comprises at least one of lead, arsenic, cadmium, mercury and chromium.

Assignees

• Indian Inst Tech Madras

Inventors

• Pradeep Thalappil
• Mondal Biswajit
• Mahendranath Ananthu
• Som Anirban
• Bose Sandeep
• Ahuja Tripti
• Anil Kumar Avula
• Ghosh Jyotirmoy

Classifications

• B01D53/64

  Heavy metals or compounds thereof, e.g. mercury · CPC title

• B01D2253/1128

  Metal sulfides · CPC title

• C02F2305/08

  Nanoparticles or nanotubes · CPC title

• C01G39/00

  Compounds of molybdenum · CPC title

• B01D2257/60

  Heavy metals or heavy metal compounds · CPC title