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AMRIT Technology: Report submitted to the Mashelkar Committee, Ministry of Drinking Water and Sanitation, Government of India

(This gives a comprehensive summary of our technology)


01. Species-specific uptake of arsenic on confined metastable 2-line ferrihydrite: A combined Raman-XPS investigation of the adsorption mechanism, Chennu Sudhakar, Avula Anil Kumar, Radha Gobinda Bhuin, Soujit Sen Gupta, Ganapati Natarajan, and T. Pradeep, ACS Sustain. Chem. Eng., 2018 (DOI: 10.1021/acssuschemeng.8b01217). PDF File  Supporting Information  

02. Biopolymer-reinforced synthetic granular nanocomposites for affordable point-of-use water purification, Mohan Udhaya Sankar, Sahaja Aigal, Shihabudheen M. Maliyekkal, Amrita Chaudhary, Anshup, Avula Anil Kumar, Kamalesh Chaudhari, T Pradeep, Proc. Natl. Acad. Sci. U S A, 110 (2013) 8459–8464(DOI: 10.1073/pnas.1220222110). PDF File  

03. Confined metastable 2-line ferrihydrite for affordable point-of-use arsenic free drinking water, Anil Kumar Avula, Anirban Som, Paolo Longo, Chennu Sudhakar, Radha Gobinda Bhuin, Soujit Sen Gupta, Anshup, Mohan Udhaya Sankar, Amrita Chaudhary, Ramesh Kumar and T. Pradeep, Adv. Mater., 29 (2016) 1604260 (DOI: 10.1002/adma.201604260). PDF File  

04. Metallic nanobrushes made using ambient droplet sprays, Depanjan Sarkar, M. K. Mahitha, Anirban Som, Anyin Li, Michael Wleklinski, R. G. Cooks and T. Pradeep, Adv. Mater., 28 (2016) 2223–2228 (DOI: 10.1002/adma.201505127). PDF File  

05. Rapid dehalogenation of pesticides and organics at the interface of reduced graphene oxide-silver nanocomposite, Dibyashree Koushik, Soujit Sen Gupta, Shihabudheen M. Maliyekkal and T. Pradeep, J. Haz. Mater., 308 (2016) 192-198 (DOI:10.1016/j.jhazmat.2016.01.004). PDF File  

06. Cellulose derived graphenic fibers for capacitive desalination of brackish water, Nalenthiran Pugazhenthiran, Soujit Sen Gupta, Anupama Prabhath, Muthu Manikandan, Jakka Ravindran Swathy, V. Kalyan Raman and T. Pradeep, ACS Appl. Mater. Interfaces, 7 (2015) 20156-20163 (DOI: 10.1021/acsami.5b05510). PDF File  

07. Approaching sensitivity of tens of ions using atomically precise cluster-nanofiber composites, Atanu Ghosh, Vedhakkani Jeseentharani, Mohd Azhardin Ganayee, Rani Hemalatha, Kamalesh Chaudhari, Cherianath Vijayan and T. Pradeep, Anal. Chem., 86 (2014) 10996–11001 (DOI: 10.1021/ac502779r).   PDF File  

08. Facile and rapid synthesis of dithiol-protected Ag7 quantum cluster for selective adsorption of cationic dyes, M. S. Bootharaju and T. Pradeep, Langmuir, 29 (2013) 8125-8132 (DOI: 10.1021/la401180r). PDF File  

09. Selective visual detection of TNT at the sub-zeptomole level, Ammu Mathew, P. R. Sajanlal, and T. Pradeep, Angew. Chem. Int. Ed., 51 (2012) 9596-9600 (DOI: 10.1002/anie.201203810). PDF File  

10. Extraction of chlorpyrifos and malatheon from water by metal nanoparticles, A. Sreekumaran Nair, T. Pradeep, J. Nanoscience and Nanotechnology., 7 (2007) 1-7 (DOI: Doi:10.1166/jnn.2007.733). PDF File  

11. Potential of silver nanoparticle-coated polyurethane foam as an antibacterial water filter, Prashant Jain and T. Pradeep, BIOTECHNOL BIOENG., 90 (2005) 59-63 (Doi: 10.1002/bit.20368). PDF File  

12. Halocarbon mineralization and catalytic destruction by metal nanoparticles, A. Sreekumaran Nair and T. Pradeep, Current Science., 84 (2003) 1560-1564. PDF File  

13. Detection and extraction of endosulfan by metal nanoparticles, A. Sreekumaran Nair, Renjis T. Tom, and T. Pradeep, J. Environ. Monitoring., 5 (2003) 363-365. PDF File  


01. A method of preparing purified water from water containing pesticides (chlorpyrifos and malatheon) and purified water prepared by the said method, A. Sreeekumaran Nair and T. Pradeep, Indian patent 200767, June 2, 2006. PDF File 

02. Extraction of malatheon and chlorpiryhphos from drinking water by nanoparticles adsorbent composition, a device and a method for decontaminating water containing pesticides, A. Sreekumaran Nair and T. Pradeep, PCT application, PCT/IN2005/000002. Granted as, Extraction of malatheon and chlorpiryhphos from drinking water by nanoparticles, US 7,968,493; A method for decontaminating water containing pesticides, EP 17,15,947. PDF File 

03. Polyurethane foam coated with silver nanoparticles, Prashant Jain and T. Pradeep, Indian patent, 219111, application no 891/CHE/2004 granted on April 24, 2008. PDF File 

04. A method to produce supported noble metal nanoparticles in commercial quantities for drinking water purification, A. Sreekumaran Nair and T. Pradeep, 1879/CHE/2007 dated December 10, 2007, patent number 277112. PDF File 

05. Organic polymer-inorganic fine particle antimicrobial composites and uses thereof, A. Sreekumaran Nair and T. Pradeep, PCT/IB2010/002016, Aug. 17, 2010. Issued in the US, Application No. 12/639,403, 16/12/2009, US 82,68,359, September 18, 2012.  PDF File 

06. Multielement and multiproperty tagging, P. R. Sajanlal and T. Pradeep, PCT/IB2010/002006, August 13, 2010. Issued as, Coated mesoflowers for molecular detection and smart barcode materials, WO2014178006A2. Issued in Japan No. 5492301, on March 7, 2014. Issued in the US as, Multielement and multiproperty tagging, Application No. 12/636,370, 11/12/2009, US 8,659,391 B2, on February 25, 2014. PDF File 

07. Gravity-fed axial flow filter block for domestic water purifiers and the method of making the same, T. Pradeep, M. Udhaya Sankar, Anshup and Amrita Chaudhary, 2892/CHE/2010 filed on September 30, 2010, patent number 282257, granted on March 31, 2017. PDF File 

08. Gold and silver quantum clusters and methods for their preparation and use, T. Pradeep and E. S. Shibu, PCT/IB2011/000260, February 14, 2011. Issued in the US 8999717, on April 7, 2015. Issued also as Japanese patent - IN-811301-05-JP-NAT.  PDF File 

09. Single container gravity-fed storage water purifier, T. Pradeep, Amrita Chaudhary, M. Udhaya Sankar and Anshup, 3510/RQ-CHE/2011 filed on May 2, 2011. Issued in UAE for the application number 1161/2013, in Australia with patent number 2012251424, in China with patent number 2012800247893, in Israel with patent number 229223.  PDF File 

10. Organic templated nanometal oxyhydroxide, T. Pradeep, Shihabudheen M. Maliyekkal, Anshup, Udhaya Sankar, Amrita Chaudhary, PCT/IB2011/001551, June 2, 2011. Issued in UAE for application No. 1238/2012. PDF File 

11. Multilayer organic-templated-boehmite-nanoarchitecture for fluoride removal, T. Pradeep, A. Leelavathi, Amrita Chaudhary, M. Udhaya Sankar and Anshup, 4062/CHE/2011, November 24, 2011. Patent number: 286929, Granted on August 31, 2017.  PDF File 

12. Detection of quantity of water flow using quantum clusters, T. Pradeep, Leelavathi A, M. Udhaya Sankar, Amrita Chaudhary, Anshup, T. Udayabhaskararao, 1521/CHE/2012, April 17, 2012. Issued in China with patent number 201380025718X.  PDF File 

13. A composition for enhanced biocidal activity and a water purification device based on the same, T. Pradeep, M. Udhaya Sankar, Amrita Chaudhary, Sahaja Aigel, Swathy JR, Anshup, Patent Application Nos.: WO 2015/059562 A1, US20160135468. Issued in UAE for the application number PCT/IB2014/002316, in Australia for the application number 2014338691, in Brazil for the application number BR11 2015 0323731, in Oman for the application number OM/P/2015/00340, in Qatar for the application number 2867CHE2013.  PDF File 

14. One container gravity fed storage water purifier, Indian patent application, T. Pradeep, Amrita Chaudhary, M. Udhaya Sankar and Anshup, PCT/IB2012/001237. Issued in the Japan for application 2014-508886. PDF File 

15. Water purifier, Design application number 254443, filed on June 11, 2013.  PDF File 

16. Anti-gravity water filter cartridge, Design patent number 260460, filed on February 19, 2014.  PDF File 

17. AMRIT drinking water purifier, Design application number 257312, filed on October 09, 2013, Issued December 16, 2014. PDF File 

18. Domestic water purification unit, design patent number 288810, Granted on October 16, 2017. Issued in UAE 1080/2013, in Australia 2012243079 (28/9/2017). PDF File 

19. Reduced graphene oxide-based-composites for the purification of water, T. Pradeep,Shihabudheen M. Maliyekkal, Shreeprasad T. Sreenivasan, US Patent, US20180221850A1, Granted on Aug 08, 2018. PDF File 

20. Detection of quantity of water flow using quantum clusters, T. Pradeep, Leelavathi Annamalai, Mohan Udhaya Sankar, Amrita Chaudhary, Anshup, Thumu Udayabhaskara Rao, US 10,041,925 B2, Issued August 7, 2018. PDF File 

Incubated Companies

01. InnoNano Research Private Limited, has established production facilities now and has already delivered orders worth ~$4 million. The technology has reached 600,000 people already.  

02. Safewater Nano Pte. Ltd. is a company incorporated in Singapore, to take our water technologies to international markets, at a funding of $18 million.  

03. Innodi Water Technologies Private Limited, started producing capacitive deionization units. Factory for production was inaugurated in December 2017.  

04. Vayujal Technologies Private Limited, has put together its first prototype on atmospheric water capture at 100 L/day scale using our highly efficient surfaces. It has received initial funding needed for its activities.  

05. Aqueasy Innovations Private Limited has been established to create efficient water transport solutions. Its prototypes have been tested.  

All are co-owned by IIT Madras. 


News Highlights

Filter out trouble, Down to Earth, December 2004

Excerpts: “Chemists at Indian Institute of Technology (IIT) Chennai, have developed a nanoparticle based technique to remove pesticides from drinking water. The feat is noteworthy, for exposure to pesticides can trigger genetic mutations and neurological disorders...”

Pesticide filter debuts in India, Chemistry World, April 2007

Excerpts: “The chemistry occurs in a wide concentration range of environmental significance. He added that tests proved silver particles from the filter are not released into the water...”

A purifier that yields arsenic-free water, The Hindu, Feb 24, 2013
Excerpts: “The Arsenic Task Force of the West Bengal government has certified and approved ...”

Affordable safe drinking water, Nature India, May 7, 2013
Excerpts: “We had to look at several problems with water...”

Cheap nanotech filter cleard hazardous microbes and chemicals from drinking water, Scientific American, May 9, 2013
Excerpts: “This is a room-temperature green synthesis, which means it can be deployed in any part of the world...”

Composite nanomaterials purify drinking water affordably, Materials 360, May 10, 2013
Excerpts: “I've been on this dream for quite some time, it's a very big thing for me...”

The new water technologies that could save the planet, The Guardian, July 22, 2013
Excerpts: “The well was a transformative invention, though it is often...”

Walking on Water, Immerse, January 2014
Excerpts: “Arsenic poisoning causes several illnesses from skin......”

Nanotech on tap, C&EN, November 2014
Excerpts: “Indian technology offers clean water at low cost. ...”

With $18 million funding, IIT Madras professor breaks the glass ceiling, The Hindu, July 16, 2016
Excerpts: “I am glad that technologies from academic labs are getting venture funding in units of millions of dollars...”

India's science start-ups, Chemistry World, November 11, 2017
Excerpts: “Backed by government programmes, Indian entrepreneurs are overcoming ......”


** Please see other pages also for more information on other papers, patents, news reports, etc.​