Pradeep Thalappil

Department Of Chemistry

magnetic nanoparticle

nanomaterial

Adsorption

air pollution

Air pollution control

artificial membrane

chemical reaction

editorial

nanofabrication

Nanofiltration

NANOSENSOR

Nanotechnology

Photocatalysis

Soil pollution

SOIL TREATMENT

WATER CONTAMINATION

Water treatment

Environmental Pollutants

Environmental Remediation

Water Purification

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Hazardous Materials

We describe the degradation of chlorocarbons (CCl<inf>4</inf>, C <inf>6</inf>H<inf>5</inf>CH<inf>2</inf>Cl and CHCl<inf>3</inf>) in solution at room temperature (27 ± 4 °C) by the monolayer-protected silver quantum cluster, Ag<inf>9</inf>MSA<inf>7</inf> (MSA: mercaptosuccinic acid) in the presence of isopropyl alcohol (IPA). The main degradation products were silver chloride and amorphous carbon. Benzyl chloride was less reactive towards clusters than CCl<inf>4</inf> and CHCl<inf>3</inf>. Materials used in the reactions and the reaction products were characterized using several spectroscopic and microscopic tools such as ultraviolet-visible (UV/Vis) absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), photoluminescence spectroscopy, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), energy dispersive analysis of X-rays (EDAX) and scanning electron microscopy (SEM). We have shown that clusters are more efficient for the degradation of halocarbons than the corresponding monolayer-protected nanoparticles (Ag@MSA, particle diameter 15 ± 5 nm) at a given time and temperature. The higher reactivity of clusters is attributed to their small size and large surface area. Clusters and nanoparticles were used for reactions in supported (on neutral alumina) and unsupported forms. A possible mechanism for the reaction has been postulated on the basis of experimental results. © 2013 The Royal Society of Chemistry.

Journal of Materials Chemistry A

Atomically precise silver clusters for efficient chlorocarbon degradation

This paper describes a green method for the synthesis of graphenic material from cane sugar, a common disaccharide. A suitable methodology was introduced to immobilize this material on sand without the need of any binder, resulting in a composite, referred to as graphene sand composite (GSC). Raman spectroscopy confirmed that the material is indeed graphenic in nature, having G and D bands at 1597 and 1338 cm -1, respectively. It effectively removes contaminants from water. Here, we use rhodamine 6G (R6G) as a model dye and chloropyrifos (CP) as a model pesticide to demonstrate this application. The spectroscopic and microscopic analyses coupled with adsorption experiments revealed that physical adsorption plays a dominant role in the adsorption process. Isotherm data in batch experiments show an adsorption capacity of 55 mg/g for R6G and 48 mg/g for CP, which are superior to that of activated carbon. The adsorbent can be easily regenerated using a suitable eluent. This quick and cost-effective technique for the into a commercial water filter with appropriate engineering. © 2012 American Chemical Society.

ACS Applied Materials and Interfaces

Graphene from sugar and its application in water purification

Nanotechnologies for the treatment of water, air and soil

Journal	Journal of Hazardous Materials
ISSN	03043894
Open Access	No