The adsorption isotherms for naphthalene, phenanthrene, hexachlorobenzene, and pentachlorophenol on soil were determined in the presence of liquid and supercritical carbon dioxide. The adsorption isotherms for naphthalene, phenanthrene, and hexachlorobenzene are linear, whereas for pentachlorophenol, a slight deviation from linearity was observed. The heats of adsorption of naphthalene, phenanthrene, hexachlorobenzene, and pentachlorophenol on soil at 308 K were found to be in the range of 1–5 kcal/mol, indicating physical adsorption. The desorptive behavior of these organics from soil using supercritical carbon dioxide was also investigated, and local equilibrium theory was found to predict the desorption profiles fairly accurately. © 1993, American Chemical Society. All rights reserved.

Giridhar Madras

Department of Chemical Engineering

C. Erkey

M. Orejuela

A. Akgerman

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

IITH offers&nbsp;<a href="https://iith.ac.in/academics/under-graduate/">undergraduate programs</a>&nbsp;in all the classical engineering disciplines, applied sciences, design, as well as several modern interdisciplinary areas. Students are given a flexibility to explore a broad set of areas, and potentially pursue a minor or double major in a discipline that is not their own. Students who wish to seek a deeper understanding of their own discipline are strongly encouraged to get involved in cutting-edge research with the help of a faculty to mentor them, and earn an Honors in their own field.

The very foundation of IIT Hyderabad is based on&nbsp;<a href="https://iith.ac.in/research/">research and innovation</a>. The vibrant research culture is evident from the number of patents and publications that IITH produces consistently every year. IITH offers&nbsp;<a href="https://iith.ac.in/academics/programmes-offered/">graduate programs</a>&nbsp;at both a masters, and a doctoral level, in several diverse areas. There are separate programs for technology, design, science, and liberal arts. The&nbsp;<a href="https://iith.ac.in/academics/post-graduate/">MTech program</a>&nbsp;is offered in various modes and durations to cater to the ever-growing need of postgraduate level professionals in the country.

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IITH enjoys a very special relationship with Japanese universities and industries that goes beyond academic and research collaborations. In fact, some of the iconic buildings in IITH campus will carry the signature of Japanese architecture.

IITH creates a unique holistic ecosystem for education that offers interactive learning, a very flexible academic structure, cutting-edge research, strong industry collaboration, and entrepreneurship. This is an environment which enables students and faculty to translate their dreams into realities.

Journal	Environmental Science and Technology
ISSN	0013936X