Pavan Kumar Gautam

Layered Double Hydroxides Nanomaterials for Water Remediation

Layered double hydroxides (LDHs) belong to a general class called anionic clay minerals and have both synthetic and natural origin. LDHs are also known as hydrotalcite-like compounds (HTLCs). These materials are interesting because their layer cations can be changed among a wide selection, and the interlayer anion can also be freely chosen. Like cationic clays, they can be pillared and can exchange interlayer species thus increasing applications and making new routes to synthesize the derivatives. The present chapter deals with brief introduction of LDHs, their structure, properties, synthesis, and their applications in environmental remediation with reference to water treatment.

Estimation of Some Important Thermodynamic Properties of Organic Liquid Mixtures from Ultrasonic Velocity and Density Data

Using the recently proposed equations for calculating thermal expansion coefficient (α) and isothermal compressibility (βT) from density (ρ) and ultrasonic velocity (u) values, six binary organic liquid mixtures have been considered. These are: n-heptane+toluene (I); n-heptane+n-hexane (II); toluene+n-hexane (III); cyclohexane+nheptane (IV); cyclohexane+n-hexane (V), and n-decane+n-hexane (VI) at 298.15 K. Literature data for ρ and u of these mixtures are employed to compute α, βT, as well as γ, Pint and Γ. Calculated values of βT are compared with the earlier ones, and the agreement is found to be good.