The Langmuir-Hinshelwood model mentioned equivalent to concern with the pseudo

first-order kinetics of photocatalytic degradation of basic azo dyes [2].

Several researchers, however, have questioned the possibility of the presence of multiple, independent retention sites and stated that a gradual change in slope from one time increment to the next was prevalent, indicating a continual change in the apparent rate constant (kD and precluding the operation of strictly

first-order kinetics for the entire course of reaction time (Jopony and Young 1987; Allen et al.

PME inactivation followed

first-order kinetics with a residual PME activity of 15% at all pressure-temperature combinations used by the researchers.

First-order kinetics mandates on/off symmetry, which means that the change in V[O.

7), for the

first-order kinetics a plot of ln(1-[alpha]) against t will yield a straight line, with a slop equal to -k.

If

first-order kinetics is found to be an adequate approximation for this system, a conventional fit of concentration/time data then yields the pseudo-first-order rate coefficient for the process.

0]) versus time is observed for the composite microspheres catalyst, indicating that the reaction follows

first-order kinetics.

Some of the physical simulations that obey

first-order kinetics include the flow of gas through an orifice (Coffin, 1948; Kahn, 1957) or the flow of liquids through capillaries (Lemlich, 1954; Davenport, 1975; Erwin, 1992).

Characteristic times associated with air-exchange, advective transport, diffusive transport, and

first-order kinetics are important for indoor-pollutant dynamics and affect the outcome of reactions.

It was pseudo

first-order kinetics," he says, "so I could use the same type of math that is used to measure the rate of radioactive decay--the math used in carbon dating.

2] response to such tests demonstrates the lagged-linear behaviour characteristic of

first-order kinetics, with the V[O.

Qing and co-workers used the

first-order kinetics in their study on pyrolysis of Huadian oil shale since it resulted in best fit of experimental data [12].