6. A batch reactor is designed to remove a contaminant by adsorption onto a sorb

Question

6. A batch reactor is designed to remove a contaminant by adsorption onto a sorbent that can then be removed. The measured aqueous concentrations in the water after addition of the sorbent are as follows: a. What order of reaction does this appear to be with respect to the contaminant? b. Determine the rate constant. Be sure to include its units. c. Write a rate equation for this reaction. Be sure to include any assumptions that you must make in order to write this expression. d. Would increasing the concentration of sorbent in the batch reactor increase the rate of adsorption? Why or why not?

Explanation / Answer

C + S ?CS , if the adsorption follows this this type, then,

a) this is a zero order reaction.

b) rate constant K = ([C]0 - [C])/t, mol/s

c) r = -d[C]/dt, assumptions: 1. The sorbent quantity is high compared to the that of contaminant, and 2. The product CS is stable.

d) Increasing the concentration of sorbent in the batch reactor will not affect the rate of reaction, as the concentration of contaminant is the rate limiting factor.

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