The adsorption of 2,4,6-trichlorophenol (TCP) on coconut husk-based activated carbon prepared under optimized conditions was evaluated by Hameed et al. [140]. Adsorption capacity was found to increase with increase in initial concentration and agitation time, while acidic pH was more favorable for the adsorption of TCP. The maximum monolayer adsorption capacity of 716.10 mg/g was observed at 30 °C. The adsorption kinetics was found to follow the pseudo-second-order kinetic model. The mechanism of the adsorption process was determined from the intraparticle diffusion model. Boyd plot revealed that the adsorption of TCP on the activated carbon was mainly governed by particle diffusion.