Sorption of ionic dyes onto untreated low-rank coal – oxihumolite: A kinetic study

Guava (Psidium guajava) leaf powder: Novel adsorbent for removal of methylene blue from aqueous solutions

“…In this plot, initial linear portion seen is attributed to bulk diffusion, and the second to intraparticle/pore diffusion [3]. Plateau in the plot indicates equilibrium [29]. The slope of the linear portion of the plot has been defined as a rate parameter which characterizes the rate of adsorption in the region where pore diffusion is rate limiting.…”

Theoretical models of sorption kinetics including a surface reaction mechanism: A review

“…Examples of an opposite trend are rather sparse [118][119][120]. Most of them include the data fulfilling both the following conditions: (i) the influence of experimental random error is not significant (judging from the scatter of the experimental points) and (ii) the data (or at least their significant part) are collected when the system is not very close to equilibrium.…”

Equilibrium and kinetic studies on the adsorption of acidic dye by the gel anion exchanger

“…Adsorption is found to be superior to other techniques in terms of initial costs, simplicity of design as well as ease of operation. The most widely used sorbents in the treatment of wastewaters containing dyes are activated carbon [14][15][16][17][18][19] and low-cost materials [20][21][22][23][24][25].…”