Silica adsorbent prepared from spent diatomaceous earth and its application to removal of dye from aqueous solution

Basic Dye Adsorption on Low Cost Biopolymer: Kinetic And Equilibrium Studies

“…The second portion is the gradual adsorption stage where intraparticle diffusion is the rate limiting. In some cases, the third portion exists, which is the final equilibrium stage where intraparticle diffusion starts to slow down due to the extremely low adsorbate concentrations left in the solutions [33]. As can be seen from Figure 6, the linear line did not pass through the origin and this deviation from the or near saturation might be due to the difference in the mass transfer rate in the initial and final stages of adsorption [34].…”

Adsorption behavior of Li+ onto nano-lithium ion sieve from hybrid magnesium/lithium manganese oxide

“…According to the Weber-Morris model, the plot of q t versus t 1/2 should be linear if intraparticle diffusion is involved in the adsorption system and if these lines pass through the origin, then intraparticle diffusion is the rate controlling step [39][40][41][42]. When the plots do not pass through the origin, this is indicative of some degree of boundary layer control, and this further indicates that intraparticle diffusion is not the only rate-limiting step, but also other kinetic models may control the rate of adsorption, all of which may be operating simultaneously.…”

Possible mechanism of structural incorporation of Al into diatomite during the deposition process I. Via a condensation reaction of hydroxyl groups

“…Diatomite is primarily composed of amorphous hydrated silica (SiO 2 ÁnH 2 O), which is categorized as non-crystalline Opal-A, according to the mineralogical classification [3,4]. Diatomite is easily obtained at very low cost and has many unique physical and chemical characteristics, enabling their wide uses in a variety of applications for high-performance technologies; thus and widely utilized [5][6][7][8]2,[9][10][11][12].…”