Adsorption of Pyrene onto the Agricultural By-Product: Corncob

Abstract

The adsorption behavior of pyrene on corncob was studied to provide a theoretical basis for the possible use of this material as an immobilized carrier for improving the bioremediation of PAH-contaminated soil. The results were as follows. Kinetic experiments showed that the adsorption processes obeyed a pseudo-second-order model. The intraparticle diffusion of Weber-Morris model fitting showed that the film and intraparticle diffusions were the key rate-limiting processes, and the adsorption process mainly consisted of three steps: boundary layer diffusion and two intra-particle diffusions. Experimental adsorption data for pyrene were successfully described by the adsorption-partition equilibrium model. The maximum adsorption capacity at 25°C was 214.8 μg g(-1). The adsorption contribution decreased significantly when the Ce/Sw (the equilibrium concentration/solubility in water) was higher than 1. Adsorption decreased with increased temperature. Based on the above results, the corncob particles could be helpful in the bioremediation of pyrene-contaminated soil.

Nocardioides: “Specialists” for Hard-to-Degrade Pollutants in the Environment

“…In a study, it was found that their volatility decreased as the number of benzene rings increased, the solubility in fat increased, and the difficulty of environmental degradation increased. Due to their high level of carcinogenicity, teratogenicity, mutagenicity, and ecological toxicity [69], aromatic compounds-which are typically present in water, soil, and sediments [68]-pose a severe risk to human health and the environment [74]. Nocardioides has been found to degrade aromatic compounds such as 2-dinitroanisole, ibuprofen, dibenzofuran, and nitrophenol.…”

Facile Synthesis of Sodium Dodecyl Sulfate Intercalated Mg‐Al LDH and its Excellent Adsorption Performances for Cu2+ from Aqueous Solution

“…Moreover, the values of C (17.94 and 40.18) calculated by intra–particle diffusion model were all greater than 0. These results indicated that intra–particle diffusion is not the sole rate–limiting step, other kinetic models may also govern the adsorption rate, or multiple rate–controlled steps may manipulate concurrently together [47] …”

“…These results indicated that intra-particle diffusion is not the sole rate-limiting step, other kinetic models may also govern the adsorption rate, or multiple rate-controlled steps may manipulate concurrently together. [47]…”

Synthesis of H4Mn5O12 Nanotubes Lithium Ion Sieve and Its Adsorption Properties for Li+ from Aqueous Solution

“…The plot of q t versus t 1/2 at different initial Li + concentration is shown in Figure , and the corresponding k calculated from the plot is also listed in Table . On the basis of the Weber‐Morris model, the plot of q t versus t 1/2 should show a linear if intraparticle diffusion is included in the adsorption process. Besides, if these lines pass through the origin, which indicated intraparticle diffusion is the rate controlling step .…”