A novel biosorbent prepared by immobilized Bacillus licheniformis for lead removal from wastewater

Novel composite biosorbent from Bacillus cereus for heavy metals removal from aqueous solutions

“…The low removal efficiency at low pH was due to the presence of higher concentrations of hydrogen ions in the solution, which competed with heavy metal ions for the adsorption sites on the biosorbent surface. These results were in a good agreement with data for the effect of pH on Pb(II) biosorption published by other authors [24][25][26]38].…”

“…Probably at large amounts of the biosorbent, it is almost impossible for heavy metal ions to occupy all of the binding sites located on the biosorbent surface; and some diffusion limitations are possible, which decreases the biosorption effectiveness. These results are in accordance with literature data [24]. Based on the results obtained, we selected biosorbent dosage of 2 g/L as the most appropriate for all further biosorption experiments.…”

“…To overcome these drawbacks, a lot of studies are directed to application of immobilized bacterial, yeast or fungal biosorbents for heavy metals removal [19,21]. Based on the results obtained, many authors conclude that microbial biomass can remove heavy metals from aqueous solutions and waste waters both in free and immobilized form and immobilization increases the mechanical strength of the biosorbent [22][23][24][25][26][27][28][29][30]. There is no general conclusion unambiguously explaining the effect of immobilization on the heavy metals removal capacity of microbial sorbents.…”

Kinetic and Thermodynamic Sorption Study of Cobalt Removal From Water Solution With Magnetic Nano-Hydroxyapatite

“…However, the R 2 values at all temperatures used of the correlation coefficient indicated that the adsorption data for Co(II) onto MHAp best fit the pseudo-second-order model. The basic hypothesis subsequent to the pseudo-second-order model designated that chemisorptions played the most important role and may control the adsorption process [13,[31][32][33].…”

Synthesis of Quinoline/Phenanthroline Impregnated Sugarcane Bagasse for Recovering Uranium(VI) and Thorium(IV) from their Solutions

“…The composition of waste depends on the type of agricultural activities carried out and can be in the forms of liquid, solid or slurries , . However, non modified agricultural wastes have limitations such as low adsorption efficiency, lengthy contact time, excessive dose and high sensitivity to exceptionally low or high pH . For these reasons, agricultural waste needs to be modified to improve their adsorption abilities.…”