Enhanced adsorptive removal of hexavalent chromium in aqueous media using chitosan-modified biochar: Synthesis, sorption mechanism, and reusability

Effect of wood biochar dosage and re-use on high-solids anaerobic digestion of chicken litter

The level of aeration, pH and initial concentration of Cr (VI) ions have been investigated with use of statistical analyses experiments (Box-Behnken design). The values pH 2.0, aeration of 100 % and initial concentration of Cr (VI) ions in the MES-buffer of 100 mg/l for biosorption of Cr (VI) ions of yeasts’ S. cerevisiae UCM Y-1968 are optimum ones. The highest calculated predicted level of the biosorption of Cr (VI) ions was 40,708 mg/g for 3 hours of the factors influence. The received regression equations as the function from two main effects, such as a level pH and initial concentration of ions Cr (VI) in cultivation medium with use of regress factors were derived by the statistical analysis, and the models with multiple correlation coefficient R2: 0,9648; 0,9766; 0,9524; 0,9334 were obtained.

Mechanism of Cr(VI) removal by magnetic greigite/biochar composites

Removal of Cr(VI) ions by sewage sludge compost biomass from aqueous solutions: Reduction to Cr(III) and biosorption

Single-step synthesis of activated magnetic biochar derived from rice husk for hexavalent chromium adsorption: Equilibrium mechanism, kinetics, and thermodynamics analysis

Enhanced adsorption of Cr(VI) pollutants using CaFe2O4@rGO modified-biochar derived from mixture of black soldier flier exuviae and durian peel

The adsorption of chromate on octacalcium phosphate (OCP) was investigated as a function of contact time, surface coverage, and solution pH [...]

Marine macro-alga Sargassum cymosum as electron donor for hexavalent chromium reduction to trivalent state in aqueous solutions

Conversion of waste polystyrene into porous adsorbents for efficient removal of hazardous pollutants: Adsorption properties and adsorption mechanism

The novel PEI-modified biochars and their application for the efficient elimination of Cr(VI) from aqueous solutions.

Optimizing removal of chromium (VI) ions from water by coagulation process using central composite design: Effectiveness of grape seed as a green coagulant

The presence of heavy metals in wastewater is an environmental concern and the current treatment procedures are very expensive so it is necessary to find effective and inexpensive biosorbents. In this study, Fucus vesiculosus was used as a biosorbent for the biosorption of Cr(III) ions from the aqueous solutions. Biosorption parameters, such as pH, adsorbent dose, contact time, and initial concentrations of Cr(III) had the most impact on the sorption process. The required pH value for sorption was 5, the biosorbent dose was 4.0 g/L, the contact time was seen to occur after 90 min, and the Cr(III) removal decreased from 98.9 to 92%. The maximum biosorption capacity of chromium was 14.12 mg/g. FTIR analysis of Fucus vesiculosus biomass before the sorption process contains carboxyl, amino, hydroxyl, alkyne, and carbonyl groups, and according to the analysis after the sorption process, it was found that Cr(III) metal ions were incorporated within the sorbent during the interaction with (=C–H) active functional groups. The biosorption data were found to be perfectly suited by Langmuir equilibrium isotherm model. According to the results of this study, Fucus vesiculosus is an effective biosorbent for the removal of Cr(III) from aqueous solutions.

Effect of soil pH on the transport, fractionation, and oxidation of chromium(III).

Removal mechanisms of aqueous Cr(VI) using apple wood biochar: a spectroscopic study

Removal of divalent cations and oxyanions by keratin-derived sorbents: Influence of process parameters and mechanistic studies