Enhanced removal of Cr(VI) from aqueous solution by nano- zero-valent iron supported by KOH activated sludge-based biochar

Adsorption Performance of Methylene Blue by KOH/FeCl3 Modified Biochar/Alginate Composite Beads Derived from Agricultural Waste

“…The Langmuir isothermal model assumes that monolayer adsorption occurs on the adsorbent surface with equivalent adsorption sites, while the Freundlich isothermal model is used to describe equilibrium data and adsorption characteristics for a heterogeneous surface. The Langmuir model has a lower root mean square error compared to the Freundlich model, indicating that the Langmuir isotherm model is a better fit than the Freundlich isotherm model for the adsorption data in the current experiments, in agreement with a previous report [ 42 ]. Thus, the adsorption of MB on MCB/ALG−1 samples is consistent with monolayer adsorption.…”

Coupling behavior and enhancement mechanism of porous structure, graphite microcrystals, and oxygen-containing groups of activated biochar for the adsorption of phenol

“…Owing to the catalytic cavitation and strong ablation of KOH, honeycomb porous structures were formed in KH-ABs, and similar results were observed in an already existing study. 35 Although the porous structure of KH-ABs was by no means well developed, it was significantly characterized by the high occupancy of micropores. The surface area of their micropores accounted for 78.56-88.07% of the total specific surface area, and the volume of micropores accounted for 56.25-65.00% of the total pore volume (Table 4).…”

A novel sludge-based biochar composite adsorbent CS/SBC-H3PO4 for efficient Cr(vi) removal from aqueous solution

“…The preparation method of SBC refers to the method of Wang et al 10 An appropriate amount of sludge powder was placed into a graphite boat, and then the graphite boat was placed in a tube furnace and heated to 600 1C at a rate of 5 1C per minute under a nitrogen atmosphere for 2 h. After cooling to room temperature, the black solid in the graphite boat was taken out and washed with 1 mol L À1 of hydrochloric acid and deionized water in turn until the pH of the eluate was neutral. Finally, the washed black solid was dried in an oven at 80 1C for 6 h to obtain SBC.…”