Comparative chromium adsorption studies on thermally and chemical-thermally modified Ficus carica adsorbents

Adsorptive performances and valorization of green synthesized biochar–based activated carbon from banana peel and corn cob composites for the abatement of Cr(VI) from synthetic solutions: Parameters, isotherms, and remediation studies

“…4 , the pHzc value of the BP–CCAC@ZC3 biochar adsorbent in this work was found to be 4.723. Hashem et al [ 66 ] showed that pH values above and below pHzc lead to negatively and positively charged solid surfaces, respectively. The surface of BP–CCAC@ZC3 biochar was positively charged under pH 4.723, and thus its surface adsorbs negatively charged chromate (HCrO4 – ).…”

“…Comparatively, Cr 3+ was more easily attracted by electrostatic attraction than other chromium species on the heterogeneous surfaces of adsorbents. Furthermore, under acidic conditions, the negatively charged anionic chromate (HCrO4 – ) easily binds to the positively charged BP–CCAC@ZC3 adsorbent through electrostatic attraction [ 66 ]. …”