Biomass-derived nitrogen-doped hierarchically porous carbon networks as efficient absorbents for phenol removal from wastewater over a wide pH range

Abstract

Biomass-derived nitrogen-doped hierarchically porous carbon adsorbent was synthesized and exhibited an excellent adsorption performance for phenol removal.

Rice Husk‐Derived Activated Carbons for Adsorption of Phenolic Compounds in Water

“…Herein, the Langmuir model (Figure B) can well describe the adsorption isotherms. Particularly, AB2‐3‐750 with relatively high correlation coefficient value ( R 2 = 0.9991) indicated a monolayer adsorption behavior . Both the increase of pyrolysis temperature and KOH activation enhanced the surface heterogeneity of biochars …”

“…The adsorption isotherms include Freundlich, Langmuir, and Brunauer–Emmett–Teller (BET) theory. The N 2 ‐sorption isotherm is extensively applied for characterization of surface areas and pore structures . As shown in Figure A, AB2‐3‐750 showed the type II adsorption isotherm.…”

“…It may be attributed to the formation of carboxylic acids during the RH pyrolysis. Meanwhile, the OH, CO, and CO groups are probably contributed from the etching effect of KOH on porous carbon networks during the activation process . After the adsorption process, the surface functional groups had no obvious changes (Figure B).…”

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

“…4 and the R 2 values presented in Table 2, the Langmuir isotherm model can t better than the Freundlich isotherm model, suggesting that the interactions between Pb(II) and the sorbents might be mainly related to mono-layer adsorption; this might be because of the homogeneous distribution of active sites on the biochar sample surfaces. 44 The maximum adsorption amount of Pb(II) on CS-CNT was signicantly higher than that on CS, indicating that the presence of carbon nanomaterials enhanced the heavy metal sorption ability of biochar.…”

A cellulose acetate/Amygdalus pedunculata shell-derived activated carbon composite monolith for phenol adsorption

“…[30][31][32] SEM observation showed a three-dimensional open-porous walled structure, which was conducive to the efficient adsorption of phenol. [33][34][35] In the preparation of composite materials from dispersions, a stable and homogeneous dispersion of functional materials should be retained during the formation of polymer matrix. 24,36 In the present study, APS-derived AC was well suspended in the CA solution of a DMF/1-hexanol mixture, resulting in the good dispersion of AC on the skeleton surface of the monolith (Fig.…”