Adsorption properties and microporous structure of adsorbents produced from phenolic resin and biomass

Abstract

Mixtures of novolac resin and olive stone biomass in proportions 20 : 80 (w : w) are cured, pyrolyzed up to 1000°C (material C20), and activated with steam (material C20a). The adsorption properties of these materials and a commercial activated carbon (CC) are investigated based on the adsorption of nitrogen and pentane. The adsorption capacity, the surface area determined by the BET and DRK equation, and the pore volume determined as micropore volume by the DR equation, and as cumulative pore volume related to the Kelvin equation, for the materials follow the order C20a > CC > C20. The DR equation can be applied for the adsorption of nitrogen on the materials examined in the region of P/P, = 0.005 up to 0.3 that exceeds in both sides the common range for the applicability of the DR equation. The activated materials C20a and CC are mainly microporous and reveal the type I isotherms of the Brunauer classification for nitrogen adsorption. The only pyrolyzed material, C20, contains both micropores and mesopores and reveals characteristics of both types I and 11. The number of layers for C20a and CC is lower than 2 and for C20 is more than 2 . 0 1995 John Wiley & Sons, Inc.

Application of sonication in improving the Cu(II) adsorptivity and recycling performanc of activated carbon fibers

“…As figure 2(d) shows, Cu(II) adsorption value Q is greatly improved after the reactivation process and it reaches the maximum (Q Z-VACF-12h =16.26 mg g −1 ) when the time of sonication-assisted impregnation is 12 h. The diameter of free Cu(II) in aqueous phase is 0.146 nm, thus physical adsorption of VACFs for Cu(II) mainly comes from the adsorption potential of micropore structure and mesopore structure. Hence, the enhancement of Cu(II) adsorptivity is increasement of adsorption potential energy caused by the simultaneous increase of micropore volume and BET surface area.The results shows that sonication-assisted zinc chloride reactivation process is an efficient modification method to enhance the Cu(II) adsorptivity of VACFs and sonication-assisted impregnation time of 12 h has the best promotion function on the Cu(II) adsorptivity of VACFs [23][24][25][26]. ( ) As table 3 shows, both Lc and La increase during the recarbonization process, and microcrystal sizes decrease evidently with the increase of sonication-assisted impregnation time.…”

Olive Stones as Filler for Polymer-Based Composites: A Review

“…In another study published by the same authors [ 56 ], they continued to prepare mixtures of novolac resin and olive stone biomass in proportions 20:80 (wt.%:wt.%) which were first cured and then pyrolyzed up to 1000 °C (material C20) and, finally, activated with steam (material C20a). The sample manufacturing process was very similar, but, in the present case, the carbonization of the cured materials was carried out in cylindrical tube ovens under continuous flow of N 2 .…”

On the structure of an asymmetric carbon membrane with a novolac resin precursor

“…Carbonaceous materials of this Section 3.2.f. and a similar type are appropriate for a wide range of separation processes (see, for example, Simitzis et al 10 ). Our product finds a use as a gas…”