Effect of different pretreatment methods on pore structure of activated carbon

Abstract

The effects of pretreatment on the pore structure of activated carbon were studied by the methods of water washing, acid washing, alkali washing and a combination of acid washing and alkali washing. It can be known from experiments that water washing has a cleaning effect on activated carbon, while acid washing helps to open the micropores of activated carbon and improve its porosity. Sodium hydroxide solution has an etching effect on activated carbon, which can increase the porosity and average particle size of activated carbon. All the pretreatment methods in this article can improve the adsorption capacity of activated carbon for nitrogen, and the pretreatment by dilute hydrochloric acid is tested to be the most effective.

Harnessing Agricultural Byproducts: Rice Husk-Derived Adsorbents for Heavy Metal Remediation in Water

“…When inorganic minerals dissolved in HCl, the adsorptive qualities of pores were improved and theresby their porosity increased. Dilute HCl treatment has been demonstrated to diminish ash content in activated carbon and expand the holes within the carbon structure, leading to a proliferation of micropores and an increase in the pore volume ratio [18].…”

K2CO3 on porous supports for moisture‐swing CO2 capture from ambient air

“…Five grams of activated carbon (AC) powder was dispersed in 200 mL of boiling water with stirring for 1 h at 100 C. After that, the activated carbon was rinsed with deionized water three times and dried at 120 C for 2 h. 33,34 The pretreated activated carbon was then impregnated in 200 mL of 1-mol/L K 2 CO 3 solution with stirring at room temperature for 4 h. Before characterization and DAC tests, the filtered sample was dried at 60 C in a vacuum oven (without air) for 48 h, to obtain the final composite porous adsorbent of K 2 CO 3 /AC. The composite adsorbents of K 2 CO 3 on porous magnesium oxide (MgO) and zeolite (Z) support were prepared employing the same method as above.…”