Fe3+交联羧甲基纤维素钠粘合剂制备高耐受性颗粒活性炭OA

Coconut shell activated carbon powder holds significant application value in wastewater and exhaust gas treatment.However,it faces challenges such as difficulty in immobilization and poor recyclability,which can easily lead to secondary pollution.The development of biomass-based binders is an important strategy for enhancing and improving the stability of powdered adsorbents.In this study,the green biomass material sodium carboxymethyl cellulose(CMC)was modified.Through thermal cross-linking and the introduction of cross-linking sites provided by bridging with modified Fe3+ions,its mechanical properties and solvent resistance were improved.This modification addresses the issue of traditional CMC being easily soluble in water,enabling the activated carbon granules to adapt to various environments.Using powdered activated carbon with a particle size of 75～150 μm and a binder-to-activated-carbon mass ratio of 0.9:1,the resulting granules achieved a BET surface area of 871.83 m2/g without requiring an activation step,with a porosity reaching 91.02%of the surface area of the pre-formed powdered activated carbon.The pellet hardness measured via a standard hardness testing method was comparable to that of commercial activated carbon.Cyclic adsorption-desorption tests indicated that the activated carbon prepared with this modified binder shows potential for removing organic compounds from wastewater and for regeneration and reuse in various applications,suggesting promising commercial prospects.