In response to the high effi ciency and economic degradation requirements of typical VOC pollutants benzene, this study 

synthesized a new type of rice husk-fl y ash-based geopolymer microsphere (RFG) as an adsorbent through suspension 

solidifi cation method, which was used to recover and enrich Cu(II) and Mn(III) from wastewater. The supported bimetallic 

oxide catalyst CuMnO x /RFG was successfully prepared by oxygen calcination of adsorption products. CuMn 0.6 O x /RFG 

has a mesoporous structure and uniform distribution of Cu-Mn. At a mass space velocity of 4000 ml/(g · h), the benzene 

conversion rate is as high as 99.7% and the T 90 is as low as 273℃. Even after 5 cycles and high humidity environment, 

its benzene conversion rate remains above 93%. The catalytic eff ect on benzene is improved by about 30%, and the 

required energy barrier is reduced by 15.4%, demonstrating effi cient low-temperature catalytic oxidation ability and good 

stability. Its excellent low-temperature performance is attributed to: (1) Mesoporous carriers possess mechanical properties,

sintering resistance, and water resistance. High specifi c surface area ensures high dispersion of active components, 

promotes benzene adsorption and exposure of active centers; (2) Cu-Mn synergistically reduces component particle size 

and crystallinity, increases Mn 3+ /Mn +

 ratio and oxygen vacancy density, and accelerates lattice oxygen activation and 

migration. The entire preparation and application process integrates solid waste utilization-heavy metal adsorption-VOCs 

catalysis, achieving high value-added utilization of fl y ash and providing an eff ective way to synthesize effi cient, low-cost, 

halogen-free, and environmentally friendly supported catalysts.