活性炭负载Fe/Mo双金属催化剂处理HMX废水研究OA

To address the treatment dilemma of HMX production wastewater characterized by complex components,high toxici-ty and poor biodegradability,a heterogeneous Fenton catalyst Fe2.5Mo/AC loaded with Fe/Mo bimetals was prepared via the impregnation-high temperature carbonization method using chitosan-modified activated carbon(AC)as the carrier.The amino functional groups of chitosan were adopted to anchor metal active sites and inhibit the agglomeration of active components;meanwhile,Mo was introduced to construct a Fe-Mo bimetallic synergistic system,which accelerated the Fe³⁺/Fe²⁺ redox cycle and improved the generation efficiency of·OH.Results showed that a stable Fe-Mo-O/N composite structure was formed inside the catalyst with uniformly distributed active sites.Batch experimental results indicated that the catalytic system was applicable to a wide pH range of 2.09-7.15.The removal efficiencies of HMX and COD reached 83.1%and 44.5%,respectively,and the B/C ratio of wastewater was increased from 0.011 to 0.367,presenting an obvious improvement in biodegradability.The optimal reaction conditions were determined as catalyst dosage of 5 g·L-1,H2O2 concentration of 300 mM and reaction temperature of 25℃.Radical quenching experiments combined with electron paramagnetic resonance(EPR)tests verified that·OH,1O2 and·O2-jointly participated in the degradation of HMX.After seven cycles of reuse,the HMX removal rate remained above 70%with extremely low metal leaching capacity.During 14 h continuous operation in the fixed bed reactor,the removal efficiencies of COD and HMX were stably maintained above 70%and 60%,respectively.