Study On Synthesis And Performance Of Activated Carbon Fiber Composite Photocatalyst

Water shortage and water pollution are main problems facing the world.Traditional technologies have many faults.Adsorption-photocatalytic degradation system as a green and clean method,has development prospects in the treatment of water pollutants.Activated carbon fiber（ACF）was selected as the adsorption material.The effects of pretreatment methods,different pollutants and p H on the adsorption performance of ACF were investigated.The regeneration ability of phenol before and after pretreatment was compared.The adsorption kinetics and thermodynamic properties of carbon fiber were studied.Acid treatment increased the oxygen-containing functional groups,the surface structure changed.Under neutral and acid conditions,they are more conducive to the adsorption of small molecules of phenol,but poor adsorption of larger molecules.The adsorption of phenol conforms to the quasi-second-order kinetic and Langmuir isotherms At 283.15 K,the maximum adsorption capacity was 130.38 mg·g^-1 of ACF-1 with 240mg·L^–1 phenol of 50 m L.Graphene aerogels（GA）were synthesized on the surface of ACF by hydrothermal method,which enhanced the adsorption rate to 96.72%at 30 min.Mixed valence BiO_2-x and BiO_2-x/ACF-1 were prepared by hydrothermal method.Their synergistic adsorption and degradation of phenol were investigated.The abundant oxygen vacancies of BiO_2-x were conducive to the adsorption of phenol.The amount of phenol adsorbed was about 3 times that of Bi₂O₃.Oxygen vacancies led to the red shift of the band edge and the light response range was widened,which facilitated the generation of carrier.The generated superoxide radical and hole could completely degrade phenol in90 min.The photocatalytic activity of the complex of BiO_2-x with Bi₂WO₆,Bi₂O₄,BiOI and Fe OOH composites was affected by the adsorption of BiO_2-x,and Bi⁵⁺is unstable that may be converted to Bi³⁺,which affected degradation activity.BiO_2-x is more suitable for composite materials without changing its valence state.Combine the ACF-1with BiO_2-x to form an adsorption photocatalytic synergistic system.The removal amount of 1/4BiO_2-x/ACF-1 was 39.94 mg·g^-1 with the 30 m L phenol at a concentration of 40mg·L^-1 at 0.0220 g.Figure 42;Table 8;Reference 101...