TiO_2/活性炭复合纳米纤维膜对亚甲基蓝的吸附研究

Adsorption and photocatalytic regeneration of TiO_2/activated carbon composite nano-fiber membrane

以自制的TiO2/活性炭复合纳米纤维膜作为吸附剂,以亚甲基蓝为目标污染物,研究了亚甲基蓝初始浓度、温度、TiO2/活性炭复合纳米纤维膜投加量、pH等对TiO2/活性炭复合纳米纤维膜吸附去除亚甲基蓝的影响,并研究了TiO2/活性炭复合纳米纤维膜的Zeta电位、接触角、光催化再生性能。结果表明:(1)静态吸附时,随着亚甲基蓝初始浓度增加,亚甲基蓝吸附去除率总体降低;TiO2/活性炭复合纳米纤维膜投加量、温度应根据实际情况综合考虑;TiO2/活性炭复合纳米纤维膜对溶液pH适应性强。(2)动态吸附时,TiO2/活性炭复合纳米纤维膜填充量增大,吸附穿透时间逐渐延长。(3)紫外光还是太阳光再生,TiO2/活性炭复合纳米纤维膜均具有很好的应用价值,且至少可以使用8次以上。(4)紫外光和太阳光再生1次后,TiO2/活性炭复合纳米纤维膜的接触角为131.54°,表现出很强的疏水特性,随着再生次数增加,接触角总体变小。

The batch removal of methylene blue from aqueous solutions by adsorption on self-made adsorbent（TiO2/activated carbon composite nano-fiber membrane） was investigated to determine the effects of adsorption treatment conditions（initial methylene blue concentration,adsorbent dosage,temperature and pH） on the adsorptive capacity for the dye.The Zeta potential,surface contact angle and photocalytic regeneration property of TiO2/activated carbon composite nano-fiber membrane were also investigated.Results showed that the removal of methylene blue decreased with increasing the initial dye concentration;the adsorbent dose and temperature should be considered according to the actual conditions;the TiO2/activated carbon composite nano-fiber membrane presented perfect adaptability to pH value.Large padding amount of adsorbent in dynamic adsorption experiments could prolong the breakthrough time.The synthesized nano-fiber membrane retained high photocatalytic regeneration activity even after 8 regeneration cycles,it could be regenerated by both solar or UV light.After regenerated for one time,surface contact angle of TiO2/activated carbon composite nano-fiber membrane was 131.54°,the surface contact angle was decreased gradually after few cycles of regeneration.