GO/CMC复合吸收剂吸收处理高浓度偏二甲肼废液研究

Study on the absorption of GO/CMC composite absorbent for the treatment of high concentration unsymmetrical dimethylhydrazine wastewater

以氧化石墨烯(GO)和羧甲基壳聚糖(CMC)为原料,采用溶液共混法制备了GO/CMC复合吸收剂,并通过FTIR、Raman、SEM、TEM和TG-DTG对吸收剂进行表征。结果表明,GO/CMC中存在大量羧基和环氧基,GO和CMC复合情况较好。偏二甲肼(UDMH)废液吸收处理性能受到吸收剂组成、添加氧化剂和无机相变材料的影响。当GO添加量为10%时,吸收剂吸收处理效果最佳。氧化剂Ca(ClO)_(2)可以与UDMH发生较为剧烈的氧化还原反应,掺杂吸收剂后,反应剧烈程度得到有效缓解。当添加0.5 g 10%GO/CMC和2.5 g Ca(ClO)_(2)时,吸收氧化效果最佳,UDMH气体挥发最大浓度仅为58.69 mg/m^(3)。此外,添加无机相变材料后,体系温度和UDMH气体挥发最大浓度得到进一步降低。GO/CMC复合吸收剂可为高浓度UDMH废液的应急吸收处理提供有益探索。

The GO/CMC composite absorbent was prepared by the solution-blending method using graphene oxide(GO) and carboxymethyl chitosan(CMC) as raw materials and characterized by FTIR,Raman, SEM,TEM,and TG-DTG.The results show that a large number of carboxyl and epoxy groups are present in GO/CMC and that GO and CMC are well compounded.The performance of the absorption treatment of unsymmetrical dimethylhydrazine(UDMH) wastewater is influenced by the composition of the absorbent, the addition of oxidizing agents, and inorganic phase change materials.Absorbent absorption treatment is most effective when GO is added at 10%.The oxidizing agent Ca(ClO)_(2)can undergo a more violent redox reaction with UDMH.The reaction intensity is effectively mitigated by the doping of absorbents.When 0.5 g of 10% GO/CMC and 2.5 g of Ca(ClO)_(2)were added, the maximum concentration of volatilized UDMH gas was only 58.69 mg/m^(3).Furthermore, the addition of inorganic phase change materials further reduces the system temperature and the maximum concentration of volatile UDMH gas.The GO/CMC composite absorbent can provide a useful exploration for the emergency absorption treatment of high concentration UDMH wastewater.