氧化石墨烯-零价铁-聚乙二醇-海藻酸钠凝胶球活化过硫酸钠降解水中的偏二甲肼

以海藻酸钠(SA)、聚乙二醇(PEG)、氧化石墨烯(GO)和零价铁(ZVI)为原料制备了氧化石墨烯-零价铁-聚乙二醇-海藻酸钠凝胶球(GZPS),用于活化过硫酸盐(PDS)降解水中的偏二甲肼(UDMH)。对GZPS进行了表征,并优化了GZPS的制备工艺。实验结果表明:对UDMH去除率影响因素的主次顺序为:w(PEG) w(SA)w(GO)w(ZVI);GZPS的最佳制备工艺为SA、PEG、GO、ZVI的质量分数分别为5%,3%,0.3%,2%;在UDMH质量浓度为100mg/L、PDS加入量为4mmol/L、GZPS加入量为60g/L、反应温度为35℃、反应时间为80 min的条件下,UDMH的去除率达85%以上。GZPS活化PDS降解UDMH的反应符合准一级动力学,Fe溶出量仅为Fe-GO-PDS体系的12.7%,重复使用4次后对UDMH的去除率仍在65%以上。

Degradation of unsym-dimethylhydrazine by sodium peroxydisulfate activated with graphene oxide-zero valent iron-polyethylene glycol-sodium alginate gel beads

Graphene oxide-zero-valent iron-polyethylene glycol-sodium alginate gel spheres （GZPS）were prepared using sodium alginate （SA）,polyethylene glycol （PEG）,graphene oxide （GO）and zero-valent iron （ZVI）as raw materials for degradation of unsymmetrical dimethylhydrazine （UDMH）in water by activated persulfate （PDS）. The GZPS was characterized and its preparation process was optimized. The experimental results showed that：The order of influencing factors on UDMH removal rate was w（PEG）> w（SA）> w（GO）> w（ZVI）;The optimum preparation process of GZPS was w（SA）5%,w（PEG）3%,w（GO）0.3% and w（ZVI）2%;The removal rate of UDMH was over 85% under the conditions of UDMH mass concentration 100 mg/L,PDS amount 4 mmol/L,GZPS amount 60 g/L,reaction temperature 35 ℃ and reaction time 80 min. The degradation of UDMH by GZPS-activated PDS followed the quasi-first-order kinetics. The amount of released Fe was only 12.7% of that of Fe-GO-PDS system. The removal rate of UDMH by GZPS-activated PDS after 4 reuses was still above 65%.