摘要
利用石墨烯在一定条件下形成凝胶的特性,采用水热法原位掺杂金属离子(Ag~+、Cu~(2+)、La~(3+))制备了掺杂金属石墨烯基水凝胶(AgGH、CuGH、LaGH)。该水凝胶对染料表现出良好的光降解能力。金属掺杂石墨烯基水凝胶降解罗丹明的速度遵循LaGH>CuGH>AgGH的顺序。光解试验表明,La~(3+)掺杂LaGH的最佳浓度为2 mmol/L。XRD和FTIR表征说明,经过水热反应后,LaGH中出现了镧的氧化物和氢氧化物。该水凝胶循环5次后仍能保持较好的光解染料的能力。淬灭试验表明,光照条件下掺杂金属石墨烯基水凝胶表面产生的空穴和超氧化物是分解染料的主要活性基团。
Based on the aerogel forming property of graphene, metal-doped graphene hydrogel(AgGH,CuGH, LaGH) are prepared by adding metal ions(Ag~+、Cu~(2+)、La~(3+)) in situ using hydrothermal method. The hydrogels feature good photodegradability. The degradation rate to Rhodamine of metal-doped grapheme hydrogel(MGH) follows the sequence of LaGH>CuGH>AgGH. The optimum doping concentration of La~(3+)is 2 mmol/L. XRD and FTIR illustrate that La(OH)_3 and La_2O_3 appeare in LaGH. The hydrogel remains a good photodegradability to decompose dye after 5 cycles. Trapping experiment suggests that h~+ and O·~(2-) are the prominent radical groups.
引文
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