The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide
The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide
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DOI：
10.1016/j.carbon.2013.06.001
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发表时间：
2013-10
期刊：
影响因子：
10.9
通讯作者：
R. Ribeiro;Adrián M. T. Silva;J. Figueiredo;J. Faria;H. Gomes
中科院分区：
文献类型：
--
作者：
R. Ribeiro;Adrián M. T. Silva;J. Figueiredo;J. Faria;H. Gomes
具有不同结构和化学性质的碳材料，即活性炭、碳干凝胶、碳纳米管、氧化石墨烯、石墨和基于甘油的碳材料，在不同的操作条件下测试它们在水溶液中催化过氧化氢（H2O2）分解的能力。用浓硫酸（ACS）处理的活性炭在大多数研究条件下是H2O2分解的最活跃的催化材料，这是由于其表面存在含硫官能团。此外，ACS被证明是一个稳定的催化剂，在重复利用试验H2O2分解。甲醇被用来作为选择性清除剂的羟基自由基（HO自由基点），显示活性炭具有显着的碱性字符导致HO自由基点形成的H2O2分解过程中的最高收率（14%，反应150分钟后）。总的来说，从H2O2分解的机理解释，可以得出结论，在活性炭表面的含硫官能团的存在下，提高了水溶液中的H2O2的去除，但另一方面，通过HO自由基dotformation的选择性分解的H2O2通过活性炭表面上的碱性活性位点的存在下增强。
Carbon materials with different structural and chemical properties, namely activated carbons, carbon xerogels, carbon nanotubes, graphene oxide, graphite and glycerol-based carbon materials, were tested under different operating conditions for their ability to catalyse hydrogen peroxide (H2O2) decomposition in aqueous solutions. Activated carbons treated with concentrated sulphuric acid (ACS) are the most active catalytic materials for H2O2decomposition in most of the conditions studied, due to the presence of sulphur containing functional groups at their surface. In addition, ACS proved to be a stable catalyst in reutilization tests for H2O2decomposition. Methanol was used as selective scavenger of hydroxyl radicals (HOradical dot), to show that activated carbons with a markedly basic character lead to the highest yield of HOradical dotformed during the H2O2decomposition process (14%, after 150 min of reaction). Overall, from the mechanistic interpretation of H2O2decomposition, it is concluded that the presence of sulphur containing functional groups at the surface of the activated carbons improves the removal of H2O2in aqueous solutions, but, on the other hand, the selective decomposition of H2O2via HOradical dotformation is enhanced by the presence of basic active sites on the carbon surface.