活性炭表面性质对其吸附及氧化氢醌的影响

研究了活性炭表面性质对活性炭吸附及氧化氢醌的影响。考察了3种材质活性炭在不同初始pH下吸附和氧化氢醌的性能以及氢醌吸附率、表观转化率与活性炭材质及用量的关系。实验结果表明：活性炭可以吸附及氧化氢醌，木屑材质活性炭对氢醌的吸附及转化效果好于其他两种，在未调节初始pH，反应时间3 h，反应温度25℃，木屑质活性炭用量为0.5 g·L^-1时，对氢醌的吸附率可达95.5%；木屑质活性炭用量为0.1 g·L^-1，其对氢醌的表观转化率为32.1%。木屑质活性炭微孔面积更大，表面的酚羟基、羧基和羰基官能团更丰富，故其吸附及转化氢醌的效果更好。在此基础上，提出了活性炭吸附及氧化氢醌的机理，为活性炭作为吸附剂或催化剂载体处理废水中酚类有机污染物提供理论依据。

Effects of surface properties of activated carbon on its adsorption and oxidation of hydroquinone

The oxygen-containing functional groups and pore structures of activated carbon in adsorption and oxidation mechanism of hydroquinone were studied. Effects of initial pH value, the dosage of activated carbon, on the adsorption and oxidation efficiency of hydroquinone were studied. Then the relationship between adsorption rate, apparent conversion rate of hydroquinone and the materials of activated carbon, the dosage of activated carbon was discussed. The results showed that the oxygen-containing functional groups of activated carbon could adsorb and oxidate hydroquinone, wood-chip activated carbon was better than the other two types of activated carbon on the adsorption and oxidation efficiency of hydroquinone. Under the condition of not to adjust the initial pH, reaction time 3 h, and reaction temperature 25℃, if wood-chip activated carbon dosage was 0.5 g·L^-1 quality its base adsorption was 95.5% and if dosage was 0.1 g·L^-1 the conversion of hydroquinone was 32.1%. The microporous surface area of sawdust activated carbon was larger than the other two activated carbon's, and the phenol hydroxyl group, carboxyl group, and carbonyl group were more abundant. Therefore, the adsorption and oxidation efficiency of hydroquinone using sawdust activated carbon was better. On the basis of this, the mechanism of activated carbon adsorption and oxidation of hydroquinone were proposed. It provided the theoretical basis for the treatment of wastewater containing phenolic organic pollutants by activated carbon as adsorbent and catalyst carrier.