不同活性炭活化过硫酸盐的效能及机理的规律研究

选取煤质活性炭(F400D)、木质活性炭(Norit)和椰壳活性炭(Youshi)作为过硫酸盐(PS)活化剂,通过动力学实验研究了不同活性炭对过硫酸盐的活化效能及机理,考察了氯化钠和碳酸钠对活性炭/过硫酸盐体系的影响.结果表明,3种活性炭/过硫酸盐体系均可实现橙黄G的高效去除,效能略有差异,依次为:F400D/PSNorit/PSYoushi/PS.活性炭对染料的去除包括吸附作用和活化过硫酸盐的氧化降解作用,吸附位点与活化位点在活性炭上具有不同的分布.活性炭/过硫酸盐体系对1~100 mmol·L~(-1)氯化钠有很强的耐受作用,适用于高盐废水中有机污染物的去除.1~10 mmol·L~(-1)的碳酸钠对体系有明显的抑制作用.

Efficiency and mechanism of persulfate activation using different activated carbons

Three activated carbons, including coal carbon (F400D), wood carbon (Norit) and coconut carbon (Youshi) were selected as persulfate (PS) activators. Dynamic experiments to remove Orange G were conducted to investigate the activation efficiencies and mechanisms of these three carbon/PS systems. The effects of sodium chloride and sodium carbonate on the performances of the carbon/PS systems were also studied. The results showed that all the carbon/PS systems could remove Orange G effectively. The removal efficiency revealed small differences that F400D/PS > Norit/PS > Youshi/PS. Two processes, including the adsorption by activated carbon and oxidative degradation by activated persulfate, were confirmed to remove Orange G in a carbon/PS system. Activated carbon/PS system had a strong tolerance to sodium chloride (1~100 mmol·L^-1) and was therefore suitable for the removal of organic pollutants in high-salt wastewater. Nevertheless, sodium carbonate (1~10 mmol·L^-1) could suppress the Orange G degradation significantly.