氮掺杂碳纳米管活化过硫酸盐降解丁基黄药

Degradation of butyl xanthate using persulfate activated with nitrogen-doped carbon nanotube

采用氮掺杂碳纳米管(N-CNT)作为活化剂活化过硫酸钠(SPS)降解丁基黄药。考察了N-CNT加入量、SPS质量浓度、共存阴离子和腐殖酸(HA)对丁基黄药降解的影响。实验结果表明:N-CNT作为一种非金属活化剂,可以高效地活化SPS降解丁基黄药,在丁基黄药质量浓度为200 mg/L、N-CNT加入量为0.40 g/L、SPS浓度为0.50 mmol/L、pH=7时,降解80 min后丁基黄药可被完全去除;共存HA会抑制丁基黄药的降解,抑制作用随着HA浓度的增大而增大;Cl-、HCO3-和SO42-对丁基黄药的降解有一定的抑制作用;N-CNT活化SPS降解丁基黄药的过程中,自由基机制和非自由基机制共同作用导致了丁基黄药的降解,并且非自由基机制占主导。

Nitrogen-doped carbon nanotube(N-CNT)was used as an activator to activate sodium persulfate(SPS)to degrade butyl xanthate.The effects of N-CNT dosage,SPS mass concentration,coexisting anions and humic acid(HA)were investigated.The experiment results indicate that:As a nonmetal catalyst,CNT can effectively activate PS to degrade butyl xanthate,and butyl xanthate can be degraded completely within 80 min under the conditions of butyl xanthate mass concentration 200 mg/L,N-CNT dosages 0.40 g/L,SPS concentration 0.5 mmol/L and pH 7;Co-existing HA can inhibit the degradation of butyl xanthate,and the inhibitory effect increased with the increasing of HA concentration;In addition,the presence of Cl-,HCO3-have a slightly inhibitory effect on butyl xanthate degradation;In the process,both the radical and the non-radical mechanism are involved,and the non-radical mechanism is dominated.