UV-LED/NaClO工艺对水中对乙酰氨基酚的降解

采用NaClO、UV-LED和UV-LED/NaClO工艺去除水中的对乙酰氨基酚（AAP），考察了NaClO投加量、pH值和腐殖酸（HA）等因素对UV-LED/NaClO工艺去除AAP的影响，研究了UV-LED/NaClO去除AAP过程中OH·、UV-LED、NaClO和氯自由基RCS（Cl·，Cl₂^·-，ClO·）的贡献值，评估了AAP降解过程中溶液急性毒性的变化.结果表明，UV-LED/NaClO可以有效降解.AAP.反应90min后，UV-LED、NaClO和UV-LED/NaClO工艺对AAP的去除率分别为4.42%、93.61%和100%.AAP的降解符合拟一级反应动力学模型（R²=0.9967）.AAP的去除随着NaClO投加量的增大而增加，中性条件有利于AAP的降解，HA对AAP去除具有抑制作用，HCO₃^-和NO₃^-可略微促进AAP的去除.当NaClO投加量为1mg/L，OH·、UV-LED、NaClO和RCS各组分对AAP去除的相对贡献率分别为0.82%、0.66%、33.78%和64.74%，UV-LED/NaClO工艺可以有效的降低溶液的急性毒性.

Degradation of acetaminophen in aqueous by UV-LED/NaClO process

The degradation of acetaminophen (AAP) in aqueous solution by NaClO, UV-LED and UV-LED/NaClO was investigated, the influences of several factors such as NaClO dosage, pH values and humic acid (HA) on AAP degradation by UV-LED/NaClO process were discussed. Contributions of hydroxyl radical (OH·), UV-LED irradiation, NaClO and free chlorine radical RCS(Cl, Cl₂^·-, ClO·) AAP degradation also studied. Variation of acute toxicity of reacted solution was evaluated. The results indicated that AAP was removed effectively during UV-LED/NaClO process. After reaction of 90min, UV-LED irradiation, NaClO and UV-LED/NaClO processes for AAP removal were found to be 4.42%, 93.61% and 100%, respectively. The AAP degradation well fitted with the pseudo-first-order kinetics model (R²=0.9967). The removal of AAP increased with the increasing of NaClO dosage, neutral condition was conducive to AAP degradation. AAP removal was inhibited in the presence of HA. HCO₃^- and NO₃^- could slightly promote the removal of AAP. When the dosage of NaClO was 1mg/L, the relative contribution rates of OH·, UV-LED, NaClO and RCS radicals in the degradation of AAP were 0.82%, 0.66%, 33.78% and 64.74%, respectively. The UV-LED/NaClO process can decrease the acute toxicity of the solution effectively.