TY - JOUR AU - Giang, Le Truong AU - Phuong, Dao Thi AU - Thuy, Quan Cam AU - Yen, Dao Hai PY - 2017/12/31 Y2 - 2024/03/29 TI - The contribution of free radicals in paracetamol degradation by UV/NaClO JF - Vietnam Journal of Chemistry JA - VJChem VL - 55 IS - 6 SE - Articles DO - 10.15625/2525-2321.2017-00532 UR - https://vjst.net/index.php/vjchem/article/view/2525-2321.2017-00532 SP - 720 AB - <p>UV/Chlorine is an emerging advanced oxidation process which forms several reactive species including <sup>•</sup>OH, <sup>•</sup>Cl, <sup>•</sup>OCl. This study investigated the contribution of three main free radicals: <sup>•</sup>OH, <sup>•</sup>Cl, <sup>•</sup>OCl on Paracetamol degradation under different conditions. Benzoic acid (BA), Nitro benzene (NB) and DMOB were used as probe compounds. The second rate constant of <sup>•</sup>OH, <sup>•</sup>Cl, <sup>•</sup>OCl with PRC were determined: 4.19 (±0.15) ×10<sup>9 </sup>M<sup>-1</sup>s<sup>-1</sup>; 3.71 10<sup>10</sup> M<sup>-1</sup>s<sup>-1</sup>; 3.532×10<sup>9</sup> M<sup>-1</sup>s<sup>-1</sup>, respectively. The formation of free radicals depends on pH. In particular, at pH 5: the contribution of <sup>•</sup>OH and     (<sup>-•</sup>OCl, <sup>•</sup>Cl) are 45 %, 41 %, respectively, at pH 8.5, the contribution of free radicals increases up to 63 %.</p> <p><strong>Keywords.</strong> Paracetamol, UV/Chlorine process, reactive species.</p> ER -