TY - JOUR
T1 - Synergistic effects of HSO5 − in the gamma radiation driven process for the removal of chlorendic acid
T2 - A new alternative for water treatment
AU - Shah, Noor S.
AU - Khan, Javed Ali
AU - Al-Muhtaseb, Ala'a H.
AU - Sayed, Murtaza
AU - Murtaza, Behzad
AU - Khan, Hasan M.
PY - 2016/12/15
Y1 - 2016/12/15
N2 - Removal of chlorendic acid, an emerging water pollutant and potential carcinogenic, was investigated by gamma radiation in the absence and presence of peroxymonosulfate (PMS, HSO5 −). The removal of chlorendic acid (1.40 μM initial concentration) by gamma radiation was promoted with PMS, i.e., 95% compared to 82% in the absence of PMS, at an absorbed dose of 1000 Gy. The removal of chlorendic acid by gamma-ray/PMS process was due to [rad]OH and SO4 [rad]−. Second-order rate constants of 5.90 × 109, 1.75 × 109, and 2.05 × 109 M−1 s−1 for chlorendic acid with eaq −, [rad]OH, and SO4 [rad]−, respectively, were determined. The removal efficiency of chlorendic acid was promoted with increasing initial PMS concentration and decreasing initial target contaminant concentration. The removal of chlorendic acid by gamma-ray/PMS was inhibited in the presence of CO3 2−, NO2 −, p-CBA, m-TA, and alcohols. The presence of Fe2+, Cu+, and Fe3+ with gamma-ray/PMS promoted removal efficiency of chlorendic acid from 78% to 99, 94, and 89%, respectively, at 592 Gy. The degradation of chlorendic acid by [rad]OH and SO4 [rad]− was found to be initiated at the carboxylate group as could be revealed from nature of the transformation by-products. Nevertheless, this study concluded that gamma-ray/PMS is of practical importance in treatment of natural water containing chlorendic acid, as potential detoxification of chlorendic acid solution can be revealed from 83% loss of chloride ion at 3000 Gy. In addition, gamma-ray/PMS process achieved efficient removal of chlorendic acid even in the presence of commonly found inorganic ions in natural water.
AB - Removal of chlorendic acid, an emerging water pollutant and potential carcinogenic, was investigated by gamma radiation in the absence and presence of peroxymonosulfate (PMS, HSO5 −). The removal of chlorendic acid (1.40 μM initial concentration) by gamma radiation was promoted with PMS, i.e., 95% compared to 82% in the absence of PMS, at an absorbed dose of 1000 Gy. The removal of chlorendic acid by gamma-ray/PMS process was due to [rad]OH and SO4 [rad]−. Second-order rate constants of 5.90 × 109, 1.75 × 109, and 2.05 × 109 M−1 s−1 for chlorendic acid with eaq −, [rad]OH, and SO4 [rad]−, respectively, were determined. The removal efficiency of chlorendic acid was promoted with increasing initial PMS concentration and decreasing initial target contaminant concentration. The removal of chlorendic acid by gamma-ray/PMS was inhibited in the presence of CO3 2−, NO2 −, p-CBA, m-TA, and alcohols. The presence of Fe2+, Cu+, and Fe3+ with gamma-ray/PMS promoted removal efficiency of chlorendic acid from 78% to 99, 94, and 89%, respectively, at 592 Gy. The degradation of chlorendic acid by [rad]OH and SO4 [rad]− was found to be initiated at the carboxylate group as could be revealed from nature of the transformation by-products. Nevertheless, this study concluded that gamma-ray/PMS is of practical importance in treatment of natural water containing chlorendic acid, as potential detoxification of chlorendic acid solution can be revealed from 83% loss of chloride ion at 3000 Gy. In addition, gamma-ray/PMS process achieved efficient removal of chlorendic acid even in the presence of commonly found inorganic ions in natural water.
KW - AOTs
KW - Chlorendic acid
KW - Gamma radiation
KW - PMS
KW - Water treatment
UR - http://www.scopus.com/inward/record.url?scp=84989352306&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84989352306&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2016.07.031
DO - 10.1016/j.cej.2016.07.031
M3 - Article
AN - SCOPUS:84989352306
SN - 1385-8947
VL - 306
SP - 512
EP - 521
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -