Naslov
Performance of UV/acetylacetone process for saline dye wastewater treatment: Kinetics and mechanism

Autori
Yang, Fei ; Sheng, Bo ; Wang, Zhaohui ; Xue, Ying ; Liu, Jianshe ; Ma, Tianyi ; Bush, Richard ; Kušić, Hrvoje ; Zhou, Yanbo

Izvornik
Journal of hazardous materials (0304-3894) 406 (2021); 124774, 11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
reaction orders ; singlet oxygen ; AOX formation ; mineralization ; degradation pathway

Sažetak
Futility of traditional advanced oxidation processes (AOPs) in saline wastewater treatment has stimulated the quest for novel “halotolerant” chemical oxidation technology. Acetylacetone (AA) has proven to be a potent photo-activator in the degradation of dyes, but the applicability of UV/AA for saline wastewater treatment needs to be verified. In this study, degradation of crystal violet (CV) was investigated in the UV/AA system in the presence of various concentrations of exogenic Cl- or Br-. The results reveal that degradation, mineralization and even accumulation of adsorbable organic halides (AOX) were not significantly affected by the addition of Cl- or Br-. Rates of CV degradation were enhanced by elevating either AA dosage or solution acidity. An apparent kinetic rate equation was developed as r = -d[CV]/dt = k[CV]a[AA]b = (7.34 × 10-4 mM1-(a+b) min-1) × [CV]a=0.16 [AA]b=0.97. In terms of results of radical quenching experiments, direct electron/energy transfer is considered as the major reaction mechanism, while either singlet oxygen or triplet state (3(AA)*) might be involved. Based on identification of degradation byproducts, a possible degradation pathway of CV in the UV/AA system is proposed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti

POVEZANOST RADA