Your browser doesn't support javascript.
loading
Kinetic study on methylene blue removal from aqueous solution using UV/chlorine process and its combination with other advanced oxidation processes.
Hoang, Nguyen Tien; Manh, Tran Duc; Nguyen, Vo Thang; Thy Nga, Nguyen Thi; Mwazighe, Fredrick M; Nhi, Bui D; Hoang, Hien Y; Chang, S Woong; Chung, W Jin; Nguyen, D Duc.
Afiliación
  • Hoang NT; The University of Da Nang, University of Science and Education, 459 Ton Duc Thang st., Lien Chieu, Da Nang 550000, Viet Nam. Electronic address: nthoang@ued.udn.vn.
  • Manh TD; The University of Da Nang, University of Science and Education, 459 Ton Duc Thang st., Lien Chieu, Da Nang 550000, Viet Nam.
  • Nguyen VT; The University of Da Nang, University of Science and Education, 459 Ton Duc Thang st., Lien Chieu, Da Nang 550000, Viet Nam.
  • Thy Nga NT; The University of Da Nang, University of Science and Education, 459 Ton Duc Thang st., Lien Chieu, Da Nang 550000, Viet Nam.
  • Mwazighe FM; Department of Chemistry, Faculty of Science and Technology, University of Nairobi, P. O. Box 30197, 00100, Nairobi, Kenya.
  • Nhi BD; Faculty of Chemical and Environmental Technology, Viet Tri University of Industry, Phu Tho, Viet Nam. Electronic address: nhibd@vui.edu.vn.
  • Hoang HY; Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Danang, 550000, Viet Nam; The Faculty of Environmental and Chemical Engineering, Duy Tan University, 03 Quang Trung, Danang, 550000, Viet Nam.
  • Chang SW; Department of Environmental Energy Engineering, Kyonggi University, 442-760, Republic of Korea.
  • Chung WJ; Department of Environmental Energy Engineering, Kyonggi University, 442-760, Republic of Korea.
  • Nguyen DD; Department of Environmental Energy Engineering, Kyonggi University, 442-760, Republic of Korea; Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, 300A Nguyen Tat Thanh, District 4, HCM City, 755414, Viet Nam. Electronic address: nguyensyduc@gmail.com.
Chemosphere ; 308(Pt 3): 136457, 2022 Dec.
Article en En | MEDLINE | ID: mdl-36116628
This study investigated the kinetic degradation of methylene blue (MB) by a UV/chlorine process and its combination with other advanced oxidation processes. The ∙OH and reactive chlorine species (RCS: Cl∙, ClO∙, etc.) were the primary reactive species, which accounted for 56.7% and 37.6% of MB degradation at pH 7, respectively. The second-order rate constant of Cl∙ towards MB was calculated to be 2.8 × 109 M-1 s-1. When the pH increased from 3 to 7, kMB by ∙OH increased from 0.15 to 0.21 min-1 before being reduced to 0.11 min-1 at pH 11. kMB by RCS continuously reduced from 0.16 to 0.13 min-1 when the pH was increased to 11. Humic acid (HA), Br-, and Cl- inhibited the degradation with kMB in the order: kMB (in HA) < kMB (in Br-) < kMB (in Cl-). HCO3- increased kMB from 0.37 to 0.48 min-1. The experimental and modeling methods fit well, indicating the effectiveness of using Kintecus® in predicting concentrations of free radicals in complex water matrices. TOC removal was achieved at 60% after 30 min in a control process and it was strongly inhibited by the presence of HA, with 22% removal achieved at 5 mgc L-1 HA. UV/chlorine/electrochemical oxidation (UV/chlorine/EO) significantly improves kMB from 0.37 to 0.94 min-1 at a high current (240 mA), while UV/chlorine/H2O2 decreased kMB at a low concentration of 0.01 mM H2O2 (kMB decreased by 6.1%). The results indicate that the energy cost for UV irradiation was the main cost in MB treatment in both UV/chlorine and UV/persulfate (UV/PS) processes, accounting for 91% and 84%, respectively.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Purificación del Agua Tipo de estudio: Prognostic_studies Idioma: En Revista: Chemosphere Año: 2022 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Purificación del Agua Tipo de estudio: Prognostic_studies Idioma: En Revista: Chemosphere Año: 2022 Tipo del documento: Article Pais de publicación: Reino Unido