Description: In the present work, the iron-impregnated fly ash (Fe-FA) was used as an effective heterogeneous Fenton-like catalyst for the degradation of antibiotic in aqueous solutions. Effects of some key operating parameters such as (i) dose of hydrogen peroxide, (ii) catalyst dosage, (iii) pH on the treatment efficiency were investigated, optimized by response surface methodology, and discussed. Under the optimum conditions, the treatment efficiency for antibiotic of 95% was achieved within 120 min. Kinetics studies showed that the treatment of antibiotic on the catalyst follows a pseudo-second order reaction with the activation energy of about 17 kJ/mol.
Wastewater contains antibiotic has become a serious environmental problem, attracting more concerns in Vietnam and other countries. Antibiotic in aqueous solutions can be removed by different methods including physical, biological, and chemical techniques such as flocculation, coagulation, adsorption, membrane, and advanced oxidation processes (AOPs). Among the AOPs, Fenton process, which involves the generation of hydroxyl radical via a reaction between hydrogen peroxide and ferrous ion, is a promising method for the degradation of antibiotic since it can be operated under room temperature and pressure. However, the homogeneous Fenton technique has some significant disadvantages including (i) requirement for a large amount of chemicals, (ii) cost for a huge amount of sludge-containing ferric ions that need to be treated, and (iii) inactivation of ferrous ion by interacting with ions such as phosphate or some intermediate oxidation products in aqueous solutions. These disadvantages of the homogenous process can be overcome by the heterogeneous Fenton-like process, in which iron catalyst immobilized on a solid support are used. In contrast to the homogeneous Fenton process, the heterogeneous one provides the possibilities to recover and reuse solid catalysts and operate in broader pH range. Several iron-containing minerals and/or solid waste materials have been previously selected for preparing solid iron catalysts to reduce the preparation cost.
Organisation: Research Institute of Creative Education
Innovator(s): Hoang Chau Anh, Le Hoang Gia Khanh, Nguyen Thanh Long, Lam Binh Nguyen