Volume 5, Issue 3 (21 2012)
ijhe 2012, 5(3): 307-318 |
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Parastar S, Nasseri S, Mahvi A H, Gholami M, Javadi A H, Hemmati S. Photocatalytic Reduction of Nitrate in Aqueous Solutions using Ag-doped TiO2/UV Process. ijhe 2012; 5 (3) :307-318
URL: http://ijhe.tums.ac.ir/article-1-13-en.html
URL: http://ijhe.tums.ac.ir/article-1-13-en.html
Saeed Parastar 
, Simin Nasseri * 1, Amir Hossein Mahvi , Mitra Gholami , Amir Hossein Javadi , Saeedeh Hemmati
, Simin Nasseri * 1, Amir Hossein Mahvi , Mitra Gholami , Amir Hossein Javadi , Saeedeh Hemmati
1- , naserise@tums.ac.i
Abstract: (12104 Views)
Background and Objectives: Pollution of water resources to nitrate is an
environmental problem in many parts of the world. This problem possibly causes
diseases such as methemoglobinemia, lymphatic system cancer and Leukemia.
Hence, nitrate control and removal from water resources is necessary.
Considering that application of nanomaterials in treatment of environmental pollutants
has become an interesting method, in this research use of Ag-doped TiO2 nanoparticles synthesized through photodeposition produced under UV irradiation
was studied for removal of nitrate from aqueous solutions.
Materials and Methods: Three nitrate concentrations of 20, 50, and 100 mg/L were considered. In order to determine the effect of Ag-doped TiO2 nanoparticles on nitrate removal, dosages of 0.1, 0.4, 0.8 and 1.2 g/L nanoparticles were used pH range of 5-9 was also considered. The effect of Ag-doped TiO2 nanoparticles both in darkness and under UV irradiation was studied. Moreover, the presence of chloride and sulfate anions on the system removal efficiency was investigated.
Results: The optimum performance of nitrate removal (95.5%) was obtained using nitrate concentration of 100 mg/L, in acidic pH and 0.8 g/L Ag-TiO2. Increase of nanoparticle dosage up to 0.8 g/L, increased the removal efficiency, but for 1.2 g/L dosage of nanoparticles, the removal efficiency decreased. Maximum reduction performance without nanoparticles, under UV irradiation and under darkness conditions were 32% and 23.3% , respectively. In addition, we found that presence of sulfate and chloride anions in aqueous solution reduced efficiency of nitrate removal.
Conclusion: Results of this study showed that Ag-doped TiO2 nanoparticles may be efficiently used for nitrate removal from aqueous solutions.
Materials and Methods: Three nitrate concentrations of 20, 50, and 100 mg/L were considered. In order to determine the effect of Ag-doped TiO2 nanoparticles on nitrate removal, dosages of 0.1, 0.4, 0.8 and 1.2 g/L nanoparticles were used pH range of 5-9 was also considered. The effect of Ag-doped TiO2 nanoparticles both in darkness and under UV irradiation was studied. Moreover, the presence of chloride and sulfate anions on the system removal efficiency was investigated.
Results: The optimum performance of nitrate removal (95.5%) was obtained using nitrate concentration of 100 mg/L, in acidic pH and 0.8 g/L Ag-TiO2. Increase of nanoparticle dosage up to 0.8 g/L, increased the removal efficiency, but for 1.2 g/L dosage of nanoparticles, the removal efficiency decreased. Maximum reduction performance without nanoparticles, under UV irradiation and under darkness conditions were 32% and 23.3% , respectively. In addition, we found that presence of sulfate and chloride anions in aqueous solution reduced efficiency of nitrate removal.
Conclusion: Results of this study showed that Ag-doped TiO2 nanoparticles may be efficiently used for nitrate removal from aqueous solutions.
Type of Study: Research |
Subject:
General
Received: 2012/03/2 | Accepted: 2012/04/28 | Published: 2013/07/10
Received: 2012/03/2 | Accepted: 2012/04/28 | Published: 2013/07/10
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