geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Arsenic removal from water by coupling photocatalysis and complexation-ultrafiltration processes: A preliminary study


, : Arsenic removal from water by coupling photocatalysis and complexation-ultrafiltration processes: A preliminary study. Water Research 109(): 327-336

NlmCategory="UNASSIGNED">Inorganic As removal from contaminated water has been studied by off-line coupling of photocatalysis and complexation-ultrafiltration (CP-UF), showing that this combination permits to obtain a quite complete arsenic removal from the treated water. Two commercial polymers, poly(dimethylamine-coepichlorohydrin-coethylenediamine) (PDEHED) and poly(diallyl dimethyl amnmonium chloride) (PolyDADMAC) have been tested in the CP-UF process. The operating conditions (pH and polymer/As weight ratio) for As(V) complexation were determined finding values of 7.5/20 and 9.2/30 for PDEHED and polyDADMAC, respectively. The UF tests were performed by continuous diafiltration and diafiltration with volume reduction modes. The latter method permits to save the volume of washing solution during polymer regeneration. As(III) was not complexed, operating under the As(V) complexation conditions, thus a pre-oxidation step by using the photocatalytic approach was carried out to remove As(III) species. As(III) conversion to As(V) was evaluated by As speciation by using the CP-UF process for analytical purposes. Photocatalytic oxidation was successfully performed under UV radiation by using TiO2 (0.05 mg L-1), O2 and pH = 9. The oxidation was very fast during the first 10 min following a zero order kinetics (k = 0.83 mg L-1 min-1) and reaching 90% As(III) oxidation. A conceptual scheme coupling photocatalysis and CP-UF and some criteria to operate the CP-UF process, useful to address it towards application, are reported.

US$19.90

PMID: 27918996

DOI: 10.1016/j.watres.2016.11.054


Other references

Bugaeva, L.I.; Lebedeva, S.A.; Spasov, A.A., 2007: Effect of standardized solution of brine mineral bischofit (MgCl2 center dot 6H(2)O) on the antenatal development of rat fetus. A standard solution of mineral bischofit has low toxicity and produces a dose-dependent effect on the antenatal development of rat fetuses. Bischofit in a dose of 0.01ml/kg and 0.1ml/kg (daily requirement for magnesium ions) increased the index of...

Khan, N.L.; Katzenschlager, R.; Watt, H.; Bhatia, K.P.; Wood, N.W.; Quinn, N.; Lees, A.J., 2004: Olfaction differentiates parkin disease from early-onset parkinsonism and Parkinson disease. The authors studied whether olfactory dysfunction is present in parkin disease using the University of Pennsylvania Smell Identification Test (UPSIT). The mean UPSIT score in parkin patients was 27.3 (95% CI 24.4 to 30.2). This did not differ from...

Sands, David D., 1998: Reproductive behavior in sympatric Corydoras species sharing the same pigment pattern (Pisces, Callichthyidae, Siluriformes). Freshwater and: 160-163, 166, 168-170, 172

Molina Vicente, P., 1983: Cria en cautividad de la malvasia (Oxyura leucocephala) en el Parque Nacional de las Tablas de Daimiel. Boletin de la Estacion Central de Ecologia, 12: 57-62 No. 23

Hekman, M.; Baumann, M.; Köstler, M.; Heithier, H.; Münch, G.; Palm, D.; Helmreich, E.J., 1989: Interaction of components of the adenylate cyclase system in the course of hormonal signal transmission. Journal of Protein Chemistry 8(3): 404-405

Hierton C.; Blomgren G.; Lindgren U., 1983: Factors associated with heterotopic bone formation in cemented total hip prostheses. A series of 237 total hip replacements were analyzed by means of a computer program. High body weight and postoperative fever, as well as several indications of a technically demanding operation, occurred significantly more often in the group of p...

Ciccaglione, A.Rita.; Miceli, M.; Pisani, G.; Bruni, R.; Iudicone, P.; Costantino, A.; Equestre, M.; Tritarelli, E.; Marcantonio, C.; Tataseo, P.; Marazzi, M.Cristina.; Ceffa, S.; Paturzo, G.; Altan, A.Maria.Doro.; San Lio, M.Magnano.; Mancinelli, S.; Ciccozzi, M.; L.P.esti, A.; Rezza, G.; Palombi, L., 2010: Improving HIV-2 detection by a combination of serological and nucleic acid amplification test assays. The ability to detect HIV-2 and to discriminate between HIV-1 and HIV-2 infections was evaluated in 46 serum samples from Guinea-Bissau (GB) and Guinea-Conakry (GC) using serological tests and commercial (HIV-1) and in-house (HIV-2) real-time PCR...

Fedde, M.R., 1976: Intrapulmonary CO2 receptors in the duck: IV. Discharge pattern of the population during a respiratory cycle. We used single-unit vagal recordings to study the average discharge pattern during a respiratory cycle from 57 intrapulmonary CO2 receptors in 6 ducks artificially ventilated with a Starling pump. Peak discharge frequency occurred during inspirati...

Bitter, K., 1974: Immunity suppression by bleomycin-methotrexate combined treatment in patients with epidermoid carcinoma of the oral cavity. Journal of Maxillofacial Surgery 2(1): 35-39

Jedenius, E.; Wimo, A.; Strömqvist, J.; Andreasen, N., 2008: A Swedish programme for dementia diagnostics in primary healthcare. To meet diagnostic needs of dementia, a new care programme was implemented in the county of Kalmar, Sweden. The objective of the study was to analyse whether the programme could identify and diagnose the estimated number of new cases. A long-term...