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Barlah Rumhayati
Department of Chemistry, Brawijaya University, Jl. Veteran, Malang 65145
Chemical Engineering, Chemistry & Bioengineering Chemistry

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PHOSPHATE AND NITRATE REMOVAL FROM DRINKING WATER SOURCES USING ACRYLAMIDE-FERRIHYDRITE GEL Barlah Rumhayati; Chasan Bisri; Heni Kusumawati; Faridah Yasmin
Indonesian Journal of Chemistry Vol 12, No 3 (2012)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.107 KB) | DOI: 10.22146/ijc.21344

Abstract

Phosphate and nitrate ions removal from drinking water has been conducted using acrylamide-ferrihydrite gel. The gel was prepared by mixing the ferrihydrite paste and acrylamide gel solution followed by casting at temperature 42-46 °C for at least one hour. The effect of pH and concentration of phosphate and nitrates to the percent of removal were investigated. Desorption efficiency was also investigated using sulphuric acid at various concentration. As a result, phosphate and nitrate could be removed optimally at pH 5. The solution concentration of nitrate for optimum removal was 10 mg/L NO3-, whilst phosphate could be removed optimally at concentration of 0.3 mg/L PO43-. The analytes could be desorbed from the gel using H2SO4 0.3 M. In application, phosphate and nitrate in the drinking water sources could be removed up to 70%.
THE PERFORMANCE OF CHITOSAN-FERRIHIDRYTE MEMBRANE FOR PHOSPHATE UPTAKE Barlah Rumhayati; Chasan Bisri; Wahyu O. Fajarina
Indonesian Journal of Chemistry Vol 9, No 3 (2009)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (112.773 KB) | DOI: 10.22146/ijc.21506

Abstract

The uptake of orthophosphate onto the chitosan-ferrihydrite membrane has been studied. The membrane was proposed as a new binding layer of DGT technique. Membrane was prepared from a mixture of chitosan solution with ferrihydrite (FeOOH) paste and was crosslinked with glutaraldehyde. As a result, the uptake of orthophosphate was slow. The maximum adsorption capacity was reached at pH 5.0 and 8.0. It was mainly due to electrostatic attraction of phosphate ions to the protonated free amino groups of chitosan and to active sites of ferrihydrite. Desorption could be occurred optimally using 0.3 M of sulphuric acid. The absorption of SO42- ion to the protonated amino groups and the formation of ionic crosslinking could exchange and desorb phosphate ions. Ferrihydrite was eluted also by the acid. However, the eluted ferrihydrite readsorbed phosphate ions, resulted in minimizing the analysed free phosphate.
Co-Authors Chasan Bisri Faridah Yasmin Wahyu O. Fajarina