Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

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Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

Yi Wang - Nama Orang; Yuichi Kamiya - Nama Orang; Yoshinori Sakamoto - Nama Orang;

Abstract.
Catalytic reduction of nitrate (NO3-) in groundwater over a Cu–Pd catalyst supported on active carbon
was investigated in a gas–liquid co-current flow system at 298 K. Although Cu–Pd/active carbon, in
which the Cu/Pdmolar ratio was more than 0.66, showed high activity, high selectivity for the formation
of N2 and N2O (98%), and high durability for the reduction of 100 ppm NO3- in distilled water, the
catalytic performance decreased during the reduction of NO3- in groundwater. The catalyst also irreversibly deactivated during the reaction in groundwater. The organic species in the groundwater caused the decrease in the catalytic performance and the irreversible catalyst deactivation. Ozonetreatment of the groundwater to remove the organic species substantially helped to maintain the catalytic activity and to halt the irreversible deactivation of the catalyst. Chloride ion (Cl-) in the groundwater also caused the decrease in the activity and selectivity, but the effects of Cl- were reversible. Sulfate ion (SO42-) and cations, including Mg2+, Ca2+ and K+, had little or no effect on the catalytic performance of Cu–Pd/active carbon, though they were present in the groundwater sample.More than an allowable level of NH3 (NH4+) was formed during the catalytic reduction of NO3- in the groundwater, but was completely removed by the cation-exchange process using Na-mordenite.

Keywords: Nitrate, Groundwater, Catalytic reduction, Copper–palladium bimetal catalyst, Humic acid, Ion-exchange

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Informasi Detail

Judul Seri: Applied Catalysis A: General
No. Panggil: -
Penerbit: London : Elsevier B.V.., 2009
Deskripsi Fisik: Applied Catalysis A: General 361 (2009) 123–129
Bahasa: English
ISBN/ISSN: -
Klasifikasi: -
Tipe Isi: -
Tipe Media: -
Tipe Pembawa: -
Edisi: -
Subjek: KIMIA
Info Detail Spesifik: -
Pernyataan Tanggungjawab: agus

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Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

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