Highly active Pd–In/mesoporous alumina catalyst for nitrate reduction

Tin-palladium supported on alumina as a highly active and selective catalyst for hydrogenation of nitrate in actual groundwater polluted with nitrate

“…32 Sulfate ion and its reduced products, including SO3 2and HS -, formed under the reaction conditions, greatly decrease the reaction rate for NO3reduction over supported Cu-Pd catalysts. 32,37 Pd-based bimetallic catalysts, other than Cu-Pd, including Sn-Pd [19][20][21][22][23][24][27][28][29]34,35 and In-Pd [24][25][26][27][28]34 show activity towards the hydrogenation of NO3 -. The base metal sites in these catalysts have different affinities for coexisting ions in water from those of the Cu sites in Cu-Pd catalysts, and thus, the catalysts have strong potential to deliver superior performance in groundwater than Cu-Pd catalysts do.…”

Efficient electrocatalytic reduction of nitrate to nitrogen gas by a cubic Cu2O film with predominant (111) orientation

“…Because of the increasing consumption of fertilizers and discharge of industrial wastewater, nitrate contamination in both ground and surface water bodies has become a worldwide problem and induced great threats to the natural environment and public health, generating different types of problems like eutrophication, blue baby syndrome and gastrointestinal cancer. 1 To diminish this potential health risk, the concentration limit for NO 3 À in drinking water is set at 10 and 11.3 ppm by the United States EPA and the European Drinking Water Directive, respectively. 2,3 Therefore, various technologies have been developed to remove nitrate from water, such as microbial technology, 4 adsorption technology, 5 reverse osmosis technology, 6 electro-dialysis technology, 7 photocatalytic reduction technology, 8 chemical catalytic reduction technology, [9][10][11] and electrocatalytic reduction technology.…”

“…1 To diminish this potential health risk, the concentration limit for NO 3 À in drinking water is set at 10 and 11.3 ppm by the United States EPA and the European Drinking Water Directive, respectively. 2,3 Therefore, various technologies have been developed to remove nitrate from water, such as microbial technology, 4 adsorption technology, 5 reverse osmosis technology, 6 electro-dialysis technology, 7 photocatalytic reduction technology, 8 chemical catalytic reduction technology, [9][10][11] and electrocatalytic reduction technology. [11][12][13][14] Electrochemical denitrification can achieve the selective conversion of NO ) or nitrogen gas (N 2 ) and has been regarded as a promising method for NO 3 À removal due to its high efficiency, moderate operating conditions, relatively low investment costs, no sludge production, and high practicability for treating real nitrite wastewater.…”

Hybrid process for the purification of water contaminated with nitrites: Ion exchange plus catalytic reduction

“…Catalytic reduction of nitrates or nitrites using heterogeneous catalysts is an alternative to remove these species from polluted streams. In these technologies, nitrates or nitrites are reduced to nitrogen using a reducing agent, which is usually hydrogen [9][10][11][12]. However, this technology presents a major constraint, which is the catalyst selectivity.…”