The purification and the reuse of industrial wastewaters is a very critical environmental issue due to a global freshwater shortage, a continuing water resources depletion and increasing pollutants release in the environment. This is evident taking into account that currently ca. 90% of the global freshwater availability is destined to industrial and agricultural consumptions, while 1 billion people globally lack access to safe water supplies and more than 2 billion are without access to basic sanitation (WHO and the UNICEF, 2017). The improvement of the quality of drinking water and the reduction of water contamination are very challenging issues, worthy of a global market of hundreds of billions of euro, growing at about 6% of rate (Royan, 2016). Moreover, increased industrial output in emerging markets are expected to drive global water market growth, while the investments in technologies to improve efficiency and to facilitate reuse will continue to increase. Furthermore, the transformation of linear economy in circular economy, wherein wastage is minimal and resources are reused, will change the nature of technologies and solutions used in water and wastewater management (Royan, 2016). Recently, a new class of cerium manganate nano-composite materials has been synthesized through an innovative preparation method [1] and proved in the catalytic depollution of air contaminants and noxious industrial wastewater [1-5], providing new technological solutions especially for the industrial water management based on Reduction, Reuse and Recycle [1-5]. The high red-ox activity, surface amphoteric behaviour and good chemical stability render these new advanced materials more performing with respect to supported noble-metals catalysts [1-5]. The new synthesis technique leads to cerium manganate nanocomposite materials with improved mesoporous texture and quasi-molecular dispersion of the oxide phases, enhancing the oxidation activity in comparison to the conventional co-precipitation route [1-5]. The method is eco-friendly, easily and economically feasible on small and large scale, ensuring high reproducibility and control of the catalyst structure and texture. The technique has been exploited to obtain bulk and promoted systems very active in the water electro-oxidation, CO oxidation reactions [1-5], soot oxidative abatement, NO decomposition and low temperature NOx selective reduction and in particular the conversion (adsorption) and the mineralization (total oxidation) of different classes of polluting substrates, including aromatic compounds (i.e., phenols), low molecular weight (C1-C3) carboxylic acids, and Cl- and N- containing organic pollutants. Therefore, the effectiveness and efficiency of a new technological approach based on catalytic wet oxidation processes for the detoxification of very polluted industrial wastewaters been assessed, toward different classes of polluting substrates incompatible with biological treatments.
Advanced cerium manganate nano-composite catalytic materials for pollution control
L Spadaro;A Palella;F Arena
2018
Abstract
The purification and the reuse of industrial wastewaters is a very critical environmental issue due to a global freshwater shortage, a continuing water resources depletion and increasing pollutants release in the environment. This is evident taking into account that currently ca. 90% of the global freshwater availability is destined to industrial and agricultural consumptions, while 1 billion people globally lack access to safe water supplies and more than 2 billion are without access to basic sanitation (WHO and the UNICEF, 2017). The improvement of the quality of drinking water and the reduction of water contamination are very challenging issues, worthy of a global market of hundreds of billions of euro, growing at about 6% of rate (Royan, 2016). Moreover, increased industrial output in emerging markets are expected to drive global water market growth, while the investments in technologies to improve efficiency and to facilitate reuse will continue to increase. Furthermore, the transformation of linear economy in circular economy, wherein wastage is minimal and resources are reused, will change the nature of technologies and solutions used in water and wastewater management (Royan, 2016). Recently, a new class of cerium manganate nano-composite materials has been synthesized through an innovative preparation method [1] and proved in the catalytic depollution of air contaminants and noxious industrial wastewater [1-5], providing new technological solutions especially for the industrial water management based on Reduction, Reuse and Recycle [1-5]. The high red-ox activity, surface amphoteric behaviour and good chemical stability render these new advanced materials more performing with respect to supported noble-metals catalysts [1-5]. The new synthesis technique leads to cerium manganate nanocomposite materials with improved mesoporous texture and quasi-molecular dispersion of the oxide phases, enhancing the oxidation activity in comparison to the conventional co-precipitation route [1-5]. The method is eco-friendly, easily and economically feasible on small and large scale, ensuring high reproducibility and control of the catalyst structure and texture. The technique has been exploited to obtain bulk and promoted systems very active in the water electro-oxidation, CO oxidation reactions [1-5], soot oxidative abatement, NO decomposition and low temperature NOx selective reduction and in particular the conversion (adsorption) and the mineralization (total oxidation) of different classes of polluting substrates, including aromatic compounds (i.e., phenols), low molecular weight (C1-C3) carboxylic acids, and Cl- and N- containing organic pollutants. Therefore, the effectiveness and efficiency of a new technological approach based on catalytic wet oxidation processes for the detoxification of very polluted industrial wastewaters been assessed, toward different classes of polluting substrates incompatible with biological treatments.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.