N-Doped TiO2: An Efficient Catalyst for the Photocatalytic Treatment of Water and Wastewater under Visible Light Irradiation

As a consequence of the rapid growth of population in urban areas, water use and reuse has become a major concern, leading to an urgent imperative to develop effective and affordable technologies for wastewater treatment.

Traditional methods for wastewater treatment are usually based on physical and biological processes but unfortunately, some organic pollutants, classified as bio-recalcitrant, are not biodegradable.

In this way heterogeneous photocatalysis may become an interesting water treatment technology to remove organic pollutants not treatable by conventional technique.

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Supercritical and Superheated Technologies: Future of Biodiesel Production

Awareness on global warming has led to greater emphasis on renewable energy as the next source of energy. Renewable energy sources such as biofuels, wind energy, hydroelectric power, geothermal and solar powers are the solutions for the world not to be excessively dependent on fossil fuels.

These renewable energy sources do not emit excessive harmful gases or particulates to the environmental. Instead, it has the potential to mitigate climate change and solve environmental pollution. Among these renewable energy sources, biofuels particularly biodiesel has been anticipated as the best alternative energy source in transportation sector.

Biodiesel has been receiving high attention from worldwide researchers because biodiesel is a good replacement fuels for fossil fuels. Biodiesel has low carbon emission and thus has minimal impact on environment. In addition, it also has similar chemical structure and energy content with fossil fuels.

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