Recent advancements in g-CN-based photocatalysts for photocatalytic CO reduction: a mini review.

Carbon dioxide (CO) is a very important micro-molecular resource. Using CO captured from the atmosphere for high-output synthesis of chemicals as raw materials has great significance and potential for various industrial applications. Since the industrial revolution in the 18 century, manmade CO emission has increased by 45%, which negatively impacts the planetary climate by the so-called greenhouse effect.

Removal of Hg(ii) in aqueous solutions through physical and chemical adsorption principles.

Adsorption has been the focus of research on the treatment of heavy metal mercury pollution since it is among the most toxic heavy metals in existence. The US EPA has set a mandatory discharge limit of 10 μg Hg L for wastewater and for drinking water a maximum accepted concentration of 1 μg Hg L. Physical adsorption and chemical adsorption are the two major mechanisms of adsorption methods used for mercury removal in aqueous sources.

Improved DBP elimination from swimming pool water by continuous combined UV and ozone treatment.

Chlorine is the most frequently used disinfectant and oxidant for maintaining swimming pool water quality; however, it reacts continuously with dissolved organic matter to produce disinfection by-products (DBPs), which are a health risk for pool users. UV treatment is used widely to remove chloramines, which are the most prevalent group of DBPs, albeit chloro-organic DBP concentrations often increase during post-UV chlorination. In this work, UV and ozone treatments were investigated as additional technologies to eliminate DBP formation and their precursors.

Effect of medium-pressure UV-lamp treatment on disinfection by-products in chlorinated seawater swimming pool waters.

Several brominated disinfection by-products (DBPs) are formed in chlorinated seawater pools, due to the high concentration of bromide in seawater. UV irradiation is increasingly employed in freshwater pools, because UV treatment photodegrades harmful chloramines. However, in freshwater pools it has been reported that post-UV chlorination promotes the formation of other DBPs.

Combined UV treatment and ozonation for the removal of by-product precursors in swimming pool water.

Both UV treatment and ozonation are used to reduce different types of disinfection by-products (DBPs) in swimming pools. UV treatment is the most common approach, as it is particularly efficient at removing combined chlorine. However, the UV treatment of pool water increases chlorine reactivity and the formation of chloro-organic DBPs such as trihalomethanes.