Arsenic removal from water/wastewater using adsorbents—A critical review

Application of titanium dioxide in arsenic removal from water: A review

Possible treatments for arsenic removal in Latin American waters for human consumption

The subject of this report is chemistry and engineering for the application of heterogeneous photocatalysts. The state of the art in catalysts are forms of titanium dioxide or modifications thereof, but work on other heterogeneous catalysts is included.

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Bibliography of Work on the Heterogeneous Photocatalytic Removal of Hazardous Compounds from Water and Air

Widespread concerns continue to be raised about the increasing presence of emerging contaminants in the environment. Such compounds include a wide range of persistent organic chemicals, including pharmaceuticals and endocrine-disrupting compounds whose effects are poorly known, often because they have only begun to enter the environment and are showing up in wastewater treatment plants. The occurrence and behavior of these compounds in wastewater are key issues with regard to water reclamation and reuse. Treatment plants are now faced with the challenge of removing the compounds from their effluent before they enter natural waterways. In this regard, photocatalysis is a promising technology for wastewater treatment that offers many advantages over conventional and some advanced treatment options. The application of photocatalysis for the removal of pharmaceuticals and endocrine-disrupting compounds for wastewater is comprehensively surveyed in this paper. This treatment technology is not intended to replace conventional systems but to supplement for higher-quality effluent. The assessment places emphasis on the process fundamentals, advantages, and disadvantages of the technology. It also focuses on the current limitations and future research needs. Copyright © 2007 Society of Chemical Industry

Removing pharmaceuticals and endocrine‐disrupting compounds from wastewater by photocatalysis

Combined use of photocatalyst and adsorbent for the removal of inorganic arsenic(III) and organoarsenic compounds from aqueous media.

The degradation of organoarsenic compounds by a hydrothermal process and by photo-oxidation was studied. When 4-aminophenylarsonic acid (4-APA) was treated hydrothermally, almost complete degradation into an inorganic arsenic compound (arsenate, IA) was attained by use of 1.0-3.0 M NaOH solution at 200°C. Phenylarsonic acid derivatives which had nitro or hydroxy substituents on the phenyl ring were rather more efficiently degraded than those with amino-substituents. Compared with phenylarsonic acid derivatives with those functional groups, phenylarsonic acid (PA) and dimethylarsinic acid (DMA) were hard to degrade. On the other hand, DMA was effectively degraded into IA by TiO 2 -catalyzed photo-oxidation, whereas for PA and 4-APA the photo-oxidation treatment was not efficient.

Mayumi Kishita

Papers

Combined use of photocatalyst and adsorbent for the removal of inorganic arsenic(III) and organoarsenic compounds from aqueous media.

Degradation of organoarsenic compounds by a hydrothermal or photo‐oxidation process