Abstract
Arsenic is a kind of protoplasmic poison, which exists widely in the natural environment. Consuming too much arsenic can cause a number of health problems. Manganese oxide plays an important role in arsenic pollution removal technology. In this paper, arsenic hazard and its treatment methods and the application of manganese oxides in arsenic pollution treatment are summarized, and the prospect of research on arsenic pollution treatment by manganese oxides is put forward.
Highlights
Arsenic is widely found in the natural environment, mainly in the form of arsenite (As(III)) and arsenate (As(V))[1,2,3]
Arsenic compounds are protoplasmic poisons with metal-like properties that have a wide range of biological effects and are defined as class I carcinogens by the International Agency for Research on Cancer (IARC)
Excessive intake of arsenic will cause a series of health problems such as nervous disorders, deformities, melanosis, keratosis and cancer[4]
Summary
Arsenic is widely found in the natural environment, mainly in the form of arsenite (As(III)) and arsenate (As(V))[1,2,3]. Due to its high toxicity, the concentration of arsenic in drinking water should not exceed 10 μg/L according to China's sanitary standards and the World Health Organization. Arsenic pollution is the world's second largest water health hazard after pathogenic microorganisms [5]. The total area of groundwater arsenic content above 10 μg/L is 5.8×105 km, and the average arsenic content in soil is 11.2 mg/kg, about 1.5 times of the world average (7.2 mg/kg) [6]. According to the 2014 National Soil Pollution Survey Bulletin, the total soil exceeding standard rate in China is 16.1%, and the point exceeding rates of Cd, Hg, Arsenic, Copper and Lead are 7.0%, 1.6%, 2.7%, 2.1% and 1.5% respectively. Arsenic is the primary contaminant among the heavy metal pollutants in soil in China [6]. Arsenic hazard and its treatment methods and the application of manganese oxides in arsenic pollution treatment are summarized, and the prospect of research on arsenic pollution treatment by manganese oxides is put forward
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