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To explore the adsorption characteristics of arsenic (III) by Penicillium chrysogenum, the effects of initial pH value, adsorption time, and fungus cell dosage on the adsorption of As 3+ by Penicillium chrysogenum were studied, and the kinetic models were used to explore the mechanism of the adsorption of arsenic(III) by Penicillium chrysogenum. The results showed that the adsorption rate reached the maximum when the pH value was 6. The time for adsorption reached equilibrium was 90 min, and the most suitable amount of fungus was 2g/L. The kinetic experimental data is in good agreement with the pseudo-second-order kinetics model. The adsorption of arsenic by Penicillium chrysogenum includes chemical adsorption. Introduction Arsenic is widely found in nature and is a trace element contained in almost all geological bodies. Natural activities such as volcanic eruptions and mineral weathering and human activities such as mineral development, smelting, use of arsenic-containing pesticides, and glass manufacturing are important sources of arsenic contamination [1] . Arsenic is the earliest recognized carcinogen in the world. The accumulation of arsenic in crops and arsenic contamination in water are the main causes of arsenic poisoning and carcinogenesis [2,3] . According to the survey, the arsenic concentration in drinking water is positively correlated with the incidence of lung cancer and bladder cancer [4,5] . Microbioremediation technology has the advantages of low cost, high efficiency, no secondary pollution, and has great potential in the restoration of natural water bodies. A large number of scholars have studied the use of microorganisms to repair Cr, Cu, Zn, Pb and other heavy metal pollution, and also found many microorganisms that are highly resistant to heavy metals and removal capacity [6,7] . The arsenic concentration, in Datun Lake, Yunnan province of China, is 0.96 mg/L [8] . In the previous experiments, we screened Penicillium chrysogenum from the sediment in Datun Lake and found that it has ability to remove arsenic. The influencing factors and adsorption mechanism of the adsorption of arsenic (III) by this strain were investigated. Materials and Methods The adsorption experiments were carried out in a thermostatic shaker at 30°C and 180r/min. The initial concentration of arsenic (III) was 1 mg/L; parallel and contrast were set for each experiment. After the adsorption was completed, the arsenic concentration of the solution was measured with an atomic fluorescence spectrophotometer after 3 times filtration. The removal ratio of As 3+ is calculated using the equation: P=(C0-C)/C0 ×100% (1) C0 indicates the arsenic concentration in the blank comparison, and C indicates the arsenic concentration after the adsorption.

Study on the Biosorption Performance of Penicillium chrysogenum for the Removal of Arsenic (III)