Abstract: This paper studied the adsorption equilibrium between Cu²⁺ and δ-MnO² in solution in the presence of bovine serum albumin (BSA) to be beneficial to understand the environmental chemical behavior of Cu²⁺. The results showed that in the presence of BSA, the change pattern of Cu²⁺ adsorption onto δ-MnO₂ with pH was a typical Sshape curve. BSA made the adsorption leap of Cu²⁺ moved to high pH range, and the degree was related to the adding order of BSA, i.e., Ⅳ (BSA added first)> Ⅲ (Cu²⁺ and BSA added simultaneously)≈Ⅱ (Cu²⁺ added first). The Cu²⁺ adsorption in the presence of BSA was fitted Langmuir adsorption isotherm, and the saturated Cu²⁺ adsorption quantity decreased with increasing BSA concentration and changed with the adding order of BSA, i.e., I (without BSA)>Ⅱ≈Ⅲ>Ⅳ. In addition, the maximum capacity of Cu²⁺ onto δ-MnO₂ increased with increasing temperature. The adsorption of Cu²⁺ onto δ-MnO₂ was reversible at pH 3.0 but irreversible at pH 5.0. BSA had no influence on the reversibility of Cu²⁺ adsorption onto δ-MnO₂.

Key words: Bradysia odoriphaga, Taeniothrips alliorum, Pest control, Phoxin, Methyl parathion, Bio-degradation, Pesticide-degrading bacterium