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Bùi Mạnh Hà(1)

Oxi hóa diazinon bằng quá trình fenton đồng thể.

Oxidation of diazinon by homogeneous fenton process

Tạp chí Khoa học (Trường Đại học Sư phạm TP. Hồ Chí Minh)

2019

3

5-16

1859-3100

Diazinon, Fenton đồng thể, Quá trình oxi hóa

Diazinon, Fenton, Oxidation

Quá trình phân hủy diazinon bằng Fenton đồng thể được khảo sát trong mô hình 1L. Các thông số ảnh hưởng đến hiệu quả loại trừ diazinon như: nồng độ diazinon, pH, nhiệt độ, hàm lượng H2O2, sắt loại xúc tác (Fe2+, Fe3+) đều được nghiên cứu. Kết quả cho thấy phản ứng xảy ra hiệu quả tại pH trong khoảng 3 đến 4 (đạt 90,82% và 90,63%), trong khi hiệu quả lại ít bị ảnh hưởng bởi nhiệt độ hay loại xúc tác. Hiệu suất phản ứng cũng tăng khi tăng nồng độ H2O2 từ 70 mg/l tới 150 mg/L và Fe2+ từ 2 mg/L lên 5 mg/L. Hiệu suất loại trừ diazinon đạt cao nhất là 90,95% tại nồng độ ban đầu diazinon là 10 mg/l, H2O2=150 mg/l and Fe2+ = 5 mg/l. Kết quả trên cho thấy Fenton đồng thể có thể sử dụng như quá trình tiền xử lí trước giai đoạn xử lí sinh học cho nước thải thuốc trừ sâu nhiễm diazinon.

The degradation of aqueous diazinon from an aqueous solution using H2O2/Fe2+process is performedin a 1L batch chemical reactor. The extent of diazinon degradation (20 mg/L) has been investigated from a known initial pH solution, temperature and catalyst type (Fe2+, Fe3+) and for various initial concentrations of diazinon, H2O2and Fe2+. The degradation efficiency was obtained (90.82% and 90.63%) at pH 3 and 4of the initial solutionrespectivelywhilecatalyst type and reaction temperature have a slight impact on the final degradation of diazinon. Efficiency of diazinon removal can be enhanced by increasing initial H2O2concentration in the range of 70 to 150 mg/L and initial Fe2+concentration in the range of 2 to 5 mg/L. The highest degradation efficiency obtained was 90.95% at initialdiazinonconcentration of 10 mg/L, H2O2=150 mg/L and Fe2+= 5 mg/L. This study proved that Fenton process can be used for pretreatment of pesticide wastewater contaminated by diazinon before a biological treatment.

TTKHCNQG, CTv 138

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