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Cảm biến quang điện hóa học của hydrogen peroxide tại thế hoạt động bằng không sử dụng điện cực thích hợp với BiVO4 microrods pha tạp fluorine
Tóm tắt
Các tác giả mô tả một phương pháp quang điện hóa học (PEC) hiệu quả cao để xác định hydrogen peroxide (H2O2). Microrods BiVO4 được tổng hợp bằng phương pháp thủy nhiệt và được lắng đọng trên kính oxit thiếc pha tạp fluorine (FTO) mà hoạt động như một điện cực làm việc. Kính hiển vi điện tử quét, nhiễu xạ rơ đồ bột X-ray và phổ Raman đã được sử dụng để đặc trưng hóa các microrods. Khi chiếu sáng bằng ánh sáng nhìn thấy, các lỗ điện tử được tạo ra trong các microrods đang thu hút electron từ H2O2 để sản xuất một photocurrent tại thế hoạt động 0 V so với Ag/AgCl. Dưới điều kiện tối ưu, photocurrent tăng theo nồng độ H2O2 trong khoảng từ 50 μmol·L−1 đến 1.5 mmol·L−1, và giới hạn phát hiện là 8.5 μmol·L−1 (tại 3σ). Sự lặp lại và độ chính xác trung gian ≤6.6% đã được thực hiện ở các mức H2O2 là 0.1, 0.5 và 1.0 mmol·L−1. Phương pháp đã được áp dụng để xác định H2O2 trong các mẫu sữa tiệt trùng và cho kết quả thỏa mãn. Khi phương pháp làm việc ở thế bằng không, photocurrent có thể được đo bằng các thiết bị đơn giản như ampe kế số, và điều này sẽ cho phép các trạm làm việc điện hóa đắt tiền được thay thế trong tương lai.
Từ khóa
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