Khảo sát quá trình Fenton dị thể sử dụng hạt nano sắt hóa trị 0 trên nền Graphene oxide dạng khử (rGO/nZVI) để xử lý độ màu trong nước thải dệt nhuộm
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Abstract
This study employed the Taguchi method to determine the influence of various factors on the color removal efficiency of textile wastewater. Zero-valent iron nanoparticles (nZVI) and a composite of nZVI on reduced graphene oxide (rGO/nZVI) were used as catalysts in the heterogeneous Fenton reaction. ANOVA analysis revealed that pH was the most significant factor, contributing 55,9% for nZVI and 92,4% for rGO/nZVI. Other factors, such as catalyst dosage and H₂O₂ concentration, also had an impact but to a lesser extent. Using a catalyst dosage of 1000 mg/L, H₂O₂ concentration of 1000 mg/L, pH 3, and a reaction time of 90 minutes, nZVI achieved a color removal efficiency of 84,2% in the first cycle, which dropped to 56,4% after six reuse cycles. Meanwhile, rGO/nZVI achieved an initial efficiency of 96,2% but declined to only 42,1% after six reuse cycles. The results demonstrate that the rGO/nZVI composite enhances color removal efficiency compared to standalone nZVI, although the reusability of the composite material still requires improvement.
Tóm tắt
Nghiên cứu được thực hiện bằng cách sử dụng phương pháp Taguchi để xác định mức độ ảnh hưởng của các yếu tố đến hiệu suất xử lý độ màu của nước thải dệt nhuộm. Vật liệu nano sắt hóa trị 0 (nZVI) và tổ hợp nZVI trên graphene oxide dạng khử (rGO/nZVI) được sử dụng làm xúc tác cho phản ứng Fenton dị thể. Việc phân tích ANOVA cho thấy pH là yếu tố quan trọng nhất, đóng góp 55,9% đối với nZVI và 92,4% đối với rGO/nZVI. Các yếu tố khác như liều lượng vật liệu và H₂O₂ cũng có ảnh hưởng nhưng ít hơn.Với liều lượng vật liệu 1000 mg/L, H₂O₂ 1000 mg/L, pH 3 và thời gian phản ứng 90 phút, khi sử dụng nZVI thu được hiệu quả loại bỏ độ màu 84,2% trong lần đầu tiên và giảm còn 56,4% sau sáu chu kỳ tái sử dụng. Với rGO/nZVI, hiệu suất đạt đến 96,2% trong lần đầu, nhưng giảm chỉ còn 42,1% sau sáu lần tái sử dụng. Kết quả cho thấy tổ hợp rGO/nZVI cải thiện hiệu suất xử lý độ màu so với nZVI đơn lẻ, mặc dù khả năng tái sử dụng của vật liệu tổ hợp vẫn cần cải thiện.
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