Application of green-synthesized ZnO from papaya and aloe vera leaves for COD treatment in sugarcane wastewater
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Abstract
This study evaluated the efficiency of chemical oxygen demand (COD) removal from synthetic wastewater simulating sugarcane processing effluent using a photocatalytic method with ZnO materials synthesized from papaya (Carica papaya) leaf extract (ZnO-DD) and aloe vera (Aloe vera) leaf extract (ZnO-LH). The materials were prepared via a green synthesis approach and investigated under various operating conditions, including pH, catalyst dosage, reaction time, UV lamp power, and reusability. The results showed that ZnO-DD exhibited higher COD removal efficiency than ZnO-LH under all investigated conditions. Under optimal conditions (pH 8, catalyst dosage of 0.5 g, reaction time of 60 min, and UV lamp power of 20 W), the COD removal efficiencies reached 62.22% for ZnO-DD and 53.33% for ZnO-LH. In addition, ZnO-DD demonstrated better reusability, with COD removal efficiencies of 58.10%, 46.67%, and 35.24% after three consecutive cycles, which were higher than those obtained for ZnO-LH. These findings indicate that biologically synthesized ZnO materials, particularly ZnO-DD, have considerable potential for the treatment of organic wastewater containing refractory compounds, contributing to the development of environmentally friendly and cost-effective wastewater treatment technologies.
Tóm tắt
Trong nghiên cứu này, phương pháp quang xúc tác sử dụng vật liệu ZnO tổng hợp từ chiết xuất lá đu đủ (Papaya) (ZnO-ĐĐ) và lá lô hội (Aloe vera) (ZnO-LH) được áp dụng để xử lý COD trong nước thải nhà máy mía đường. Vật liệu được chế tạo theo phương pháp tổng hợp xanh (green synthesis) và được khảo sát trong các điều kiện khác nhau: pH, khối lượng vật liệu, thời gian phản ứng, công suất đèn UV và khả năng tái sử dụng của vật liệu. Kết quả cho thấy, ZnO-ĐĐ có hiệu suất xử lý COD cao hơn so với ZnO-LH trong tất cả các điều kiện nghiên cứu. Tại điều kiện thí nghiệm thích hợp (pH 8, 0,5 g vật liệu, thời gian phản ứng 60 phút, công suất đèn UV 20 W), hiệu suất xử lý COD đạt 62,22% đối với ZnO-ĐĐ và 53,33% đối với ZnO-LH. Vật liệu ZnO-ĐĐ cho thấy khả năng tái sử dụng vượt trội, khi hiệu suất xử lý COD sau ba chu kỳ vẫn đạt lần lượt 58,10%, 46,67% và 35,24%, cao hơn đáng kể so với vật liệu ZnO-LH. Kết quả nghiên cứu cho thấy vật liệu ZnO sinh học, đặc biệt là ZnO-ĐĐ, có tiềm năng ứng dụng trong xử lý nước thải hữu cơ chứa các hợp chất khó phân hủy, góp phần định hướng phát triển các công nghệ xử lý nước thải thân thiện với môi trường và chi phí thấp.
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