Tổng hợp than sinh học từ phế phẩm vỏ cà phê ứng dụng làm chất cải tạo đất nông nghiệp ở Việt Nam=Biochar synthesis from waste coffee peel for applications as a soil improver in viet nam

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Tác giả: Quý Diễm Đỗ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ (ĐH Công nghiệp TP. HCM), 2024

Mô tả vật lý: tr.88-96

Bộ sưu tập: Metadata

ID: 244882

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In this work, the waste coffee peel was calcined at 4500C, 40 minutes to synthesize biochar, denoted as BCC. The BCC sample was then analyzed to evaluate the morphological and surface structural properties such as Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET). The resulted measurement of properties shown that the geometrical structure on the BCC was flat particles stacked on top of each other, containing many cavities, with an average particle size was 10 μm analyzed by SEM. The specific surface area of BCC was 2.77 m2/g as measured by BET analysis. The structure on BCC with bonds of vibration groups such as O-H, C=C, C-O, and carbon graphite crystals was analyzed by FTIR and XRD methods, respectively. In the applied research as a soil improver, the BCC sample was impregnated with organic nutrients to make organic fertilizer and tested directly on broccoli and then showed that BCC-fertilized broccoli grew better than the unfertilized sample. In addition, BCC applied as lead ion adsorbent (Pb2+) in soil which it given the optimal adsorption capacity of 23.86 mg Pb2+/g BCC. Based on these results indicated that biochar synthesized from waste coffee peel was enough the standards as a soil improver in Viet Nam.Trong nghiên cứu, phế phẩm vỏ cà phê được nhiệt hóa yếm khí tại nhiệt độ 450oC, thời gian 40 phút để tổng hợp than sinh học, ký hiệu là BCC. Mẫu BCC sau đó được định tính hình thái và cấu trúc bề mặt bằng các phương pháp phân tích như là kính hiển vi điện tử quét (SEM), nhiễu xạ tia X (XRD), quang phổ hồng ngoại biến đổi Fourier (FTIR), Brunauer-Emmett-Teller (BET). Kết quả định tính cho thấy cấu trúc bề mặt của BCC ở dạng phẳng xếp chồng lên nhau, chứa nhiều hổng hốc, kích thước hạt phẳng là 10μm được đo đạc bởi SEM. Diện tích bề mặt riêng của BCC được tính toán là 2.77 m2/g đo bởi phân tích BET. Cấu trúc trên BCC tồn tại các liên kết của nhóm dao động như là O-H, C=C, C-O, và carbon graphite tinh thể được phân tích bằng phương pháp lần lượt FTIR và XRD. Trong ứng dụng làm chất cải tạo đất, BCC được sử dụng là chất nền để hấp phụ dinh dưỡng hữu cơ sử dụng làm phân bón và khảo nghiệm trực tiếp trên cây cải xanh. Kết quả khảo nghiệm cho thấy, cải xanh được bón phân hữu cơ phát triển tốt hơn so với mẫu không bón. Ngoài ra, BCC cũng được ứng dụng làm chất hấp phụ ion chì (Pb2+) trong đất, cho kết quả khả năng hấp phụ tối ưu là 23.86 mg Pb2+/gBCC. Dựa trên những kết quả ứng dụng, than sinh học được tổng hợp từ vỏ cà phê đáp ứng tiêu chuẩn làm chất cải tạo đất nông nghiệp ở Việt Nam.

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