HẤP PHỤ KHÍ CO2 TỪ THAN SINH HỌC VỎ HẠT MẮC-CA

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Tác giả: Hồng Nam Nguyễn, Văn Đông Nguyễn, Văn Bẩy Trần, Ngọc Linh Vũ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Trường Đại học Công nghiệp Hà Nội, 2022

Mô tả vật lý: tr.126

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Sản lượng và diện tích trồng cây mắc-ca ngày càng tăng nhanh kéo theo lượng phụphẩm nông nghiệp vỏ hạt mắc-ca tăng theo, gây nên những lo ngại về môi trường. Mộttrong những phương pháp để giảm thiểu những tác động xấu đến môi trường là chuyển đổithành than sinh học bằng phương pháp nhiệt phân nhằm hấp phụ khí CO2. Giải pháp nàyvừa giúp giảm thiểu lượng phụ phẩm nông nghiệp thừa vừa giúp giảm ô nhiễm môi trườngkhông khí. Nhiệt phân vỏ hạt mắc-ca được thực hiện trong lò nung Nabartherm ở điều kiện600oC trong môi trường khí N2. Kết quả phân tích SEM-EDS và hấp nhả N2 cho thấy hình tháihọc bề mặt than sinh học có độ gồ ghề không đồng nhất, diện tích bề mặt của than sinh họclà 127,44m2/g. Kết quả phân tích FTIR cho thấy có rất ít nhóm chức xuất hiện trên bề mặtthan, chứng tỏ sự hấp phụ khí CO2 chủ yếu là hấp phụ bằng cơ chế thu giữ vật lý. Ứng dụngcủa than sinh học trong hấp phụ khí CO2 được thực hiện ở quy mô phòng thí nghiệm điềukiện nhiệt độ phòng và áp suất khí quyển, tốc độ dòng CO2 5 lít/phút, đạt giá trị cao nhất vàổn định 1,1mmol/g. Kết quả này chứng minh than vỏ hạt mắc-ca có thể được sử dụng làmchất hấp phụ khí CO2 rẻ và thân thiện với môi trường.The rapid development in the plantation area of macadamia trees has led to anincrease in the number of agricultural by-products, most importantly macadamia nutshells, and may cause environmental concerns if not treated properly. One of themethods to reduce the negative impact on the environment is to convert it into biocharby pyrolysis for CO2 adsorption. Pyrolysis of macadamia nut shells was carried out byNabertherm at 600oC in an atmosphere containing pure N2. The results of SEM-EDSanalysis and N2 adsorption/desorption isotherms showed that the biochar structure washighly porous, and the surface area of biochar was 127.44m2/g. The FTIR analysis resultsshowed that very few functional groups existed on the surface, suggesting that the CO2adsorption onto this biochar would rather follow a physical capturing mechanism. Theapplication of biochar for CO2 adsorption was carried out in laboratory conditions of roomtemperature and atmospheric pressure, CO2 flow rate of 5 liters /min, and achieved ahigh and stable CO2 adsorption value at 1.1mmol/g. This result showed that macadamianut shells could be used for the production of cheap and environmentally friendlyabsorbent.

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