Nghiên cứu khả năng hấp phụ chất màu methyl da cam trong dung dịch nước sử dụng vật liệu composite ZnO/chitosan kích thước nano=Study on methyl orange adsorption capacity in water-based solutions using nano ZnO/chitosan composite

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Tác giả: Ngọc Thịnh Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học và Công nghệ Việt Nam, 2025

Mô tả vật lý: tr.45976

Bộ sưu tập: Metadata

ID: 478443

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Ngày nay, thuốc nhuộm hữu cơ được sử dụng nhiều trong các ngành công nghiệp như: dệt nhuộm, mỹ phẩm, giấy, cao su... Tuy nhiên, sự phát triển nhanh của các ngành công nghiệp này đã làm tăng đáng kể lượng chất thải chứa thuốc nhuộm hữu cơ thải ra môi trường, do vậy cần có biện pháp xử lý hiệu quả. Trong bài báo này, vật liệu nanocomposite ZnO/chitosan (ZnO/CS) đã được tổng hợp bằng phương pháp đồng kết tủa. Sau khi được tổng hợp thành công, vật liệu nanocomposite ZnO/CS được phân tích đặc trưng bằng các phương pháp phổ nhiễu xạ tia X, kính hiển vi điện tử quét và hiển vi điện tử truyền qua. Kết quả cho thấy, kích thước trung bình của tinh thể nano ZnO khoảng 29,6 nm. Vật liệu nanocomposite ZnO/ CS có dạng hạt hình cầu và hình lục giác có kích thước trong khoảng 20-40 nm. Vật liệu tổng hợp đã được sử dụng để loại bỏ chất màu methyl da cam khỏi dung dịch nước. Kết quả cho thấy, thời gian hấp phụ đạt tới cân bằng sau 20-30 phút, kết quả hấp phụ phù hợp với mô hình đẳng nhiệt Freundlich, chứng tỏ quá trình hấp phụ là đa lớp. Vật liệu được chứng minh có khả năng hấp phụ tốt chất màu methyl da cam với dung lượng hấp phụ cực đại đạt 33,90 mg/g, chứng tỏ vật liệu hoàn toàn có khả năng phát triển thêm để tiến tới ứng dụng làm chất hấp phụ chất màu hữu cơ.Nowadays, organic dyes are widely used in numerous industrial fields such as textile dyeing, cosmetics, paper, rubber, etc. However, the rapid development of these industries has significantly increased the amount of waste containing organic dyes released into the environment, thus, they need to be effectively treated. In this article, ZnO/chitosan nanocomposites (ZnO/CS) were synthesised by the co-precipitation method. After being successfully synthesised, ZnO/CS nanocomposite materials were characterised by X-ray diffraction spectroscopy, scanning electron microscopy and transmission electron microscopy. The results indicate that the average size of ZnO nanocrystals is about 29.6 nm. ZnO/CS nanocomposite materials have spherical and hexagonal particles ranging in size from 20 to 40 nm. The synthesised material was used to remove methyl orange from water-based solutions. The results demonstrate that the equilibrium adsorption time is reached after about 20-30 minutes, the adsorption results are more appropriately described by the Freundlich isotherm model, proving that the adsorption process is multilayer. The material is proven to have a good adsorption capacity of methyl orange with a maximum adsorption capacity of 33.90 mg/g, showing that the material is fully capable of further development to be applied as an adsorbent for organic dyes.

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