Ngô Trương Ngọc Mai * , Lương Huỳnh Vủ Thanh , Đặng Huỳnh Giao Cao Lưu Ngọc Hạnh

* Tác giả liên hệ (ntnmai@ctu.edu.vn)

Abstract

In this study, hot-pressed cantaloupe seed oil at 110°C was decolored by adsorption method using natural adsorbents, such as bentonite clay from Kien Khe–Ha Nam and Truc Thon white clay from Hai Duong. Bentonite clay and white clay were pretreated into four types: bentonite, refined bentonite, white clay and ball milled white clay. The color adsorption capacity of the clay samples was analyzed based on the UV-Vis photoabsorption method, showing that the pigments in cantaloupe seed oil absorbed light in both wavelength ranges of 300-350 and 400-500 nm. The color adsorption capacity of bentonite and refined bentonite is higher compared to that of other clays, resulting in seed oil with a much lighter color after adsorption. The adsorption by bentonite reached an efficiency of 27.75% at 315 nm, 77.21% at 450 nm and refined bentonite reached 17.22% at 315 nm, 92.53% at 450 nm when adsorbed at optimum conditions of adsorption time and adsorbent mass.

Keywords: Bentonite, cantaloupe seed oil, clay, colour adsorption, hot pressing

Tóm tắt

Trong nghiên cứu này, màu dầu hạt dưa lưới ép nóng ở 110°C  được xử lý bằng phương pháp hấp phụ với các vật liệu tự nhiên, như đất sét bentonite từ mỏ đất sét Kiện Khê – Hà Nam và đất sét trắng Trúc Thôn, Hải Dương. Đất sét bentonite và đất sét trắng được xử lý sơ bộ thành bốn loại gồm bentonite, bentonite tinh chế, đất sét trắng và đất sét trắng nghiền bi. Khả năng hấp phụ màu dầu hạt dưa lưới của các mẫu đất sét được phân tích dựa trên phương pháp quang phổ hấp thụ phân tử UV-Vis. Kết quả cho thấy các thành phần gây màu dầu hạt dưa lưới hiện diện trong cả hai vùng bước sóng 300 – 350 nm và 400 – 500 nm. Trong đó, khả năng hấp phụ màu của bentonite và bentonite tinh chế là tốt nhất. Khả năng hấp phụ màu của bentonite đạt hiệu suất 27,75% ở bước sóng 315 nm, 77,21% ở 450 nm còn bentonite tinh chế đạt 17,22% ở 315 nm và 92,53% ở 450 nm ở các điều kiện tối ưu về thời gian hấp phụ và khối lượng vật liệu hấp phụ.

Từ khóa: Bentonite, dầu hạt dưa lưới, đất sét, ép nóng, hấp phụ màu

Article Details

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