Khả năng xử lý chì trong dung dịch bằng hỗn hợp dịch chiết từ lá sả (Cymbopogon citratus) và lá diệp hạ châu (Phyllanthus urinaria) kết hợp với TIO2
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Abstract
This study investigates the adsorption capacity of lead ions (Pb) on two types of TiO2 nanomaterials, synthesized from the extracts of Phyllanthus urinaria (Phyllanthus urinaria) and lemongrass (Cymbopogon citratus) with Titanium isopropoxide using the sol-gel method. The experimental results show that TiO2@Cymbopogon citratus has better adsorption performance at pH 6, with an adsorption time of 120 minutes, a dosage of 0.01 g, and a Pb concentration of 50 mg/L. The adsorption kinetics follow the second-order and Elovich models. Adsorption process of TiO2@Cymbopogon citratus follows the Langmuir isotherm model (single-layer adsorption), while TiO2@Phyllanthus urinaria follows the Freundlich isotherm model (multi-layer adsorption). Moreover, the maximum adsorption capacity (qmax) of TiO2@Cymbopogon citratus (qmax = 467 mg/g) is higher than that of TiO2@Phyllanthus urinaria (qmax = 362.7 mg/g). The study concludes that plant-extracted combined with TiO2 are effective adsorbents for removing Pb in aqueous solution.
Tóm tắt
Nghiên cứu được thực hiện nhằm đánh giá khả năng hấp phụ ion chì (Pb) của hai loại vật liệu nano TiO2, được tổng hợp từ dịch chiết của lá diệp hạ châu (Phyllanthus urinaria) và lá sả (Cymbopogon citratus) với Titanium isopropoxide bằng phương pháp sol-gel. Kết quả thí nghiệm cho thấy TiO2@Cymbopogon citratus hấp phụ tốt hơn ở pH 6, với thời gian hấp phụ 120 phút, liều lượng 0,01 g và nồng độ Pb 50 mg/L. Động học hấp phụ phù hợp với mô hình bậc hai và Elovich. Quá trình hấp phụ của TiO2@Cymbopogon citratus tuân theo mô hình đẳng nhiệt Langmuir (hấp phụ đơn lớp), trong khi TiO2@Phyllanthus urinaria theo mô hình Freundlich (hấp phụ đa lớp). Bên cạnh đó, khả năng hấp phụ tối đa (qmax) của TiO2@Cymbopogon citratus (qmax = 467 mg/g) cao hơn so với TiO2@Phyllanthus urinaria (qmax = 362,7 mg/g). Kết quả nghiên cứu cho thấy dịch chiết từ thực vật kết hợp với TiO2 là chất hấp phụ hiệu quả trong việc loại bỏ Pb trong môi trường nước.
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