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Các khoa học môi trường

Trần Nguyễn Phương Lan(1), Lương Huỳnh Vũ Thanh, Huỳnh Quốc Khanh, Nguyễn Thị Anh Thư, Trần Nguyễn Phương Dung, Thi Trần Anh Tuấn, Ngô Trương Bảo Trang, Phạm Quốc Phú, Lý Kim Phụng, Trần Thanh Trúc, Le Phan Hung, Lương Huỳnh Vủ Thanh(2)

Tổng hợp zeolite NaA/NaX từ tro trấu không nung bằng phương pháp thủy nhiệt

Synthesis of zeolite NaA/NaX from rice husk ash without calcination by using hydrothermal method

Khoa học (ĐH Cần Thơ)

2020

6A

22-32

1859-2333

Phương pháp thủy nhiệt trực tiếp, Thu hồi SiO2, Tỉ lệ SiO2:Al2O3, Tro trấu không nung, Zeolite NaA/NaX

In-situ hydrothermal method, Ratio of SiO2, Al2O3, Recovery of SiO2, Rice husk ash without calcination, Zeolite NaA/NaX

Khoa học kỹ thuật phát triển và bùng nổ dân số dẫn đến môi trường sống bị ô nhiễm nghiêm trọng, nhất là ô nhiễm kim loại nặng. Tổng hợp zeolite và ứng dụng làm chất hấp phụ, xúc tác rắn và trao đổi ion đã được quan tâm. Trong nghiên cứu này, zeolite được tổng hợp từ tiền chất sodium silicate có nguồn gốc từ tro trấu không nung. Phần trăm thu hồi silica từ tro trấu không nung là 90% ở tỉ lệ tro trấuNaOH = 110 (g/mL), nồng độ NaOH 5 M, thời gian phản ứng 3 h, tốc độ khuấy 300 rpm ở 90oC. Các yếu tố ảnh hưởng đến quá trình tổng hợp zeolite NaA/NaX như tỉ lệ SiO2Al2O3, nhiệt độ phản ứng T1 (oC), thời gian phản ứng t1 (h) và thời gian già hóa t2 (h) được khảo sát. Kết quả cho thấy phần trăm zeolite NaA/NaX kết tinh là 52,7% ở 100oC, 4 h, thời gian già hóa 12 h, tỉ lệ SiO2Al2O3 = 12,5 và tỉ lệ AlNaOH = 12. Mặc dù phần trăm kết tinh của zeolite NaA/NaX không cao so với những nghiên cứu đã công bố nhưng nghiên cứu này đã sử dụng trực tiếp tro trấu mà không cần trải qua quá trình nung để thu hồi silica. Do đó, quy trình tổng hợp thân thiện với môi trường, giúp tiết kiệm thời gian và năng lượng của quá trình.

The development of technology and science as well as the growth of population cause the seriously polluted environment, especially the pollution of heavy metals. Synthesis of zeolites and their applications in adsorption, solid catalysts and ion exchange have been concerned. In this study, zeolite was synthesized from the precursor of sodium silicate originated from rice husk ash (RHA) without calcination by using hydrothermal method. The percentage of silica recovery from RHA without calcination was reached at about 90% when the optimal reaction conditions were at the ratio of RHA to NaOH = 110 (g/mL), the concentration of NaOH of 5 M, the reaction time of 3 h, the stirring speed of 300 rpm and the reaction temperature of 90oC. The parameters affected zeolite NaA/NaX synthesis such as ratio of SiO2 to Al2O3, the reaction temperature T1 (oC), reaction time t1 (h) and aging time t2 (h) were investigated. The results showed that crystal percentage of zeolite NaA/NaX was obtained at 52,7% during 4 h, 100oC, aging time of 12 h, ratio of Al2O3 to SiO2 of 2,5 and the ratio of AlNaOH = 12 Although the crystal percentage of zeolite NaA/NaX in this study was not as high as that of other published researches, the in-situ synthesis used RHA without calcination and recovery of silica during the synthesis of zeolite NaA/NaX. Therefore, the synthesized process is environmental friendly as well as time and energy savings.

TTKHCNQG, CVv 403

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