Tổng hợp hydrogel sinh khối dựa trên lignin chức năng với khả năng trương nở và hấp thụ cao đối với Acid Red 73

Springer Science and Business Media LLC - Tập 28 - Trang 51306-51320 - 2021
Shuxia Wei1, Wu Chen1, Zhiming Tong1, Nan Jiang1, Mijia Zhu1
1School of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, China

Tóm tắt

Trong nghiên cứu này, lignosulfonat natri (LS) được sử dụng làm nguyên liệu thô. Acrylamid (AM) và acryloxyethyltrimethylammonium chloride (DAC) được graft lên LS thông qua phản ứng đồng polymer hóa gốc tự do để tổng hợp một hydrogel hấp phụ terpolymer sinh khối dựa trên lignin (LAD) chức năng. Các yếu tố khác nhau ảnh hưởng đến sự hấp phụ của LAD với Acid Red (AR 73) đã được điều tra thông qua phương pháp hấp phụ tĩnh. LAD đã hấp phụ AR 73 (C0=100mg·L−1) trong 2 giờ để đạt trạng thái cân bằng, và dung lượng hấp phụ đạt được và tỷ lệ loại bỏ lần lượt là 47,59 mg·g−1 và 95,18%. Tỷ lệ trương nở của hydrogel LAD trong 2 giờ là 25 g·g−1, và tỷ lệ mất nước trong dung môi ethanol trong 120 phút là 93,51%. Sự hấp phụ AR 73 của LAD phù hợp với mô hình hấp phụ isotherm Langmuir. Quá trình hấp phụ này là hấp phụ một phân tử với dung lượng hấp phụ tối đa là 409,84 mg·g−1. Quá trình hấp phụ là một quá trình giải phóng nhiệt tự phát và giảm entropy. Kinetics hấp phụ tuân theo mô hình giả bậc hai, với năng lượng kích hoạt hấp phụ là 2,501 kJ·moL−1. Hơn nữa, cơ chế hấp phụ là lực hấp dẫn tĩnh điện, cùng với những ảnh hưởng tổng hợp của hấp phụ vật lý và hóa học cùng với liên kết hydro. Chất hấp phụ hydrogel LAD có hiệu quả hấp phụ đáng kể đối với AR 73, và có thể được sử dụng như một chất hấp phụ sinh khối hiệu quả và tái chế cho việc xử lý nước thải nhuộm anion.

Từ khóa

#lignosulfonat natri #hydrogel #hấp phụ #Acid Red 73 #polymer hóa gốc tự do #terpolymer sinh khối

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