1. 1. Ambika PPS. Natural Polymer-Based Hydrogels for Adsorption Applications. Available from: https://books.google.com.sg/books?hl=zh-CN&lr=&id=16Dg
2. DwAAQBAJ&oi=fnd&pg=PA267&ots=C86-q47tG7&sig=TkNjjkx__NqZbSWTgG
3. kjnHDJ7uA#v=onepage&q&f=false. Accessed 2023 Aug 25.
4. 2. Gopakumar DA, Arumughan V, Pasquini D, Leu SY, Abdul Khalil HPS, Thomas S. Nanocellulose-Based Membranes for Water Purification. Available from: https://www.sciencedirect.com/science/article/abs/pii/B9780128139264000045. Accessed 2023 Aug 25.
5. Environmental and Health Impacts of Air Pollution: A Review;Manisalidis;Front Public Health,2020