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Natural silk is a very expensive material for the textile industry. Silk mills produce large amounts of fibrous waste from natural silk. It is very important to prepare the necessary materials for industry from the fibrous waste of silk. We obtained a multifunctional sorbent from silk fiber waste by various methods to purify vegetable oils. The resulting sorbent was used to purify cottonseed oil instead of bentonite-based sorbents. As a result of the purification of cottonseed oil using sorbent samples from silk fiber waste, we were able to reduce the oil peroxide value from 11 mmol/L to 3,9 mmol/L. Reducing the peroxide value of vegetable oils increases the shelf life of vegetable oils. It is possible to reuse 2-3 times in the purification of vegetable oils by reactivating the sorbent obtained from the fibrous waste of silk, and the sorbent does not affect the composition of the oil, even if it is in the oil environment for a long time. A sorbent derived from the fibrous waste of silk we recommend is used to reduce the waste of silk mills and oil mills.