Oil pollution has become a water pollution problem in the world. An eco-friendly adsorbent need to be produced to resolve this problem. This study focuses on removing oil waste using Chempedak Stone (CS) powder as a natural adsorbent. The purpose of the study is to observe the effects of adsorbent dosage and the effects of several type of water sources on adsorbing different types of oils (vegetable oil, lubricant oil and diesel oil). Different adsorbent dosage (treated and untreated) of 0.2g, 0.4g, 0.6g, 0.8g and 1.0g was examined in different types of water which are tap water, sea water and lake water. The treated adsorbent was introduced to 0.5M NaOH and 0.5M nitric acid (HNO3). The CS was collected from a local market and went through several processes to become a powder such as rinsing, drying, crushing and sieving. The results show that the increasing adsorbent dosage decreased the percentage of oil removal. It was proven that the effectiveness of treated and untreated adsorbent depended on the type of oil and the type of water. The highest percentage of oil removal was found using untreated CS powder on vegetable while treated CS powder was effective for adsorbing lubricant oil at the dosage of 0.2g. The results thus showed that untreated CS powder has the most effective adsorbent to adsorb various types of oils on various types of water compared to treated CS powder.
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