Lubricant oil is commonly used to reduce friction and prevent corrosion. It also protects the metallic components of the machine from wear and tear due to continuous operation. Prolonged use of lubricating oil causes oil contamination due to the presence of polyaromatic hydrocarbons, polychlorinated biphenyls, and toxic heavy metals. The presence of hazardous and toxic contaminants in the used oil, also known as black oil, poses threat to the environment and has detrimental impacts. The present study focuses on refining black oil using different adsorbents like activated clay, silica, and conducting polymers (polyaniline) owing to their excellent adsorption property. The adsorbents in the present study have been characterized using X-ray diffraction, Fourier transforms infrared spectroscopy, FE-SEM analysis, and various other techniques. Specific gravity, viscosity, total acid number, pour point, and aniline point techniques were used to determine the quality of recycled oil. The analysis indicated that the specific gravity of the used oil sample was 0.878 gm/cm³, and the virgin oil sample's specific gravity was 0.863 gm/cm³. The resemblance of the pour point of treated oil to that of virgin lubricant oil indicates the effective recovery of base oil. The aniline point analysis confirmed the presence of some aromatics in the lubricating oil.

润滑油通常用于减少摩擦和防止腐蚀。它还可以保护机器的金属部件免受连续运行造成的磨损。由于存在多环芳烃、多氯联苯和有毒重金属，长期使用润滑油会导致油污染。用过的油（也称为黑油）中存在有害和有毒污染物，会对环境构成威胁并产生不利影响。本研究的重点是使用不同的吸附剂（如活性粘土、二氧化硅和导电聚合物（聚苯胺））精炼黑油，因为它们具有出色的吸附性能。本研究中的吸附剂已使用 X 射线衍射、傅里叶变换红外光谱、FE-SEM 分析和各种其他技术进行了表征。比重、粘度、总酸值、倾点和苯胺点技术用于确定再生油的质量。分析表明，所用油样的比重为0.878 gm/cm³，初榨油样的比重为0.863 gm/cm ³。处理过的油的倾点与原始润滑油的倾点相似表明基础油的有效回收。苯胺点分析证实润滑油中存在一些芳烃。