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Industrial development in various fields and limited of natural dyes have led to an increase in the use of synthetic dyes which have the potential to produce hazardous wastes if not managed properly. Efforts to process the liquid waste, especially synthetic dye waste can be done in many ways. A simple but supposedly effective way is to utilize magnetic nanoscale adsorbent material as a waste processing agent. The purpose of this study was to synthesize salicylic acid-modified magnetite nanoparticles and apply them as a liquid waste processor, especially green malachite waste. Green malachite is a dye that is often used in industry. The magnetic properties possessed by magnetite material are beneficial in material recovery. The main stages of the study include: the synthesis of magnetite nanoparticles by electro-oxidation of iron in water; modification of material with salicylic acid; characterization of synthesized materials with XRD, FTIR, SEM, and BET; and waste water treatment of green malachite process by salicylic acid-modified magnetite as adsorbent. The results of XRD, FTIR, and SEM characterization showed that the salicylic acid modified magnetite nanoparticles were successfully synthesized. The results of BET characterization provide the specific surface area of particle of 88 m2/g which shows the potential of the material as an adsorbent. The application of material as an adsorbent successfully absorbed 88% green malachite with an adsorption capacity of 15.5 mg/g.