Lemna minor (LM), apricot kernel shell (AKS), monterey pinecone (MP) and almond shell (AS) wastes were directly used by carbonizing together to reduce costs and increase carbon yields. They were carbonized alone/together at 800°C and 90 min, and their carbonization yields, adsorption capacities, physical and chemical properties were investigated. In EDX analysis, LM, AKS, AS and MP biomasses contain many inorganic substances. According to XRD analysis, the structure of LM is semi-crystalline and the others are amorphous. According to UV, XRD and SEM analysis, the co-carbonization process promoted both crystallinity and formation of mesopore/micropore structures. It also increased the carbonization yields. The highest carbonization yield and the highest crystal violet (CV) removal were in the co-carbonization of LM and AS with 38% and 94%, respectively. They can be used as an alternative to existing commercial products due to their cost-effective and high adsorption capacity.