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Removal of metal ions such as chromium, iron and nickel from synthetic wastewater studied using tree leaves and activated carbon of tree leaves as adsorbent at ambeint temperature. Five different kinds of tree leave species and its activated carbons tested at the room temperature. The experiments were carreid out with 2gm of 0.60 mn to 1.60 mn leaf size in 200ml synthetic wastewaer containing 20-ppm metal ions. The initial pH of the synthetic wastewater was about 6. The experimental resuls indicate that highest removal rates were in activated carbon tree leave species that tree leaves. It was 85% chromium (Cr⁺⁶) by activated Neem, 76% iron (Fe⁺²) by activated Neem and Ber and 72% nickel (Ni⁺²茶叶废料)激活。