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Rice Husk Silica Adsorbent for Removal of Hexavalent Chromium . But rice husk silica was prepared by burning of clean rice husk inside a muffle furnace at a temperature of 800 C for 4 hours after acid leaching. The effects of four parameters: contact time (30 to 90 min), pH values (2 to 9), adsorbents dosages (0.5 to 1.5 g/L
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