Plant-based calcium silicate from rice husk ash: A green adsorbent for free fatty acid recovery from waste frying oil by Zainor Syahira Zainal, Pengyong Hoo, Abdul Latif Ahmad, Ahmad Zuhairi Abdullah, Qihwa Ng, Siewhoong Shuit, Siti Kartini Enche Ab Rahim, Jeyashelly Andas

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