Study on the modification of Phu Yen diatomite by mixed Fe-Mn oxide and the use of the modified material as an arsenic removal adsorbent in water environment. Vietnam j. catal. adsorp. [Internet]. 2021 Apr. 30 [cited 2026 Jul. 28];10(1):13-20. Available from: https://jca.edu.vn/index.php/jca/article/view/2021.003