Investigation and optimization the study of Hexavalent Chromium elimination efficiency by activated carbon prepared from modified rice husk with sorbic acidTa Thi Huong, Tran Y. Doan Trang and Pham Huong QuynhE3S Web Conf., 486 (2024) 01030DOI: https://doi.org/10.1051/e3sconf/202448601030