Dr. Tran Nguyen Hai (Hai Tran), Research lecturer of Faculty of Environment and Labour Safety of Ton Duc Thang University, was awarded "Outstanding Reviewers" certificate of the journals of Elsevier, including Applied Clay Science; Journal of Environmental Chemical Engineering; Journal of Cleaner Production and Journal of Environmental Management. Elsevier is a prestigious publisher of the Netherlands, and Elsevier is awarded to reviewers within the top 10th percentile of reviewers for the journal.