AUTHOR=Li Changming , Zhao Shuying , Li Ming , Yao Zhiliang , Li Yang , Zhu Chuanqiang , Xu Si-Min , Li Junjie , Yu Jian TITLE=The effect of the active carbonyl groups and residual acid on the ammonia adsorption over the acid-modified activated carbon JOURNAL=Frontiers in Environmental Science VOLUME=11 YEAR=2023 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2023.976113 DOI=10.3389/fenvs.2023.976113 ISSN=2296-665X