The development of manganese (Mn) oxides (MnOx) modified biochar (MnOBC) for the removal of pollutants from water has received significant attention. However, a comprehensive review focusing on the use of MnOBC for the removal of organic and inorganic pollutants from water is missing. Therefore, the preparation and characterization of MnOBC, and its capacity for the removal of inorganic (e.g., toxic elements) and organic (e.g., antibiotics and dyes) from water have been discussed in relation to feedstock properties, pyrolysis temperature, modification ratio, and environmental conditions here. The removal mechanisms of pollutants by MnOBC and the fate of the sorbed pollutants onto MnOBC have been reviewed. The impregnation of biochar with MnOx improved its surface morphology, functional group modification, and elemental composition, and thus increased its sorption capacity. This review establishes a comprehensive understanding of synthesizing and using MnOBC as an effective biosorbent for remediation of contaminated aqueous environments.

Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation Key Laboratory of Plant Soil Interactions of Ministry of Education College of Resources and Environmental Sciences China Agricultural University Beijing 100193 PR China

Cairo University Faculty of Agriculture Soil Science Department Giza 12613 Egypt

College of Environmental Science and Engineering Yangzhou University 196 W Huayang Rd Yangzhou Jiangsu PR China

Department of Environmental Geosciences Faculty of Environmental Sciences Czech University of Life Sciences Prague Kamýcká 129 16500 Praha 6 Suchdol Czech Republic

Department of Environmental Sciences COMSATS University Islamabad Vehari Campus Vehari Pakistan

Department of Science and Environmental Studies The Education University of Hong Kong Tai Po New Territories 999077 Hong Kong PR China

Institute of Soil and Environmental Sciences University of Agriculture Faisalabad Faisalabad 38040 Pakistan

Soils Department Faculty of Agriculture Mansoura University 35516 Mansoura Egypt

State Key Laboratory of Subtropical Silviculture Zhejiang A and F University Hangzhou 311300 PR China; Department of Soil Sciences Faculty of Agriculture Ain Shams University Cairo 11241 Egypt; Department of Renewable Resources 442 Earth Sciences Building University of Alberta Edmonton Alberta T6G 2E3 Canada

University of Wuppertal School of Architecture and Civil Engineering Institute of Foundation Engineering Water and Waste Management Laboratory of Soil and Groundwater Management Pauluskirchstraße 7 42285 Wuppertal Germany; King Abdulaziz University Faculty of Meteorology Environment and Arid Land Agriculture Department of Arid Land Agriculture 21589 Jeddah Saudi Arabia; University of Kafrelsheikh Faculty of Agriculture Department of Soil and Water Sciences 33516 Kafr El Sheikh Egypt

University of Wuppertal School of Architecture and Civil Engineering Institute of Foundation Engineering Water and Waste Management Laboratory of Soil and Groundwater Management Pauluskirchstraße 7 42285 Wuppertal Germany; University of Sejong Department of Environment Energy and Geoinformatics Guangjin Gu Seoul 05006 Republic of Korea

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AMOchar: an amorphous MnOx functionalized biochar to stabilize metal(loid)s in soil and optimize phytostabilization