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A novel magnetic clay-biochar composite (BNT-MBC) was fabricated by co-pyrolysis of bentonite and biomass after being impregnated with Fe (NO3)3\u00b79H2O. Its adsorption capacity for Cd(II) and methyl orange was approximately doubled, reaching a maximum of 26.22 and 63.34 mg\/g, and could be easily separated from the solution by using external magnets with its saturation magnetization of 9.71 emu\/g. A series of characterizations including surface morphology and pore structure, elemental analysis, functional group analysis and graphitization were carried out, showing that the specific surface area was increased 50 times by loading 20 wt.% bentonite, while its graphitization and oxygen-containing functional groups were also enhanced. The isotherm fitting indicated that Cd(II) was adsorbed in multiple layers, while methyl orange was in both monolayer and multilayer adsorptions. The kinetic fitting indicated that chemisorption was the rate-limiting step of both, and it was also a complex process controlled by two steps with the fitting of intra-particle diffusion. In the binary system of Cd(II) and methyl orange, the co-existing pollutants facilitated the adsorption of the original one, and there was no competition between adsorption sites of Cd(II) and methyl orange. BNT-MBC also exhibited good reusability and can be magnetically recovered for recycling. Thus, the magnetic clay-biochar composite BNT-MBC is a cost-effective and promising adsorbent for simultaneous removing Cd(II) and methyl orange from wastewater.<\/jats:p>","DOI":"10.3390\/ijms24065755","type":"journal-article","created":{"date-parts":[[2023,3,17]],"date-time":"2023-03-17T05:36:01Z","timestamp":1679031361000},"page":"5755","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Characterization and Co-Adsorption Mechanism of Magnetic Clay-Biochar Composite for De-Risking Cd(II) and Methyl Orange Contaminated Water"],"prefix":"10.3390","volume":"24","author":[{"given":"Fengxiao","family":"Zhao","sequence":"first","affiliation":[{"name":"Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China"},{"name":"School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China"},{"name":"Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Fujian Engineering and Research Center of Clean and High-Valued Technologies for Biomass, College of Energy, Xiamen University, Xiamen 361102, China"},{"name":"CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Shan","sequence":"additional","affiliation":[{"name":"Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China"},{"name":"School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China"},{"name":"CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuang","family":"Li","sequence":"additional","affiliation":[{"name":"Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China"},{"name":"School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China"},{"name":"CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haoran","family":"Yuan","sequence":"additional","affiliation":[{"name":"Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China"},{"name":"School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China"},{"name":"CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Chen","sequence":"additional","affiliation":[{"name":"Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China"},{"name":"School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou 510640, China"},{"name":"Xiamen Key Laboratory of Clean and High-Valued Utilization for Biomass, Fujian Engineering and Research Center of Clean and High-Valued Technologies for Biomass, College of Energy, Xiamen University, Xiamen 361102, China"},{"name":"CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"L\u00f3pez-Rodr\u00edguez, D., Mic\u00f3-Vicent, B., Jord\u00e1n-N\u00fa\u00f1ez, J., Bonet-Aracil, M., and Bou-Belda, E. 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