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Two biochar materials, namely, sewage sludge\u00a0biochar and woodchips\u00a0biochar, were prepared at two different temperatures, viz., 450 and 700 \u00b0C. These biochars were further modified with magnetic nanoparticles (Fe\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    ). The modified biochar nanocomposites were characterized using field emission\u2013scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer\u2013Emmett\u2013Teller (BET), SQUID analysis, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR). The potential of prepared adsorbents was examined for the removal of hexavalent chromium (Cr(VI)) and Acid orange 7 (AO7) dye from water as a function of various parameters, namely, contact time, pH of solution, amount of adsorbents, and initial concentrations of adsorbates. Various kinetic and isotherm models were tested to discuss and interpret the adsorption mechanisms. The maximum adsorption capacities of modified biochars were found as 80.96 and 110.27\u00a0mg g\n                    <jats:sup>-1<\/jats:sup>\n                    for Cr(VI) and AO7, respectively. Magnetic biochars showed high pollutant removal efficiency after 5 cycles of adsorption\/desorption. The results of this study revealed that the prepared adsorbents can be successfully used for multiple cycles to remove\u00a0Cr(VI) and AO7 from water.\n                  <\/jats:p>","DOI":"10.1007\/s11356-020-09275-1","type":"journal-article","created":{"date-parts":[[2020,6,9]],"date-time":"2020-06-09T21:02:26Z","timestamp":1591736546000},"page":"32874-32887","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":203,"title":["Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution"],"prefix":"10.1007","volume":"27","author":[{"given":"Chella","family":"Santhosh","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0654-6536","authenticated-orcid":false,"given":"Ehsan","family":"Daneshvar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kumud Malika","family":"Tripathi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pranas","family":"Baltr\u0117nas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"TaeYoung","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edita","family":"Baltr\u0117nait\u0117","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amit","family":"Bhatnagar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,6,10]]},"reference":[{"key":"9275_CR1","doi-asserted-by":"crossref","unstructured":"Ahmadi A, Foroutan R, Esmaeili H, Tamjidi S (2020) The role of bentonite clay and bentonite clay@ MnFe2O4 composite and their physico-chemical properties on the removal of Cr (III) and Cr (VI) from aqueous media. 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