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However, the high solubility of CS in acidic solution would make it difficult to recycle the adsorbent from the liquid phase. In this study, the CS\/Fe3O4 was prepared via Fe3O4 nanoparticles immobilized onto a CS surface, and the DCS\/Fe3O4-Cu was further fabricated after surface modification and the adsorption of Cu ions. The meticulously tailored material displayed the sub-micron size of an agglomerated structure with numerous magnetic Fe3O4 nanoparticles. During the adsorption of methyl orange (MO), the DCS\/Fe3O4-Cu delivered a superior removal efficiency of 96.4% at 40 min, which is more than twice the removal efficiency of 38.7% for pristine CS\/Fe3O4. At an initial MO concentration of 100 mg L\u22121, the DCS\/Fe3O4-Cu exhibited the maximum adsorption capacity of 144.60 mg g\u22121. The experimental data were well explained by the pseudo-second-order model and Langmuir isotherm, suggesting the dominant monolayer adsorption. The composite adsorbent still maintained a large removal rate of 93.5% after five regeneration cycles. This work develops an effective strategy to simultaneously achieve high adsorption performance and convenient recyclability for wastewater treatment.<\/jats:p>","DOI":"10.3390\/molecules28052307","type":"journal-article","created":{"date-parts":[[2023,3,3]],"date-time":"2023-03-03T01:43:00Z","timestamp":1677807780000},"page":"2307","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Recyclable Magnetic Iron Immobilized onto Chitosan with Bridging Cu Ion for the Enhanced Adsorption of Methyl Orange"],"prefix":"10.3390","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9120-3070","authenticated-orcid":false,"given":"Daoguang","family":"Teng","sequence":"first","affiliation":[{"name":"Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China"},{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Jin","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenhuan","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiang","family":"Liu","sequence":"additional","affiliation":[{"name":"Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China"},{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Wang","sequence":"additional","affiliation":[{"name":"Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China"},{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Li","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yijun","family":"Cao","sequence":"additional","affiliation":[{"name":"Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China"},{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ling","family":"Zhang","sequence":"additional","affiliation":[{"name":"Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China"},{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Zhang","sequence":"additional","affiliation":[{"name":"Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China"},{"name":"School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"63","DOI":"10.1016\/j.watres.2019.01.010","article-title":"Life cycle assessment of wastewater treatment in developing countries: A review","volume":"153","author":"Tarpani","year":"2019","journal-title":"Water Res."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"130288","DOI":"10.1016\/j.chemosphere.2021.130288","article-title":"Fabrication of cylindrical 3D cellulose nanofibril (CNF) aerogel for continuous removal of copper (Cu2+) from wastewater","volume":"278","author":"Hong","year":"2021","journal-title":"Chemosphere"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"120262","DOI":"10.1016\/j.seppur.2021.120262","article-title":"In-situ fabrication of surfactant modified CNT-based novel bio-composite and its performance evaluation for simultaneous removal of anionic dyes: Optimization by Box-Behnken design","volume":"284","author":"Yadav","year":"2022","journal-title":"Sep. 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