4.7 Article

Mechanochemical modified nitrogen-rich biochar derived from shrimp shell: Dominant mechanism in pyridinic-N for aquatic methylene blue removal

Journal

JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 329, Issue -, Pages -

Publisher

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.117049

Keywords

Ball milling; N -rich biochar; Pyridinic-N; Methylene blue; Adsorption

Funding

  1. Natural Science Foundation of Jiangsu Province, China [SBK2022020100]
  2. Major Basic Research Project of the Natural Science Foundation of the Jiangsu Higher Education In- stitutions, China [22KJA610004]
  3. Postgraduate Research and Practice Innovation Program of Yancheng Institute of Technology, China [KYCX21-XY006]

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N-doped biochar was prepared by calcining shrimp shells and then activated and post-modified to obtain a series of novel adsorbents. The modified biochar showed improved surface area, pore volume, and excellent adsorption performance. The results suggest that ball-milled shrimp shell biochar is a promising material for cation dye adsorption.
N-doping for the preparation of functional carbon materials is a trending research topic. In this study, N-rich biochar (BC) was prepared by calcining naturally N rich shrimp shells under oxygen-limiting environment, and the calcining temperatures were controlled. BC were activated with 5% hydrochloric acid solutions and then post-modified with ball-milling to obtain a series of novel adsorbents (MBCs). All samples were characterized by SEM, BET, FT-IR, XRD, XPS, TG, and element analysis. Surface area, pore volume, and other surface functional groups were significantly improved after acidizing and ball-milling. The adsorption capacities for MB were MBC350 > MBC500 > MBC650 >BC350 > BC650 > BC500, and the equilibrium adsorption capacities were 575.01 mg/g, 506.52 mg/g, 424.59 mg/g, 113.31 mg/g, 93.53 mg/g and 86.25 mg/g, respectively. The excellent adsorption performance of MBCs for MB was ascribed to Lewis acid-base interaction, pi-pi interaction, electrostatic interaction and van der Waals, and the quinone group and pyridinic-N on the surface of the MBCs are identified as the major active sites. Taken together, ball-milled shrimp shell biochar is a promising material for cation dye adsorption.

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