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LignoPhot: Photoactive Hybrid lignin/Bi4O5Br2/BiOBr Composite for Complex Pollutants Removal

preprint
submitted on 11.01.2021, 17:38 and posted on 12.01.2021, 12:40 by Tetyana Budnyak, Joy Onwumere, Ievgen V. Pylypchuk, Aleksander Jaworski, Jianhong Chen, Anna Rokicińska, Mikael E. Lindström, Piotr Kustrowski, olena Sevastyanova, Adam Slabon
Valorization of lignin is still an open question and lignin has therefore remained an underutilized biomaterial. This situation is even more pronounced for hydrolysis lignin, which is characterized by a highly condensed and excessively cross-linked structure. We report on photoactive lignin/Bi4O5Br2/BiOBr bio-inorganic composites consisting of a lignin substrate that is coated by Bi4O5Br2/BiOBr nanosheet photocatalysts. The structure of the hybrid material was investigated by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy including energy dispersive X-ray (EDX) spectroscopy, and solid state 1H−13C nuclear magnetic resonance spectroscopy (1H−13C NMR). The material contains 18.9% of Bi4O5Br2/BiOBr and was found to be effective for the photocatalytic degradation of cationic methylene blue (MB) and zwitterionic rhodamine B (RhB) dyes under irradiation with 405 nm light. Lignin/Bi4O5Br2/BiOBr was able to decrease the dye concentration from 80 mg·L–1 to 12.3 mg·L–1 for RhB (85%) and from 80 mg·L–1 to 4.4 mg·L–1 for MB (95%). Complementary to the dye degradation, the lignin as a main component of the composite, was found to be efficient and rapid biosorbent for metal ions in aqueous solutions. The highest adsorption capacity was found after 2 hours of phases contact and reached 0.45 mmol·g–1 for Ni(II) ions (neutral media). The low cost, simplicity of the synthesis, good stability and ability to simultaneously photooxidize organic dyes and to adsorb metal ions, make the developed photoactive lignin/Bi4O5Br2/BiOBr composite a prospective material for textile wastewaters remediation

Funding

Swedish Foundation for Strategic Environmental Research (project: Mistra SafeChem, project number 2018/11).

ÅForsk Foundation (grant number 19-676)

Wood and Pulping Chemistry Research Network (WPCRN)

European Regional Development Fund in the framework of the Polish Innovation Operational Program (contract no. POIG.02.01.00-12-023/08)

History

Email Address of Submitting Author

adam.slabon@mmk.su.se

Institution

Stockholm University

Country

Sweden

ORCID For Submitting Author

0000-0002-4452-1831

Declaration of Conflict of Interest

no conflict of interest to declare.

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