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Different photoreduction processes of Cr(VI) on cellulose-rich and lignin-rich biochar by Zhengyang E; Jianjun Liang; Yaqiong Dong; Qian Chao; Ping Li; Qiaohui Fan is a Environmental Science article available to read on EtoBox.

What is Different photoreduction processes of Cr(VI) on cellulose-rich and lignin-rich biochar about?

In this study, a series of biochar were prepared via pyrolyzing cellulose-rich pakchoi (PBC) and lignin-rich corncob (CBC) to explore the photoreduction process of Cr(VI). X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy confirmed higher oxygenated functional groups in PBC (48.9%-57.1%), whereas CBC exhibited more aromatization properties due to the stable aromatic network in lignin. For PBC, the valence bands decreased from 1.42 eV to 1.20 eV with the increase of pyrolysis temperature from 300 • C to 500 • C; however, an opposite trend was observed for CBC. The photoreduction of Cr(VI) clearly showed that both PBC and CBC had the best performance at the carbonization temperature of 300 • C (named PBC300 and CBC300). It is noted that PBC300 exhibited the most effective photoreduction of Cr(VI), which was about 1.3 times higher than that of CBC300. The maximum reduction capacities of Cr(VI) were 68.2 mg g -1 on PBC300 and 66.1 mg g -1 on CBC300 at pH~2.0. Compared with the insoluble char substances, dissolved black carbons made more contributions for Cr(VI) photoreduction, ~70% in PBC and almost 100% in CBC, which suggested that in the case of PBC, the in

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Author

Zhengyang E; Jianjun Liang; Yaqiong Dong; Qian Chao; Ping Li; Qiaohui Fan

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)