Heterostructured Bi2S3@NH2-MIL-125(Ti) nanocomposite as a bifunctional photocatalyst for Cr(vi) reduction and rhodamine B degradation under visible light

Minghua Wang; Longyu Yang; Jinyun Yuan; Linghao He; Yingpan Song; Hongzhong Zhang; Zhihong Zhang; Shaoming Fang

doi:10.1039/c8ra00882e

Heterostructured Bi₂S₃@NH₂-MIL-125(Ti) nanocomposite as a bifunctional photocatalyst for Cr(vi) reduction and rhodamine B degradation under visible light

RSC Adv. 2018 Apr 3;8(22):12459-12470. doi: 10.1039/c8ra00882e. eCollection 2018 Mar 26.

Authors

Minghua Wang^{1

2}, Longyu Yang², Jinyun Yuan², Linghao He^{1

2}, Yingpan Song², Hongzhong Zhang¹, Zhihong Zhang^{1

2}, Shaoming Fang^{1

2}

Affiliations

¹ Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration P. R. China.
² Henan Provincial Key Laboratory of Surface & Interface Science, Zhengzhou University of Light Industry Zhengzhou 450001 P. R. China [email protected] [email protected].

Abstract

A series of bismuth sulfide (Bi₂S₃) nanorods and amine-functionalized Ti-based metal-organic framework heterojunctions [denoted by Bi₂S₃@NH₂-MIL-125(Ti)] were constructed and explored as bifunctional photocatalysts for Cr(vi) reduction and rhodamine B (RhB) degradation under visible light illumination. Compared with the individual NH₂-MIL-125(Ti) and Bi₂S₃, the as-synthesized Bi₂S₃@NH₂-MIL-125(Ti) photocatalyst exhibited an enhanced photocatalytic activity toward Cr(vi) and RhB owning to the synergetic effect between Bi₂S₃ and NH₂-MIL-125(Ti). Moreover, the Bi₂S₃@NH₂-MIL-125(Ti) heterojunctions showed increased Cr(vi) removal efficiency by adding RhB in the system. The photocatalytic mechanism was proposed based on the analysis of different scavenger for active species and electron spin resonance spectrometry. The introduction of Bi₂S₃ into NH₂-MIL-125(Ti) can extend the light adsorption and improve the transfer and separation of photogenerated charge carriers through the Bi₂S₃@NH₂-MIL-125(Ti) heterojunction with unique band gap structure. The synthesized Bi₂S₃@NH₂-MIL-125(Ti) photocatalyst also exhibited good reusability and stability.