High-efficiency adsorption of tetracycline by the prepared waste collagen fiber-derived porous biochar. Issue 67 (29th November 2019)

• Record Type: Journal Article
• Authors: Wei, Xinxing; Zhang, Renjing; Zhang, Wenchao; Yuan, Yue; Lai, Bo
• Is Part Of: RSC advances. Volume 9:Issue 67(2019)
• Page Start: 39355
• Page End: 39366
• Publication Date: 2019-11-29
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra07289f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Porous biochar (PBC) derived from Cr-containing waste collagen fibers was prepared by two-step pyrolysis to 800 °C (PBC-800) and alkali activation. Abstract : Porous biochar (PBC) derived from Cr-containing waste collagen fibers was prepared by two-step pyrolysis to 800 °C (PBC-800) and alkali activation. Brunauer–Emmet–Teller (BET) analysis, scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), X-ray fluorescence (XRF), thermogravimetric analysis (TGA) and zeta potential analysis were used to characterize PBC-800. Batch experiments showed that PBC-800 had an excellent removal effect on tetracycline (TC), and the maximum adsorption capacity was 593.84 mg g −1 . Meanwhile, PBC-800 was found to be suitable for a wide pH range. The isothermal adsorption and kinetic model fitting proved that the TC adsorption by PBC-800 occurred via 5 types of chemical adsorption. The main rate-limiting step was closely related to the initial concentration of TC. The total release of Cr was less than 0.05 mg L −1, which indicated that PBC-800 was stable and did not cause serious secondary pollution. Compared to the conventional metal-free biomass, Cr in a waste collagen fiber (WCF) played an important role in carbon formation and adsorption. The excellent adsorption properties of PBC-800 indicated that it could enrich low concentrations of TC in water. Thus, WCF can be used to prepare cost-effective PBC, which supplies a new process to reuse Cr-containing waste.