Fine Characterization of Natural SiO2-Doped Catalyst Derived from Mussel Shell with Potential Photocatalytic Performance for Organic Dyes

Abstract

In this work, a SiO2-doped natural photocatalyst derived from waste mussel shell (HAS) was prepared by acidification. The as-prepared sample was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), inductively coupled plasma-optical emission spectroscopy (ICP-OES), field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-visible diffuse-reflectance spectrum (UV-vis DRS), and Differential scanning and thermogravimetric analyses (DTA/TGA). The results exhibited that HAS was mesopores nanomaterial consisting of uneven arranged rod-like structure, the dominant component of HAS was SiO2 with a large number of hydroxyl groups, and a variety of transition metals uniformly distributed in HAS. Rhodamine B (RhB) and methylene blue (MB) removal efficiencies (equal to 92.59% and 99.14%, respectively) were observed under the HAS presence when exposed to the visible light. The degradation products were analyzed using liquid Chromatograph Mass Spectrometer (LC-MS) and Total Organic Carbon (TOC), among which, MB was degraded by demethylation and deamination, and RhB was degraded by N-deethylation and conjugate structure destruction. After four successive recycles, the removal efficiency of RhB and MB are still reach 86.103% and 75.844%. This study indicated that the mussel shells might be suggested as a novel natural photocatalyst in the application of dye wastewater treatment.

Hybrid Composite of Sn(IV)-Porphyrin and Mesoporous Structure for Enhanced Visible Light Photocatalytic Degradation of Organic Dyes

“…Finally, these lower-molecular-weight intermediate molecules were further fragmented and mineralized into CO 2 and H 2 O. The total organic carbon (TOC) value was calculated to estimate the removal of the EG dye by photocatalysts [ 47 ]. The TOC removal percentage attained using SnP@MCM−41 was only 75%.…”

Review of shell waste reutilization to promote sustainable shellfish aquaculture

“…72 The catalytic activity of calcined shell wastes can also be applied in electrochemical cells, environmental remediation and organic synthesis. [73][74][75] An Ag/Zn 2 O/CaCO 3 composite constructed using oyster shells as a solid catalytic support exhibited excellent performance at reducing 4-nitrophenol, with a conversion rate of 97.6% within 8 min. 76 Shells have good application prospects in the field of catalysis, but their catalytic applications are usually based on calcium oxide.…”