Adsorption of heavy metal sewage on nano-materials such as titanate/TiO2 added lignin

TLDR: In this paper, the performance of the lignin-assisted synthesis of titanate nanotubes (WL-TNTs) was investigated and the results showed that WL TNTs had good adsorption effect on Pb2+, Cu2+ and Cd2+, especially Pb 2+ had a good effect over a wide pH range.

Abstract: Biomolecules (lignin) were used as additives for the synthesis of titanate/TiO2 nanomaterials, and their adsorption properties and photocatalytic properties were studied. They were based on corn stalks, cotton stalks, poplar twigs and willow shavings, respectively. Lignin was extracted from it to aid in the synthesis of titanate nanotube material. The products were characterized by XRD (X-Ray Diffraction), FESEM (Field emission scanning electron microscopy), TEM, FTIR (Fourier Transform Infrared Spectroscopy) and BET, and their adsorption properties were studied. The study found that by comparing the maximum adsorption capacity of heavy metal ions (Pb2+, Cu2+, Cd2+) with four different lignin-containing titanate nanotube materials, the adsorption performance of the lignin-assisted synthesis of titanate nanotubes (WL-TNTs) was optimal. WL-TNTs material had good adsorption effect on Pb2+, Cu2+ and Cd2+, especially Pb2+ had a good adsorption effect over a wide pH range (pH of 2–7). At pH = 6 (lead ion was 5.5) and at 25 °C, the maximum adsorption capacity of WL-TNTs for Pb2+, Cu2+ and Cd2+ reached 677.6 mg/g, 258.2 mg/g and 308.5 mg/g, respectively, and the adsorption rate was fast. The lead ions can be adsorbed almost completely in 5 min and the best dosage of adsorbent was only 0.2 g/L. At the same time, the material had excellent adsorption and analytical regeneration performance. It was a good and economical adsorbent and had broad application prospects.