Effective adsorption of heavy metal ions in water by sulfhydryl modified nano titanium dioxide

Abstract

Background: The monitoring and removal of heavy metal ions in wastewater will effectively improve the quality of water and promote the green and sustainable development of ecological environment. Using more efficient adsorption materials and more accurate detection means to treat heavy metal ions in water has always been a research focus and target of researchers.Method: A novel titania nanomaterial was modified with sulfhydryl group (nano TiO2-SH) for detection and adsorption of heavy metal ions in water, and accurately characterize the adsorption process using Surface-Enhanced Raman Spectroscopy (SERS) and other effective testing methods.Results: The maximum adsorption efficiency of nano TiO2-SH for the Hg2+, Cd2+, Pb2+ three heavy metal ions reached 98.3%, 98.4% and 98.4% respectively. And more importantly, after five cycles of adsorption and desorption, the adsorption efficiency of nano TiO2-SH for these three metal ions is still above 96%.Conclusion: These results proved the nano TiO2-SH adsorbent has great potential in practical water pollution purification.

Treatment of Cadmium-Contaminated Water Systems Using Modified Phosphate Rock Powder: Contaminant Uptake, Adsorption Ability, and Mechanisms

“…A weak characteristic Mn-O vibration peak appeared at 529 cm −1 in the MMPRP spectrum [47]. However, the SMPRP spectrum had no obvious characteristic -SH peak at 2550 cm −1 , possibly because of the severe reduction in the -SH group content of this sample after washing, which resulted in no characteristic peak [48]. The characteristic peak of SMPRP at 1454 cm −1 was weaker than that of the other PRPs, possibly due to the hydrolysis of H 2 PO 4 − .…”

High-Efficiency Adsorption of Cr(VI) and Mn(VII) from Wastewater by a Two-Dimensional Copper-Based Metal–Organic Framework

“… 5 They pose a threat to the environment and human health and safety. At present, there are many methods to remove high-valence heavy metal ions, such as chemical precipitation, 6 photocatalytic reduction, 7 electrochemical reduction, 8 and adsorption. 9 In the field of wastewater treatment, adsorption is a transfer process between two liquid–solid phases.…”