Environmental fate and ecological impact of the potentially toxic elements from the geothermal springs

Wang, Yafeng; Cheng, Hefa

doi:10.1007/s10653-023-01628-2

Cited by 1 publication

(1 citation statement)

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“…In the process of geothermal resource development, fluoride sinks into nearby rivers with the hot spring water through runoff, resulting in higher fluoride concentrations in the rivers flowing through the town of Yambajing, Lhasa, Tibet, where there are many geothermal hot springs. It has been shown that the fluoride concentration in the neighboring rivers reaches 23.9 mg/L [2], which is much higher than the upper limit of fluoride concentration in drinking water (1.5 mg/L) stipulated by the World Health Organization (WHO), resulting in fluoride pollution [3]. Tibet functions as an Asian water tower, so fluoride pollution control from geothermal hot springs is of great significance to the water ecological environment and human health.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Lanthanum-Modified Tea Waste Biochar and Its Adsorption Performance on Fluoride in Water

Li,

Xie,

Zhou

et al. 2024

Materials

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In this study, tea waste was used as a raw material, and TBC (tea waste biochar) was prepared by pyrolysis at 700 °C. La(NO3)3·6H2O was used as the modifier to optimize one-way modification; the orthogonal experiment was undertaken to determine the optimal preparation conditions; and La-TBC (lanthanum-modified biochar) was obtained. The key factors for the adsorption of fluoride by La-TBC were investigated by means of batch adsorption experiments, and kinetics and isothermal adsorption experiments were carried out on the adsorption of fluoride in geothermal hot spring water. The adsorption mechanism of fluoride by La-TBC was analyzed via characterization methods such as SEM-EDS (Scanning Electron Microscope and Energy Dispersive Spectrometer), BET (Brunauer–Emmett–Teller), FTIR (Fourier transform infrared), XRD (X-ray diffraction), and so on. The results show that La-TBC had the best adsorption effect on fluoride at pH 7. The process of adsorption of fluoride follows the pseudo-second-order kinetics and Langmuir isothermal model, and the maximum theoretical adsorption quantity was 47.47 mg/g at 80 °C, while the removal rate of fluoride from the actual geothermal hot spring water reached more than 95%. The adsorption process was dominated by the monolayer adsorption of chemicals, and the mechanisms mainly include pore filling, ion exchange, and electrostatic interaction.

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Section: Introductionmentioning

confidence: 99%