Nanoarchitectonics and Kinetics Insights into Fluoride Removal from Drinking Water Using Magnetic Tea Biochar

Imtiaz Ashraf, Rong Li (), Bin Chen, Nadhir Al-Ansari (), Muhammad Rizwan Aslam, Adnan Raza Altaf and Ahmed Elbeltagi
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Imtiaz Ashraf: School of Chemical Engineering, Northwest University, Xi’an 710069, China
Rong Li: School of Chemical Engineering, Northwest University, Xi’an 710069, China
Bin Chen: School of Chemical Engineering, Northwest University, Xi’an 710069, China
Nadhir Al-Ansari: Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 97187 Luleå, Sweden
Muhammad Rizwan Aslam: College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310027, China
Adnan Raza Altaf: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Ahmed Elbeltagi: Agricultural Engineering Department, Faculty of Agriculture, Mansoura University, Mansoura 35516, Egypt

IJERPH, 2022, vol. 19, issue 20, 1-21

Abstract: Fluoride contamination in water is a key problem facing the world, leading to health problems such as dental and skeletal fluorosis. So, we used low-cost multifunctional tea biochar (TBC) and magnetic tea biochar (MTBC) prepared by facile one-step pyrolysis of waste tea leaves. The TBC and MTBC were characterized by XRD, SEM, FTIR, and VSM. Both TBC and MTBC contain high carbon contents of 63.45 and 63.75%, respectively. The surface area of MTBC (115.65 m 2 /g) was higher than TBC (81.64 m 2 /g). The modified biochar MTBC was further used to remediate the fluoride-contaminated water. The fluoride adsorption testing was conducted using the batch method at 298, 308, and 318 K. The maximum fluoride removal efficiency ( E %) using MTBC was 98% when the adsorbent dosage was 0.5 g/L and the fluoride concentration was 50 mg/L. The experiment data for fluoride adsorption on MTBC best fit the pseudo 2nd order, rather than the pseudo 1st order. In addition, the intraparticle diffusion model predicts the boundary diffusion. Langmuir, Freundlich, Temkin, and Dubnin–Radushkevich isotherm models were fitted to explain the fluoride adsorption on MTBC. The Langmuir adsorption capacity of MTBC = 18.78 mg/g was recorded at 298 K and decreased as the temperature increased. The MTBC biochar was reused in ten cycles, and the E % was still 85%. The obtained biochar with a large pore size and high removal efficiency may be an effective and low-cost adsorbent for treating fluoride-containing water.

Keywords: waste tea feedstock; magnetic sorbent; defluoridation; water treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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