Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg) Removal, and Regenerable Performance of Magnetic Tea Biochar

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2021 Sep 27

PMID 34568670

Citations 4

Authors

Adnan Raza Altaf

Haipeng Teng

Liu Gang

Yusuf G Adewuyi

Maosheng Zheng

Affiliations

Soon will be listed here.

Abstract

Elemental mercury (Hg) removal from a hot gas is still challenging since high temperature influences the Hg removal and regenerable performance of the sorbent. In this work, a facile yet innovative sonochemical method was developed to synthesize a thermally stable magnetic tea biochar to capture the Hg from syngas. A sonochemically synthesized magnetic sorbent (TUF) exhibited a more prodigious surface area with developed pore structures, ultra-paramagnetic properties, and high dispersion of FeO/γ-FeO particles than a simply synthesized magnetic sorbent (TF). The results showed that TUF demonstrated strong thermostability and attained a high Hg removal performance (∼98.6%) at 200 °C. After the 10th adsorption/regeneration cycle, the Hg removal efficiency of TUF was 19% higher than that of TF. Besides, at 23.1% Hg breakthrough, TUF achieved an average Hg adsorption capacity of 16.58 mg/g within 24 h under complex syngas (20% CO, 20% H, 5% HO, and 400 ppm HS). In addition, XPS results revealed that surface-active components (Fe, O, O*, C=O) were the key factor for high Hg removal performance over TUF from syngas. Hence, sonochemistry is a promising practical tool for improving the surface morphology, thermal resistance, renewability, and Hg removal efficiency of a sorbent.

Citing Articles

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