One-step synthesis of renewable magnetic tea-biochar derived from waste tea leaves for the removal of Hg0 from coal-syngas

Altaf, Adnan Raza; Teng, Haipeng; Zheng, Maoshen; Ashraf, Imtiaz; Arsalan, Muhammad; Rehman, Ata Ur; Liu, Gang; Wang, Pengjie; Yong-qiang, Ren; Li, Xiaoyü

doi:10.1016/j.jece.2021.105313

Cited by 43 publications

(36 citation statements)

References 29 publications

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“…Tea waste collection and sample preparation are well described in our previous work. 11 A stepwise cost analysis (in USD) is given below:…”

Section: Hgmentioning

confidence: 99%

“…28 Coincidentally, Altaf et al investigated that Fe(NO 3 ) 3 -laden biochar reveals an ultramagnetic property with an excellent Hg 0 removal performance of about 96% from simulated syngas. 11 Likewise, Yang et al reported that Fe modification promotes the Hg 0 removal efficiency at high temperatures with the strongest magnetism in the flue gas. 29 In addition, the regenerable property makes the Fe sorbent a recyclable material for mercury removal.…”

Section: Introductionmentioning

confidence: 99%

“…To date, upstream sorbent injection is the most common and feasible approach to capturing Hg 0 from syngas, − for which choosing an effective and economical sorbent is a crucial step. Activated carbon (AC) has been a widely employed sorbent to control Hg 0 pollution from thermal power plants .…”

Section: Introductionmentioning

confidence: 99%

“…George et al studied that iron oxide-modified sorbents exhibit an excellent removal performance of multiple air pollutants in hot gas . Coincidentally, Altaf et al investigated that Fe(NO 3 ) 3 -laden biochar reveals an ultramagnetic property with an excellent Hg 0 removal performance of about 96% from simulated syngas . Likewise, Yang et al reported that Fe modification promotes the Hg 0 removal efficiency at high temperatures with the strongest magnetism in the flue gas .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar

et al. 2021

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Elemental mercury (Hg0) removal from a hot gas is still challenging since high temperature influences the Hg0 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 Hg0 from syngas. A sonochemically synthesized magnetic sorbent (TUF0.46) exhibited a more prodigious surface area with developed pore structures, ultra-paramagnetic properties, and high dispersion of Fe3O4/γ-Fe2O3 particles than a simply synthesized magnetic sorbent (TF0.46). The results showed that TUF0.46 demonstrated strong thermostability and attained a high Hg0 removal performance (∼98.6%) at 200 °C. After the 10th adsorption/regeneration cycle, the Hg0 removal efficiency of TUF0.46 was 19% higher than that of TF0.46. Besides, at 23.1% Hg0 breakthrough, TUF0.46 achieved an average Hg0 adsorption capacity of 16.58 mg/g within 24 h under complex syngas (20% CO, 20% H2, 5% H2O, and 400 ppm H2S). In addition, XPS results revealed that surface-active components (Fe+, O2–, O*, CO) were the key factor for high Hg0 removal performance over TUF0.46 from syngas. Hence, sonochemistry is a promising practical tool for improving the surface morphology, thermal resistance, renewability, and Hg0 removal efficiency of a sorbent.

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“…Tea waste collection and sample preparation are well described in our previous work. 11 A stepwise cost analysis (in USD) is given below:…”

Section: Hgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar

et al. 2021

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“…Ferrous nitrate Fe(NO 3 ) 3 is a safe and cheap chemical reagent that is commonly used as an oxidant in organic synthesis and a precursor of Fe 3 O 4 /γ-Fe 2 O 3 . 40 …”

Section: Introductionmentioning

confidence: 99%

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg⁰ in Flue Gas

Huo

Chen

et al. 2022

ACS Omega

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Elemental mercury (Hg 0 ) emission from industrial boilers equipped in factories such as coal-fired power plants poses serious hazards to the environment and human health. Herein, an iron-modified biomass carbon (Fe/BC) magnetic adsorbent was prepared by a one-step method using pepper straw waste as raw material and potassium oxalate and ferric nitrate as activator and catalyst precursor, respectively. A fixed-bed reactor was used to evaluate the Hg 0 removal performance of the Fe/BC adsorbent. The synthesized adsorbent showed a wide temperature window for Hg 0 removal. In a N 2 + O 2 atmosphere, the removal efficiency toward Hg 0 was 97.6% at 150 °C. Further, O 2 or SO 2 could promote the removal of Hg 0 , while NO could inhibit the conversion of Hg 0 over the Fe/BC adsorbent. The consequence of XPS and Hg-TPD showed that lattice oxygen in Fe 2 O 3 and chemisorbed oxygen were the main active sites for Hg 0 removal, and HgO was the main mercury species on used Fe/BC. Moreover, Fe/BC adsorbent showed a good regeneration and magnetization performance, which was conducive to the cost reduction of actual industrial application. This study provides a facile approach for efficient removal of Hg 0 using biomass-derived carbon material.

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Sustainable Utilization of Tea Waste

Debnath

Purkait

2023

Sustainable Development and Biodiversity

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One-step synthesis of renewable magnetic tea-biochar derived from waste tea leaves for the removal of Hg0 from coal-syngas

Cited by 43 publications

References 29 publications

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg⁰ in Flue Gas

Sustainable Utilization of Tea Waste

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One-step synthesis of renewable magnetic tea-biochar derived from waste tea leaves for the removal of Hg0 from coal-syngas

Cited by 43 publications

References 29 publications

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg0) Removal, and Regenerable Performance of Magnetic Tea Biochar

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg0) Removal, and Regenerable Performance of Magnetic Tea Biochar

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg0 in Flue Gas

Sustainable Utilization of Tea Waste

Contact Info

Product

Resources

About

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar

Effect of Sonochemical Treatment on Thermal Stability, Elemental Mercury (Hg⁰) Removal, and Regenerable Performance of Magnetic Tea Biochar

Biomass Carbon Magnetic Adsorbent Constructed by One-Step Activation Method for the Removal of Hg⁰ in Flue Gas