- Title
- Removal of aqueous lead ions by iron ore tailings/straw biochar composite and its underlying sorption mechanism
- Creator
- Chen, Yongliang; Wang, Ling; Hassan, Masud; Liu, Yanju; Wang, Xuedong; Ren, Dajun
- Relation
- Desalination and Water Treatment Vol. 269, p. 176-187
- Relation
- https://www.deswater.com/vol.php?vol=269&oth=269|0|September%20%20|2022
- Publisher
- Taylor & Francis
- Resource Type
- journal article
- Date
- 2022
- Description
- A composite material was prepared from iron tailings and straw biochar for lead (Pb) removal from aqueous solution. Microscopic analysis revealed that the surface area of the composite was 131.84 m2/g and the porosity was predominantly an irregular mesoporous structure (~3.65 nm) in size, and the predominant mineral phases were identified as quartz, magnetite and calcite. The effects of solution pH, adsorbent dosage, contact time, initial sorbate concentration, and temperature on lead(II) removal were investigated. The results showed that the composite could remove 97.05% of lead(II), where solution pH was 5.0, adsorbent dosage was 1.00 g/L, and initial lead(II) concentration was 200 mg/L. The adsorption fitted well to the Langmuir isotherm model, demonstrated monolayer formation of lead ions onto the adsorbent, and the theoretical maximum adsorption capacity of lead(II) was 330.03 mg/g. Adsorption kinetics and thermodynamic indicated that the adsorption reaction was spontaneous and mainly controlled by chemisorption due to presence of abundance of oxygen-containing functional groups and active sites derived from straw and iron ore tailings could bond with lead(II), and columnar cerussite crystals from the reaction between Pb2+ 2– and CO3 released from the materials were fixed the surface and inside of the materials, improved lead(II) adsorption.
- Subject
- iron tailings; straw biomass; composite materials; biochar; lead; adsorption
- Identifier
- http://hdl.handle.net/1959.13/1499764
- Identifier
- uon:54785
- Identifier
- ISSN:1944-3994
- Language
- eng
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