Journal
LANGMUIR
Volume 35, Issue 11, Pages 3925-3936Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b04179
Keywords
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Funding
- National Natural Science Foundation of China [51878251]
- Young Teacher Foundation of Henan University of Technology [2014GGJS04]
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In this study, spent bleaching earth (SBE) and pyrolyzed SBE (SBE@C) were tested for their capacity to remove tetracycline hydrochloride (TCH) from aqueous solution. The maximum adsorption capacity obtained by the Langmuir model is 0.114 mmol/g for SBE@C and 0.087 mmol/g for SBE. The deleterious effects of coexisting cations were ranked in a decline: Al3+ > Mg2+ > Na+. The results of adsorption various characterization methods show that the adsorption mechanisms mainly included pi-pi interactions, hydrogen bonding, electrostatic interactions, and changes in physical and chemical properties. After 3 repeated cycles of pyrolysis, the adsorption capacity of SBE@C remained at 85.4%, with SBE@C potentially recycled 21 times before complete loss of adsorption capacity. Furthermore, the problem of secondary pollution caused by SBE and residual oil is resolved by the use of SBE@C. All results indicate that SBE@C is a likely candidate for the treatment of TCH wastewater in the coming practical applications.
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