Enhanced Adsorption of Aqueous Tetracycline Hydrochloride on Renewable Porous Clay-Carbon Adsorbent Derived from Spent Bleaching Earth via Pyrolysis

Langmuir : the ACS Journal of Surfaces and Colloids
Dongjin WanShuhu Xiao

Abstract

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 various characterization methods show that the adsorption mechanisms mainly included π-π 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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Citations

Aug 21, 2020·Environmental Science and Pollution Research International·Wenjie LiuChao Yao
Jun 22, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Yongde LiuShuhu Xiao
Nov 17, 2020·The Science of the Total Environment·Wei WangHongbing Yang
Jun 10, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Seyfeddine RahaliAbueliz Modwi

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