Preparation, characterization, and adsorption properties of modified carbon nanotubes for highly effective removal of tetracycline from aquaculture wastewater

Abstract

In this study, the adsorption of the antibiotic compound tetracycline (TC) from aquaculture wastewater was investigated using lanthanum-modified carbon nanotubes (La-CNTs) prepared by impregnation method. The composition and morphology of La-CNTs were characterized by EDS, XRD, and BET analysis. Single-factor experiments were performed to investigate their effect on the adsorption of TC by La-CNTs. The adsorption kinetics and adsorption isotherms indicated that the pseudo-second-order kinetic model and Langmuir adsorption isotherm equation adequately described the adsorption behavior of La-CNTs. Moreover, the maximum adsorption capacity (Q m ) was 93.46 mg/g. The thermodynamics studies indicated that adsorption of TC by La-CNTs were endothermic and spontaneous respectively.Further, the adsorption force of La-CNTs on TC could be attributed to van der Waals force, π-π adsorbate-adsorbent interaction and electrostatic interaction. Based on these experimental results, this novel composite material shows good potential application value for the removal of TC from aquaculture wastewater.

Preparation and adsorption kinetics and thermodynamics of sodium humate‐modified diatomite

“…In the adsorption system, the solution pH is a factor that cannot be ignored. 26 On the one hand, it affects the charge distribution on the adsorbent surface, 27 on the other hand it influences the presence of tetracycline in water, 28 showing anionic, cationic, or zwitterionic forms at different pHs 29 ; in strong acid environments, the lower molecule is positively charged and negatively charged under strong alkaline conditions. 30 When pH < 3.3, TC molecules are present in the form of cationic TCH 3+ , at 3.3 < pH < 7.7, they are mainly present as TCH 2 0 , at pH > 7.7, they are mainly anionic TCH − and TC 2− .…”

Valorization of Plastic Wastes for the Development of Adsorbent Designed for the Removal of Emerging Contaminants in Wastewater

“…In this phenomenon, the adsorbent is crucial to the adsorption of contaminants [99]. The chemical and physical interactions are intense, quick equilibrium, extraordinary sorbent capacity, and distinctive superficial chemistry of CNTs were considered to make them superior to conventional sorbents like clay, zeolite, and activated carbon for the treatment of a variety of organic and inorganic pollutants [100]. Table 2 shows a few works of literature on applying CNTs to eliminate various contaminants from WW via the adsorption technique.…”