Abstract
This work investigated the removal of antibiotic tetracycline (TC) from wastewater using nanocomposite material based on laterite modified with polyanion, polystyrene sulfonate (PSS). The effective factors influenced on the TC removal using nanocomposite PSS-modified laterite (NCPML) were optimized and found to be pH 4, solid-liquid ratio 5 mg/mL, and contact time 180 min. The highest removal of TC reached about 88% under the optimum adsorption conditions. The adsorption isotherm and kinetics of TC adsorption onto NCPML were in good agreement with the Langmuir and pseudo-second-order models, respectively. The characteristics of the NCPML material before and after TC adsorption were examined by zeta (ζ) potential measurements, Brunauer–Emmett–Teller (BET) method, and Fourier transform infrared spectroscopy (FT-IR). The TC adsorption onto NCPML was induced by electrostatic interaction, hydrogen bonding, and diffusion interaction. The TC removal from wastewater was approximately 94% while efficiency still reached 66% after five regenerations. Our research reveals that NCPML is a high-performance adsorbent for TC removal from wastewater.
Highlights
Nanocomposite material based on polymer-coated substrate is a hybrid adsorbent for pollutants removal [1,2,3]
E interfacial and physicochemical methods including ζ potential measurements, Brunauer–Emmett–Teller (BET), and Fourier transform infrared spectroscopy (FT-IR) were employed to evaluate the changes in material characterization before and after TC adsorption. e isotherms and kinetics of TC onto nanocomposite PSS-modified laterite (NCPML) were systematically investigated by experimental consideration and theoretical models. e reuse of NCPML and the application for TC removal in actual wastewater were investigated in this work
Effect of pH. e effect of pH on the TC removal using NCPML is shown in Figure 2. e experiment of pH effect was conducted in the pH range of 3–9 to find out the best pH for TC removal using NCPML
Summary
Nanocomposite material based on polymer-coated substrate is a hybrid adsorbent for pollutants removal [1,2,3]. Polyanion adsorption onto positively charged minerals as a new composite material for antibiotics removal has not been reported. Tetracycline (TC) is a big antibiotic group that is widely used to treat animal and human diseases as well as an antibacterial in aquaculture activity [11, 12]. E material was modified by an anionic surfactant sodium dodecyl sulfate (SDS) for removal of different pollutants [31,32,33] Using polyanion such as polystyrene sulfonate (PSS) to modify laterite soil for TC removal is still a new study. E interfacial and physicochemical methods including ζ potential measurements, Brunauer–Emmett–Teller (BET), and Fourier transform infrared spectroscopy (FT-IR) were employed to evaluate the changes in material characterization before and after TC adsorption. e isotherms and kinetics of TC onto NCPML were systematically investigated by experimental consideration and theoretical models. e reuse of NCPML and the application for TC removal in actual wastewater were investigated in this work
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