Preparation of MgAl layered double oxides and its adsorption kinetics for ciprofloxacin hydrochloride in water. Issue 6 (7th June 2022)

• Record Type: Journal Article
• Authors: Gao, Ruqin; Huang, Yingrui; He, Jianling; Shi, Wenjie; Huang, Shiyu; Pan, Lu; Pan, Zhiyong; Li, Guoting
• Is Part Of: Environmental progress & sustainable energy. Volume 41:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-07
• Subjects: coprecipitation method -- kinetic model -- medicinal residue -- MgAl‐LDOs -- organic pollutant -- water treatment; Environmental engineering -- Periodicals; Sustainable engineering -- Periodicals; Environmental chemistry -- Periodicals; 333.7
• DOI: 10.1002/ep.13899
• Languages: English
• ISSNs: 1944-7442

Abstract

Abstract: Magnesium aluminum carbonate hydrotalcites (MgAl‐LDHs) were prepared by a coprecipitation method using magnesium nitrate and aluminum nitrate as raw materials, and then calcined at high temperature to obtain hydrotalcite‐like MgAl layered double oxides (MgAl‐LDOs). With ciprofloxacin hydrochloride as the target pollutant, and the adsorption kinetics of ciprofloxacin hydrochloride by MgAl‐LDOs were assessed. The results show that: MgAl‐LDHs and MgAl‐LDOs are both mesoporous adsorbent materials. After MgAl‐LDHs were calcined at 400°C, their layered structure began to collapse partially. At the same time, their specific surface area, pore volume, and average pore diameter increased from 123.593 m 2 /g, 0.666 cm 3 /g, and 21.54 nm to 185.908 m 2 /g, 1.414 cm 3 /g, and 30.42 nm, respectively. The ability of MgAl‐LDOs to remove ciprofloxacin hydrochloride in water is much greater than that of MgAl‐LDHs. The research has shown that when the concentration of ciprofloxacin hydrochloride solution is 10 mg/L, at a pH of 5, and a temperature of 25°C, the equilibrium adsorption capacity can reach 22.69 mg/g in 420 min. The results of the quasi‐first‐order kinetic model and the quasi‐second‐order kinetic model show that the parameter R 2 of MgAl‐LDOs adsorption of ciprofloxacin hydrochloride exceeds 0.94. The fitting parameters q e = 22.96 mg/g (10 mg/L) and q e = 107.02 mg/g (50 mg/L) in the quasi‐first‐order kinetic model, and the fitting parameters q e = 25.02 mg/g (10 mg/L) and q e = 112.72 mg/g (50 mg/L) in the quasi‐second‐order kinetic model are practically consistent with the measured equilibrium adsorption capacity.