Ofloxacin adsorption by calcined Verde-lodo bentonite clay: Batch and fixed bed system evaluation

Antonelli, Raíssa Quaiatti; Martins, Fernanda; Malpass, Geoffroy Roger Pointer; Silva, Meuris Gurgel Carlos da; Vieira, Melissa Gurgel Adeodato

doi:10.1016/j.molliq.2020.113718

Cited by 50 publications

(35 citation statements)

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“…34 Above 800 °C, the derivative thermogravimetric (DTG) curve showed oscillations that can be attributed to the decomposition, crystallization, and fusion of some minerals present in CVL. 15,36 In addition, the pH at which the adsorbent surface charge is zero was also obtained in the literature, in which at pH > 2.7, the CVL surface has a negative surface charge. 15 This information is relevant for planning the adsorption of compounds in ionic form.…”

Section: Resultsmentioning

confidence: 84%

“…Figure 1B reveals that both the samples of fresh clay (CVL) and contaminated clay (CVL + CIP) have pores with a mean diameter much larger than those of macropore materials (>50 nm), 32 indicating that the CVL clay has a rough surface. 15 Below 50 000 nm, the pore diameter distributions of both clays are similar. Above 50 000 nm, the contaminated clay (CVL + CIP) obtained higher values of Hg intrusion, indicating that the clay roughness increased after fixed-bed adsorption.…”

Section: Resultsmentioning

confidence: 97%

“…15,34−37 According to the literature, X-ray diffractograms of CVL present peaks at 0.150 nm, common for dioctahedral montmorillonite smectite, at 0.334 nm, related to the presence of quartz, and at 0.447 nm, characteristic of montmorillonite. 15,35,37 Moreover, studies performed by Oliveira et al 36 and Antonelli et al 15,35 observed, employing thermogravimetric analysis, that CVL is thermally stable up to 1000 °C. The authors verified loss of water in the range of 76− 81 °C and loss of hydroxyls in the range of 478−483 °C.…”

Section: Resultsmentioning

confidence: 98%

“…15,36 In addition, the pH at which the adsorbent surface charge is zero was also obtained in the literature, in which at pH > 2.7, the CVL surface has a negative surface charge. 15 This information is relevant for planning the adsorption of compounds in ionic form.…”

Section: Resultsmentioning

confidence: 99%

“…Molecular modeling was performed with the antibiotic CIP and with the antibiotic ofloxacin (OFL) in which adsorption has been previously evaluated on the same clay. 15 The purpose was to obtain information on the interactions and the chemical reactivity of the two antibiotics (CIP and OFL) during adsorption on CVL bentonite clay. The three-dimensional (3D) structures of the antibiotics (CIP and OFL) were generated by the Avogadro program.…”

mentioning

confidence: 99%

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Fixed-Bed Adsorption of Ciprofloxacin onto Bentonite Clay: Characterization, Mathematical Modeling, and DFT-Based Calculations

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The objective of this paper was to examine the adsorption of the antibiotic ciprofloxacin (CIP) in a calcined Verdelodo (CVL) clay-packed fixed-bed system. The characterization study of the fresh and contaminated clay indicated filling of the clay pores by the CIP (pore volume decreased from 65.4 to 31.1 cm 3 g −1 ) and did not evidence significant changes in the clay texture. The fixed-bed system reached a breakthrough adsorption capacity of 0.038 mmol g −1 (12.6 mg g −1 ) and a mass transfer zone of 4.29 cm. Five mathematical models were fitted to the breakthrough curves, and the dual-site diffusion displayed the best fit to the experimental data (R 2 > 0.98). The adsorption performance of CIP was compared to that of the antibiotic ofloxacin, reported in the literature, in which density functional theory (DFT) computations were performed to clarify the particularities of the adsorption of both compounds onto CVL clay.

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