Peach Pit Chemically Treated Biomass as a Biosorbent for Metformin Hydrochloride Removal: Modeling and Sorption Mechanisms

Abstract

In this work, the potential of peach pit biosorption in the removal of the drug metformin hydrochloride from water is evaluated. Experiments are carried out in a closed batch system to evaluate the effect of the solution pH (2-10), temperature (25, 35 and 45 °C), stirring (100, 150 and 200 rpm) and chemical treatments. During the study, biosorbent characterization, kinetic tests, equilibrium tests and thermodynamic parameter calculations are performed. The operating conditions that show the best results for both the raw biosorbent and the biosorbent submitted to acid, basic and acid followed by basic treatments with removal capacities of 3.17, 10.83, 18.10 and 49.14 mg g -1 , respectively, are pH 7, 25 °C and 100 rpm, which result in an equilibrium time of 12 h. In the kinetic study, the pseudo-second-order model represents the best fit for the experimental data, while the Langmuir model best represents the equilibrium data. The biomasses submitted to chemical treatments show a significant increase in drug removal capacity related to the raw biosorbent, with the best maximum absorption of 82.54±1.34 mg g -1 achieved after the application of the acid followed by basic treatment. These results show that peach pit has potential to be used as a low-cost biosorbent to remove drugs from water.

Peach Pit-Activated Carbons: Effect of Row Material Form and Pyrolysis Parameters on Hydrogen Adsorption Storage

“…To obtain information on the surface structural properties and chemical/atomic composition of the synthesized samples subjected to different carbonization and activation processes, scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis were carried out by Quanta FEG 400 (FEI) while X-ray diffraction (XRD) analysis was carried out with a Rigaku Miniflex 600 equipped by a Cu tube (40 kV, 30 mA). Fourier-transform infrared spectroscopy (FTIR) was performed on the raw material and on the synthesized ACs in the range from 3780 to 850 cm –1 . All measurements were carried out using a Thermo Fisher Scientific Nicolet iS50 Fourier-transform IR spectrometer equipped with a DTGS (Deuter Triglyceride Sulfate) detector.…”

“…Fourier-transform infrared spectroscopy (FTIR) was performed on the raw material and on the synthesized ACs in the range from 3780 to 850 cm −1 . 43 All measurements were carried out using a Thermo Fisher Scientific Nicolet iS50 Fourier-transform IR spectrometer equipped with a DTGS (Deuter Triglyceride Sulfate) detector. All of the AC samples (0.5 ± 0.1 mg) were made into KBr (100 ± 1 mg) pellets, and prior to the analysis, the samples were treated at 373 K for 1 h to remove the adsorbed water.…”

Remediation of emerging pollutants using biochar derived from aquatic biomass for sustainable waste and pollution management: a review

“…Modified BC exhibits enhanced levels of several functional groups, including alcohol/phenol‐OH, COOH, and CHO, that help in the removal of organic contaminants including harmful metals and other chemical compounds. Biochar, modified with metal oxides and metal salts exhibits strong precipitation, electrostatic attraction ability and anion exchange capacity, which enhances its ability to adsorb ECs 16 . Phosphoric acid (H 3 PO 4 ), sodium hydroxide (NaOH), zinc chloride (ZnCl 2 ), ferric oxide (Fe 3 O 4 ), hydrogen peroxide (H 2 O 2 ) and steam activation have been primarily explored, with H 3 PO 4 showing the most promising results towards adsorption of EC, especially antibiotics.…”

“…Biochar, modified with metal oxides and metal salts exhibits strong precipitation, electrostatic attraction ability and anion exchange capacity, which enhances its ability to adsorb ECs. 16 Phosphoric acid (H 3 PO 4 ), sodium hydroxide (NaOH), zinc chloride (ZnCl 2 ), ferric oxide (Fe 3 O 4 ), hydrogen peroxide (H 2 O 2 ) and steam activation have been primarily explored, with H 3 PO 4 showing the most promising results towards adsorption of EC, especially antibiotics. Biochar activated with H 3 PO 4 was found to give an adsorption capacity of 365.4 mg g −1 against tetracycline.…”