Composite of methyl polysiloxane and avocado biochar as adsorbent for removal of ciprofloxacin from waters

Teixeira, RA, Lima, EC, Benetti, AD, Thue, PS, Lima, DR, Sher, F ORCID: https://orcid.org/0000-0003-2890-5912, dos Reis, GS, Rabiee, N, Seliem, MK and Abatal, M, 2022. Composite of methyl polysiloxane and avocado biochar as adsorbent for removal of ciprofloxacin from waters. Environmental Science and Pollution Research. ISSN 0944-1344

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Abstract

Two carbon composite materials were prepared by mixing avocado biochar and methyl polysiloxane (MK). Firstly, MK was dissolved in ethanol, and then the biochar was added at different times. In sample 1 (R1), the time of adding biochar was immediately after dissolving MK in ethanol, and in sample 2 (R2), after 48 h of MK dissolved in ethanol. The samples were characterized by nitrogen adsorption/desorption measurements obtaining specific surface areas (SBET) of 115 m2 g−1 (R1) and 580 m2 g−1 (R2). The adsorbents were further characterized using scanning electron microscopy, FTIR and Raman spectroscopy, adsorption of vapors of n-heptane and water, thermal analysis, Bohem titration, pHpzc, and C H N elemental analysis. R1 and R2 adsorbents were employed as adsorbents to remove the antibiotic ciprofloxacin from the waters. The t1/2 and t0.95 based on the interpolation of Avrami fractional-order were 20.52 and 246.4 min (R1) and 14.00 and 157.6 min (R2), respectively. Maximum adsorption capacities (Qmax) based on the Liu isotherm were 10.77 (R1) and 63.80 mg g−1 (R2) for ciprofloxacin. The thermodynamic studies showed a spontaneous and exothermic process for both samples, and the value of ΔH° is compatible with physical adsorption.

Item Type:	Journal article
Publication Title:	Environmental Science and Pollution Research
Creators:	Teixeira, R.A., Lima, E.C., Benetti, A.D., Thue, P.S., Lima, D.R., Sher, F., dos Reis, G.S., Rabiee, N., Seliem, M.K. and Abatal, M.
Publisher:	Springer Science and Business Media LLC
Date:	31 May 2022
ISSN:	0944-1344
Identifiers:	Number Type 10.1007/s11356-022-21176-z DOI 1567112 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	21 Jul 2022 13:52
Last Modified:	31 May 2023 03:00
URI:	https://irep.ntu.ac.uk/id/eprint/46662

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