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Adsorption of Sunscreen Compounds from Wastewater Using Commercial Activated Carbon: Detailed Kinetic and Thermodynamic Analyses
oleh: Stefania Gheorghe, Vasile Ion Iancu, Ioana Alexandra Ionescu, Florinela Pirvu, Iuliana Claudia Paun, Luoana Florentina Pascu, Florentina Laura Chiriac
Format: | Article |
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Diterbitkan: | MDPI AG 2023-12-01 |
Deskripsi
Sunscreen compounds are one of the most toxic substances detected in the aqueous environment. However, these molecules are continuously utilized in a various range of products to provide protection against UV radiation. The removal of three sunscreen compounds, 4-hydroxybenzophenone (<b>4-HBP</b>), 2,4-dihydroxybenzophenone (<b>BP-1</b>) and oxybenzone (<b>BP-3</b>), by commercial activated carbon (AC) was investigated using batch adsorption experiments. Different operational characteristics, such as adsorbent dosing, interaction time, solution pH and starting sunscreen compound concentration, were studied. The adsorption capacity of the AC material was assessed using a liquid chromatograph associated with a mass spectrometer detector (LC–MS/MS). Two isotherm models were utilized to explained the target compound adsorption phenomenon (Langmuir and Freundlich), while pseudo-first and -second kinetic orders and thermodynamics were utilized to examine the adsorption mechanism. The maximum adsorption capacities determined from the Langmuir isotherms were established as 43.8 mg/g for <b>4-HBP</b>, 48.8 mg/g for <b>BP-3</b> and 41.1 mg/g for <b>BP-1</b>. The thermodynamic parameters revealed the following: a negative ΔG° (<20 KJ/mol) and ΔH° and a positive ΔS° of the targeted sunscreen compounds adsorbed onto AC suggest a spontaneous and exothermic adsorption process, favored by lower temperature, proving that the physical sorption mechanism prevailed. Effective adsorption of <b>4-HBP</b>, <b>BP-3</b> and <b>BP-1</b> from real wastewater samples proved the viability of sunscreen compound removal using commercial AC material. This paper offers promising results on a sustainable, economical and environmentally friendly method for removal of ubiquitous sunscreen compounds from wastewater, as a possible enhancement of treatment processes.