The preparation of calcium phosphate adsorbent from natural calcium resource and its application for copper ion removal
- PDF / 1,166,824 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 71 Downloads / 182 Views
RESEARCH ARTICLE
The preparation of calcium phosphate adsorbent from natural calcium resource and its application for copper ion removal Marta Kalbarczyk 1 & Aleksandra Szcześ 1
&
Dariusz Sternik 2
Received: 25 May 2020 / Accepted: 20 August 2020 # The Author(s) 2020
Abstract Using the hen eggshells (biowaste) as a source of calcium and an environmentally friendly approach, the nanopowder composed of 74% of hydroxyapatite (HA) and 26% of β–tricalcium phosphate (β-TCP) was obtained. Due to the maximum reduction of the stages associated with the use of chemicals and energy, this method can be considered as economically and environmentally friendly. A well-developed surface area and the negative zeta potential at pH above 3.5 indicate good adsorption properties of this material. The obtained material shows high adsorption capacity towards Cu2+ ions, i.e. 105.4 mg/g at pH 5. Good fit of the Langmuir adsorption model and the pseudo-second-order kinetic model may indicate chemical adsorption probably due to the electrostatic interactions between the Cu2+ cations and the negatively charged phosphate and hydroxyl groups on the material surface. Keywords Calcium phosphate . Eggshells . Wastewater . Copper ion adsorption
Introduction Materials based on calcium phosphates (CP) are commonly known because of their bone reconstruction possibilities, mostly in the field of dentistry, orthopaedic and trauma surgery (Jeong et al. 2019). The main difference between the mineral compositions is the Ca/P molar ratio, which can be in the range from 0.5 to 2.0 (Sakka et al. 2013). Physicochemical properties are strongly related to the Ca/P ratio in the mineral structure; hence, the capabilities of these materials are significantly different. Applications of calcium phosphates are largely dependent on their properties. They can be used as phosphorous fertilizers or food supplements as well as the main component of cements used in dentistry according to their pH stability and solubility in water. Adaptation as bone Responsible editor: Tito Roberto Cadaval Jr * Aleksandra Szcześ [email protected] 1
Department of Interfacial Phenomena, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, Sq. M. Curie-Skłodowska 3, 20-031 Lublin, Poland
2
Department of Physical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, Sq. M. Curie-Skłodowska 3, 20-031 Lublin, Poland
implant materials in orthopaedic and trauma surgery is the most interesting and promising (Dorozhkin and Epple 2002; Akram et al. 2014). The natural material, hydroxyapatite (HA), is the subject of numerous studies, among others, due to its sorption properties. This compound with chemical formula Ca10(PO4)6(OH)2 is the least soluble in water in the calcium phosphate group (pKs equal to 116.8 at 25 °C) and resistant to pH changes (Akram et al. 2014). Hydroxyapatite occurs naturally in the crystalline form and, as the major constituent of vertebrate teeth and bones
Data Loading...
