| dc.description.abstract | Research has been conducted on the synthesis and characterization of hydroxyapatite
of kijing shells. Kijing shells (Pilsbryoconcha exilis) are a potential natural resource
in the Belawan mangrove forest area, North Sumatra. Kijing shell waste has not been
managed optimally, so it has the potential to have a negative impact. Mussel shells
have a high calcium content which has the potential to be utilized as a calcium
precursor in the synthesis of hydroxyapatite (HAp) using the double stirring
precipitation method at variations in sintering temperatures of 800°C, 900°C, and
1000°C which aims to utilize mussel shells as Ca precursors to synthesize
hydroxyapatite. Analysis of kijing shell ash using XRF shows that the dominant
element content is the element Calcium (Ca) of 64.268% with Calcium Oxide (CaO)
compounds of 52.482% and there are still many other elements, such as Aluminum
(Al) and Silica (Si). The results of characterization using XRD show that HAp obtained
has a degree of crystallinity of 22.13%, 29.95%, and 32.95%, respectively. The highest
degree of crystallinity value at 1000°C. The average crystal size of the three samples
is 32-68 nm which meets the standards of biomedical applications. The crystal
structure of the hydroxyapatite of the three samples is hexagonal. From the results of
the FTIR test, the three samples obtained wave numbers indicating the functional
groups 0H-, CO32-, PO43- which are the dominant functional groups that make up
hydroxyapatite. Sample A1 has an average pore diameter of 1960.77 nm, A2 of 1234
nm, A3 of 925.899 nm. EDX results show the Ca/P ratio of the three samples are 1.67;
1.45; and 1.61, respectively. Sample A1 has an average pore diameter of 1960.77 nm,
A2 of 1234 nm, A3 of 925.899 nm. | en_US |
