Enhanced stability of hydroxyapatite/sodium alginate nanocomposite for effective fluoride adsorption

Physical modification of hydroxyapatite: the drastic enhancement of both cation (Cd2+) and anion (F−) adsorption and recycling efficiency

“…S1b†). 52,53 PO 4 3− exhibited three vibrational modes at 560 cm −1 , 960 cm −1 , and 1050–1100 cm −1 , which were attributed to P–O asymmetric stretching, symmetric stretching, and bending vibration, respectively. 54 In addition, C–O stretching vibration occurred at 1440 cm −1 , which may be due to the absorption of CO 3 2− from the atmosphere, replacing the PO 4 3− sites.…”

Accelerating Cd2+ adsorption using hydroxyapatite nanoparticles engineered by combination of ultrasound and microwave treatment

“…6a). The adsorbent pHpzc was calculated from the pH drift method [16,17,30], as shown in Fig. 6b, and it found to be 6.9 ± 0.1, 7 ± 0.1, and 7 ± 0.1 of HAp-M, HAp-UM, and HAp-HUM, respectively.…”

The Effect of Alginate Concentration on Crystallinity, Morphology, and Thermal Stability Properties of Hydroxyapatite/Alginate Composite

“…Meanwhile, research on composites using alginate not as a matrix but as a reinforcement has also been carried out. Sekar et al (2022) reported the preparation of HAp/SA by coprecipitation method with maximum fluoride adsorption capacity of HAp, HAp/SA1, and HAp/SA4 was 10 mg/g, 35 mg/g, and 50 mg/g, respectively [ 19 ]. Sukhodub et al (2018) presented the synthesizing HAp/Alg nanocomposites with swelling(%) and porosity values in HAp/Alg composites calcined at 1100 °C higher than pure Hap [ 20 ].…”