Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
Chemosphere. 2022 Jan;286(Pt 1):131659. doi: 10.1016/j.chemosphere.2021.131659. Epub 2021 Jul 27.
Current study presents a facile synthesis method for thiol functionalised silica microsphere loaded polymeric hydrogel. Silica microspheres were synthesised as core shell particles by sol-gel method followed by hydrolysis and condensation reaction to form the silica core. The silica was functionalised with thiol and the functionalised silica microsphere was subsequently impregnated into polymeric alginate matrix to form thiol functionalised silica microspheres loaded alginate hydrogel beads (SH-SiOMS-Ca-Alg). The developed components and final products were characterised by BET, FTIR, DLS, SEM-EDS. The developed SH-SiOMS-Ca-Alg hydrogel beads were used for efficient removal of Pb and Cd [72-97 % for Pb; 60-85 % for Cd at concentration range of 0.1-100 μg mL and optimum pH 5-7] from aquatic medium. The sorption capacities evaluated for Pb and Cd from Langmuir isotherm were 127.99 and 70.68 mgg respectively. Uptake kinetics, isotherm, thermodynamics, intraparticle diffusion studies were carried out for both Pb (II) and Cd (II). Mechanism of Pb (II) and Cd (II) removal by SH-SiOMS-Ca-Alg hydrogel hybrid beads was proposed with the help of zeta potentials of SH-SiOMS at different pH along with fraction diagram of Pb and Cd.
当前的研究提出了一种简便的合成方法，用于制备巯基功能化的硅胶微球负载的聚合物水凝胶。通过溶胶-凝胶法合成核壳颗粒，然后进行水解和缩合反应，形成硅胶核。硅胶被巯基功能化，然后将功能化的硅胶微球浸渍到聚合物海藻酸钠基质中，形成巯基功能化的硅胶微球负载的海藻酸钠水凝胶珠（SH-SiOMS-Ca-Alg）。通过 BET、FTIR、DLS、SEM-EDS 对所开发的组分和最终产物进行了表征。开发的 SH-SiOMS-Ca-Alg 水凝胶珠用于从水介质中有效去除 Pb 和 Cd[0.1-100μg mL 浓度范围内，Pb 的去除率为 72-97%，Cd 的去除率为 60-85%；最佳 pH 值为 5-7]。从 Langmuir 等温线评估的 Pb 和 Cd 的吸附容量分别为 127.99 和 70.68 mgg。对 Pb（II）和 Cd（II）的吸附动力学、等温线、热力学和内扩散研究进行了研究。通过在不同 pH 值下 SH-SiOMS 的 ζ 电位以及 Pb 和 Cd 的分馏图，提出了 SH-SiOMS-Ca-Alg 水凝胶杂化珠去除 Pb（II）和 Cd（II）的机制。
