Facile Fabrication of Bimetallic Cross-Linked Dual Clay/Biopolymeric Hybrid Composite for Selective Phosphate Removal from Water.

The excess phosphate in water leads to eutrophication. To reduce eutrophication, alginate-pectin supported bentonite-hydrotalcite cross-linked with zirconium-cerium bimetal ions based biopolymeric composite namely APBHZC bimetallic composite was synthesized for phosphate removal from water. SEM, EDAX and FTIR techniques were used to classify the physico-chemical properties of APBHZC bimetallic composite. Adsorption studies like pH, co-ions, temperature and contact time were carried out under batch method. The developed APBHZC bimetallic composite achieved a maximum phosphate adsorption capacity of 42.50 mg/g within 40 min. The pH of the solution interferes with phosphate adsorption using APBHZC bimetallic composite. Among the co-ions, sulphate ions affected the phosphate adsorption onto APBHZC bimetallic composite. Isotherm studies were described that the phosphate adsorption onto APBHZC bimetallic composite was multilayer adsorption process and it was followed by Freundlich isotherm model. Kinetic studies illustrated that the intraparticle diffusion and pseudo-second-order were more suitable models for phosphate adsorption onto APBHZC bimetallic composite. Thermodynamics studies revealed that the phosphate adsorption on bimetallic composite was spontaneous and endothermic in nature. The developed APBHZC bimetallic composite can be reused upto 4 cycles. In addition, the appropriateness of APBHZC bimetallic composite at field conditions was also checked. [ABSTRACT FROM AUTHOR]