Abstract
A novel cellulose acetate–tin (IV) phosphate composite material has been synthesized under varying conditions. The material was characterized by FTIR, SEM, EDX and XRD. The composite material was explored for its use in separation of toxic metal cations present in electroplating waste discharge and similar synthetic fluid by varying the system conditions [temperature (298–313 K), pH (2–12), time (10–420 min), dosage (1–10 g) and initial concentration of metal cations (1.0–15.0 mg/dm3)]. Highest removal rate was achieved for Cr3+, Ni2+ and Zn2+ (99, 98 and 94 %) under optimal conditions. Experimental equilibrium data for Cr3+, Ni2+ and Zn2+ ions fitted well with Langmuir isotherms (R 2 > 0.99). The adsorption capacities for Cr3+, Ni2+ and Zn2+ ions were found to be 31.5, 43.7 and 43.4 mg/g. Pseudo-second-order model explained the kinetics of adsorption (R 2 > 0.99) for all the metal ions undertaken in the study. Thermodynamic parameters such as ΔG, ΔS and ΔH show spontaneity and endothermic nature of the process at all the concentration ranges studied (2–15 mg/dm3). Desorption of metal ion from (CA/TPC) surface was carried out using 0.1 N nitric acid as an eluent under varying system pHs (1–6). Maximum desorption’s for all the metal ions were observed at pH 1. The adsorption efficiencies of CA/TPC for the metal ions were maintained after four consecutive cycles of adsorption/desorption process. The loss in the dry weight of CA/TPC was not more than 10 % after each cycle of process. Due to easy and high regeneration properties of CA/TPC, it was found to be economical and have shown potential benefits in recovery of metal ions from wastewater.
Highlights
Inadequate wastewater management has resulted continuous discharge of heavy metals in the aquatic system
A novel cellulose acetate–tin (IV) phosphate composite material has been synthesized under varying conditions
The results indicates that 10.0 g of CA/TPC dose was sufficient for the optimum removal of Cr3?, Ni2? and Zn2?
Summary
Inadequate wastewater management has resulted continuous discharge of heavy metals in the aquatic system. Organic–inorganic hybrid composite, cellulose acetate–tin (IV) phosphate, has been preferred to synthesize and use in heavy metal decontamination. This material has better granulometric properties, good ion exchange capacity, reproducibility and possesses good selectivity for heavy metals [21]. To our knowledge, there is little or no information about the preparation of cellulose acetate– tin (IV) phosphate composites (CA/TPC) and their use in separation and removal of heavy metals from electroplating wastewater. This study was aimed at developing a simple and efficient laboratory-scale adsorption technique to remove heavy metals such as chromium, nickel and zinc from synthetic and electroplating wastewater using cellulose acetate–tin (IV) phosphate composite (CA/TPC) material. The adsorption mechanism was evaluated from kinetics, isotherms and thermodynamics
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
