Optimization of process variables and mechanism of arsenic (V) adsorption onto cellulose nanocomposite

Overview

Cerium modified cellulose bead, CCNB, a novel biobased adsorbent is successfully employed for adsorptive removal and recovery of As(V) from synthetic and field samples of arsenic affected areas. CCNB was characterized for its surface and bulk properties. The process was optimized for the multivariables, mutually interactive and cooperative, influencing the adsorption of As(V) on CCNB. Fractional factorial design was used primarily to categorize the variables in terms of their significances. Central composite design was applied to build the polynomial correlating variables and the response. The data quality as well as the model validity was scrutinized from ANOVA. The kinetics of adsorbent-solute interaction was followed and the most suitable rate equation (first order) was established. The contribution of surface and pore diffusion as well as the mechanism of As(V)-CCNB interaction was illustrated. The elution of arsenic (V) and reuse of CCNB through adsorption-elution was described. The adsorbent can be recycled at least for four successive operations. The adsorbent is found to be highly efficient for arsenic removal fromsome spiked groundwater samples of West Bengal.

Summary

Several kinds of adsorbents are reported among which bio-derived materials are preferred due to their biodegradable character. In continuation to our earlier report on feasibility of arsenic (V) adsorption on cerium loaded cellulose nanocomposite bead (CCNB), the present study deals with multivariable optimization and mechanism of arsenic (V) adsorption. Multivariable optimization through experimental design for As(V) adsorption is rarely reported in the literature. The validation of the experimental design for adsorptive recovery of aqueous As(V), applicability in real samples, recycling of CCNB and finally mechanistic pathway of As(V)-CCNB interaction are demonstrated in the present communication.

Author Comments

Dr. Dhiman Santra, Ph.D.
Dr. Dhiman Santra, Ph.D.
University of Calcutta
Department of Chemistry
Analytical Chemistry
Kolkata, West Bengal | India
Removal of arsenic from water becomes necessary to protect the quality of water and human health.Dr. Dhiman Santra, Ph.D.

Resources

ScienceDirect
http://dx.doi.org/10.1016/j.molliq.2016.09.104

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