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G. Babu Rao ¹, G. Kalyani ¹, B. Vijaya Saradhi ², Y. Prasanna Kumar ³

Affiliations
1 Department of Chemical Engineering, GMR Institute of Technology, Rajam-532 127, A.P., IN
2 Department of Civil Engineering, A.U. College of Engineering, Visakhapatnam-530 003, A.P., IN
3 Department of Chemical Engineering, Vignan’s Engineering College, Vadlamudi-522 213, A.P., IN

Abstract

This communication presents results pertaining to the adsorptive studies carried out on fluoride removal onto an algal biosorbent (Ulva fasciata). Batch sorption studies were performed and the results revealed that biosorbent demonstrated ability to adsorb the fluoride. Influence of varying conditions for removal of fluoride such as the fluoride concentration, the dosage of adsorbent, the size of adsorbent, and the concentration of metal solution was investigated. Experimental data showed good fit with the Langmuir's adsorption isotherm model. Maximum fluoride sorption was observed at 30°C operating temperature.

Keywords

Fluoride, Biosorption, Algae, Ulva fasciata Biosorbent.

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H. Joga Rao ¹, P. King ², Y. Prasanna Kumar ³

Affiliations
1 Faculty in Chemical Engineering, GMR Institute of Technology, Rajam - 532127, Andhra Pradesh, IN
2 Department of Chemical Engineering, Andhra University College of Engineering, Visakhapatnam - 530003, Andhra Pradesh, IN
3 Visakha Institute of Engineering and Technology, Visakhapatnam - 530027, Andhra Pradesh, IN

Abstract

Objectives: A universal low cost activated carbon adsorbent (WTAC) is prepared from waste tire are used to optimize the process parameters and maximize removal of cadmium from effluents. Methods/Statistical Analysis: Applying Response Surface Methodology (RSM), optimized the process parameters and interaction effects of adsorptive parameters on adsorption efficiency by regression and ANOVA analysis. Findings: Based on the statistical approach the experimental results were analyzed and the optimum process conditions are identified as pH:7.56, Co: 3.57 mg/L, w:0.1 grams and T:315.94K. The square model (F = 614.52 and P = 0.00) and Linear (F = 1682.39 and P = 0.018) model terms highly significant effect than interactive (F = 24.39 and P = 0.27) model terms. Based on high ‘t’- and low ‘P’ value (< 0.05), both the linear terms and the squared terms, i.e., pH (x1), Co(x2), w (x3) and T (x4), show significant effect; while in front of interaction effects, x2x4 are found to be significant effect and other interactions are to be insignificant on the percentage of Cd removal. Equilibrium data were well interpreted by Langmuir model, and the maximum amount of Cd deposited on the WTAC adsorbent surface is 2.59 mg/g at 313 K. The adsorption efficiency of CD onto WTAC adsorbent increases with increasing temperature of the solution. The variation of thermodynamic energy parameters (ΔGo, ΔHo and ΔSo) with effluent temperature described that the adsorption process is endothermic, spontaneous at high temperatures and non-spontaneous at low temperatures. These condorder kinetics are feasible for a Cd adsorption process using WTAC adsorbent. Application/Improvements: WTAC, when utilized under the process conditions, may be a viable and effective treatment for Cd removal from industrial effluents.

Keywords

Adsorption Isotherms, Cadmium, Central Composite Design (CCD), Kinetics, Thermodynamic Studies, WTAC.

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