Response surface optimization of Rhodamine B dye removal using paper industry waste as adsorbent

Anita Thakur,Harpreet Kaur

doi:10.1007/s40090-017-0113-4

Anita Thakur, Harpreet Kaur

Open Access

https://doi.org/10.1007/s40090-017-0113-4

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Abstract

The present investigation describes the conversion of waste product into effective adsorbent and its application for the treatment of wastewater, i.e., chemically modified solid waste from paper industry has been tested for its adsorption ability for the successful removal of Rhodamine B dye from its aqueous solution. The adsorption isotherm, kinetics and thermodynamic parameters of process have been determined by monitoring the different parameters, such as effect of pH, amount of adsorbent dose, concentration, contact time and temperature. The equilibrium data has been well described on the basis of various adsorption isotherms, namely Langmuir, Freundlich and Temkin adsorption isotherm. From Langmuir isotherm, the maximum monolayer adsorption capacity has been found to be 6.711 mg g−1 at 308 K temperature. The kinetics of adsorption has been studied using pseudo-first order, pseudo-second order and intra-particle diffusion model and the results show that kinetics has been well described by pseudo-second order. Thermodynamic parameters, such as free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS), have been evaluated. The free energy has been obtained as −11.9452 kJ mol−1 for 75 mg L−1 concentration at 308 K temperature. Desorption and recycling efficiency of adsorbent has been studied and the adsorbent shows good recycling efficiency.

Highlights

The kinetics of adsorption has been studied using pseudo-first order, pseudo-second order and intra-particle diffusion model and the results show that kinetics has been well described by pseudo-second order
This is due to the reason that at initial stages, all the active sites are free for adsorption, but after 60 min equilibrium is established between dye in solution and dye on adsorbent, i.e., there is electrostatic hindrance or repulsion between the adsorbed dye onto the adsorbent surface [6, 31]
This study investigated the adsorption of a basic dye Rhodamine B onto CMSW as a function of adsorbent dose, initial dye concentration, pH and temperature

Summary

Introduction

India ranks third among the leading textile-producing countries in the world behind China and European nations, and more than 95 million peoples got engaged in textile and related sectors in India [1]. Int J Ind Chem (2017) 8:175–186 significance, the textile industries are the main source of pollution due to discharge of hazardous effluent containing colours and organic chemicals used for bleaching, dyeing, printing and other finishing processes [2]. About 10–15% of total dyestuff (equivalent to 280,000 tonnes) is released annually into the environment during the manufacturing of textile products, which leads to the contamination of water reservoirs, and thereby affects human and animal health [3, 4]. Rhodamine B is synthetically prepared xanthene cationic dye and widely used for paper printing and as a colourant in textile and food stuff [5]. The wastewater contaminated with Rhodamine B dye must be treated carefully before discharged into water streams [9]

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