A comparative study of microwave and chemically treated Acacia nilotica leaf as an eco friendly adsorbent for the removal of rhodamine B dye from aqueous solution

Abstract

The use of cheap and eco friendly adsorbents prepared from freely and abundantly available Acacia nilotica leaves have been investigated by batch methods. Microwave treated A. nilotica leaves (MVM) are more effective than chemically treated A. nilotica leaves (CVM) for the removal of rhodamine B (RH B) from aqueous solution. The effect of initial pH, contact time and initial dye concentration of RH B onto CVM and MVM has been investigated. The applicability of the linear form of Langmuir model to CVM and MVM was proved by the high correlation coefficients R 2 = 0.9413 and 0.9681 for RH B adsorption. The R 2 values were greater than 0.994 for all RH B concentrations, which indicates the applicability of the pseudo-second-order kinetic model. The recycling ability of MVM is greater than CVM. The preparation of MVM does not require an additional chemical treatment step and it attains rapid equilibrium. Hence it is agreeing with the principles of green chemistry and less time is required to possess high adsorption of RH B. Therefore, the eco friendly adsorbent MVM is expected to be environmentally and economically feasible for the removal of RH B from aqueous solutions.

Scavenging Rhodamine B dye usingmoringa oleiferaseed pod

“…The adsorption is physical if E ranges from 1 to 8 kJ/mol. If the value of E ranged between 9 and 16 kJ/mol, it is chemical adsorption [36].…”

“…The values of E a for MOSPAC at 30, 40, and 50 °C are 0.707, 2.236, and 0.236 kJ/mol respectively. Since all these values range between 1 and 8 kJ/mol, it shows that physisorption was responsible for the adsorption of Rh-B dye onto MOSPAC [35,36]. After summarizing all the important parameters for each isotherm, the value of R 2 was used to judge the most suitable model for the adsorption of Rh-B dye onto MOSPAC.…”

Enhanced photocatalytic activity of metal oxides/β-cyclodextrin nanocomposites for decoloration of Rhodamine B dye under solar light irradiation

“…The reason is under alkaline conditions, the concentrations of perhydroxyl radicals and hydroxide ions are getting increased. During catalyst-based photochemical reactions, both perhydroxyl as well as hydroxyl ions produce large number of hydroxyl radicals in the aqueous medium, which effectively take part in the decoloration of organic pollutants present in RhB dye (Wang et al 2009a, b;Kansal et al 2008;Santhi et al 2011).…”

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

“…Particularly, the synthetic xanthene dye, Rhodamine B (RhB) (which is carcinogenic), is widely used for paper printing, textile, leather dyeing, photographic and paint industries (Guo et al, 2011;Santhi et al, 2014). To avoid the negative impacts of dye-containing effluents, they can be carefully treated before discharge (Dotto et al, 2015b).…”

“…Specifically for RhB, tannic acid functionalised graphene (Liu et al, 2015), Duolite resin (Al-Rashed and Al-Gaid, 2012), cobalt nanoparticles-embedded magnetic ordered mesoporous carbon (Tang et al, 2014), activated carbons from lignocellulosic wastes (Lacerda et al, 2015), Iraqi bentonite clay (Al-Saadi et al, 2007), raw flint clay (Kareem and Al-Hussien, 2012), microwave and chemically treated Acacia nilotica leaf (Santhi et al, 2014), acid activated mango leaf (Khan et al, 2011), treated rice husk-based activated carbon (Ding et al, 2014), iron-pillared bentonite , kaolinite (Bhattacharyya et al, 2014), iron-modified rectorite (Zhao et al, 2012) and exhausted coffee ground (Shen and Gondal, 2013) were tested. In this context, the use of inexpensive and readily available adsorbents becomes the adsorption process an attractive and promising technology.…”