Biosorption Of Anionic Dyes Research Articles

Biosorption of anionic dye using nanocomposite derived from chitosan and silver Nanoparticles synthesized via cellulosic banana peel bio-waste

In this study, a nanocomposite bio-adsorbent derived from biopolymer chitosan (CS as a matrix) and silver nanoparticles (AgNPs), synthesized via cellulosic banana peel bio-waste (BPC), was developed for further enhancing the bio-sorption of Reactive Orange 5 (RO5) dyes. The optimum RO5 dye removal percent was determined using the Taguchi design. FTIR-ATR, XRD, SEM, BET, and TEM were used to characterize the bio-sorbent AgNPs/BPC/CS nanocomposite. Size distribution, zeta potential analysis, thermogravimetric, reuse efficiency, and swelling behavior were also investigated. TEM and size distribution results confirmed that AgNPs composites biosynthesis generated in nanoparticle size, varying from 25 to 100 nm, with a peak position of size distributions at 47 and 43 nm for AgNPs/BPC, AgNPs/BPC/CS nanocomposites, respectively. The ANOVA analysis indicated that the RO5 removal models are considered a goodness-of-fit and can explain more than 99% of the response variable. The reuse efficiency studies have also demonstrated that the AgNPs/BPC/CS bio-sorbent could be reused up to four times with appreciable dye removal efficiency of more than 95 percent. The improved removal process of the anionic dyes is attributed to the enhanced surface positive groups of the developed AgNPs/BPC/CS bio-sorbent. • AgNPs/BPC/CS biosorbent was successfully created via cellulosic banana peel waste. • Adsorption performance of AgNPs/BPC was enhanced by chitosan. • The optimums of RO5 removal were assessed using the Taguchi design. • AgNPs/BPC/CS was found to be reusable over four cycles.

Biosorption of anionic dyes from aqueous solutions using a novel magnetic nanocomposite adsorbent based on rice husk ash

ABSTRACTThis study investigated the potential use of an agricultural waste, rice husk ash, for the removal of methyl orange. The adsorbent was prepared via a simple one-pot synthesis of magnetic iron oxide nanoparticles (MIONs). The prepared magnetic nanocomposites were characterized using Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and vibrating sample magnetometer techniques. Bach adsorption experiments were carried out to evaluate the effects of initial dye concentration, pH and contact time as well as MION content on adsorption capacity. The mechanism of dye adsorption was well fitted to a pseudo-second-order kinetic model. Moreover, the equilibrium data fitted well with the Langmuir isotherm model.

Kinetic, isotherm and thermodynamic studies of amaranth dye biosorption from aqueous solution onto water hyacinth leaves

The present study explored the kinetics, equilibrium and thermodynamics of amaranth (acid red 27) anionic dye (AD) biosorption to water hyacinth leaves (LEC). The effect of LEC particle size, contact time, solution pH, initial AD concentration and temperature on AD biosorption was studied in batch experiments. AD biosorption increased with rising contact time and initial AD concentration, and with decreasing LEC particle size and solution pH. Pseudo-second-order chemical reaction kinetics provided the best correlation for the experimental data. Isotherm studies showed that the biosorption of AD onto LEC closely follows the Langmuir isotherm, with a maximum biosorption capacity of about 70 mg g−1. The thermodynamic parameters confirm that AD biosorption by LEC is non-spontaneous and endothermic in nature. Results indicate that LEC is a strong biosorbent capable of effective detoxification of AD-laden wastewaters.