A Novel Biosorbent, Water-Hyacinth, Uptaking Methylene Blue from Aqueous Solution: Kinetics and Equilibrium Studies

Abstract

The adsorption of MB dye from aqueous solution onto HCl acid treated water-hyacinth (H-WH) was investigated by carried out batch sorption experiments. The effect of process parameters such as pH, adsorbent dosage, concentrations and contact time, and ionic strength were studied. Adsorption of MB onto H-WH was found highly pH dependent and ionic strength shows negative impact on MB removal. To predict the biosorption isotherms and to determine the characteristic parameters for process design, Langmuir, Freundlich, Temkin, and Halsey isotherms models were utilized to equilibrium data. The adsorption kinetics was tested for pseudo-first-order (PFO), pseudo-second-order (PSO), intraparticle diffusion (IPD), and Bangham’s kinetic models. The Langmuir isotherm model showed the goodness-of-fit among the tested models for equilibrium adsorption of MB over H-WH and indicated the maximum adsorption capacity as 63.30 mg/g. Higher coefficient of determination (R2>0.99) and better agreement between the qe (experimental) andqe(calculated) values predicted that PSO kinetic model showed the goodness-of-fit for kinetic data along with rate constant1.66×10-3,4.42×10-3, and3.57×10-3 mg·g-1min⁡-1/2⁡, respectively, for the studied concentration range. At the initial stage of adsorption, the overall rate of dye uptake was found to be dominated by external mass transfer, and afterwards, it is controlled by IPD mechanism.

Use of Agricultural Residues to Remove Iron from Groundwater in Modified Airlift Aerator

“…The results were similar to the study of Mohan et al (2006) which used RH and WH to adsorb arsenic and found a high efficiency between 71-96%. More than 50% of removal efficiency was noted for WH, RH, and CS, similar to other related studies (Hoyos-Sánchez et al, 2017;Uddin et al, 2014;Zhao et al, 2018). Contrasting with other studies, only RS has a lower efficiency.…”

“…Then WH was pretreated by 0.1 M HCl solution for 20 min to remove lignin and other soluble compounds. Then the WH was washed with distilled water and dried at a temperature of 100 o C for 8 h. Dried WH was powdered and sieved using a 60-mesh screen to set a particle size of 2.5×10 -3 m (Mohanty et al, 2006;Uddin et al, 2014). The pH value was controlled at around 5 to 6 using a NaOH solution.…”

Sequestration of Hexavalent Chromium from Aqueous Medium Using Biochar Prepared from Water Hyacinth Biomass

“…The adsorbent surface modifies its polarization according to the solution pH [15]. At pH > pH ZPC , the surface of the adsorbent become negatively charged due to the sorption of OH by electrostatic attractive force whereas when pH < pH ZPC , adsorbent surface attains positive charge due to the adsorption of H + [16]. Hence, the adsorption of anionic metals (Cr(VI)) will be favoured at pH < pH ZPC [17].…”

Removal of Synthetic Dyes by Dried Biomass of Freshwater Moss Vesicularia Dubyana: A Batch Biosorption Study

“…Coefficients of determination (R 2 ) related to the Langmuir model applied to TT and MB biosorption data (R 2 = 0.965 for TT; R 2 = 0.990 for MB) were higher than those for the Freundlich model (R 2 = 0.955 for TT; R 2 = 0.938 for MB). In addition, the biosorption of methylene blue and thioflavin T by agricultural by-products from the hop (Humulus lupulus L.) [27] and methylene blue by water hyacinth biomass [31], agro-waste oil tea shell [13], Anethum graveolens biomass [32] and Tremella fuciformis biomass [33] was very well fitted by Langmuir model. Table 2.…”