Adsorption and desorption kinetics of toxic organic and inorganic ions using an indigenous biomass: Terminalia ivorensis seed waste

Abstract

Environmental remediation has been a strategy employed by scientists to combat water pollution problems that have led to the scarcity of potable water. Hence, in this study, Terminalia ivorensis seed waste (TISW) was explored for the removal of Congo Red, Methylene Blue, Cadmium and Lead from aqueous solutions. Some experimental variables such as pH, biosorbent dose, initial solute ion concentration, agitation time and temperature were optimised. The surface microstructures of TISW were studied using proximate analysis, bulk density, specific surface area, pH of Point of Zero Charge, Fourier Transform Infra Red Spectroscopy, Thermogravimetric/Differential Thermal Analysis, Scanning Electron Microscopy and Energy Dispersive Analysis of X-ray. The maximum Langmuir monolayer saturation adsorption capacity, q max L , was obtained as 175.44 mg/g for the removal of Methylene Blue by TISW. Also, the q max L for CR, Cd(II) ion and Pb(II) ion were 85.47, 12.58 and 52.97 mg/g, respectively. Also, the pseudo-first-order constant, k 1 , and pseudo-second-order rate constant, k 2 , are 0.008-0.026 min -1 and 0.012-0.417 mg g -1 min -1 , respectively. Hence, TISW is recommended as a good adsorbent for the removal of both toxic industrial dyes and toxic metal ions from polluted water.

Adsorption mechanism modeling using lead (Pb) sorption data on modified rice bran-insoluble fiber as universal approach to assess other metals toxicity

“…[1,2] Cellulose and lignin could bind with heavy metals, which are dependent on their source of origin and relevant fraction of various constituents. [3][4][5] Similarly, a group of researchers reported that hemicellulose and pectin also could bind heavy metals (Pb, Cu, and Cd) that can improve health via fiber-containing food. [6] Various researchers investigated dietary fiber in terms of its potential to scavenge heavy metals after it enters the body [7][8][9] and to elucidate the dietic factors that could affect the heavy metal-binding capacity, some endogenous factors like proteins and exogenous factors like pH.…”

Exploring the Potential of Amino-Functionalized Zeolite Series/H3PO4-Biochar for Environmental Microplastic Removal

“…First is the diffusion of adsorbate (PSMMs) through the solution to the external surface of the adsorbent (AFZ) or the boundary layer diffusion of the adsorbate or solute molecules (surface or boundary layer diffusion); second is the gradual adsorption, in which intraparticle diffusion may be a rate-limiting step (intraparticle diffusion); third is the diffusion of adsorbate particles to adsorption sites either by pore diffusion through the liquid-filled pores or by a solid diffusion mechanism (pore diffusion or solid diffusion). Some of the adsorbates are adsorbed onto the adsorbent by a combination of one, two, or three diffusion mechanisms. ,− Also, the activation and pyrolysis of biomasses have been understood to cause the formation of irregular carbon layers that comprised abundant small-sized pores, which played a vital role in the adsorption of target contaminants. ,, Noteworthy of mention is that numerous published papers focused and dwelt on adsorbents with a large surface area and pore size as the only platform in which more functional moieties (active sites) and pore channels could be made available for enhanced adsorption processes. Generally, it is understood that the small surface area and pore size of adsorbents prevent target contaminant molecules from accessing more active sites and pore channels during adsorption processes.…”

Kinetic and equilibrium studies of adsorption of Pb(II) on low cost agri-waste adsorbent Jute Stick Powder

“…Drop wise 0.1 M NaOH or 0.1 M HCl was added until the desired value was obtained. The effect of parameters was determined by using a range such as pH (2)(3)(4)(5)(6)(7)(8), adsorbent dose (0.25-1.00 g), initial Pb(II) ion concentration (20-100 mg/L), contact time (0-120 min) and shaking speed 180 rpm at a room temperature of 28 °C. To optimize the conditions one parameter was kept different while other parameters were kept constant.…”

“…( ) 1 e t e k log q -q = log q -t 2.303 (7) where, qe (mg/g) and qt (mg/g) are adsorption amount at equilibrium and reaction time t (min), respectively. k1 (min 1 ) is the rate constant in the pseudo-first-order adsorption process.…”

“…Biosorption process is a new technology by which using living or non-living biomaterial heavy metals are adsorbed from the aqueous solution. There are some agricultural byproducts such as sugarcane biomass, rice husks, coconut husk, orange peel, banana peel, neem leaf etc, [5][6][7] which can be defined as efficient biosorbent because, they are cost effective, easily available, environment friendly, degradable and came from renewable sources [8]. In the present study, jute stick powder (JSP) is used as an adsorbent to remove Pb(II) from aqueous solution.…”