Soil Chemical Analysis

http://libir.tmu.edu.tw/bitstream/987654321/43034/1/4.pdf

Review of second-order models for adsorption systems.

Adsorption of dyes and heavy metal ions by chitosan composites: A review

Equilibrium and kinetic studies in adsorption of heavy metals using biosorbent: a summary of recent studies.

Application of chitosan and its derivatives as adsorbents for dye removal from water and wastewater: a review.

Adsorption behaviour of Fe(II) and Fe(III) ions in aqueous solution on chitosan and cross-linked chitosan beads.

Equilibrium and kinetics studies of adsorption of copper (II) on chitosan and chitosan/PVA beads.

The efficacy of coconut tree sawdust (CTS),
eggshell (ES) and sugarcane bagasse (SB) as alternative low-cost biosorbents
for the removal of Cu(II), Pb(II) and Zn(II) ions from aqueous solutions was investigated. Batch adsorption studies were carried out
to evaluate the effects of solution pH and initial metal concentration on
adsorption capacity. The optimum biosorption condition was found at pH 6.0, 0.1
g biomass dosage and at 90 min equilibrium time. The adsorption data
were fitted to the Freundlich and Langmuir isotherm models. The adsorption
capacity and affinity of CTS, ES and SB were evaluated. The Freundlich constant
(n) and separation factor (RL) values suggest that the
metal ions were favourably adsorbed onto biosorbents. The maximum adsorption capacities (Q) estimated from the Langmuir isotherm
model for Cu(II), Pb(II) and
Zn(II) were 3.89, 25.00 and 23.81 mg/g for CTS, 34.48, 90.90 and 35.71 mg/g for
ES, and 3.65, 21.28 and 40.00 mg/g for SB, respectively. The characterisation studies were performed using Scanning Electron Microscope (SEM), Energy
Dispersive X-ray Spectrometer (EDX) and Fourier Transform Infrared Spectrometer
(FTIR). Interaction with metal ions led to the formation of discrete aggregates
on the biosorbents surface. The metal ions bound to the active sites of the
biosorbents through either electrostatic attraction or complexation mechanism.

/pdf/biosorption-of-cu-ii-pb-ii-and-zn-ii-ions-from-aqueous-2bprjdk9dw.pdf

Biosorption of Cu(II), Pb(II) and Zn(II) Ions from Aqueous Solutions Using Selected Waste Materials: Adsorption and Characterisation Studies

A basic investigation on the removal of Cr(III) and Cr(VI) ions from aqueous solution by chitosan beads was conducted in a batch adsorption system. The chitosan beads were prepared by casting an acidic chitosan solution into an alkaline solution. The influence of different experimental parameters; pH, agitation period and different concentration of Cr(III) and Cr(VI) ions was evaluated. A pH 5.0 was found to be an optimum pH for Cr(III) adsorption, and meanwhile pH 3.0 was the optimum pH for the adsorption of Cr(VI) onto chitosan beads. The Langmuir and Freundlich adsorption isotherm models were applied to describe the isotherms and isotherm constants for the adsorption of Cr(III) and Cr(VI) onto chitosan beads. Results indicated that Cr(III) and Cr(VI) uptake could be described by the Langmuir adsorption model. The maximum adsorption capacities of Cr(III) and Cr(VI) ions onto chitosan beads were 30.03 and 76.92 mg g−1, respectively. Results showed that chitosan beads are favourable adsorbents. The Cr(III) and Cr(VI) ions can be removed from the chitosan beads by treatment with an aqueous EDTA solution.

Azlan Kamari

Papers

Adsorption behaviour of Fe(II) and Fe(III) ions in aqueous solution on chitosan and cross-linked chitosan beads.

Equilibrium and kinetics studies of adsorption of copper (II) on chitosan and chitosan/PVA beads.

Biosorption of Cu(II), Pb(II) and Zn(II) Ions from Aqueous Solutions Using Selected Waste Materials: Adsorption and Characterisation Studies

Adsorption of chromium from aqueous solution using chitosan beads

Sorption of acid dyes onto GLA and H2SO4 cross-linked chitosan beads