Application of anaerobic granular sludge for competitive biosorption of methylene blue and Pb(II): Fluorescence and response surface methodology

Abstract

This study assessed the biosorption of anaerobic granular sludge (AGS) and its capacity as a biosorbent to remove Pb(II) and methylene blue (MB) from multi-components aqueous solution. It emerged that the biosorption data fitted well to the pseudo-second-order and Langmuir adsorption isotherm models in both single and binary systems. In competitive biosorption systems, Pb(II) and MB will suppress each other's biosorption capacity. Spectroscopic analysis, including Fourier transform infrared spectroscopy (FTIR) and fluorescence spectroscopy were integrated to explain this interaction. Hydroxyl and amine groups in AGS were the key functional groups for sorption. Three-dimensional excitation-emission matrix (3D-EEM) implied that two main protein-like substances were identified and quenched when Pb(II) or MB were present. Response surface methodology (RSM) confirmed that the removal efficiency of Pb(II) and MB reached its peak when the concentration ratios of Pb(II) and MB achieved a constant value of 1.

Pb2+ biosorption from aqueous solutions by live and dead biosorbents of the hydrocarbon-degrading strain Rhodococcus sp. HX-2

“…In our study, after five recycling experiments, the recycling efficiency was 70% and 61.9% for dead and live biosorbents, respectively, indicating that the biosorbents could be well regenerated and reused. Pertaining to the effect of coexisting ions on Pb 2+ biosorption, there are three possible interactive effects of a mixture of metal ions, namely synergism [66], antagonism [67], and non-interaction [68]. The reason for the removal of a metal ion in the presence of other metal or inorganic ions (Na + , Ca 2+ ) is that the metal binding sites on the biosorbent are limited.…”

Optimization of biochar preparation from the stem of Eichhornia crassipes using response surface methodology on adsorption of Cd2+

“…In the RSM method, to predict the optimum conditions for the preparation of ECSBC and to express the interaction between dependent and independent factors, the mathematical quadratic model shown in Eq. (1) 41 :where Y is the predicted response; β 0 is the constant; β j , β jj , and β ij refer to coefficients of linear effect, quadratic effect and interaction effect, respectively; ε is a random error; X i and X j are dimensionless coded predicted values for the independent factors. Analysis of variance (ANOVA) is used to forecast the applicability of quadratic model and the significance of each item in the equation.…”

Acetone fractionation: a simple and efficient method to improve the performance of lignin for dye pollutant removal

“…Adsorption kinetics. In order to explore the adsorption kinetics, pseudo-rst-order (7) and pseudo-second-order (8) kinetic equations were used to analyze adsorption kinetic data:…”

“…Various techniques have been used to remove dyes that include biodegradation, occulation-coagulation, chemical oxidation, ion-exchange, reverse osmosis, ultraltration and adsorption. [5][6][7][8][9] Among these techniques, adsorption is considered to be efficient and economical. [10][11][12] Activated carbon was a commonly adsorbent for dye removal, 13 while the high cost limited its application on a larger scale.…”