Adsorption of methyl tert-butyl ether (MTBE) onto ZSM-5 zeolite: Fixed-bed column tests, breakthrough curve modelling and regeneration

Abstract

ZSM-5, as a hydrophobic zeolite, has a good adsorption capacity for methyl tert-butyl ether (MTBE) in batch adsorption studies. This study explores the applicability of ZSM-5 as a reactive material in permeable reactive barriers (PRBs) to decontaminate the MTBE-containing groundwater. A series of laboratory scale fixed-bed column tests were carried out to determine the breakthrough curves and evaluate the adsorption performance of ZSM-5 towards MTBE under different operational conditions, including bed length, flow rate, initial MTBE concentration and ZSM-5 dosage, and regeneration tests were carried out at 80, 150 and 300°C for 24 h. Dose-Response model was found to best describe the breakthrough curves. MTBE was effectively removed by the fixed-bed column packed with a ZSM-5/sand mixture with an adsorption capacity of 31.85 mg•g-1 at 6 cm bed length, 1 mL•min-1 flow rate, 300 mg•L-1 initial MTBE concentration and 5% ZSM-5 dosage. The maximum adsorption capacity increased with the increase of bed length and the decrease of flow rate and MTBE concentration. The estimated kinetic parameters can be used to predict the dynamic behaviour of column systems. In addition, regeneration study shows that the adsorption capacity of ZSM-5 remains satisfactory (>85%) after up to four regeneration cycles.

WITHDRAWN: Removal of MTBE From Groundwater Using A PRB of ZVI/Sand Mixtures: Role of Nitrate And Hardness

“…The MTBE removals in HLR of 0.23, 0.57 and 1.14 m 3 /m 2 .d were 90.32%, 77.31% and 69.47%, respectively. This is due to the fact that the motion of MTBE is speed up with an increase in the ow rate, which could cause inadequate retention time of MTBE in the PRB column (Zhang et al 2019). The obtained result showed that with increasing the amount of in ow, system e ciency decreases.…”

“…Increasing use of transportations in human societies and exploration of fossil fuels is causing various kinds of pollutants to the environment and nally to water resources. Among the existing chemical compounds in use fuels of most countries could be noted to MTBE (Zhang et al 2019). Despite the bans in some countries, it has become the second most common organics detected contamination in municipal groundwaters (Levchuk et al 2014, Purswani et al 2014, Abbasi et al 2020).…”

“…In last years, several works have been implemented on the removal of MTBE (Levchuk et al 2014, Thiruvenkatachari et al 2008, Zhang et al 2019). The major disadvantages of physical and chemical methods have produce potential of by-products with higher toxicity of the main pollutants (Liu et al 2006).…”

Adsorption of Diazo Dye from Aqueous Solutions by Magnetic Montmorillonite Composite

“…Breakthrough time is one important parameter for the evaluation of column performance. [ 43 ] Therefore, the breakthrough behavior of MagMt was examined with 100 mg L −1 BB‐Y solution at a flow rate of 6 mL min −1 . The BB‐Y concentration in the effluent slowly increased with time; the breakthrough and exhausted points were observed after 55 and 395 min, respectively (Figure 5b).…”

Synthesis of ZSM-5 zeolites from biomass power plant ash for removal of ionic dyes from aqueous solution: equilibrium isotherm, kinetic and thermodynamic analysis

“…The utilization of zeolite adsorbents to remove dyes from aqueous has been proved to be feasible. [49][50][51] In this study, the dye adsorbing effectiveness of ZSM-5 zeolite was novel to be contraposed at cationic (MB) and anionic (CR) dyes for investigation on the variation of adsorption quantity under diverse conditions. When the concentration of dye aqueous was 25 mg L À1 , the removal efficiency of MB was more than 90%, whereas that of CR was less than 80% (Table S5 †), and it was essential that there are different interaction forces between adsorbates and adsorbents, particularly to pay attention to the inuence of positive and negative charges in the dye adsorption process.…”