Investigation on the montmorillonite adsorption of biocidal compounds incorporating thermodynamical-based multicomponent adsorption isotherm

Choe

Environmental Engineering Research

et al. 2021

Because disinfectants have been essential during the COVID-19 pandemic, the global demand for benzalkonium chlorides (BACs) has significantly increased. BACs can inactivate coronaviruses, but are known as toxic. In this study, we investigated the adsorption mechanisms of BAC12, BAC14, and BAC16 in water using powdered activated carbon (PAC). The effects of the reaction time, pH, and temperature on the adsorption kinetics of BACs were examined. The adsorption reaction followed pseudo-second-order kinetics, and better fitted to the Langmuir isotherm than the Freundlich isotherm. The best adsorption of BACs was achieved at neutral pH conditions. Thermodynamic analysis revealed that adsorption of BACs onto PAC is a spontaneous and endothermic process. Competitive adsorption experiments revealed that BACs with longer alkyl chains were adsorbed more effectively onto PAC than shorter alkyl chain BACs, implying that, while the electrostatic interaction is an important adsorption mechanism for BAC12, van der Waals interaction plays a more important role during the adsorption of BAC14 and BAC16. Finally, we observed the partial detoxification (69%) BAC in adsorption treated water with PAC using a Microtox test.

Section: Introductionmentioning

confidence: 99%

Adsorption of benzalkonium chlorides onto powdered activated carbon: mechanisms and detoxification

Choe

Environmental Engineering Research

et al. 2021

“…There are many studies in literature about the adsorption of benzalkonium chloride, but not on the benzalkonium bromide. At the present, in the scientific literature, the removal of benzalkonium chloride was analyzed in presence of a hydrophobic polymer adsorbent called Amberlite XAD-16 [14], a granular activated carbon [15], pristine and organo-bentonite [16].…”

Section: Introductionmentioning

confidence: 99%

Benzalkonium Bromide Cationic Surfactant Removal from Wastewater Using Magnetite Nanomaterial

Păun¹,

Covaliu²,

Pirvu³

et al. 2020

Rev. Chim.

The cationic surfactants have various applications being found in personal care products, detergents, cleaning products, disinfectants, hair conditioners, etc. Cationic surfactants are presented in domestic or industrial wastewater, being very resistant pollutants to biodegradation during conventional wastewater treatment (WT) methods, which generated the need to develop new efficient alternative methods. One of the alternative to conventional WT methods involves the utilization of the adsorbent nanomaterials, which are highly efficient, easy to operate, environmental friendly and cost effective. In this study, it was investigated the adsorption process of a cationic surfactant, benzyldodecyldimethylammonium bromide (benzalkonium bromide) from wastewater on magnetite nanomaterial. The adsorption investigation of benzalkonium bromide was analyzed by TOC analysis and the maximum adsorption efficiency obtained was 91.4 %. The experimental data fitted very well with Langmuir model, the correlation coefficient (R2) being 0.9792.

“…The sorption isotherms were fitted to the Langmuir (Equation 3), Freundlich (Equation 4) and Langmuir–Freundlich (LF) dual-site (Equation 5) models. The Langmuir model considers monolayer sorption on a homogeneous sorbent surface (Langmuir, 1916), whereas the Freundlich isotherm assumes the formation of multilayers on the heterogeneous surface of the sorbent (Freundlich et al , 1906), in which the parameters K F and n are related to the sorption capacity and sorption favourability, respectively (Ong et al , 2014). The LF dual-site model suggests the existence of various binding sites (homogeneous and heterogeneous) with various affinity parameters (Umpleby et al , 2001):where q m (mg g −1 ) is the maximum adsorption capacity, K L (L mg −1 ) is the equilibrium constant of the Langmuir model, C e (mg L −1 ) is the concentration of sorbate in equilibrium, K F (mg g −1 (L mg −1 ) 1/ n ) is the Freundlich parameter and n the heterogeneity factor.…”

Section: Methodsmentioning

confidence: 99%

“…The sorption isotherms were fitted to the Langmuir (Equation 3), Freundlich (Equation 4) and Langmuir-Freundlich (LF) dual-site (Equation 5) models. The Langmuir model considers monolayer sorption on a homogeneous sorbent surface (Langmuir, 1916), whereas the Freundlich isotherm assumes the formation of multilayers on the heterogeneous surface of the sorbent (Freundlich et al, 1906), in which the parameters K F and n are related to the sorption capacity and sorption favourability, respectively (Ong et al, 2014). The LF dual-site model suggests the existence of various binding sites (homogeneous and heterogeneous) with various affinity parameters (Umpleby et al, 2001):…”

Section: Measurements Of Removal Efficiency and Sorption Isothermmentioning

confidence: 99%

Artificial colouration of smectite through adsorbing dyes from wastewater to make a hybrid pigment

Rodrigues

Anaissi

2022

Clay miner.