Viscose-derived activated carbons fibers as highly efficient adsorbents for dimethoate removal from water

Abstract

Extensive use of pesticides resulting in their accumulation in the environment presents a hazard for their non-target species, including humans. Hence, efficient remediation strategies are needed, and adsorption is seen as the most straightforward approach in this sense. We have studied activated carbon fibers (ACFs) derived from viscose fibers impregnated with diammonium hydrogen phosphate (DAHP). By changing the amount of DAHP in the impregnation step, the chemical composition and textural properties of ACFs are effectively tuned, affecting their performance for dimethoate removal from water. The prepared ACFs effectively reduced the toxicity of treated water samples, both deionized water solutions and spiked tap water samples, under batch conditions and in dynamic filtration experiments. Using the results of physicochemical characterization and dimethoate adsorption measurements, multiple linear regression models were made to predict performance towards dimethoate removal from water reliably. These models can be used to quickly screen among larger sets of possible adsorbents and guide the development of novel, highly efficient adsorbents for dimethoate removal from water.

Kinetics of Dimethoate, Malathion, and Chlorpyrifos Adsorption on Cellulose-derived Activated Carbons – Linking Performance to the Physicochemical Properties

“…Second, carbon content (Table 1) also seems to be a determinant for fast adsorption kinetics. As discussed before [20,21], we believe that for studied materials, physisorption is operative. Thus positive correlation of carbon content with adsorption rate constants can be understood through the reduced amount of highly solvated domains, despite the fact that O atomic content also positively correlates to adsorption rate constants (much more for malathion compared to dimethoate).…”

“…All the samples have undergone the same milling procedure, so the effects of morphology and size of particles on the adsorption performance can be excluded. Additionally, due to the same carbonization and activation temperatures, the Raman spectra of all the samples turned out to be identical [20]. Thus, the effects of the disorder degree can also be excluded.…”

“…Thus, the primary data we use here are given in Table 1. The materials studied in this work have already been investigated in terms of adsorption performance [20,21]. Still, the focus was on the thermodynamic properties and the analysis of the impact of materials' properties on the adsorption capacities.…”

“…The notation of samples is DAHP-X, where X stands for the amount of DAHP used for the impregnation step. As explained in previous publications addressing the adsorption capacities of the same series of ACFs [20,21], these materials are particularly suitable for testing different hypotheses about the adsorption process. All these materials have been derived from the same precursor and have identical morphology (Fig.…”

“…Materials synthesis is described in [20] and reproduced here for the sake of completeness. Viscose fibers (1.7 dtex, 38 mm) were first dried for 24 h at 90°C and then impregnated in DAHP solutions of different concentrations for 15 min.…”