Recikliranje ekspandiranog polistirena kao učinkovitog adsorbensa naftalena iz vodene otopine

Batch adsorption process factors [contact time (20–150 min), adsorbent dosage (0.5–1.5 g), adsorbate concentration (5–30 mg l–1), and agitation rate (100–250 rpm)] were optimised based on D-optimal Design under the Response Surface Methodology (RSM) of the Design-Expert Software (7.6.8) for the removal of naphthalene from aqueous solution using adsorbent developed from Acetylated Waste Expanded Polystyrene (AWEPs). The maximum adsorption capacity (5.6608 mg g–1) achieved was well fitted to Dubinin-Radushkevich Isotherm (R2 = 0.9949). The SSE (< 0.05) and ARE (< 4.0 %) indicated pseudo-second-order as the most suitable model. This research has demonstrated the effectiveness of the WEPs for the removal of naphthalene from the aqueous solution. This work is licensed under a Creative Commons Attribution 4.0 International License.Šaržni faktori procesa adsorpcije [vrijeme kontakta (20 – 150 min), doziranje adsorbenta (0,5 – 1,5 g), koncentracija adsorbata (5–30 mg l–1) i brzina miješanja (100–250 min–1)] optimizirani su na temelju D-optimalnog dizajna primjenom metodologije odzivne površine (RSM) programa Design-Expert (7.6.8) za uklanjanje naftalena iz vodene otopine pomoću adsorbenta razvijenog iz acetiliranog otpadnog ekspandiranog polistirena (AWEP). Ostvareni maksimalni adsorpcijski kapacitet (5,6608 mg g–1) dobro je prilagođen izotermi Dubinin-Radushkevich (R2 = 0,9949). SSE (< 0,05) i ARE (< 4,0 %) označili su pseudo-drugi red kao najprikladniji model. Ovo istraživanje pokazalo je učinkovitost WEP-a za uklanjanje naftalena iz vodene otopine. Ovo djelo je dano na korištenje pod licencom Creative Commons Imenovanje 4.0 međunarodna

Kinetic Modelling of Adsorptive Biodegradation of Anthracene onto Activated Carbon

The effect of adsorption on anthracene biodegradation in contaminated soil was studied by conducting kinetic batch tests in soil with varying degrees of commercial activated carbon (CAC) and in soil-free solution. The effect of CAC dose on the simultaneous adsorption-biodegradation of anthracene was evaluated. Adsorption-biodegradation model was adopted from the modification of a two-site kinetic numerical model by combining the elements of adsorption and biodegradation models and the validation of the model was carried out through the application of batch adsorption-biodegradation equilibrium and kinetic experimental data.  The Result obtained showed that the model predictions of the anthracene concentrations are in reasonable agreement with the experimental data. For simultaneous adsorption-biodegradation of anthracene by CAC, both adsorption rate coefficient and biodegradation rate coefficient increased with increased in CAC dose. The adsorption-biodegradation model is therefore a reasonable tool for simulating the adsorption-biodegradation behaviours of aromatic hydrocarbons in activated carbon.Keywords: Adsorption, Anthracene, Commercial Activated Carbon, Simultaneous Adsorption-Biodegradation