Ultrasound-assisted adsorption of 4-dodecylbenzene sulfonate from aqueous solutions by corn cob activated carbon

Abstract

This study was aimed at removal of 4-dodecylbenzene sulfonate (DBS) ions from aqueous solutions by ultrasound-assisted adsorption onto the carbonized corn cob (AC). The main attention was focused on modeling the equilibrium and kinetics of adsorption of DBS onto the AC. The AC was prepared from ground dried corn cob by carbonization and activation by carbon dioxide at 880°C for 2h in a rotary furnace. The adsorption isotherm data were fitted by the Langmuir model in both the absence and the presence of ultrasound (US). The maximum adsorption capacities of the adsorbent for DBS, calculated from the Langmuir isotherms, were 29.41mg/g and 27.78mg/g in the presence of US and its absence, respectively. The adsorption process in the absence and the presence of US obeyed the pseudo second-order kinetics. The intraparticular diffusion model indicated that the adsorption of DBS ions on the AC was diffusion controlled as well as that US promoted intraparticular diffusion. The ΔG° values, -24.03kJ/mol, -25.78kJ/mol and -27.78kJ/mol, were negative at all operating temperatures, verifying that the adsorption of DBS ions was spontaneous and thermodynamically favorable. The positive value of ΔS°=187J/molK indicated the increased randomness at the adsorbent-adsorbate interface during the adsorption of DBS ions by the AC.

Cu(II) Ions Adsorption Using Activated Carbon Prepared from Pithecellobium Jiringa (Jengkol) Shells With Ultrasonic Assistance: Isotherm, Kinetic and Thermodynamic Studies

“…It is interesting to note that its global consumption has risen by almost 2 billion tons in 2017 [18]. Activated carbon has been prepared from Cassava peel [19], pecan shell [20], residue of biomass gasification [21], Tunisian date stones [22], hazelnut husks and shell [23][24], corncob [25] and Australian pine cones [26]. Meanwhile, activated carbon prepared from Pithecellobium jiringa shell (PJS-AC)…”

“…Ultrasound at 20 kHz has been used to restructure active binding sites of sludge to increase Cu(II) adsorption [33]. The waves produced by ultrasound also increase mass transfer in the adsorption process [13,25]. Therefore, it is desirable to apply the ultrasound method in the preparation of PJS-AC.…”

Removal of Sodium Dodecylbenzenesulfonate by Macroporous Adsorbent Resins

“…The adsorption capacity of SDBS was calculated to be 57.9 (for HP20) and 15.5 mg/g (for HP2MGL), indicating that HP20 had better adsorption capability for SDBS than HP2MGL. Moreover, such an adsorption capacity of HP20 for removal of SDBS is higher than that used with other materials, such as activated carbon (29.4 mg/g), alumina (19.8 mg/g), and zeolite (30.7 mg/g) [12,30,31,32]. …”

Adsorption of Cu(Ii) Ions in Aqueous Solution Onto Limonia Acidissima Shellbased Activated Carbon: Kinetic and Isotherm Studies

“…The effect of intial pH in the system was not investigated. However, pH 5 (±0.15), was taken into account for the current study because the maximum Cu(II) ions adsorption capacity of activated carbon was moslty found at the pH 5 [24], [32]. The contact time, initial Cu(II) ions concentration, KOH concentration and temperature of adsorption were in the range of 0-120 min, 24.45-509.81 mg/L and 27-60 o C (± 1 o C), respectively.…”

“…Lignocellulosic materials have been also investigated for raw material of activated carbon to answer the world consumption of approximately 2 billion tons in this year [18]. Among others, pecan shells [19], Cassava peel [20], biomass residue from gasification [21], hazelnut shell and husks [21], [22], Tunisian date stones [23], corn cob [24] and Casuarina equisetifolia cones [25]. Other lignocellulosic solid waste for adsorbent is Limonia acidissima fruit shell (LAFS).…”