Adsorption of methylene blue on an agro-waste oiltea shell with and without fungal treatment

Abstract

A lignocellulosic waste oiltea shell (OTS) was evaluated as an inexpensive sorbent to remove methylene blue (MB) from aqueous solution. Fungal treatment of OTS increased the MB adsorption by modifying the physicochemical properties of OTS and simultaneously produced laccase as a beneficial co-product. Without fungal treatment, the maximum amount of adsorption (qm) of MB by OTS was 64.4 mg/g, whereas the treatment with fungus Pycnoporus sp. and Trametes versicolor increased qm up to 72.5 mg/g and 85.7 mg/g, respectively. This is because of the improved surface area and pore sizes as well as altered chemical compositions. The equilibrium sorption data for OTS both with and without treatment fitted to the Langmuir model, and the sorption rate data well fitted to the pseudo second-order kinetic model. The changes in free energy (ΔG°) and separation factor (RL) indicated that the sorption was spontaneous and favorable. Scanning electron microscopy and Fourier transform infrared spectroscopy showed the changes in the surface morphology and functional groups of OTS after fungal treatment. The agro-waste OTS could be utilized as a low-cost adsorbent for efficient dye removal, and fungal treatment can serve as a mild and clean technique to increase the adsorptive capacity of OTS.

Polyacrylamide-Phytic Acid-Polydopamine Conducting Porous Hydrogel for Efficient Removal of Water-Soluble Dyes

“…Therefore, under optimized conditions (318 K adsorption temperature, 5 mg PAAM/PA/PDA hydrogel in 8 mL solution, 50 mg L −1 initial dye concentration, and suitable pH values (5.5 for NR, 4.5 for MB, 10.0 for MV and YMB)), the maximum adsorption capacities (584.58 mg g −1 for NR, 405.99 mg g −1 for MB, 625.97 mg g −1 for MV, and 350.67 mg g −1 for YMB) can be obtained respectively. The maximum adsorption capacities are comparable to or higher than those of literature reported (as shown in Table 1 ) 14 – 23 , 39 – 49 .…”

“…Various techniques have been employed for treatment of dye-containing wastewater, including catalytic degradation 1 , ion exchange 8 , membrane separation 9 , coagulation-flocculation 10 , precipitation 11 , photo degradation 12 , biological degradation 13 and adsorption 14 – 23 , etc . Among these methods, adsorption is considered to be one of the most effective methods for its simplicity, high efficiency, flexibility, and insensitivity to toxic substance 14 , 15 .…”

Removal of Synthetic Dyes by Dried Biomass of Freshwater Moss Vesicularia Dubyana: A Batch Biosorption Study

“…Coefficients of determination (R 2 ) related to the Langmuir model applied to TT and MB biosorption data (R 2 = 0.965 for TT; R 2 = 0.990 for MB) were higher than those for the Freundlich model (R 2 = 0.955 for TT; R 2 = 0.938 for MB). In addition, the biosorption of methylene blue and thioflavin T by agricultural by-products from the hop (Humulus lupulus L.) [27] and methylene blue by water hyacinth biomass [31], agro-waste oil tea shell [13], Anethum graveolens biomass [32] and Tremella fuciformis biomass [33] was very well fitted by Langmuir model. Table 2.…”

“…To date, diverse algae, macroalgae, plant biomasses, agricultural residues as well as other biomaterials have been explored as adsorbents for removal of acidic, basic and reactive dyes from aqueous solutions [9][10][11][12][13][14][15][16][17]. Authors have reported that the biosorption capacity is highly dependent on solution pH, biosorbent dosage, temperature and concentration of other solutes present in solution.…”

Dye Removal from Aqueous Solution using Low Cost Bioadsorbents Derived from Agricultural Waste: A Review

“…and Trametes versicolor modified Oiltea shells was found to be 64.4 mg/g, 72.5 mg/g and 85.7 mg/g which indicate improved surface area and pore size as well as alteration in chemical composition and physic-chemical properties upon fungal treatment of oil tea shells. The sorption data of both Oiltea shells as such and fungus modified Oiltea shells was best represented by Langmuir adsorption isotherm and pseudo second order kinetic model; also sorption process was spontaneous and favorable [24]. Activated carbon prepared from coconut husk by sulphuric acid activation was assessed for removal of textile dyes Maxilon blue GRL and direct yellow DY 12.…”