Adsorption Characteristics of Banana Peel in the Removal of Dyes from Textile Effluent

Abstract

Disposal of reactive dye contaminants in surface waters causes serious health risks to the aquatic living bodies and populations adjacent to the polluted water sources. This study investigated the applicability of banana peels to remediate water contamination with reactive dyes used in the textile industry. A set of batch experiments was conducted using a standard dye solution to determine optimum adsorption parameters, and these parameters were used for the removal of dyes from actual wastewater. Fitting experimental data into the isotherm and kinetic models suggested monolayer dye adsorption with chemisorption rate-limiting step. The maximum adsorption found from modeling results was 28.8 mg/g. Fourier transformed infrared (FTIR) spectra revealed the existence of hydroxyl, amine and carboxylic groups, contributing to high adsorption of dye molecules onto the adsorbent surface. About 93% of the dyes from the standard solution were removed at optimum conditions (pH—7.0, initial dye concentration—100 mg/L, contact time—60 min, and adsorbent dose—0.5 g) while this value was 84.2% for industrial textile wastewater. This difference was mainly attributed to the composition difference between the solutions. However, the removal efficiency for actual wastewater is still significant, indicating the high potentiality of banana peel removing dyes from textile effluent. Furthermore, desorption studies showed about 95% of banana peel can be recovered with simple acid-base treatment.

Banana Peel Powder as an Effective Multilayer Adsorbent of Ammonium Ions

“…As long as the solution volume and adsorbent quantity in the system remain constant, the slower adsorption at high concentration solutions can be attributed to the presence of a comparatively smaller number of active sites to remove the same number of ions. In addition, the ammonium ion removal efficiency was significantly decreased by the presence of such insufficient active sites in more concentrated solutions . The pattern of adsorption capacities of BNPP, as shown in Figure a, was consistently found to be opposite to the trend of the ammonium ion removal efficiency, as shown in Figure b.…”

“…In addition, the ammonium ion removal efficiency was significantly decreased by the presence of such insufficient active sites in more concentrated solutions. 90 The pattern of adsorption capacities of BNPP, as shown in Figure 9a, was consistently found to be opposite to the trend of the ammonium ion removal efficiency, as shown in Figure 9b.…”

Adsorptive Potential of Orange Peel Biochar for Removal of Basic Red 46 Dye and Phytotoxicity Analysis

“…BR46 dye solution contained positively and negatively charged binding sites due to this alkaline and acidic media needed for dye desorption from the surface of OPB. At low pH, the solution contains H + cations, which combine with functional groups bearing negative charges of dye molecules and desorb from the OPB surface, whereas at high pH dye molecules having positive functional groups are eliminated 10. Fig.…”

“…Due to the high molar absorption coefficients of dyes, very small amounts of dyes in water, even less than one part per million (ppm), influence its lucidity 9. Colorants limit the access of sunlight into water, inhibit photosynthesis, reduce dissolved oxygen concentration, and generate anoxic conditions to aquatic flora and fauna as well as populations adjacent to the contaminated water sources 10.…”

Biosorption behavior of acid orange 7 dye onto Cucumis sativus peel biochar and its effect on growth of Triticum aestivum

“…Dye having positive functional groups were eliminated in alkaline medium. 42 Figure 3 reflected that regenerated biochar showed 72, 63, 57, 44, and 38% AO7dye sorption efficiency up to 5 cycles, respectively. 25 Therefore, reproduced CPB can be reused feasibly for sorption of AO7 dye.…”