Giombo persimmon seed (GPS) an alternative adsorbent for the removal Toluidine Blue dye from aqueous solutions

Abstract

Giombo persimmon seeds (GPS) (Diospyrus kaki L) were used as a novel low-cost adsorbent for the removal of Toluidine Blue dye (TB) from aqueous solution by batch contact adsorption mode at 25˚C. The GPS adsorbent was characterized by specific surface area (Brunauer-Emmett-Teller), scanning electron microscopy, infrared spectroscopy (ATR-FTIR), thermal analysis, point of zero charge, and Boehm titration techniques. The effects of initial pH of solution, adsorbent dosage, contact time, and initial dye concentration on TB adsorption were investigated. Kinetic data were evaluated by pseudo-first-order, pseudosecond-order, and Elovich models. The equilibrium adsorption was analyzed by Langmuir, Freundlich, and Sips isotherms models. Desorption studies were also performed. The results indicated that the Elovich model agreed very well with the kinetic data. The equilibrium data of adsorption of TB onto GPS were better fitted using Sips isotherm. The maximum adsorption capacity was 34.73 mg g −1. Good regeneration (93.5%) of GPS adsorbent was obtained using 2.00 mol L −1 CH 3 COOH as eluent. The GPS adsorbent can be used in the future as an alternative low-cost adsorbent for the treatment of waters contaminated with TB dye.

Adsorption of Brilliant Green Dye Using Raw and Activated Adsorbent Prepared from Sesbania Leaves

“…Various types of adsorbents such as natural, agricultural, industrial wastes and their prepared activated adsorbent in adsorption process are more attractive due to their easy availability, low-cost or no cost and minimum sludge production [19]. Previously researchers reported different type of low cost adsorbents and activated adsorbents such Assalix alba leaves [20], chemically modified areca nut husk [21], chemically activated date pit carbon [22], activated carbon prepared from waste banana peels [23], activated carbon derived from medlar seeds [24], activated carbon [25], Giombo persimmon seed [26], activated carbon prepared from flamboyant pod, eucalyptus tree, coconut shell and corn cob [27] and nanohydroxyapatite/chitosan composite [28] for removal of brilliant green dye from wastewater.…”

Removal of Cobalt Metal Ion from Aqueous Solution using Punica granatum Stem Powder as Biosorbent

“…[15] Adsorbent synthesis practiced through chemical and physical methodology requires heavy use of chemicals, various instrumental techniques which leads to the generation of pollutants in the environment by any means and serious problem of deposition of pollutants. [16] The researchers largely practice adsorbent synthesized through green manner for removal of heavy metals as the starting material is plant material, including various parts, agricultural waste, animal waste, and various fungus and bacteria employed for adsorbent synthesis. [17] Adsorbent produced from environmental factors is of low cost and ecofriendly and recyclability of adsorbent can be achieved.…”