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Brilliant green dye adsorption onto composite snail shell–rice husk: Adsorption isotherm, kinetic, mechanistic, and thermodynamics analysis
Author(s) -
Popoola Lekan Taofeek,
Aderibigbe Tajudeen Adejare,
Yusuff Adeyinka Sikiru,
Munir Musleema Mofehintoluwa
Publication year - 2018
Publication title -
environmental quality management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 27
eISSN - 1520-6483
pISSN - 1088-1913
DOI - 10.1002/tqem.21597
Subject(s) - adsorption , calcination , aqueous solution , endothermic process , chemistry , fourier transform infrared spectroscopy , langmuir adsorption model , husk , langmuir , nuclear chemistry , chemical engineering , analytical chemistry (journal) , materials science , chromatography , organic chemistry , catalysis , botany , engineering , biology
This study examined the potential for a composite of snail shell–rice husk (SS‐RH) to successfully remove brilliant green dye (BGD) from aqueous solutions using the batch adsorption method. The adsorbent was synthesized by the calcination process and prepared at a calcination temperature, calcination time, and SS‐RH mixing ratio of 681.10°C, 2.61 hours (h), and 2.61 mixing ratio, respectively. The SS‐RH active functional groups were characterized by the Fourier transform infrared (FTIR) spectroscopy, while examination of its surface morphology was executed by scanning electron microscope. The effects of the BGD's initial concentration, time, pH, solution temperature, adsorbent mass dosage, and rotation speed of the stirrer on it removal were examined. The Langmuir and Sip isotherms fit well for the BGD uptake onto the SS‐RH among the two‐parameter and three‐parameter isotherms examined with R 2 values of 0.9995 and 1,000, and optimum adsorption capacities of 129.87 and 123.30 milligrams per gram (mg/g), respectively. Experimental data conformed perfectly using a pseudo‐second‐order kinetic model. The thickness of the boundary layer contributed to the adsorption, as revealed by mechanistic parameters. Thermodynamic adsorption parameters suggested that BGD adsorption onto the SS‐RH was nonspontaneous and endothermic, exhibiting a high level of disorderliness at the solid–liquid interface. The results proved SS‐RH to be a valuable, low‐cost adsorbent for BGD adsorption from aqueous solution.