Removal of Methylene Blue, Rhodamine B and Ammonium Ion from Aqueous Solution by Adsorption onto Sintering Porous Materials Prepared from Coconut Husk Waste

Abstract

The present work was done in order to develop and find out suitable conversion methods for coconut husk wastes into value-added products. It is well-known that coconuts husk waste is hydrophobic therefore ethanol with different doses was used as a surfactant to enhance the removal efficiency. Treated samples at different adsorbent amounts, sintering temperatures & sintering time, stirring time, pH, and solution temperatures for color removal of Methylene Blue (MB) & Rhodamine B (RhB) and ammonium concentration were evaluated by using UV-Visible Spectroscopy. At 300˚C, results showed complete removal for MB and more than 75% for RhB, whereas removal of ammonium ion reached around 52% when sintering product from husk waste was used. Further investigation was carried out for ammonium ion to understand the desorption kinetic behaviors and isotherm models. Kinetics indicated that desorption of ammonium ion followed pseudo-first order equation. Adsorption thermodynamic parameters such as ΔG, ΔH, and ΔS followed Van't Hoff plot for adsorption and found to be negative which indicated that the adsorption process for ammonium onto coconut husk was physical, spontaneous and exothermic.

Ammonium removal by alkaline‐activated coconut coir from synthetic and ground waters

“…31,32 Coconut coir has been concerned as a biosorption material because of its low-cost, agricultural waste availability, significant adsorption potential, environment friendly, and renewability. 33 Several studies used coconut-based adsorbents to adsorb metal ions, for example, (Cd(II), Cr(III), Hg(II)), 34 As(III), 35 (Pb(II), Cu(II), Cd(II), Zn(II)), 36 dyes (e.g., Rodamine B, methylene blue), 37 phenolic pollutants, 38 inorganic anions (e.g., phosphate, nitrate, vanadate, molybdate, thiocyanate, chromate, and sulfate), 39 radionuclides (uranium and cesium-137), 40,41 and miscellaneous pollutants from water. 33 Generally, raw coconut coir was activated before usage for adsorption of pollutants.…”

Synthesis of zinc chloride activated eco-friendly nano-adsorbent (activated carbon) from food waste for removal of pollutant from biodiesel wash water

“…Usage of activated carbon (AC) as adsorbent was considered as one of the most efficient technologies for the removal of colorants, organic pollutants, chemical oxygen demand (COD), heavy metals (Li et al 2009). Activated carbon is highly porous in nature and has a wide range of practical applications because of its versatile adsorption capacity (Dabwan et al 2015). Researchers around the globe have utilized bamboo, peach stones, grass, wood, agricultural wastes like coir pith, peanut hull, rice husk, palm trees, palm stones, fruit peel, sugar beet pulp, grain sorghum, wheat husk and industrial wastes for the synthesis of activated carbon (Yalcın & Sevinc 2000;Ramakrishnan & Namasivayam 2009;Abdul-Hameed & Al-Juboury 2020a, 2020b.…”

A Combination of Waste Biomass Activated Carbon and Nylon Nanofiber for Removal of Triclosan from Aqueous Solutions

“…The agricultural wastes from coconut trees have become one of the promising materials to be used as adsorbents due to their abundance in nature, cheaper price, high porous structures, and high absorption capability. The coconut tree parts commonly used as adsorbents are the bunch [29], frond [31], pulp waste [32], husk [33], coir [34], leaves [35], and shell [36].…”