Adsorption of Methylene Blue on the Composite Sorbent Based on Bentonite-Like Clay and Hydroxyapatite

Abstract

The adsorption of methylene blue from model aqueous solutions on bentonite-like clay, hydroxyapatite, and a composite sorbent has been investigated. The kinetic and thermodynamic parameters of adsorption in the temperature range 298–333 К have been calculated. The process is found to obey Langmuir isotherm equation. It is spontaneous but slightly endothermic. The maximal sorption capacity of the composite sorbent toward methylene blue is 175.4 mg/g at 25 °С that is 1.3 times more than that for bentonite-like clay and 17.8 times more than that for hydroxyapatite. Kinetics of the process is due to the combination of external and internal diffusion and can be described better by the model of pseudo-second order reaction.

Adsorption Study of Rhodamine B and Methylene Blue Dyes with ZSM-5 Directly Synthesized from Bangka Kaolin without Organic Template

“…The Qm values, which represents the maximum adsorption capacity for RB and MB, are 97.08 and 128.21 mg/g, respectively. This MB adsorption capacity is quite higher than other reported adsorbent materials such as hydroxyapatite with an adsorption capacity of 9.88 mg/g [25], mordenite (37.362 mg/g) [41], but it is lower than bentonite (136.98 mg/g) [25]. Turning to the rhodamine B, the adsorption capacity in this works is higher than mordenite (3.61 mg/g) [23], montmorillonite (42.19 mg/g) [42] and bentonite (98.62 mg/g).…”

“…This Langmuir adsorption is in good accordance with the isothermal adsorption type reported by several researchers. Vezensev et al [25] reported in his findings that the adsorption of MB in bentonite-like clay and hydroxyapatite also followed the Langmuir model. The more recent findings reported by Santosa et al [26] also shows the same result.…”

“…The adsorption using Bentonite was 175.4 mg/g, 17.8 times higher than hydroxyapatite ones. [25]. Lately, Santosa et al adsorb MB using peat soil humin.…”

Methylene Blue Adsorption onto Cockle Shells-Treated Banana Pith: Optimization, Isotherm, Kinetic, and Thermodynamic Studies

“…Adsorption method appeared as the best technique among various dye removal techniques due to its good performance in the removal of different types of coloring materials [2,[4][5]. Regarding the adsorbent material, activated carbon has been commercially used for adsorption process owing to its excellent adsorption ability [6][7].…”

Исследование Сорбционных Свойств Природных Монтмориллонитовых Глин Разных Месторождений Для Очистки Воды От Ионов Свинца (II)

“…В последние годы проводятся исследования, направленные на очистку воды и почвы от соединений тяжелых металлов с использованием не только традиционных, хорошо известных сорбентов, таких как активные угли, но и доступных природных материаловминеральных алюмосиликатных адсорбентов (глины, цеолитсодержащие породы и т.д.) [5][6][7][8][9][10].…”