Removal of boron from aqueous solution by using neutralized red mud

Çengeloğlu, Yunus; Tor, Ali; Arslan, Gülşin; Ersöz, Mustafa; Gezgin, Sait

doi:10.1016/j.jhazmat.2006.08.037

Cited by 132 publications

(54 citation statements)

References 38 publications

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“…Thus, several studies have reported that red mud or activated red mud can be utilized for adsorbing different pollutants from water, including phosphate [20], fluoride [21], cadmium, lead, copper [22][23][24][25], nitrate [26], arsenic [27][28][29], phenol [30], dye [31], and boron [32]. However, up to now, adsorptive removal of pesticides from aqueous phase by using red mud has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Removal of Organochlorine Pesticides from Aqueous Solution by Using Neutralized Red Mud

Özcan

Tor

Aydın

2011

CLEAN Soil Air Water

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This work describes the potential usability of neutralized red mud for the removal of organochlorine pesticides (OCPs) from aqueous solutions. After examination on the adsorption capability of neutralized red mud for all studied OCPs, the experiments were performed by employing aldrin as a model compound. The effect of several parameters, such as contact time, pH of the solution, initial aldrin concentration, and dosage of the adsorbent was evaluated by batch experiments. The determination of OCPs was carried out using traditional liquid-liquid extraction followed by a GC coupled with m-electron capture detector (GC-mECD). The results showed that adsorption equilibrium time depended upon the initial aldrin concentration and adsorption followed the second-order kinetic model. Kinetic study also indicated that the film diffusion mechanism was a main rate control mechanism. The removal was explained by considering the electrostatic interactions between metal oxides surface of the neutralized red mud and inductively charged centers (negative charge (dÀ) of chlorine atoms and positive charge (dþ) of p-cloud aromatic ring) of the aldrin molecules. In comparison to the Langmuir isotherm model, the Freundlich model better represented the adsorption data. The neutralized red mud was also succesfully employed for the removal of OCPs from real water samples, including tap water and surface (lake) water, fortified with studied OCPs.

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Section: Introductionmentioning

confidence: 99%

Removal of Organochlorine Pesticides from Aqueous Solution by Using Neutralized Red Mud

Özcan

Tor

Aydın

2011

CLEAN Soil Air Water

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“…Activated carbon [10], oxides [11][12][13], and other low-cost materials such as fly ash [14], red mud [15] and clays [16] have been used as boron adsorbents. Adsorption process can remove boron to the safe concentration and the treatment is cost-effective.…”

Section: Introductionmentioning

confidence: 99%

Boron removal from aqueous solution by direct contact membrane distillation

Hou

Wang

Sun

et al. 2010

Journal of Hazardous Materials

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“…However, for values of n greater than the unit, the adsorption process is favorable; therefore, the adsorption capacity increases, indicating that the adsorption of ions is favorable under experimental conditions studied [41][42][43]. As seen in Table 3, all values of n are greater than the unit for the Freundlich isotherm, and the temperature increases from 25°C to 50°C, indicating that the adsorption of boron MgO-500 is favored by the temperature.…”

Section: Freundlich Isothermmentioning

confidence: 91%

“…e Freundlich isotherms suggest a heterogeneous adsorbent surface and a reversible adsorption process, which considers the formation of multilayer. However, the adsorption of ion B(OH) 4-may involve different mechanisms, such as ion exchange, microprecipitation, complexation/chelation, and electrostatic attraction [40][41][42].…”

Section: Freundlich Isothermmentioning

confidence: 99%

Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

Andia

Yokoyama

Teixeira

2018

International Journal of Chemical Engineering

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In the present work, the equilibrium, thermodynamics, and kinetics of boron removal from aqueous solutions by the adsorption on commercial magnesium oxide powder were studied in a batch reactor. e adsorption efficiency of boron removal increases with temperature from 25°C to 50°C.e experimental results were fitted to the Langmuir, Freundlich, and Dubinin-Radushkevich (DR) adsorption isotherm models. e Freundlich model provided the best fitting, and the maximum monolayer adsorption capacity of MgO was 36.11 mg·g −1 . In addition, experimental kinetic data interpretations were attempted for the pseudo-first-order kinetic model and pseudo-second-order kinetic model. e results show that the pseudo-second-order kinetic model provides the best fit. Such result suggests that the adsorption process seems to occur in two stages due to the two straight slopes obtained through the application of the pseudo-first-order kinetic model, which is confirmed by the adjustment of the results to the pseudo-second-order model. e calculated activation energy (E a ) was 45.5 kJ·mol −1 , and the values calculated for ∆G°, ∆H°, and ∆S°were −4.16 kJ·mol 1 , 21.7 kJ·mol −1 , and 87.3 kJ·mol −1 , respectively. ese values confirm the spontaneous and endothermic nature of the adsorption process and indicated that the disorder increased at the solid-liquid interface. e results indicate that the controlling step of boron adsorption process on MgO is of a physical nature.

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Removal of boron from aqueous solution by using neutralized red mud

Cited by 132 publications

References 38 publications

Removal of Organochlorine Pesticides from Aqueous Solution by Using Neutralized Red Mud

Removal of Organochlorine Pesticides from Aqueous Solution by Using Neutralized Red Mud

Boron removal from aqueous solution by direct contact membrane distillation

Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

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