scholarly journals Adsorption of Phenol from Wastewater Using Calcined Magnesium-Zinc-Aluminium Layered Double Hydroxide Clay

2020 ◽  
Vol 12 (10) ◽  
pp. 4273
Author(s):  
Lehlogonolo Tabana ◽  
Shepherd Tichapondwa ◽  
Frederick Labuschagne ◽  
Evans Chirwa
Keyword(s):  
Layered Double Hydroxide ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Treatment Temperature ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Phenol Removal ◽  
Order Kinetic ◽  
Equilibrium Data ◽  
Double Hydroxide

The presence of priority and emerging aromatic-based pollutants in water sources is of growing concern as they are not bioavailable and are present in reuse plant feed streams. These pollutants have known mutagenic and carcinogenic effects and must therefore be removed. Adsorption has been widely accepted as a suitable remediation technology due to its simplicity. Clay-based adsorbents have attracted significant attention due to their low cost, environmentally benign properties and regeneration potential. The present work focused on the thermal modification of a commercial Layered Double Hydroxide (LDH) clay and its subsequent effectiveness as an adsorbent in the removal of phenol from wastewater. Calcination of the neat clay resulted in the formation of metal oxides with varying phases and crystallinity depending on the treatment temperature. The BET surface area increased by 233% upon calcination at 500 °C. The highest phenol removal (85%) was observed in the clay calcined at 500 °C compared to 10% for the neat clay. Optimization studies revealed a maximum adsorption capacity of 12 mg/g at an adsorbent loading of 10 g/L at pH 7. Phenol adsorption was postulated to occur via a two-stage intercalation and surface adsorption mechanism. The equilibrium data were best fitted on the Freundlich isotherm model which describes heterogeneous adsorption. The adsorption kinetics followed a pseudo-second-order kinetic model with rate constants of 4.4 x 10−3 g/mg.h for the first 12h and 6.1 x 10−3 g/mg.h thereafter.

scholarly journals Citrate-Zn/Al Layered Double Hydroxide as Adsorbent of Congo Red from Aqueous Solution

2020 ◽  
Vol 10 (3) ◽  
pp. 220-232
Author(s):  
Nurlisa Hidayati ◽  
Neza Rahayu Palapa ◽  
Bakri Rio Rahayu ◽  
Risfidian Mohadi ◽  
Elfita Elfita ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxide ◽  
Congo Red ◽  
Physical Adsorption ◽  
Freundlich Isotherm ◽  
Interlayer Distance ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Bet Analysis ◽  
Double Hydroxide

Layered double hydroxide (LDH) of Zn/Al and citrate-Zn/Al was prepared and used as an adsorbent of Congo red from aqueous solution. LDH was characterized by X-ray, FTIR, and BET analysis. Adsorption of Congo red was studied through kinetic, isotherm, and thermodynamic analyses. Zn/Al LDH has diffraction at 10.29o (003) with interlayer distance 8.59 Å and citrate-Zn/Al LDHs have anomalous diffraction at 7.57o (003) with interlayer distance 11.68 Å. The surface area of citrate-Zn/Al (40.50 m2 g-1) has higher than pristine LDH (1.97 m2 g-1). Adsorption of Congo red was conducted at pH 6 for Zn/Al LDH and at pH 8 for citrate-Zn/Al LDH. Adsorption of Congo red on both LDHs follows the pseudo-second-order kinetic model. The isotherm parameter follows the Freundlich isotherm model with maximum adsorption capacity 166.67 mg g-1 for Zn/Al and 249.99 mg g-1 for citrate-Zn/Al LDH. Adsorption of Congo red on both LDHs was classified as physical adsorption with energy 4.085-4.148 kJ mol-1. 

scholarly journals Equilibrium, Kinetics, and Thermodynamics of the Removal of Nickel(II) from Aqueous Solution Using Cow Hooves

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
I. Osasona ◽  
O. O. Ajayi ◽  
A. O. Adebayo
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Room Temperature ◽  
Physical Adsorption ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Equilibrium Studies ◽  
Equilibrium Data

The feasibility of using powdered cow hooves (CH) for removing Ni2+ from aqueous solution was investigated through batch studies. The study was conducted to determine the effect of pH, adsorbent dosage, contact time, adsorbent particle size, and temperature on the adsorption capacity of CH. Equilibrium studies were conducted using initial concentration of Ni2+ ranging from 15 to 100 mgL−1 at 208, 308, and 318 K, respectively. The results of our investigation at room temperature indicated that maximum adsorption of Ni2+ occurred at pH 7 and contact time of 20 minutes. The thermodynamics of the adsorption of Ni2+ onto CH showed that the process was spontaneous and endothermic. Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models were used to quantitatively analysed the equilibrium data. The equilibrium data were best fitted by Freundlich isotherm model, while the adsorption kinetics was well described by pseudo-second-order kinetic equation. The mean adsorption energy obtained from the D-R isotherm revealed that the adsorption process was dominated by physical adsorption. Powdered cow hooves could be utilized as a low-cost adsorbent at room temperature under the conditions of pH 7 and a contact time of 20 minutes for the removal of Ni(II) from aqueous solution.

Removal of Rhodamine B from Wastewater by Rectorite and Sepiolite-Kinetic Study and Equilibrium Isotherm Analyses

2011 ◽  
Vol 183-185 ◽  
pp. 362-366 ◽  
Author(s):  
Jun Li ◽  
Ming Zhen Hu
Keyword(s):  
Rhodamine B ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Order Kinetic ◽  
Isotherm Equation ◽  
Adsorption Removal ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Adsorption removal of a cationic dye, rhodamine B (RhB) from water onto rectorite and sepiolite was investigated. The rectorite and sepiolite were characterized by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). Attempts were made to fit the isothermal data using Langmuir and Freundlich equations. The experimental results have demonstrated that the equilibrium data are fitted well by a Freundlich isotherm equation. Pseudo-first-order and pseudo-second-order models were considered to evaluate the rate parameters. The experimental data were well described by the pseudo-second-order kinetic model. The results indicate that the rectorite exhibited higher adsorption capacity for the removal of RhB than sepiolite and could be employed as a low-cost alternative in wastewater treatment for the removal of cationic dyes.

scholarly journals Kush - A Potential Biosorbent in the removal of Cd (II) and Zn (II) from aqueous solution

2012 ◽  
Vol 27 ◽  
pp. 107-114
Author(s):  
Jagjit Kour ◽  
P. L. Homagai ◽  
M. R. Pokherel ◽  
K. N. Ghimire
Keyword(s):  
Low Cost ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Waste Streams ◽  
Adsorption Capacities ◽  
Optimum Ph ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

The industrial discharge of heavy metals into waters' course is one of the major pollution problems affecting water quality. Therefore, they must be removed prior to their discharge into waste streams. An efficient and low-cost bioadsorbent has been investigated from Desmostachya bipinnata (Kush) by charring with concentrated sulphuric acid and functionalized with dimethylamine.It was characterised by SEM, FTIR and elemental analysis. The effect of pH, initial concentration and contact time of the metal solution was monitered by batch method. The maximum adsorption capacities were determined for Cd and Zn at their optimum pH 6. The equilibrium data were analysed using Langmuir and Freundlich isotherm models. Langmuir isotherm model fitted well and the rate of adsorption followed the pseudo second order kinetic equation.DOI: http://dx.doi.org/10.3126/jncs.v27i1.6669 J. Nepal Chem. Soc., Vol. 27, 2011 107-114  

scholarly journals Itaconic acid-modified layered double hydroxide as a ‎novel adsorbent for effective removal of Congo red from aqueous solutions

2021 ◽  
Author(s):  
Mohammad Dinari ◽  
Shirin Shabani
Keyword(s):  
Layered Double Hydroxide ◽  
Itaconic Acid ◽  
Congo Red ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Order Kinetic ◽  
Solution Ph ◽  
Pseudo Second Order ◽  
Double Hydroxide

Abstract Herein, we report the synthesis of Cu-Ca-Al/NO3-based layered double hydroxide through co-precipitation methodology. The prepared layered double hydroxide was then modified with itaconic acid. The physicochemical properties of the prepared materials were studied using Fourier transform-infrared spectroscopy, scanning electron microscopy, X-ray diffraction analysis, thermogravimetric analysis, and nitrogen adsorption/desorption technique. The prepared materials were then applied as novel adsorbents for the removal of Congo red as a model of an anionic dye from aqueous media. To reach maximum adsorption, the effect of parameters including sample solution pH, adsorbent amount, contact time, and initial concentration of Congo red on the adsorption process was investigated. Kinetic studies were also conducted to study the mechanism of adsorption. In this regard, the kinetic models of pseudo-first-order, pseudo-second-order, Elovich, and intra-particle diffusion were studied. The results showed that the adsorption of Congo red onto Cu-Ca-Al-LDH and LDH-ITA adsorbents followed the pseudo-second-order kinetic model. To evaluate the equilibrium adsorption data, different isotherms including Langmuir, Freundlich, and Dubinin-Radushkevich were also applied. The data revealed that the Freundlich isotherm provided the best fit with the equilibrium data of both adsorbents. Maximum adsorption capacities of 81 and 84 mg g− 1 were obtained using Cu-Ca-Al-LDH and LDH-ITA adsorbents, respectively.

scholarly journals SURFACE MODIFICATION OF CANARIUM OVATUMENGL.(PILI) SHELL AS ADSORBENT OF LEAD(Pb2+) FROM AQUEOUS SOLUTION

2021 ◽  
Author(s):  
Ernesto Jr. S. Cajucom ◽  
◽  
Lolibeth V. Figueroa ◽  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Cost Effective ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Carboxylic Groups ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Surface Modified

This study was carried out to investigate the efficiency of raw pili shell (RPS) and the surface modified pili shell using EDTA (EMPS) and oxalic acid (OMPS). A comparative study on the adsorption capacity of the adsorbents was performed against lead (Pb2+) from aqueous solution. The adsorbents were characterized by FTIR, which showed higher peak of adsorption bands of carboxylic groups on the acid modified pili shells. Scanning electron microscope orSEM was also used to describe the surface morphology of the adsorbents. The linear form of Langmuir and Freundlich models were applied to represent adsorption data. The calculated equilibrium data of Pb (II) best fitted to Langmuir compare to Freundlich isotherm model with maximum adsorption capacity (qmax) of 27.03 mg/g and 45.45 mg/g using EMPS and OMPS, respectively. Kinetic sorption models were used to determine the adsorption mechanism and the kinetic data of all the adsorbents correlated (R2=1) wellwith the pseudo second order kinetic model. Among the three adsorbents, OMPS shown higher percent removal of lead compared to RPS and EMPS. The large adsorption capacity rate indicated that chemically modified pili shell in present study has great potential to be used as a cost-effective adsorbent for the removal of lead ions from the water.

scholarly journals Adsorption Study of Malachite Green Removal from Aqueous Solution Using Cu/M3+ (M3+=Al, Cr) Layered Double Hydroxide

2020 ◽  
Vol 10 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Neza Rahayu Palapa ◽  
Risfidian Mohadi ◽  
Addy Rachmat ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxide ◽  
Malachite Green ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Base Interaction ◽  
Adsorption Study ◽  
Order Kinetic Model ◽  
Endothermic Process ◽  
Double Hydroxide

Layered double hydroxide (LDH) Cu/Al and Cu/Cr had been used as adsorbent of malachite green (MG) in aqueous solution. The properties of Cu/Al and Cu/Cr LDHs were analyzed by X-ray diffraction, surface area analysis (BET) and FTIR spectroscopy. Adsorption study of MG was achieved at pH 9. Adsorption of MG follows the pseudo-second-order kinetic model. Langmuir isotherm was suitable for adsorption of MG on both LDH with a maximum adsorption capacity of 59.52 mg/g. The thermodynamic study indicated that the adsorption process is physisorption, spontaneous, and endothermic process.  Adsorption of MG onto LDHs involve the acid-base interaction between adsorbent and adsorbate.

Congo Red Dye Removal Using Ca-Al Layered Double Hydroxide: Kinetics and Equilibrium

2019 ◽  
Vol 814 ◽  
pp. 463-468 ◽  
Author(s):  
Hong Tham Nguyen Thi ◽  
Duy Chinh Nguyen ◽  
Thi Thuong Nguyen ◽  
Van Thuan Tran ◽  
Huu Vinh Nguyen ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Congo Red ◽  
Removal Rate ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Initial Concentration ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Red Dye ◽  
Double Hydroxide

This In this study, the Ca-Al layered double hydroxide was used as a potential adsorbent for the removal of Congo red from aqueous solutions. The effects of Initial concentration and contact time on the adsorption properties of Congo red by Ca-Al LDHs were studied. The removal rate of Conge red reached to 59.416 mg/g under room temperature with 0.2g of adsorbent, initial concentration of 50 ppm, adsorption time of 210 min, shaking speed of 90r/min. The experimental equilibrium data for the removal of Congo red were evaluated by various isotherm models. The pseudo-second-order kinetic models were found to fit the adsorption kinetics, and the equilibrium data were appropriately fitted to Langmuir and Freundlich model adsorption isotherm.

POTENTIAL OF HIGH QUALITY LIMESTONE AS ADSORBENT FOR IRON AND MANGANESE REMOVAL IN GROUNDWATER

2016 ◽  
Vol 78 (9-4) ◽  
Author(s):  
Nor Azliza Akbar ◽  
Hamidi Abdul Aziz ◽  
Mohd Nordin Adlan
Keyword(s):  
Langmuir Isotherm ◽  
Contact Time ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Groundwater Sample ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
High Quality ◽  
Study Results ◽  
Fe And Mn

Adsorption using low cost of media plays more attention to this current research. Previous literature found that high quality of limestone was effective in removing heavy metals in water and wastewater. In this study, the potential use of limestone media was investigated. Groundwater sample and limestone properties were characterized to determine the physical and chemical composition. The batch experiments were conducted to determine the effect of varied dosage and contact time.   Analysis on isotherm and kinetic was carried out in this study. Batch study results showed that the maximum removal of both Fe and Mn was greater than 95 and 80% respectively which occurs at optimum dosage of 40g. Moreover, the optimum contact time of Fe and Mn was 90 and 120 minutes, respectively. At the optimum contact time, 96.8% of Fe and 87.4 % of Mn was removed using limestone adsorbent media. In isotherm study, the result revealed that Langmuir isotherm fitted the experimental data better than Freundlich isotherm for both Fe and Mn adsorption. In Langmuir isotherm, the maximum adsorption capacity for both Fe and Mn were 0.018mg/g and 0.011mg/g. Based on kinetic study, the removal of Fe and Mn followed the pseudo-second order kinetic model which R2 (>0.99) greater than in pseudo-first order. This indicates that the chemisorption is the mechanism of adsorption, which contributed to the Fe and Mn removal from the groundwater sample. Thus, from these results, limestone could be used as an alternative for the removal of Fe and Mn from groundwater

scholarly journals Aplicação de material zeolítico sintetizado de cinzas de carvão como adsorvente de poluentes em água

2018 ◽  
Vol 34 (1) ◽  
pp. 45
Author(s):  
Denise Alves Fungaro ◽  
Juliana De Carvalho Izidoro ◽  
Mariza Bruno
Keyword(s):  
Methylene Blue ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Fly Ashes ◽  
Zeolitic Material ◽  
Equilibrium Data ◽  
Coal Fly Ashes ◽  
Synthesized Materials ◽  
Langmuir And Freundlich Models

Coal fly ashes treated by hydrothermal method were used as low-cost adsorbent for the removal of metals ions and dye from aqueous solution. The adsorption isotherms of the treated fly ashes were studied and results were fitted using Langmuir and Freundlich models. It shows that the Freundlich isotherm is better in describing the adsorption process for methylene blue. The equilibrium data for zinc and cadmium ions adsorption well fitted to the Langmuir equation. The maximum adsorption capacity value obtained was 0.78 (mg g-1)(L mg)1/n for methylene blue, 38.05 mg g-1 for Zn2+ and 67.48 mg g-1 for Cd2+. The synthesized materials exhibit much higher adsorption capacities than raw fly ashes. The study showed that the zeolitic material can effectively adsorb methylene blue and metals ions with removal efficiencies ranging from 82-99%.

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