High Reusability of NiAl LDH/Biochar Composite in the Removal Methylene Blue from Aqueous Solution

A MgCr-based layered double hydroxide (LDH) was synthesized by a coprecipitation method, followed by an intercalation process using an oxalic anion. The materials were characterized using X-ray diffraction analysis, FT-IR spectroscopy, and pH pzc measurement. The materials were then applied as adsorbents for removal of methylene blue (MB) and rhodamine B (RhB) from aqueous solution. Pristine Mg/Cr LDH exhibited RhB adsorption capacity of 32.154 mg g⁻1, whereas the use of intercalated Mg/Cr LDH caused an increase in the capacity (139.526 mg g⁻1). Kinetic studies indicated that the dye adsorption using both LDHs followed a pseudo-second-order kinetic model; the K2 values of pristine and modified Mg/Cr LDH for RhB and MB were 6.970, 0.001, 0.426, and 2.056 g mg⁻1 min⁻1, respectively. The thermodynamic study identified that the adsorption of both dyes onto the LDHs was a spontaneous process and can be classified as physical adsorption with adsorption energies of <40 kJ/mol. Moreover, the desorption and regeneration experiments indicated the high economic feasibility and reusability of the LDHs. By using HCl as the optimal solvent, the LDHs could desorb as much as 98% of the dye and could be used as adsorbents with high adsorption capacity over three cycles.

Download Full-text

Mg-Cr Layered Double Hydroxide with Intercalated Oxalic Anion for Removal Cationic Dyes Rhodamine B and Methylene Blue

Journal of Environmental Treatment Techniques ◽

10.47277/jett/9(1)94 ◽

2020 ◽

Vol 9 (1) ◽

pp. 85-94

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Layered Double Hydroxide ◽

Rhodamine B ◽

Physical Adsorption ◽

Dye Adsorption ◽

Kinetic Studies ◽

Economic Feasibility ◽

Order Kinetic ◽

Double Hydroxide

A MgCr-based layered double hydroxide (LDH) was synthesized by a coprecipitation method, followed by an intercalation process using an oxalic anion. The materials were characterized using X-ray diffraction analysis, FT-IR spectroscopy, and pH pzc measurement. The materials were then applied as adsorbents for removal of methylene blue (MB) and rhodamine B (RhB) from aqueous solution. Pristine Mg/Cr LDH exhibited RhB adsorption capacity of 32.154 mg g⁻1, whereas the use of intercalated Mg/Cr LDH caused an increase in the capacity (139.526 mg g⁻1). Kinetic studies indicated that the dye adsorption using both LDHs followed a pseudo-second-order kinetic model; the K2 values of pristine and modified Mg/Cr LDH for RhB and MB were 6.970, 0.001, 0.426, and 2.056 g mg⁻1 min⁻1, respectively. The thermodynamic study identified that the adsorption of both dyes onto the LDHs was a spontaneous process and can be classified as physical adsorption with adsorption energies of <40 kJ/mol. Moreover, the desorption and regeneration experiments indicated the high economic feasibility and reusability of the LDHs. By using HCl as the optimal solvent, the LDHs could desorb as much as 98% of the dye and could be used as adsorbents with high adsorption capacity over three cycles.

Download Full-text

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

Mediterranean Journal of Chemistry ◽

10.13171/mjc02003131281al ◽

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.

Download Full-text

Composite of Kaolin/Sodium Alginate (SA) Beads for Methylene Blue Adsorption

ASEAN Journal of Chemical Engineering ◽

10.22146/ajche.51457 ◽

2020 ◽

Vol 19 (2) ◽

pp. 100

Author(s):

Irwin Tan Kai Ge ◽

Muhammad Wahyu Nugraha ◽

Norashikin Ahmad Kamal ◽

Nonni Soraya Sambudi

Keyword(s):

Methylene Blue ◽

Sodium Alginate ◽

Organic Molecules ◽

Dye Removal ◽

Clay Material ◽

Order Kinetic ◽

Environment Pollution ◽

Adsorption Model ◽

Adsorption Processes ◽

Pseudo Second Order

Dyeing industry is one of the fast-growing industries but at the same time has also brought us a big issue on environment pollution. Adsorption processes is the most effective method in dye removal compared to other methods of wastewater treatment. In recent years, there is an increasing interest in utilizing clay material such as kaolinite as an adsorbent to remove not only inorganic but also organic molecules. In this study, composite of kaolin-sodium alginate (SA) beads was synthesized by varying the weight of kaolin from 0.5 g to 2 g. XRD, FTIR, and surface area analyses were used to characterize the kaolin; while FTIR was used to characterize the composite where the functional groups of kaolin and SA are existing. The amount of 1 g kaolin in SA could improve the adsorption of methylene blue up to 78% of removal after 8 hours. The adsorption model fits pseudo second order kinetic and Langmuir isotherm

Download Full-text

Adsorption removal of methylene blue from aqueous solution on carbon-coated Fe3O4 microspheres functionalized with chloroacetic acid

Science and Engineering of Composite Materials ◽

10.1515/secm-2016-0138 ◽

2018 ◽

Vol 25 (2) ◽

pp. 353-361

Author(s):

Zefei Zhang ◽

Cholhwan Kim ◽

Carlos Fernandez ◽

Manickam Minakshi Sundaram ◽

Thippeswamy Ramakrishnappa ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Chloroacetic Acid ◽

Second Order ◽

Magnetic Microspheres ◽

Order Kinetic ◽

Adsorption Model ◽

Equilibrium Data ◽

Carbon Coated ◽

Pseudo Second Order

AbstractWe report the preparation and employability of carbon-coated Fe3O4(Fe3O4/C) microspheres functionalized with chloroacetic acid (CAA) for the removal of methylene blue (MB) in aqueous solution. The prepared magnetic microspheres (Fe3O4/C-CAA) were characterized by the following techniques: X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectrometer, vibrating sample magnetometry, and Brunauer-Emmett-Teller. The characterization results showed that Fe3O4/C microspheres were modified by CAA without any phase change. Fe3O4/C-CAA microspheres have higher adsorption capacity for MB compared to Fe3O4/C microspheres. The Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms, and the Langmuir adsorption model fitted well with the equilibrium data. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetics data. However, the pseudo-second-order kinetic model fitted better with the adsorption kinetics data.

Download Full-text

Sorption of Chromium(VI), Cadmium(II) Ions and Methylene Blue Dye by Pristine, Defatted and Carbonized Nigella sativa L. Seeds from Aqueous Solution

Asian Journal of Chemistry ◽

10.14233/ajchem.2021.23021 ◽

2021 ◽

Vol 33 (2) ◽

pp. 471-483

Author(s):

Patience Mapule Thabede ◽

Ntaote David Shooto ◽

Eliazer Bobby Naidoo

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Nigella Sativa ◽

Physical Adsorption ◽

Blue Dye ◽

Order Kinetic ◽

Methylene Blue Dye ◽

Solution Ph ◽

Sem Images ◽

Chromium Vi

Present study reports on the sorption study of chromium(VI), cadmium(II) ions and methylene blue dye by pristine, defatted and carbonized Nigella sativa L. seeds from aqueous solution. The removal of oil from pristine Nigella sativa L. (PNS) seeds was carried out by defatting the Nigella sativa with acetone and N,N-dimethylformamide and then labelled ANS and DNS, respectively. Thereafter the defatted ANS and DNS adsorbents were carbonized at 600 ºC for 2 h under nitrogen and labelled as CANS and CDNS. The results of pristine, defatted and carbonized seeds were compared. The removal of Cr(VI), Cd(II) and methylene blue dye from aqueous solutions was investigated by varying adsorbate concentration, solution pH, reaction contact time and temperature of the solution. The SEM images indicated that the surface morphology of PNS was irregular, whilst ANS and DNS had pores and cavities. CANS and CDNS was heterogeneous and had pores and cavities. FTIR spectroscopy showed that the adsorbents surfaces had bands that indicated a lot of oxygen containing groups. The pH of the solution had an influence on the removal uptake of Cr(VI), Cd(II) and methylene blue. The sorption of Cr(VI) decreased when pH of the solution was increased due to different speciation of Cr(VI) ions whilst the removal of Cd(II) and methylene blue increased when solution pH was increased. Pseudo first order kinetic model well described the adsorption of Cr(VI), Cd(II) and methylene blue onto PNS. On the other hand, the kinetic data for ANS, CANS, DNS and CDNS was well described by pseudo second order. Furthermore, the removal mechanism onto PNS and ANS was better described by Freundlich multilayer model. The CANS, DNS and CDNS fitted Langmuir monolayer model. Thermodynamic parameters indicated that the sorption processes of Cr(VI), Cd(II) and methylene blue was endothermic and effective at high temperatures for all adsorbents. The ΔSº and ΔHº had positive values this confirmed that the sorption of Cr(VI), Cd(II) and methylene blue onto all adsorbents was random and endothermic, respectively. The values of ΔGº confirmed that the sorption of Cr(VI), Cd(II) and methylene blue on all adsorbents was spontaneous and predominated by physical adsorption process. The CANS had highest adsorption capacity of 99.82 mg/g for methylene blue, 96.89 mg/g for Cd(II) and 87.44 mg/g for Cr(VI) followed by CDNS with 93.90, 73.91 and 65.38 mg/g for methylene blue, Cd(II) and Cr(VI), respectively. The ANS capacities were 58.44, 45.28 and 48.96 mg/g whilst DNS capacities were 48.19, 32.69 and 34.65 mg/g for methylene blue, Cd(II) and Cr(VI), respectively. PNS had the lowest sorption capacities at 43.88, 36.01 and 19.84 mg/g for methylene blue, Cd(II) and Cr(VI), respectively.

Download Full-text

Removal of Iron(II) Using Ni/Al Layered Double Hydroxide Intercalated with Keggin Ion

Molekul ◽

10.20884/1.jm.2020.15.3.600 ◽

2020 ◽

Vol 15 (3) ◽

pp. 149

Author(s):

Aldes Lesbani Lesbani ◽

Normah Normah ◽

Neza Rahayu Palapa ◽

Tarmizi Taher ◽

Roy Andreas ◽

...

Keyword(s):

Aqueous Solution ◽

Layered Double Hydroxide ◽

Adsorption Process ◽

Order Kinetic ◽

Adsorption Time ◽

Keggin Ion ◽

First Order ◽

Order Kinetic Model ◽

Pseudo First Order ◽

Double Hydroxide

Layered double hydroxide (LDH) Ni/Al-NO3 was synthesized using a coprecipitation method under base condition following with intercalation using Keggin ion [a-SiW12O40]4- to form Ni/Al-[a-SiW12O40] LDH. The LDHs were characterized using XRD, FTIR, BET, and pHpzc analyses. Furthermore, LDHs were applied as adsorbent of iron(II) from aqueous solution. The adsorption process was studied through the effect of adsorption time, the concentration of iron(II), and temperature adsorption. The results show the interlayer distance of LDHs was increased from 7.408 Å to 10.533 Å after intercalation process. The adsorption of iron(II) on LDHs showed that adsorption of iron(II) on both LDHs follows pseudo first-order kinetic model with R2 value is close to one. The adsorption process was spontaneous, with adsorption capacity up to 36.496 mg g-1.

Download Full-text

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

Mediterranean Journal of Chemistry ◽

10.13171/mjc10102001261236al ◽

2020 ◽

Vol 10 (1) ◽

pp. 33-45 ◽

Cited By ~ 2

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.

Download Full-text

Equilibrium, kinetic and thermodynamic studies of the uptake of copper by layered double hydroxide

Hemijska industrija ◽

10.2298/hemind150608005n ◽

2017 ◽

Vol 71 (5) ◽

pp. 429-437 ◽

Cited By ~ 1

Author(s):

Ayawei Nimibofa ◽

Ekubo Tobin ◽

Shooto David ◽

Wankasi Donbebe ◽

Dikio Dixon

Keyword(s):

Layered Double Hydroxide ◽

Metal Ion ◽

Copper Ions ◽

Metal Salt ◽

Physical Adsorption ◽

Second Order ◽

Isotherm Models ◽

Batch Adsorption ◽

Order Kinetic ◽

Double Hydroxide

This study explored the adsorption capacity of Mg/Al layered double hydroxide (LDH) for the removal of Cu2+ from aqueous solutions after synthesis and characterization. The effect of various operational parameters such as concentration, temperature and sorption time on the adsorption of Cu2+ was investigated using batch adsorption process experiments. It was found that layered double hydroxide (LDH) can be used as adsorbent for the removal of copper ions in aqueous solution containing low concentration of the metal salt. The average values of activation energy, isosteric heat of adsorption, entropy and enthalpy were 1.447, 12.9, 0.0137 and ?4.8390 kJ/mol, respectively. This shows that the adsorption of the metal ion on the adsorbent follows a physical adsorption mechanism. The kinetic results conform to pseudo-second order model (R2 = 0.9959) and second order kinetic model (R2 = 0.9952) while the adsorption characteristics of the adsorbent followed both Langmuir and Freundlich adsorption isotherm models.

Download Full-text

Adsorption Properties of Comb-Shaped Polycarboxylate Dispersant onto Different Crystal Pyraclostrobin Particle Surfaces

Molecules ◽

10.3390/molecules25235637 ◽

2020 ◽

Vol 25 (23) ◽

pp. 5637

Author(s):

Liying Wang ◽

Chong Gao ◽

Jianguo Feng ◽

Yong Xu ◽

Danqi Li ◽

...

Keyword(s):

Physical Adsorption ◽

Order Kinetic ◽

Adsorption Model ◽

Adsorption Models ◽

Crystal Forms ◽

Adsorption Processes ◽

Different Temperatures ◽

Pseudo Second Order ◽

The Stability ◽

Crystalline Forms

The stability of the suspension system of the two crystal forms of pyraclostrobin is evaluated using multiple light technology, and the adsorption performance of polycarboxylate dispersant on the surface of two different crystalline pyraclostrobin particles is compared in combination with XRD, FTIR, XPS, and SEM from the microscopic view. The adsorption kinetics and thermodynamics studies of 2700 on the surfaces of different crystalline forms of pyraclostrobin particles show that the adsorption process of 2700 on the surfaces of pyraclostrobin crystal forms II and IV conform to pseudo-second-order kinetic adsorption model. The Ea values for crystal forms II and IV are 12.93 and 14.39 kJ∙mol−1, respectively, which indicates that both adsorption processes are physical adsorption. The adsorption models of 2700 on the surfaces of pyraclostrobin crystal forms II and IV are in accordance with Langmuir adsorption isotherms. The ∆Gad values of crystal forms II and IV are negative and the ∆Sad values are positive at different temperatures. Therefore, the adsorption processes are spontaneous and accompanied by entropy increase. The results of this study provide an important theoretical basis for the selection of polycarboxylate dispersants in the suspension of pyraclostrobin. This study also provides a reference for the research of polycrystalline pesticide suspension concentrate.

Download Full-text