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

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

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

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.

Application of MnO2 Materials to Dye Removal from Aqueous Solution by Adsorption

2013 ◽  
Vol 361-363 ◽  
pp. 760-763 ◽  
Author(s):  
Wei Fang Dong ◽  
Li Hua Zang ◽  
Hao Li
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Dye Removal ◽  
Good Alternative ◽  
Order Kinetic ◽  
Dye Wastewater ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The adsorption capacity was compared for the dye wastewater onto adsorbent MnO2. The effects of contact time and dosage of adsorbent were studied. The adsorption kinetics was analyzed. The results showed that MnO2 possessed higher adsorption capacity to Methylene blue than Methyl orange which the removal efficiency could reached 94.82%and 78.63% respectively under the conditions (the dosage1.2g/L, time 60min, initial dye concentration 50mg/L, pH7). The dynamical data fit well with the pseudo second order kinetic model. The MnO2 has higher Methylene blue adsorption capacity in short equilibrium times and are good alternative in wastewater treatment.

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

2021 ◽  
Vol 21 (2) ◽  
pp. 421
Author(s):  
Aldes Lesbani ◽  
Neza Rahayu Palapa ◽  
Rabelia Juladika Sayeri ◽  
Tarmizi Taher ◽  
Nurlisa Hidayati
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Layered Double Hydroxide ◽  
Physical Adsorption ◽  
Nitrogen Adsorption ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Composite Formation ◽  
Adsorption Processes ◽  
Double Hydroxide

Ni/Al layered double hydroxide was used as a starting material for composite formation with biochar as a matrix. The materials were characterized using X-ray, FTIR, nitrogen adsorption-desorption, thermal, and morphology analyses. The NiAl LDH/Biochar material is then used as an adsorbent of methylene blue from an aqueous solution. The factor that was influencing adsorption such as pH, time, methylene blue concentration, and temperature adsorption was studied systematically. The regeneration of adsorbent was performed to know the stability of NiAl LDH/Biochar under several cycle adsorption processes. The results showed that NiAl LDH/Biochar has a specific diffraction peak at 11.63° and 22.30°. NiAl LDH/Biochar has more than ten-fold surface area properties (438,942 m2/g) than biochar (50.936 m2/g), and Ni/Al layered double hydroxide (92.682 m2/g). The methylene blue adsorption on NiAl LDH/Biochar follows a pseudo-second-order kinetic adsorption model and classify as physical adsorption. The high reusability properties were found for NiAl LDH/Biochar, which was largely different from biochar and Ni/Al layered double hydroxide.

scholarly journals Elimination Study of Methylene Blue Dye Using PANI and PANI/SiO2 Composite.

2021 ◽  
Author(s):  
BENSEDIRA Abderrahim ◽  
HADDAOUI Nacerddine ◽  
DOUFNOUNE Rachida ◽  
MEZIANE Ouahiba ◽  
N. S. Labidi
Keyword(s):  
Methylene Blue ◽  
Adsorption Equilibrium ◽  
Dye Adsorption ◽  
Second Order ◽  
Blue Dye ◽  
Order Kinetic ◽  
Adsorption Models ◽  
First Order ◽  
Adsorption Processes ◽  
Pseudo Second Order

Abstract Conducting Polymeric composites have attracted great attention over the last years because of their potential uses in chemical, electronic and optical devices, and as catalysts as well as in adsorption processes. Chemical synthesis of polyaniline (PANI) and polyaniline-SiO2 composite and their adsorptive performance were reported in the present work. These materials were prepared and evaluated for their methylene blue (MB) dye adsorption characteristics from aqueous solution. Adsorption equilibrium kinetic and thermodynamic experiments of MB onto PANI and PANI/SiO2 were studied. The effects of initial dye concentration, contact time and temperature on the adsorption capacity of PANI/SiO2 for MB have been investigated. The pseudo-first order and pseudo-second order kinetic models were used to describe the kinetic data. It was found that adsorption kinetics followed the pseudo-second order at all of the studied temperatures. The Langmuir, Freundlich and Dubinin Raduschkevich adsorption models were used for the mathematical description and the fit obtained using the Dubinin Raduschkevich isotherm has a medium R2 value.

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

Molecules ◽  
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.

Preparation and Methylene Blue Adsorption Characteristics of Highly Mesoporous Rice Husk Active Carbon Prepared by an Alkali-Saving and Equipment-Friendly Method

2013 ◽  
Vol 448-453 ◽  
pp. 182-187 ◽  
Author(s):  
Da Wei Li ◽  
Xi Feng Zhu
Keyword(s):  
Methylene Blue ◽  
Removal Efficiency ◽  
Rice Husk ◽  
Active Carbon ◽  
Dye Removal ◽  
Order Kinetic ◽  
Mesopore Volume ◽  
Order Kinetic Model ◽  
Naoh Solution ◽  
Pseudo Second Order

Highly mesoporous active carbon for removing methylene blue (MB) from aqueous solution was prepared from pyrolyzed rice husk by combination of CO2activation and NaOH-solution boiling. The preparation method was found to be alkali-saving and equipment-friendly. The prepared active carbon exhibited high mesoporosity (79.1%), with mesopore volume and specific surface area up to 0.619 mL/g and 899 m2/g, respectively. At initial MB concentrations of 240-380 mg/L, the MB removal efficiency of the prepared active carbon ranged from 92% to more than 99%, fairly comparable to that of the highly mesoporous commercial active carbon used for reference. The adsorption of MB onto the prepared active carbon well followed the pseudo second-order kinetic model and Langmuir isotherm. This study indicated that highly mesoporous active carbon with large dye removal efficiency could be prepared from rice husk by an alkali-saving and equipment-friendly process.

scholarly journals Removal of Methylene Blue from Aqueous Solution by Activated Carbon Prepared from Pea Shells (Pisum sativum)

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Ünal Geçgel ◽  
Gülce Özcan ◽  
Gizem Çağla Gürpınar
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Second Order ◽  
Order Kinetic ◽  
Adsorption Processes ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models

An activated carbon was prepared from pea shells and used for the removal of methylene blue (MB) from aqueous solutions. The influence of various factors such as adsorbent concentration, initial dye concentration, temperature, contact time, pH, and surfactant was studied. The experimental data were analyzed by the Langmuir and Freundlich models of adsorption. The adsorption isotherm was found to follow the Langmuir model. The monolayer sorption capacity of activated carbon prepared from pea shell for MB was found to be 246.91 mg g−1at 25∘C. Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption processes. Kinetic studies showed that the adsorption followed pseudo-second-order kinetic model. Various thermodynamic parameters such as , , and were evaluated. The results in this study indicated that activated carbon prepared from pea shell could be employed as an adsorbent for the removal of MB from aqueous solutions.

The Study of the Modified Grain Sorghum Stalk to Remove Methylene Blue Dye from Aqueous Solution

2012 ◽  
Vol 430-432 ◽  
pp. 197-201
Author(s):  
Feng Yu Li ◽  
Sheng Hua Zhang ◽  
Jin Yi Chen
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Low Cost ◽  
Grain Sorghum ◽  
Blue Dye ◽  
Order Kinetic ◽  
Adsorption Processes ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Pyromellitic dianhydride(PMDA）- modified grain sorghum stalk was used as a novel low-cost adsorbent to remove cationic dye methylene blue(MB) from aqueous solution. Bath studies were carried out to investigate the effects of pH and retention time on the adsorption of MB. The adsorption process could obtain >98% removal percentage within 30 minutes as the MB concentration was at 200 and 300 mg/L. And for 400 mg/L MB, 99% was removed in 6 hrs. The kinetics study showed that the adsorption processes followed the pseudo-second-order kinetic model, which confirming that the sorption rate is controlled by chemical adsorption. Equilibrium isotherms were analyzed by the Langmuir and Freundlich models. Langmuir model can be fitted better than Freundlich with maximum monolayer adsorption capacity of 568.18 mg/g for MB.

scholarly journals Magnetically modified Posidonia oceanica biomass as an adsorbent for organic dyes removal

2016 ◽  
Vol 17 (2) ◽  
pp. 351 ◽  
Author(s):  
I. SAFARIK ◽  
N. ASHOURA ◽  
Z. MADEROVA ◽  
K. POSOIKOVA ◽  
E. BALDIKOVA ◽  
...  
Keyword(s):  
Organic Dyes ◽  
Posidonia Oceanica ◽  
Water Soluble ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Adsorption Processes ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Safranin O

Magnetically modified Posidonia oceanica sea grass dead biomass was employed as an adsorbent of organic dyes. The adsorption of seven water-soluble organic dyes was characterized using Langmuir adsorption model. The highest calculated maximum adsorption capacity was found for Bismarck brown Y (233.5 mg g-1), while the lowest capacity value was obtained for safranin O (88.1 mg g-1). The adsorption processes followed the pseudo-second-order kinetic model and the thermodynamic studies indicated spontaneous and endothermic adsorption.

scholarly journals Adsorption of Cu (II) and Cd (II) from Wastewater by Sodium Alginate Modified Materials

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yingying Zhao ◽  
Linchuan Zhan ◽  
Zhongjun Xue ◽  
Kianpoor Kalkhajeh Yusef ◽  
Hongxiang Hu ◽  
...  
Keyword(s):  
Sodium Alginate ◽  
Contact Time ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Solution Ph ◽  
Isothermal Adsorption ◽  
Solid Ratio ◽  
Composite Gel ◽  
Pseudo Second Order ◽  
Polluted Waters

Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g−1, and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).

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