scholarly journals An Efficient Strategy for Enhancing the Adsorption Capabilities of Biochar via Sequential KMnO4-Promoted Oxidative Pyrolysis and H2O2 Oxidation

2021 ◽  
Vol 13 (5) ◽  
pp. 2641
Author(s):  
Siyao Bian ◽  
Shuang Xu ◽  
Zhibing Yin ◽  
Sen Liu ◽  
Jihui Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Manganese Oxides ◽  
Pyrolysis Temperature ◽  
Optimal Temperature ◽  
High Adsorption ◽  
Modified Biochar ◽  
Oxidative Pyrolysis ◽  
Adsorption Capacities ◽  
H2o2 Oxidation

In this study, sequential KMnO4-promoted oxidative pyrolysis and H2O2 oxidation were employed to upgrade the adsorption capacities of durian shell biochar for methylene blue (MB) and tetracycline (TC) in an aqueous solution. It was found that the KMnO4/H2O2 co-modification was greatly influenced by pyrolysis temperature and the optimal temperature was 300 °C. Moreover, a low concentration of H2O2 enabled the improvement of the adsorption capabilities greatly with the catalysis of pre-impregnated manganese oxides, addressing the shortcoming of single H2O2 modification. The co-modified biochar exhibited high adsorption capabilities for MB and TC, remarkably surpassed KMnO4- and H2O2- modified biochars as well as pristine biochar. The increase of adsorption capabilities could be mainly contributed to the incorporation of MnOx and carboxyl by KMnO4-promoted oxidative decomposition and Mn-catalyzed H2O2 oxidation. This would provide a novel and efficient method for preparing highly adsorptive biochar using sequential KMnO4-promoted oxidative pyrolysis and H2O2 oxidation.

scholarly journals Studies on Synthesis, Characterization, and Adsorption of Cationic Dyes from Aqueous Solutions Using Magnetic Composite Material from Natural Clay in Central Kalimantan, Indonesia

Molekul ◽  
2018 ◽  
Vol 13 (1) ◽  
pp. 63
Author(s):  
I Made Sadiana ◽  
Karelius Karelius ◽  
Retno Agnestisia ◽  
Abdul Hadjranul Fatah
Keyword(s):  
Magnetic Material ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Composite Material ◽  
Rhodamine B ◽  
Solid Phase ◽  
Magnetic Composite ◽  
Natural Clay ◽  
Central Kalimantan ◽  
Adsorption Capacities

Clay is a natural material from crystalline silicate with layered structures, has high cation exchange capacity, and large surface area. These advantages can be used as an adsorbent for the removal of contaminants in aqueous solutions, such as heavy metals and dyes. In Indonesia, clays from Java, Sulawesi, and Sumatra islands have been used as adsorbent, furniture, and construction materials. Due to limited information about basic characteristics of clay from Kalimantan, this clay has not been utilized well. Therefore, natural clay from Kalimantan, especially in Central Kalimantan, was used as adsorbent of cationic dyes in this present study. However, the clay has difficulty for separating the solid phase from aqueous solution after adsorption process. To solve this problem, combining clay with magnetic material was opted. The objectives of this study are to synthesize the magnetic composite material from natural clay by coprecipitation method and to characterize the synthesized magnetic composite material using an x-ray diffraction method, transmission electron microscopy, and vibrating sample magnetometer. The adsorption properties of the synthesized magnetic composite material were evaluated using rhodamine B and methylene blue dyes in aqueous solution. Before magnetic composite material was synthesized, the clay was previously being activated for removing impurities. The magnetic material formed in the structure of clay had magnetite with particle size of 2.75 nm and the magnetization value of 24.91emu/g. The adsorption capacities of natural clay, activated clay, and magnetic composite of clay in rhodamine B were 34.29, 76.27, and 81.46 mg/g, respectively, while in methylene blue were 30.25, 83.92, and 133.90 mg/g, respectively. These results suggested that magnetic composite of clay can increase the adsorption capacities against dyes and accelerate the separation of the adsorbent solid phase from aqueous solution with largest adsorption capacity on methylene blue dye.

Two-fold 2D + 2D → 2D interweaved rhombus (4,4) grid: synthesis, structure, and dye removal properties in darkness and in daylight

2019 ◽  
Vol 48 (3) ◽  
pp. 1095-1107 ◽  
Author(s):  
Meng-Jung Tsai ◽  
Jheng-Hua Luo ◽  
Jing-Yun Wu
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Malachite Green ◽  
Dye Removal ◽  
Acid Orange 7 ◽  
High Adsorption ◽  
Acid Orange ◽  
Adsorption Capacities

A rhombus (4,4) grid showing two-fold 2D + 2D → 2D interweaved nets appeared to be a good adsorbent to selectively adsorb and separate anionic methyl orange (MO) and acid orange 7 (AO7) dyes over cationic methylene blue (MB) and malachite green (MG) from water with high adsorption capacities in both darkness and daylight.

scholarly journals Decontamination of Methylene Blue from Aqueous Solution by Rhamnolipid-modified Biochar

BioResources ◽  
2018 ◽  
Vol 13 (2) ◽  
Author(s):  
Meinan Zhen ◽  
Jingchun Tang ◽  
Benru Song ◽  
Xiaomei Liu
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Modified Biochar

scholarly journals Effect of zinc oxid on the bentonite ability for removing Methylene blue from solution

2013 ◽  
Vol 10 (2) ◽  
pp. 442-448
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Zinc Oxide ◽  
Solid Phase ◽  
Langmuir Model ◽  
Batch Adsorption ◽  
Adsorption System ◽  
Freundlich Model ◽  
Adsorption Capacities ◽  
Better Than

A batch adsorption system was applied to study the adsorption of methylene blue from aqueous solution by Iraqi bentonite and treated bentonite with different amount of zinc oxide (ZnO). The adsorption capacities of methylene blue onto bentonite were evaluated. The equilibrium between liquid and solid phase was described by Langmuir model better than the Freundlich model. Langmuir and Freundlich constants have been determined. The separation factor or equilibrium parameter, RL which is used to predict if an adsorption system is favourable or unfavourable was calculated for all cases.

Unexpected ultrafast and high adsorption capacity of oxygen vacancy-rich WOx/C nanowire networks for aqueous Pb2+ and methylene blue removal

2017 ◽  
Vol 5 (30) ◽  
pp. 15913-15922 ◽  
Author(s):  
Shouwei Zhang ◽  
Hongcen Yang ◽  
Huiyan Huang ◽  
Huihui Gao ◽  
Xiangxue Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Oxygen Vacancy ◽  
Solvothermal Method ◽  
High Yield ◽  
High Adsorption ◽  
One Pot ◽  
Adsorption Capacities ◽  
Methylene Blue Removal ◽  
High Adsorption Capacity ◽  
Nanowire Networks

Oxygen vacancy-rich WOx/C nanowire networks are fabricated by a one-pot and high yield solvothermal method, exhibiting ultrafast and high adsorption capacities.

Fabrication of core–shell α-MnO2@polydopamine nanocomposites for the efficient and ultra-fast removal of U(vi) from aqueous solution

2019 ◽  
Vol 48 (3) ◽  
pp. 971-981 ◽  
Author(s):  
Jianjun Wang ◽  
Junping Ma ◽  
Chenlu Zhang ◽  
Xing Li ◽  
Shuang Song ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Wastewater Treatment ◽  
Core Shell ◽  
High Adsorption ◽  
Functional Nanoparticles ◽  
Adsorption Capacities ◽  
Fast Removal

The development of functional nanoparticles with ultra-fast and high adsorption capacities is an important strategy for wastewater treatment.

scholarly journals Novel chitosan and Laponite based nanocomposite for fast removal of Cd(II), methylene blue and Congo red from aqueous solution

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 244-256
Author(s):  
Guobin Xu ◽  
Yuejun Zhu ◽  
Xiujun Wang ◽  
Shanshan Wang ◽  
Tianxiang Cheng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Congo Red ◽  
Efficient Removal ◽  
Excellent Performance ◽  
Solution Ph ◽  
Nano Composite ◽  
Composite Adsorbents ◽  
Adsorption Capacities ◽  
Adsorption Rates

AbstractA series of chitosan and Laponite based nano-composite adsorbents, which showed an excellent performance for fast and efficient removal of Cd(II), methylene blue (MB) and Congo red (CR) from aqueous solution, were prepared. In the adsorbent, with the increase of Laponite component, the surface area increased from 44.69 m2 g-1 to 64.58 m2 g-1. As a result, the adsorption rates were enhanced by increasing Laponite component. The adsorption capacities for Cd(II) and MB increased with increasing Laponite component due the cationic characteristic of two pollutants, and the opposite result was found for the removal of CR. The impacts of some factors, e.g. solution pH, temperature, pollutant concentration and salt, on the adsorption capacity were investigated. Additionally, this adsorbent could be effectively regenerated by dilute HCl solution after the adsorption of Cd(II), and the mixture of methanol and acetic acid was a suitable eluent after the adsorption of two dyes.

scholarly journals Comparison of methylene blue adsorption from aqueous solution using spent tea dust and raw coir pith

2013 ◽  
Vol 16 (1) ◽  
pp. 146-159 ◽  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Rate Constant ◽  
Low Cost ◽  
Order Rate Constant ◽  
Solution Ph ◽  
Coir Pith ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Diffusion Rate Constant

<div> <p>The purpose of the present work is to test the possibility of using the spent tea dust and raw coir pith for the removal of methylene blue (MB) from aqueous solution. The effects of the contact time, adsorbent dosage and solution pH were studied in batch experiments at 27 &deg;C. Results showed that a pH of 7 is favourable for the adsorption of dye. The isothermal data could be well described by the Langmuir equations. Kinetic parameters of adsorption such as the Langergen pseudo-first-order, pseudo-second-order rate constant and the intraparticle diffusion rate constant were determined. The adsorption capacities of Spent Tea Dust (STD) and Raw Coir Pith (RCP) were found to be 86.21 mg and 142.86 mg g<sup>-1</sup> of the adsorbent respectively. The results indicate that STD and RCP could be employed as low-cost alternatives to commercial activated carbon for the removal of dyes from aqueous solution.</p> </div> <p>&nbsp;</p>

scholarly journals Study on Adsorption of Nickel and Methylene Blue in Aqueous Solution by Magnetic Carboxylate-Rich Carbon

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Doan Van Dat ◽  
Nguyen Hoai Thuong ◽  
Tran Thi Kieu Ngan ◽  
Le Thi Thanh Nhi ◽  
Dao My Uyen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
High Adsorption ◽  
Endothermic Process ◽  
High Adsorption Capacity

In this study, magnetic carboxylate-rich carbon material (Fe3O4@CRC) was synthesized via a low-temperature carbonization method and applied as an adsorbent for adsorption of Ni(II) ions and methylene blue (MB) in aqueous solution. The synthesized Fe3O4@CRC was characterized by various techniques (XRD, FTIR, FE-SEM, TEM, EDX, VSM, and BET). The adsorption kinetics, isotherms, thermodynamics, and the effects of key adsorption factors, including the pH value, initial adsorbate concentration, contact time, adsorbent dose and temperature were investigated in detail. The results showed that Fe3O4@CRC exhibited a high adsorption capacity for MB and Ni(II) with the maximum adsorption capacity of 187.26 mg/g and 106.75 mg/g, respectively. The adsorption of MB and Ni(II) on Fe3O4@CRC was a spontaneous and endothermic process, and was best described with the first-order kinetic model, Freundlich (for MB) and Langmuir (for Ni(II)) isotherm models. In addition, Fe3O4@CRC could maintain a high adsorption capacity after many consecutive cycles. Therefore, the Fe3O4@CRC material can be used as a highly efficient adsorbent for the removal of heavy metals and dyes from wastewater due to the advantages of high adsorption performance, easy separation, and good reusability.  

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