scholarly journals Efficient Absorption of Antibiotic from Aqueous Solutions over MnO2@SA/Mn Beads and Their In Situ Regeneration by Heterogeneous Fenton-Like Reaction

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Yu Luo ◽  
Bo Bai ◽  
Honglun Wang ◽  
Yourui Suo ◽  
Yiliang Yao
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Physical Structure ◽  
Absorption Efficiency ◽  
Practical Application ◽  
Heterogeneous Fenton ◽  
Adsorptive Removal ◽  
Absorption Kinetic ◽  
Isotherm Equations

Alginate has been extensively used as absorbents due to its excellent properties. However, the practical application of pure alginate has been restricted since the saturated adsorbent has weak physical structure and could not be regenerated easily. In this study, a low-cost and renewable composite MnO2@alginate/Mn adsorbent has been prepared facilely for the absorptive removal of antibiotic wastewater. FE-SEM, FTIR, and XRD analyses were used to characterize the samples. The norfloxacin (NOR) was used as an index of antibiotics. More specifically, the batch absorption efficiency of the adsorbents was evaluated by pH, contact time with different NOR concentration, and the temperature. Thus, the performance of absorption kinetic dynamics and isotherm equations were estimated for the adsorptive removal process. Parameters includingΔG0,ΔH0, andΔS0were utilized to describe the feasible adsorption process. To regenerate the saturated absorptive sites of the adsorbent, the heterogeneous Fenton-like reactions were trigged by introduction of H2O2. The results showed that the in situ regenerating has exhibited an excellent recycling stability. The high activity and the simple fabrication of the adsorbents make them attractive for the treatment of wastewater containing refractory organic compound and also provide fundamental basis and technology for further practical application.

scholarly journals Removal of Cadmium(II) from Water using Modified Citrus limettioides Peels: Thermodynamic and Isotherm Studies

2019 ◽  
Vol 32 (1) ◽  
pp. 73-78
Author(s):  
P. Janaki ◽  
R. Sudha ◽  
T.S. Sribharathi ◽  
P. Anitha ◽  
K. Poornima ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Raw Material ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Chemically Modified ◽  
Adsorption Performance ◽  
Monolayer Adsorption ◽  
Isotherm Equations

The adsorption performance of sulphuric acid treated low cost adsorbent synthesized by using Citrus limettioides peel as an effective raw material for the removal of cadmium(II) from water. The batch adsorption method was carried out to optimize some parameters like contact time, pH and adsorbent dose. The nonlinear isotherm equations were used to calculate the different isotherm constant of five isotherm models namely Freundlich, Langmuir, Dubinin-Radushkevich, Redlich-Peterson and Sips. The Langmuir monolayer adsorption capacity of chemically modified Citrus limettioides peel was found to be 287.60 mg g-1. The negative values of ΔGº and ΔHº showed that the adsorption process is spontaneous and exothermic.

Low temperature and high performance ZnSnO thin film transistors engineered by in-situ thermal manipulation

2022 ◽  
Author(s):  
Wengao Pan ◽  
Xiaoliang Zhou ◽  
Qingping Lin ◽  
Jie Chen ◽  
Lei Lu ◽  
...  
Keyword(s):  
Thin Film ◽  
Low Temperature ◽  
Thin Film Transistors ◽  
High Performance ◽  
Low Cost ◽  
High Mobility ◽  
Processing Temperature ◽  
Practical Application ◽  
Thermal Manipulation

Thin film transistors (TFT) with low cost, high mobility and low processing temperature are key enablers for practical application, which are always contradictory. In this work, we achieved high performance...

Adsorption of Cationic Dyes from Aqueous Solution onto Rapeseed Meal

2012 ◽  
Vol 550-553 ◽  
pp. 1550-1555
Author(s):  
Guo Lan Li ◽  
Song Li ◽  
Deng Liang He ◽  
Jun Liang Du
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Cost ◽  
Agricultural Waste ◽  
Industrial Effluent ◽  
Rapeseed Meal ◽  
Adsorption Rate ◽  
Cationic Dyes ◽  
Pseudo Second Order ◽  
Isotherm Equations

Using an agricultural waste rapeseed meal (RM) as adsorbent, the adsorption of methylene blue (MB) and malachite green (MG) from aqueous solution has been studied. For this purpose, the adsorption of MB and MG onto the RM with aspects of kinetics, equilibrium and the effect of pH were investigated. The equilibrium experimental data of MB and MG is in well accordance with isotherm equations of Langmuir and Freundlich. And the maximum uptake capacities (qm) of MB and MG were 122 and 78 mg.g-1respectively. It was observed that the adsorption rate of MB and MG onto the RM were very rapid and the adsorption process followed the pseudo-second-order equation. The RM appears as a very prospective adsorbent for the removal of cationic dyes from industrial effluent due to its high uptake, rapid adsorption rate and low cost.

scholarly journals In Situ Preparation of Novel Porous Nanocomposite Hydrogel as Effective Adsorbent for the Removal of Cationic Dyes from Polluted Water

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3002 ◽  
Author(s):  
Badr M. Thamer ◽  
Ali Aldalbahi ◽  
Meera Moydeen A. ◽  
Mohamed H. El-Newehy
Keyword(s):  
Linear Models ◽  
Adsorption Process ◽  
Ph Value ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Polymerization Process ◽  
Polluted Water ◽  
Swelling Properties ◽  
Hydrogel Nanocomposite

The use of some hydrogels as adsorbents for pollutants removal from wastewater is limited due to their high swelling properties and the difficulty in recovering them after the adsorption process. To overcome these problems, a new hydrogel nanocomposite based on chitosan-grafted-polyacrylic acid/oxidized electrospun carbon nanofibers (CT-g-PAA/O-ECNFs) was prepared by an in situ grafting polymerization process. The prepared hydrogel nanocomposite was used as a novel effective and highly reusable adsorbent for the removal of methylene blue (MB) from polluted water with low cost. The morphology and the structure of CT-g-PAA/O-ECNFs were investigated by numerous techniques. The effect of incorporating O-ECNFs on the swelling capability of the prepared hydrogel was explored in distillated water and MB solution at normal pH. The effect of parameters including ratio of O-ECNFs, contact time, pH, initial concentration, and temperature on adsorption process were explored. The adsorption isotherm and kinetic were studied by numerous non-linear models. The obtained results confirmed that the incorporation of O-ECNFs into the hydrogel network decreased the swelling capacity and improved its ability towards MB dye removal. The adsorption process depended on the pH value of the dye solution. Additionally, the adsorption and kinetic results were fitted using the Freundlich isotherm model and pseudo second order model (PSO), respectively. Moreover, the new adsorbents can be recycled for at least five cycles keeping its adsorption capacity and can be easily recovered without loss in its initial weight.

scholarly journals Decolourization of malachite green using tamarind seed: Optimization, isotherm and kinetic studies

2011 ◽  
Vol 17 (1) ◽  
pp. 67-79 ◽  
Author(s):  
R. Rajeshkannan ◽  
M. Rajasimman ◽  
N. Rajamohan
Keyword(s):  
Adsorption Isotherm ◽  
Malachite Green ◽  
Adsorption Process ◽  
Low Cost ◽  
Kinetic Studies ◽  
Bet Surface Area ◽  
Adsorption Parameters ◽  
Tamarind Seed ◽  
Intra Particle Diffusion ◽  
Isotherm Equations

In this work, removal of malachite green (MG) from aqueous solution using a low cost adsorbent, tamarind seed, was investigated. The adsorbent was characterized using SEM, BET surface area analyzer, and FT-IR. Decolorization of malachite green was studied as a function of different adsorption parameters such as temperature, adsorbent dose, contact time, adsorbent size and agitation speed. These parameters were optimized using response surface methodology (RSM). The significance of different adsorption parameters along with their combined effect on the adsorption process has been established through a full 50 factorial design. Langmuir, Freundlich, Redlich Petersen, Dubnin Redushkevich and Tempkin adsorption isotherm equations were used in the equilibrium modeling. Experimental data follows Langmuir adsorption isotherm. The adsorption process follows pseudo first order and intra-particle diffusion is found to be the rate-controlling step.

Reinforced birnessite derived from spinel Mn3O4 for sustainable energy storage

2021 ◽  
Author(s):  
Tong Wang ◽  
Xiaohui Zhu ◽  
Serguei V. Savilov ◽  
Sergey M. Aldoshin ◽  
Hui Xia
Keyword(s):  
Energy Storage ◽  
Structural Stability ◽  
High Performance ◽  
Low Cost ◽  
Specific Capacity ◽  
Rechargeable Batteries ◽  
Practical Application ◽  
Electrochemical Conversion ◽  
Storage Performance

The layered birnessite derivatives as intercalation cathode materials for rechargeable batteries and supercapacitors receive great attention due to the abundant, low-cost, highly safe, and environmentally friendly manganese element. However, the practical application of chemically synthesized birnessite in energy storage has been restricted by low specific capacity and poor cyclability because of the limited interlayer metal ions intercalation and inferior structural stability during cycling. In this focused review, we discuss the origin of unsatisfying charge storage performance of the chemically synthesized birnessite and disclose the reinforced birnessite structures derived from spinel Mn3O4 by in-situ electrochemical conversion. With enhanced structural stability and large interlayer distance, the electrochemically converted birnessite shows promising electrochemical performance in various batteries and supercapacitors. Finally, critical perspectives on the future development of layered birnessite from spinel Mn3O4 are provided, which may guide advanced electrode design for high-performance sustainable batteries.

scholarly journals Producing In Situ Data From a Distance With Mobile Instant Messaging Interviews (MIMIs): Examples From the COVID-19 Pandemic

2021 ◽  
Vol 20 ◽  
pp. 160940692110296
Author(s):  
Katja Kaufmann ◽  
Corinna Peil ◽  
Tabea Bork-Hüffer
Keyword(s):  
Real Time ◽  
Instant Messaging ◽  
Low Cost ◽  
Direct Access ◽  
Communication Studies ◽  
Practical Application ◽  
Short Term ◽  
In Situ Data ◽  
Study Participants

Researching people in their chaotic and complex everyday lives is challenging for researchers at any time but especially during the application of social distancing measures. In this article, we make the case for the methodical potential of mobile messengers such as WhatsApp for qualitative mobile in situ research. We exemplify the productive use of the Mobile Instant Messaging Interview (MIMI), a research method developed by Kaufmann and Peil in 2020, to study participants’ everyday life in real-time. Based on two case studies from geography and communication studies conducted during the COVID-19 pandemic, we expound our experiences in the practical application of the MIMI approach and give recommendations. We conclude that MIMIs are a low-cost, easily feasible and short-term implemented approach for research interests across disciplines and possessing great potential for exceptional circumstances like the COVID-19 pandemic. They allow direct access to the practices and experiences of people in situ and in real-time that would otherwise stay hidden and inaccessible to social sciences. The method is suitable for research projects of any size, and can be applied as part of multi- and mixed methods designs and as well for longitudinal designs. Nonetheless, the MIMIs have to be well prepared, demand smart ways of nudging participants into elaborating their responses and require careful coordination between larger teams of researchers.

scholarly journals Adsorptive Removal of Azithromycin Antibiotic from Aqueous Solution by Azolla Filiculoides-Based Activated Porous Carbon

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3281
Author(s):  
Davoud Balarak ◽  
Amir Hossein Mahvi ◽  
Saeideh Shahbaksh ◽  
Md A. Wahab ◽  
Ahmed Abdala
Keyword(s):  
Porous Carbon ◽  
Adsorption Process ◽  
Low Cost ◽  
Reclaimed Water ◽  
Physical Nature ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Azolla Filiculoides ◽  
Potential Health ◽  
Adsorptive Removal

Due to the shortage of freshwater availability, reclaimed water has become an important source of irrigation water. Nevertheless, emergent contaminants such as antibiotics in reclaimed water can cause potential health risks because antibiotics are nonbiodegradable. In this paper, we report the adsorptive removal of azithromycin (AZM) antibiotics using activated porous carbon prepared from Azolla filiculoides (AF) (AFAC). The influence of the adsorption process variables, such as temperature, pH, time, and adsorbent dosage, is investigated and described. The prepared AFAC is very effective in removing AZM with 87% and 98% removal after the treatment of 75 min, at 303 and 333 K, respectively. The Langmuir, Temkin, Freundlich, and Dubinin–Radushkevich isotherm models were used to analyze the adsorption results. The Freundlich isotherm was best to describe the adsorption isotherm. The adsorption process follows second-order pseudo kinetics. The adsorption was endothermic (ΔH°= 32.25 kJ/mol) and spontaneous (ΔS° = 0.128 kJ/mol·K). Increasing the temperature from 273 to 333 K makes the process more spontaneous (ΔG° = −2.38 and −8.72 KJ/mol). The lower mean square energy of 0.07 to 0.845 kJ/mol confirms the process’ physical nature. The results indicate that AFAC can be a potential low-cost adsorbent of AZM from aqueous solutions.

Surface interaction of sweet potato peels (Ipomoea batata) with Cd(II) and Pb(II) ions in aqueous medium

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Aqueous Medium ◽  
Sweet Potato ◽  
Adsorption Process ◽  
Low Cost ◽  
Correlation Coefficients ◽  
Order Kinetic ◽  
Thermodynamic Evaluation ◽  
Dissociative Mechanism ◽  
Pseudo Second Order ◽  
Potato Peels

The removal of Cd(II) and Pb(II) ions from aqueous medium was studied using potato peels biomass. The adsorption process was evaluated using Atomic Absorption Spectrophotometer (AAS). The Vibrational band of the potato peels was studied using Fourier Transform Infrared Spectroscopy (FTIR). The adsorption process was carried out with respect to concentration, time, pH, particle size and the thermodynamic evaluation of the process was carried at temperatures of 30, 40, 50 and 60(0C), respectively. The FTIR studies revealed that the potato peels was composed of –OH, -NH, –C=N, –C=C and –C-O-C functional groups. The optimum removal was obtained at pH 8 and contact time of 20 min. The adsorption process followed Freundlich adsorption and pseudo second-order kinetic models with correlation coefficients (R2) greater than 0.900. The equilibrium adsorption capacity showed that Pb(II) ion was more adsorbed on the surface of the potato peels biomass versus Cd (II) ion (200.91 mg/g > 125.00 mg/g). The thermodynamic studies indicated endothermic, dissociative mechanism and spontaneous adsorption process. This study shows that sweet potato peels is useful as a low-cost adsorbent for the removal of Cd(II) and Pb(II) ions from aqueous medium.

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