scholarly journals Adsorption Behavior of Polyelectrolyte onto Alumina and Application in Ciprofloxacin Removal

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1554
Author(s):  
Thi Huong Dao ◽  
Ngoc Trung Nguyen ◽  
Minh Ngoc Nguyen ◽  
Cao Long Ngo ◽  
Nhu Hai Luong ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Particle Surface ◽  
Water Environment ◽  
Adsorption Behavior ◽  
Optimum Conditions ◽  
Adsorption Model ◽  
Order Model ◽  
Alumina Particles ◽  
Pseudo Second Order ◽  
Positively Charged

This study aims to investigate the adsorption behavior of a strong polyelectrolyte poly(styrenesulfonate) (PSS) onto alumina particles. Adsorption of PSS onto positively charged alumina surface increased with increasing ionic strength, indicating that non-electrostatic and electrostatic interaction controlled the adsorption. The removal of an emerging antibiotic ciprofloxacin (CFX) from water environment using PSS-modified alumina (PMA) was also studied. The removal of CFX using PMA was much higher than that using alumina particles without PSS modification in all pH ranges of 2–11. The removal of CFX reached 98% under the optimum conditions of pH 6, contact time of 120 min, adsorbent dosage of five milligrams per milliliter and ionic strength 104-M NaCl. The adsorption isotherms of CFX at different salt concentrations fit well with a two-step adsorption model, while the adsorption kinetic fit well with a pseudo-second-order model with a good correlation coefficient (R2 > 0.9969). The CFX-removal from a hospital wastewater using PMA was more than 75%. Our study demonstrates that adsorption of PSS onto alumina to modify the particle surface is important to form a novel adsorbent PMA for CFX-removal from water environments.

Biosorption of As(V) from aqueous solutions by living cells of Bacillus cereus

2012 ◽  
Vol 66 (8) ◽  
pp. 1699-1707 ◽  
Author(s):  
A. K. Giri ◽  
R. K. Patel ◽  
P. C. Mishra
Keyword(s):  
Aqueous Solutions ◽  
Bacillus Cereus ◽  
Contact Time ◽  
Living Cells ◽  
Optimum Conditions ◽  
Order Model ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Biomass Dosage ◽  
Batch Biosorption

In this work, the biosorption of As(V) from aqueous solutions by living cells of Bacillus cereus has been reported. The batch biosorption experiments were conducted with respect to biosorbent dosage 0.5 to 15 g/L, pH 2 to 9, contact time 5 to 90 min, initial concentration 1 to 10 mg/L and temperature 10 to 40 °C. The maximum biosorption capacity of B. cereus for As(V) was found to be 30.04 at pH 7.0, at optimum conditions of contact time of 30 min, biomass dosage of 6 g/L, and temperature of 30 ± 2 °C. Biosorption data were fitted to linearly transformed Langmuir isotherms with R2 (correlation coefficient) >0.99. Bacillus cereus cell surface was characterized using AFM and FTIR. The metal ions were desorbed from B. cereus using both 1 M HCl and 1 M HNO3. The pseudo-second-order model was successfully applied to predict the rate constant of biosorption.

scholarly journals Adsorption behavior of diclofenac-containing wastewater on three kinds of sewage sludge

2019 ◽  
Vol 80 (4) ◽  
pp. 717-726 ◽  
Author(s):  
Jingna Yan ◽  
Xiaohan Zhang ◽  
Wenting Lin ◽  
Chen Yang ◽  
Yuan Ren
Keyword(s):  
Ionic Strength ◽  
Adsorption Isotherm ◽  
Wastewater Treatment Plants ◽  
Ph Value ◽  
Water Environment ◽  
Organic Matter Content ◽  
Matter Content ◽  
Isotherm Models ◽  
Treatment Unit ◽  
Pseudo Second Order

Abstract Diclofenac (DCF) is one of the most frequently detected non-steroidal anti-inflammatory drugs (NSAIDs) in the water environment. One of the main removal routes of DCF in wastewater is sludge adsorption, and the mechanisms need to be investigated. In this study, the effects of adsorption time, temperature, pH value, and ionic strength on the adsorption of DCF on suspended particles (SP), secondary sedimentation tank sludge (SSTS) and concentrated sludge (CS) were investigated. The results showed that most of the adsorption of DCF by the three matrices was conducted in the first 4 h and equilibrium was achieved at 8 h. The adsorption kinetics were well fitted with the pseudo-second-order model and the rate constants were 0.29–0.88 mg·(μg·min)−1, with chemical adsorption as the dominant one. Adsorption isotherm conformed to Freundlich, Langmuir and Linear adsorption isotherm models. The order of adsorption capacity was: CS > SSTS > SP, which was proportional to the organic matter content and specific surface area of the adsorbents. The decrease of the pH value and the increase of ionic strength promoted the adsorption of DCF. The results can provide data support for the removal of DCF from different treatment unit types in wastewater treatment plants.

scholarly journals Chlorates(VII) removal on Dowex™PSR-2 resin

2016 ◽  
Vol 71 (1) ◽  
pp. 105
Author(s):  
Dorota Kołodyńska ◽  
Aleksandra Łyko ◽  
Marzena Gęca ◽  
Zbigniew Hubicki
Keyword(s):  
Solution Concentration ◽  
Intraparticle Diffusion ◽  
Optimum Conditions ◽  
Order Model ◽  
Experimental Conditions ◽  
Freundlich Model ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Pseudo Second Order ◽  
Rate Limiting

<p>Lately there has been observed the increased presence of chlorates(VII) in the natural environment which can affect human health negatively. Therefore the removal of chlorate(VII) ions using the gel type resin functionalized with the tri-n-butyl ammonium (Dowex<sup>™</sup>PSR-2) from waters was studied. The main aim was to evaluate the effects of experimental conditions including contact time, initial solution concentration, pH and temperature on chlorate(VII) ions removal as well as the anion exchanger properties on chlorate(VII) ions sorption. It was found that only the pseudo second order model described the experimental data well and the intraparticle diffusion was not the rate-limiting step. According to the Freundlich model, the q<sub>e</sub> value was to be 69.26 mg/g at optimum conditions (pH 7.0 at 25 <sup>o</sup>C).<strong></strong></p>

scholarly journals Nascent Rice Husk as an Adsorbent for Removing Cationic Dyes from Textile Wastewater

2020 ◽  
Vol 10 (10) ◽  
pp. 3437
Author(s):  
Jude Ofei Quansah ◽  
Thandar Hlaing ◽  
Fritz Ndumbe Lyonga ◽  
Phyo Phyo Kyi ◽  
Seung-Hee Hong ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Rice Husk ◽  
Textile Wastewater ◽  
Cationic Dyes ◽  
Adsorption Model ◽  
Order Model ◽  
Solution Ph ◽  
Freundlich Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

We assessed the applicability of rice husk (RH) to remove cationic dyes, i.e., methylene blue (MB) and crystal violet (CV), from water. RH thermally treated at 75 °C showed a higher adsorption capacity than that at high temperatures (300–700 °C). For a suitable CV-adsorption model, a pseudo-first-order model for MB adsorption was followed by the kinetics adsorption process; however, a pseudo-second-order model was then suggested. In the qt versus t1/2 plot, the MB line passed through the origin, but that of CV did not. The Langmuir isotherm model was better than the Freundlich model for both dye adsorptions; furthermore, the adsorption capacity for MB and CV was 24.48 mg/g and 25.46 mg/g, respectively. Thermodynamically, the adsorption of both MB and CV onto the RH was found to be spontaneous and endothermic. This adsorption increased insignificantly on increasing the solution pH from 4 to 10. With an increasing dosage of the RH, there was an increase in the removal percentages of MB and CV; however, adsorption capacity per unit mass of the RH was observed to decrease. Therefore, we conclude that utilizing RH as an available and affordable adsorbent is feasible to remove MB and CV from wastewater.

scholarly journals Tea Stem as a Sorbent for Removal of Methylene Blue from Aqueous Phase

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Tzan-Chain Lee ◽  
Shumao Wang ◽  
Zonggui Huang ◽  
Zhongxing Mo ◽  
Gangxing Wang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Ionic Strength ◽  
Aqueous Phase ◽  
Removal Efficiency ◽  
Adsorption Mechanism ◽  
Second Order ◽  
Isotherm Models ◽  
Order Model ◽  
Pseudo Second Order ◽  
Second Order Model

The potentiality of tea stem for the adsorption of methylene blue (MB) from aqueous phase was investigated. A series of operating factors, including the initial MB concentration, contact time, pH of solution, dose of tea stem, and ionic strength of solution, were conducted to understand the effect of adsorption of MB onto tea stem. Adsorption isotherm, kinetic models, thermodynamic investigation, and regenerability of tea stem were systematically investigated in this study. The experiment results revealed that the removal efficiency decreased with MB concentration and the equilibrium time of adsorption at different initial MB concentrations was approximately at 60 min. The appropriate dose of tea stem powder was found to be 4 g/L. The pHzpc of tea stem was evaluated and was observed to be 6.0 ± 0.2. The removal efficiency increased with pH ranging from 3.0 to 5.0 and remained constantly at the pH range of 5.0–11.0. The pH affected the adsorption because of the repellent power between H+ and dye cation. The ionic strength was found to have a negligible effect on the adsorption. The Langmuir and Temkin isotherm models were found to be the best isotherm models to elucidate the adsorption mechanism between MB and tea stem powder. The maximum adsorption capacity of 103.09 mg/g derived from the Langmuir model was much close to the experimental result. From the kinetic analysis, the pseudo-second-order model was found to be the suitable model to describe the adsorption behavior. The calculated adsorption capacities at different temperatures derived from the pseudo-second-order model ranging from 68.91 to 69.8 mg/g were well close to the experimental data. The intraparticle diffusion of MB molecules into pore structures of tea stem powder is the rate-limiting step for the adsorption process in this study. Evaluation of thermodynamic parameters including changes in enthalpy, entropy, and Gibb’s free energy indicated the adsorption mechanism between MB and tea stem powder was a spontaneous and exothermic process. The regeneration/adsorption experiments indicated that the tea stem powder efficiently remained more than 97% after five cycles using NaOH as a desorbing agent and thus be used for many times. On the basis of experimental results obtained, it is concluded that the tea stem has a considerable potential as a low-cost sorbent for removing MB from the aqueous phase.

scholarly journals Effectiveness of termite hill as an economic adsorbent for the adsorption of alizarin red dye

2018 ◽  
Vol 9 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Olushola S. Ayanda ◽  
Olusola S. Amodu ◽  
Habibat Adubiaro ◽  
Godwin O. Olutona ◽  
Oluwapese T. Ebenezer ◽  
...  
Keyword(s):  
Low Cost ◽  
Adsorption Model ◽  
Order Model ◽  
Alizarin Red ◽  
Langmuir Adsorption ◽  
Equilibrium Study ◽  
Natural Adsorbents ◽  
Pseudo Second Order ◽  
Red Dye ◽  
Modern Analytical

Abstract The adsorption of alizarin red (AR) dye onto termite hill sample (THs) was investigated. Prior to the adsorption studies, the elemental, morphological, surface and structural properties of THs were examined by modern analytical methods. Instrumental analysis showed that the homogenous micro-structured THs are comprised of iron oxide, silica oxide, and alumina as major components. Experiments showed that the adsorption capacity of AR decreases with increasing pH and initial AR concentrations, and increases with increasing contact time, stirring speed and temperature. The equilibrium study obeyed the Langmuir adsorption model and the kinetics followed the pseudo-second-order model. About 95.0% AR reduction (1.425 mg/g) was achieved when 0.8 g of THs was mixed with 30 mL of 40 mg/L AR solution for 120 min at 400 rpm and a pH of 2. Thermodynamic study suggested that AR adsorption onto THs is spontaneous at higher temperatures of 323 K and above (ΔGo values are negative). However, ΔGo are positive at lower temperatures of 293–313 K, which implies that the adsorption process is not spontaneous at these temperatures. This study showed that THs could be used as alternative, low-cost, natural adsorbents for the removal of dyes from wastewater.

Preparation and its Adsorption Characters of Pb2+ Ions-Imprinted Chitosan/Palygorskite Hybrid Materials

2011 ◽  
Vol 391-392 ◽  
pp. 1324-1329
Author(s):  
Ying Ying Shi ◽  
Qiang Hua Zhang ◽  
Liang Dong Feng ◽  
Qing Ping Xiong ◽  
Fei Liu
Keyword(s):  
Ph Value ◽  
Synthesis Process ◽  
Optimum Conditions ◽  
Order Model ◽  
Fast Kinetics ◽  
Kinetics Of Adsorption ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Ion Imprinting ◽  
Kinetics Of

By using Palygorskite as matrix and introducing the surface ion-imprinting concept to the synthesis process, a Palygorskite-supported organic–inorganic hybrid polymer for selective separation of Pb2+ from aqueous solutio was prepared. The prepared polymer was characterized with techniques of SEM, XRD and FT-IR. The effects of contact time, pH value and temperature of the initial solution on the adsorption characters of Pb2+ were investigated. Under the optimum conditions, the ions-imprinted polymer offered a fast kinetics for the adsorption of Pb2+ and the maximum capacity was 4.51 mg/g. And the pseudo-second order model bestly described the kinetics of adsorption of Pb2+ onto the as-prepared materials.

scholarly journals Adsorption behavior of Pb(II) onto xanthated rubber (Hevea brasiliensis) leaf powder

2011 ◽  
Vol 13 (4) ◽  
pp. 84-88 ◽  
Author(s):  
Wan Khalir ◽  
Megat Hanafiah ◽  
Siti So'ad ◽  
Wan Ngah
Keyword(s):  
Hevea Brasiliensis ◽  
Langmuir Isotherm ◽  
Adsorption Behavior ◽  
Isotherm Model ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Waste Rubber ◽  
Leaf Powder ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Adsorption behavior of Pb(II) onto xanthated rubber (Hevea brasiliensis) leaf powder A plant waste, rubber (Hevea brasiliensis) leaf powder was modified with carbon disulfide (xanthation) for the purpose of introducing sulfur groups, and the adsorbent performance in removing Pb(II) ion was evaluated. Pb(II) adsorption was confirmed by spectroscopic analysis, which involved Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The amount of Pb(II) adsorbed increased with increasing pH, contact time and concentration but slightly decreased with increasing ionic strength. Adsorption equilibrium was achieved in less than 60 min and followed the pseudo-second order model. The isotherm data indicated that Pb(II) adsorption on xanthated rubber leaf (XRL) fitted well with Langmuir isotherm model. The maximum adsorption capacity computed from the Langmuir isotherm model was 166.7 mg/g. Pb(II) adsorption occurred via ion-exchange and complexation mechanisms.

scholarly journals Adsorption behavior of phosphate on anion-functionalized nanoporous polymer

2015 ◽  
Vol 52 (3) ◽  
pp. 187-195 ◽  
Author(s):  
Zhenyu Wu ◽  
Dasheng Gao ◽  
Ningning Liu
Keyword(s):  
Adsorption Process ◽  
Treatment Method ◽  
Langmuir Model ◽  
Adsorption Behavior ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
N2 Adsorption ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Adsorption Desorption

An anion-functionalized nanoporous polymer was successfully prepared by quaternary ammonization and anion-exchange treatment method. The polymer was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, N2 adsorption/desorption isotherms and thermogravimetric analysis. Batch experiments were conducted to investigate the adsorption behavior of phosphate on the polymer. The results indicated that the experimental equilibrium data can be well described by the Langmuir model. The maximum adsorption capacity determined from the Langmuir model was 4.92 mg g−1. For kinetic study, the adsorption behavior followed the pseudo-second-order model. Thermodynamic studies indicated that the adsorption process was spontaneous and exothermic.

scholarly journals Removal of Congo Red and Procion Red Using Zn/Fe Pillared Bentonite

2021 ◽  
Vol 926 (1) ◽  
pp. 012051
Author(s):  
Desnelli ◽  
W R Asri ◽  
Hasanudin ◽  
M Said ◽  
P L Hariani
Keyword(s):  
Metal Oxide ◽  
Congo Red ◽  
Optimum Conditions ◽  
Order Model ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Congo Red Dye ◽  
Pseudo Second Order ◽  
Percentage Removal ◽  
Red Dye

Abstract The process of pillarization of metal oxide Zn/Fe compounds in bentonite has been carried out. The study of adsorbent weight, pH, adsorption time, and initial concentration were investigated to get the optimum reduction of Congo red and Procion red concentration. In addition, the pseudo kinetic also determined to investigate the rate and type of adsorption. From the experiment, the optimum conditions for removal of Congo red for the adsorbent weight, pH, and adsorption time were 0.02 g, 2, 20 minutes, respectively, while for the removal of Procion red was 0.04 g, 2, 20 minutes, respectively and both of adsorbent followed the pseudo-second-order model kinetics with chemisorption mechanism. Although the optimum conditions for removal of the two dyes were similar, in fact the percentage removal of the Congo red dye was greater. In conclusion, the Zn/Fe pillared bentonite was more suitable for the removal of the Congo red than Procion red.

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