scholarly journals Sorption Features of Polyurethane Foam Functionalized with Salicylate for Chlorpyrifos: Equilibrium, Kinetic Models and Thermodynamic Studies

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2036
Author(s):  
Mohamed El Bouraie ◽  
Amr Abdelghany
Keyword(s):  
Polyurethane Foam ◽  
Calculated Data ◽  
Freundlich Isotherm ◽  
Agitation Speed ◽  
Bet Surface Area ◽  
Batch Experiments ◽  
Rate Determining Step ◽  
Vis Spectroscopy ◽  
Elovich Equation ◽  
Pseudo Second Order

Commercial polyurethane foam was treated with salicylate salt to synthesize PUFSalicylate (PUFS) as a novel, promising, stable and inexpensive adsorbent for chlorpyrifos (CPF) extraction. The properties of PUFS were investigated using UV–Vis spectroscopy, apparent density, FTIR spectroscopy, pHZPC, BET surface area, elemental analysis, TGA and DTG tests. Batch experiments were performed for the sorption of CPF under different salicylate concentrations, pH, shaking time, ionic strength, agitation speed, sorbent mass, batch factor and initial concentration of CPF. The results confirmed that 97.4% of CPF in a 25 mL solution, 10 μg/L concentration, could be retained by only 0.3 mg of PUFS (1:105mass ratio of PUFS: solution). In addition, the maximum capacity of PUFS for the sorption of CPF was 1249.8 μg/mg (3.9 × 10−5 mol/g) within 180 min. The negative values of ΔH° and ΔG° indicated that the sorption of CPF onto PUFS is an exothermic spontaneous process (favorable). The calculated data from the experimental procedures fitted perfectly with Freundlich isotherm (R2 = 0.9952) and the kinetic Equation of pseudo-second order. In addition, the R2 value in the Elovich Equation recorded higher when compared to the Morris–Weber and Bangham Equations; hence, the pore diffusion is not the rate-determining step. Thus, the use of PUFSalicylate for the removal of chlorpyrifos contaminations from agriculture runoff is applicable.

scholarly journals The Presence of Cu Facilitates Adsorption of Tetracycline (TC) onto Water Hyacinth Roots

2018 ◽  
Vol 15 (9) ◽  
pp. 1982 ◽  
Author(s):  
Xin Lu ◽  
Beibei Tang ◽  
Qi Zhang ◽  
Lizhu Liu ◽  
Ruqin Fan ◽  
...  
Keyword(s):  
Water Hyacinth ◽  
Freundlich Isotherm ◽  
Root Surface ◽  
Interactive Effects ◽  
Order Kinetic ◽  
Batch Experiments ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ph Range

Batch experiments were conducted to investigate the adsorption characteristics of tetracycline (TC), and the interactive effects of copper (Cu) on the adsorption of TC onto water hyacinth roots. TC removal efficiency by water hyacinth roots was ranging from 58.9% to 84.6%, for virgin TC, 1:1 TC-Cu and 1:2 TC-Cu. The Freundlich isotherm model and the pseudo-second-order kinetic model fitted the adsorption data well. Thermodynamics parameters ΔG0 for TC were more negative in the TC plus Cu than the TC-only treatments, indicating the spontaneity of TC adsorption increased with increasing of Cu concentrations. An elevated temperature was associated with increasing adsorption of TC by water hyacinth roots. The additions of Cu(II) significantly increased TC adsorption onto water hyacinth roots within the pH range 4 to 6, because copper formed a strong metal bridge between root surface and TC molecule, facilitating the adsorption of TC by roots. However, Cu(II) hindered TC adsorption onto water hyacinth roots on the whole at pH range from 6–10, since the stronger electrostatic repulsion and formation of CuOH+ and Cu(OH)2. Therefore, the interaction between Cu(II) and TC under different environmental conditions should be taken into account to understand the environmental behavior, fate, and ecotoxicity of TC.

Sorption of Acid Blue 9 on to Wheat Bran: Optimization, Equilibrium and Kinetic Studies

2010 ◽  
Vol 5 (1) ◽  
Author(s):  
Rajeshkannan Rajan ◽  
Manivasagan Rajasimman ◽  
Rajamohan Natarajan
Keyword(s):  
Wheat Bran ◽  
Contact Time ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Agitation Speed ◽  
Initial Substrate ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Equations ◽  
Acid Blue ◽  
Adsorbent Dose

In this study, the use of wheat bran as a possible adsorbent has been successfully demonstrated in the removal of Acid blue9 (AB9) from aqueous solution. The effect of different parameters such as temperature, adsorbent dose, contact time, adsorbent size and agitation speed were investigated. The optimum conditions obtained from response surface methodology are: temperature-38.1°C, adsorbent dose (3.1g/L), contact time (206 min), adsorbent size 0.1mm (150mesh), and agitation speed (222rpm). The effect of pH and initial substrate concentration were studied. The pseudo-first order and pseudo-second order kinetics were tested. The sorption equilibrium, expressed by the Langmuir and Freundlich equations, indicated that the process was in compliance with Freundlich isotherm.

scholarly journals Banana Fibers as Sorbent for Removal of Acid Green Dye from Water

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Siti Kartina Abdul Karim ◽  
Soh Fong Lim ◽  
S. N. David Chua ◽  
Shanti Faridah Salleh ◽  
Puong Ling Law
Keyword(s):  
Freundlich Isotherm ◽  
Sorption Process ◽  
Agitation Speed ◽  
Second Order ◽  
Order Kinetic ◽  
Solution Ph ◽  
Banana Fiber ◽  
Banana Fibers ◽  
Pseudo Second Order ◽  
Banana Leaves

In this study, banana fibers extracted from banana leaves, stem, and stalk were used to remove acid green dye from aqueous solution. Three initial concentrations (750, 1000, and 1500 ppm) were chosen to determine the kinetic characteristics of the banana fiber sorbents at 25°C, agitation speed of 200 rpm, and total contact time of 3 hours. The pseudo-first-order, pseudo-second-order, and Dunwald-Wagner kinetic models were applied to the experimental kinetic data. For isotherm study, the batch experiments were performed at 25°C, initial pH 2, agitation speed of 200 rpm, and initial concentrations between 100 and 2000 ppm. The experimental data was fitted to the Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherms. The equilibrium was achieved in less than 90 minutes. The removal of the acid green dye was found to be following closely the pseudo-second-order kinetic model. For equilibrium study, the Freundlich isotherm was found to fit well with adsorption of acid green dye on the banana leaves, stem, and stalk sorbents. The calculated mean free energy of 4–11 J/mol indicated that the sorption process was mostly physical in nature. Experimental results also showed the adsorption performance is greatly affected by the initial solution pH.

scholarly journals Phragmites karkaas a Biosorbent for the Removal of Mercury Metal Ions from Aqueous Solution: Effect of Modification

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Muhammad Hamid Raza ◽  
Aqsa Sadiq ◽  
Umar Farooq ◽  
Makshoof Athar ◽  
Tajamal Hussain ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Freundlich Isotherm ◽  
Agitation Speed ◽  
Second Order ◽  
Ion Concentration ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Phragmites Karka

Batch scale studies for the adsorption potential of novel biosorbentPhragmites karka(Trin), in its natural and treated forms, were performed for removal of mercury ions from aqueous solution. The study was carried out at different parameters to obtain optimum conditions of pH, biosorbent dose, agitation speed, time of contact, temperature, and initial metal ion concentration. To analyze the suitability of the process and maximum amount of metal uptake, Dubinin-Radushkevich (D-R) model, Freundlich isotherm, and Langmuir isotherm were applied. The values ofqmaxfor natural and treated biosorbents were found at 1.79 and 2.27 mg/g, respectively. The optimum values of contact time and agitation speed were found at 50 min and 150 rpm for natural biosorbent whereas 40 min and 100 rpm for treated biosorbent, respectively. The optimum biosorption capacities were observed at pH 4 and temperature 313 K for both naturalP. karkaand treatedP. karka.RLvalues indicate that comparatively treatedP. karkawas more feasible for mercury adsorption compared to naturalP. karka. Both pseudo-first-order and pseudo-second-order kinetic models were applied and it was found that data fit best to the pseudo-second-order kinetic model. Thermodynamic studies indicate that adsorption process was spontaneous, feasible, and endothermic.

scholarly journals KINETICS, EQUILIBRIUM AND MECHANISMS OF NI (II) AND Pb (II) ION BIOSORPTION USING BIOSORBENT MIXTURE OF RHIZOPHORA APICULATE SP. AND ELAEIS GUINEENSIS SP.

2018 ◽  
Vol 81 (1) ◽  
Author(s):  
M. B. Nicodemus Ujih ◽  
Mohammad Isa Mohamadin ◽  
Millaa-Armila Asli ◽  
Bebe Norlita Mohamed
Keyword(s):  
Elaeis Guineensis ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Isotherm Models ◽  
Temkin Isotherm ◽  
Ph Values ◽  
Removal Of Heavy Metals ◽  
Kinetic Mechanisms ◽  
Elovich Equation ◽  
Pseudo Second Order

The existence of metal ions in water supply has become a severe issue and created an awareness in order to find the significant methods for the removal of heavy metals (HM). In this study, the biosorbent used are Oil Palm Mesocarp Fibe (OPMF) (Elaeis guineensis sp.) and Mangrove Bark (Rhizophora apiculate sp.). These biosorbents mixed to form the biosorbent mixture (BM) to enhance the biosorption performance towards Ni (II) and Pb (II) ions. Four parameters applied to investigate the biosorption performance, i.e. reaction time, ratio/dosage, initial concentration and pH values. The biosorption performance for Pb (II) (90%, 5.7mg/g) was higher than Ni (II) (55%, 3.9mg/g). Five kinetic models were exercised to investigate the kinetic mechanisms namely pseudo-first and second-order, Bangham's theory, intra-particles diffusion and Elovich equation. The isotherm models viz. Langmuir, Freundlich, Dubinin-Radushkevich and Temkin Isotherm exercised to analyse the equilibrium biosorption data. Overall, pseudo-second-order discovered to act as biosorption kinetics for both Ni (II) and Pb (II) ions. The equilibrium biosorption data of Pb (II) was followed Temkin Isotherm, and Ni (II) supported by Freundlich Isotherm.

Adsorption Studies of Nitrobenzene onto Aminated Lignin

2011 ◽  
Vol 695 ◽  
pp. 117-120 ◽  
Author(s):  
Xiao Yan Lin ◽  
Jian Ping Zhang ◽  
Xue Gang Luo ◽  
Chi Zhang
Keyword(s):  
Hydrogen Bond ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Batch Experiments ◽  
Adsorption Ability ◽  
Hydrogen Bond Interaction ◽  
Adsorption Performance ◽  
Strong Adsorption ◽  
Adsorption Data ◽  
Pseudo Second Order

Adsorption performance of aminated lignin (AmL) for nitrobenzene (NB) removal was investigated through batch experiments. The results showed that AmL possessed strong adsorption ability for NB with hydrogen bond interaction. The equilibrium adsorption data were well represented by the Freundlich isotherm model and the saturated adsorption capacity could reach 24.2mg/g. The adsorption process was found to follow pseudo-second-order kinetics. The maximum adsorption of NB on AmL occurred around the neutral pH.

Removal of Methylene Blue and Orange-G from Waste Water Using Magnetic Biochar

2015 ◽  
Vol 14 (04) ◽  
pp. 1550009 ◽  
Author(s):  
N. M. Mubarak ◽  
Y. T. Fo ◽  
Hikmat Said Al-Salim ◽  
J. N. Sahu ◽  
E. C. Abdullah ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Contact Time ◽  
Agitation Speed ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Optimum Conditions ◽  
Magnetic Biochar ◽  
Design Expert ◽  
Orange G ◽  
Pseudo Second Order

The study on the removal of methylene blue (MB) and orange-G dyes using magnetic biochar derived from the empty fruit bunch (EFB) was carried out. Process parameters such as pH, adsorbent dosage, agitation speed and contact time were optimized using Design-Expert Software v.6.0.8. The statistical analysis reveals that the optimum conditions for the maximum adsorption of MB are at pH 2 and pH 10, dosage 1.0 g, and agitation speed and contact time of 125 rpm and 120 min respectively. While for orange-G, at pH 2, dosage 1.0 g, and agitation speed and contact time of 125 rpm and 120 min respectively. The maximum adsorption capacity of 31.25 mg/g and 32.36 mg/g for MB and orange-G respectively. The adsorption kinetic for both dyes obeyed pseudo-second order.

scholarly journals Green copper oxide nanoparticles for lead, nickel, and cadmium removal from contaminated water

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Alaa El Din Mahmoud ◽  
Khairia M. Al-Qahtani ◽  
Sahab O. Alflaij ◽  
Salma F. Al-Qahtani ◽  
Faten A. Alsamhan
Keyword(s):  
Experimental Data ◽  
Copper Oxide ◽  
Copper Oxide Nanoparticles ◽  
Bet Surface Area ◽  
Oxide Nanoparticles ◽  
Cadmium Removal ◽  
Cuo Nps ◽  
Pseudo Second Order ◽  
Isotherm And Kinetic Models ◽  
Lead Nickel

AbstractEnvironmentally friendly copper oxide nanoparticles (CuO NPs) were prepared with a green synthesis route without using hazardous chemicals. Hence, the extracts of mint leaves and orange peels were utilized as reducing agents to synthesize CuO NPs-1 and CuO NPs-2, respectively. The synthesized CuO NPs nanoparticles were characterized using scanning electron microscopy (SEM), Energy Dispersive X-ray Analysis (EDX), BET surface area, Ultraviolet–Visible spectroscopy (UV–Vis), and Fourier Transform Infrared Spectroscopy (FT-IR). Various parameters of batch experiments were considered for the removal of Pb(II), Ni(II), and Cd(II) using the CuO NPs such as nanosorbent dose, contact time, pH, and initial metal concentration. The maximum uptake capacity (qm) of both CuO NPs-1 and CuO NPs-2 followed the order of Pb(II) > Ni(II) > Cd(II). The optimum qm of CuO NPs were 88.80, 54.90, and 15.60 mg g−1 for Pb(II), Ni(II), and Cd(II), respectively and occurred at sorbent dose of 0.33 g L−1 and pH of 6. Furthermore, isotherm and kinetic models were applied to fit the experimental data. Freundlich models (R2 > 0.97) and pseudo-second-order model (R2 > 0.96) were fitted well to the experimental data and the equilibrium of metal adsorption occurred within 60 min.

scholarly journals Sawdust for the Removal of Heavy Metals from Water: A Review

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4318
Author(s):  
Elie Meez ◽  
Abbas Rahdar ◽  
George Z. Kyzas
Keyword(s):  
Heavy Metals ◽  
Adsorption Mechanism ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Suitable Material ◽  
Removal Of Heavy Metals ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
And Control ◽  
Environmental Agencies

The threat of the accumulation of heavy metals in wastewater is increasing, due to their abilities to inflict damage to human health, especially in the past decade. The world’s environmental agencies are trying to issue several regulations that allow the management and control of random disposals of heavy metals. Scientific studies have heavily focused on finding suitable materials and techniques for the purification of wastewaters, but most solutions have been rejected due to cost-related issues. Several potential materials for this objective have been found and have been compared to determine the most suitable material for the purification process. Sawdust, among all the materials investigated, shows high potential and very promising results. Sawdust has been shown to have a good structure suitable for water purification processes. Parameters affecting the adsorption mechanism of heavy metals into sawdust have been studied and it has been shown that pH, contact time and several other parameters could play a major role in improving the adsorption process. The adsorption was found to follow the Langmuir or Freundlich isotherm and a pseudo second-order kinetic model, meaning that the type of adsorption was a chemisorption. Sawdust has major advantages to be considered and is one of the most promising materials to solve the wastewater problem.

scholarly journals Interactions of Cd2+, Co2+ and MoO42− Ions with Crushed Concrete Fines

2021 ◽  
Vol 5 (2) ◽  
pp. 42
Author(s):  
Victoria K. Elmes ◽  
Nichola J. Coleman
Keyword(s):  
Contaminated Soils ◽  
Aqueous Media ◽  
Fine Fraction ◽  
Freundlich Isotherm ◽  
Crushed Concrete ◽  
Pseudo Second Order ◽  
Zero Order Reaction ◽  
Co Precipitation ◽  
Material Accounting ◽  
Effective Sorbent

Construction and demolition activities generate approximately two thirds of the world’s waste, with concrete-based demolition material accounting for the largest proportion. Primary aggregates are recovered and reused, although the cement-rich fine fraction is underutilised. In this study, single metal batch sorption experiments confirmed that crushed concrete fines (CCF) are an effective sorbent for the maximum exclusion of 45.2 mg g−1 Cd2+, 38.4 mg g−1 Co2+ and 56.0 mg g−1 MoO42− ions from aqueous media. The principal mechanisms of sorption were determined, by scanning electron microscopy of the metal-laden CCF, to be co-precipitation with Ca2+ ions released from the cement to form solubility limiting phases. The removal of Co2+ and MoO42− ions followed a zero-order reaction and that of Cd2+ was best described by a pseudo-second-order model. The Langmuir model provided the most appropriate description of the steady state immobilisation of Cd2+ and Co2+, whereas the removal of MoO42− conformed to the Freundlich isotherm. Long equilibration times (>120 h), loose floc formation and high pH are likely to limit the use of CCF in many conventional wastewater treatment applications; although, these properties could be usefully exploited in reactive barriers for the management of contaminated soils, sediments and groundwater.

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