Enhanced adsorption of sulfonamide antibiotics in water by modified biochar derived from bagasse

AbstractIn this study, biochars derived from bagasse were prepared and their ability for the adsorption of four kinds of sulfonamide antibiotics (sulfamethoxazol, thiazole, methylpyrimidine, dimethylpyrimidine) was investigated. Results showed that the modified biochar can efficiently adsorb sulfonamides in water. The biochar obtained at 500oC and modified with 30% hydrogen peroxide was chosen as the adsorbent. Under optimum conditions, pH 4 and 35°C, great adsorption performance was exhibited in the adsorption process of the four sulfonamide antibiotics. The productivity of the modified biochar was ~ 89% compared to un-modified biochar which is ~31%. The successful preparation of biochar from bagasse indicates that it is a good way to reuse the resources. Besides the adsorption of antibiotics, the obtained material also has a great prospect in the removal of other pollutants.

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Enhanced adsorption performance of tetracycline in aqueous solutions by methanol-modified biochar

Chemical Engineering Journal ◽

10.1016/j.cej.2014.03.006 ◽

2014 ◽

Vol 248 ◽

pp. 168-174 ◽

Cited By ~ 170

Author(s):

Xiang-Rong Jing ◽

Yuan-Ying Wang ◽

Wu-Jun Liu ◽

Yun-Kun Wang ◽

Hong Jiang

Keyword(s):

Aqueous Solutions ◽

Adsorption Performance ◽

Modified Biochar ◽

Enhanced Adsorption

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Enhanced Adsorption of Orange II Using Cationic Surfactant Modified Biochar Pyrolyzed from Cornstalk

Journal of Chemistry ◽

10.1155/2016/8457030 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 8

Author(s):

Xiao Mi ◽

Guoting Li ◽

Weiyong Zhu ◽

Lili Liu

Keyword(s):

Adsorption Process ◽

Orange Ii ◽

Order Kinetic ◽

Nonlinear Simulation ◽

Modified Biochar ◽

Order Kinetic Model ◽

Alkaline Conditions ◽

Pseudo Second Order ◽

Acidic Conditions ◽

Enhanced Adsorption

As dissolution of raw biomass is serious when used as an adsorbent, the cheap biochar pyrolyzed from biomass might be a good matrix. Raw cornstalk biochar was intentionally modified by cetyltrimethylammonium bromide (CTAB) to prepare the composite adsorbent designed for the removal of negatively charged pollutants. After modification, the removal efficiency for anionic dye Orange II (ORII) increased from 46.9% of the virgin cornstalk biochar to 99.7% of the CTAB-modified cornstalk biochar. The uptake of ORII proved to be favorable under acidic conditions but unfavorable under alkaline conditions. By nonlinear simulation, the Elovich model was the best to describe the adsorption kinetics. For linear simulation of the kinetic data, the pseudo-second-order kinetic model fitted the experimental points better than the pseudo-first-order model. Kinetic analysis indicated that the ORII adsorption process on the CTAB-modified cornstalk biochar might be chemical adsorption accompanied by ion exchange. At 298 K, the maximal adsorption capacity of the modified biochar is 26.9 mg/g by the Langmuir model. The adsorption of ORII increased with a rise in the reaction temperature. The enthalpy and entropy of the adsorption process are calculated to be 38.45 KJ mol−1and 185.0 J mol−1 K−1, respectively. The negative values ofΔG0at 288, 298, and 308 K were −14.92, −16.50, and −18.62 KJ mol−1, respectively. The above thermodynamic analysis demonstrates that the adsorption process was endothermic and spontaneous.

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Enhanced adsorption of ciprofloxacin by KOH modified biochar derived from potato stems and leaves

Water Science & Technology ◽

10.2166/wst.2017.636 ◽

2017 ◽

Vol 77 (4) ◽

pp. 1127-1136 ◽

Cited By ~ 18

Author(s):

Ruining Li ◽

Zhaowei Wang ◽

Jialei Guo ◽

Yan Li ◽

Hanyu Zhang ◽

...

Keyword(s):

Adsorption Process ◽

Nitrogen Adsorption ◽

Adsorption Mechanisms ◽

Modified Biochar ◽

Bonding Interaction ◽

Before And After ◽

Stems And Leaves ◽

Enhanced Adsorption ◽

Adsorption Desorption ◽

Kinetics And Isotherms

Abstract Potato stems and leaves biochar (PB) was prepared by pyrolysis at a temperature of 500°C under anoxic conditions. In order to strengthen the adsorption capacity, biochar was modified with alkaline solution (alkali modified biochar, APB). Two kinds of biochars were adopted as adsorbents to remove ciprofloxacin (CIP) from aqueous solution. The adsorption behavior of CIP onto biochar before and after alkali modified including adsorption kinetics and isotherms were investigated. The effects of different factors (equilibrium time, pH, temperature and initial concentration) during the adsorption process were also investigated. Biochar samples were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and nitrogen adsorption–desorption isotherm. The results showed that the alkali treated biochar possessed more mesopores than raw biochar, and accordingly exhibited a more excellent adsorption performance (23.36 mg·g−1) than raw biochar. Hydrophobic interaction, hydrogen-bonding interaction, electrostatic interaction, and π − π interaction were the adsorption mechanisms for CIP uptake onto the two adsorbents.

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Enhanced removal of NO3-N from water using Fe-Al modified biochar: behavior and mechanism

Water Science & Technology ◽

10.2166/wst.2020.033 ◽

2019 ◽

Vol 80 (10) ◽

pp. 2003-2012 ◽

Cited By ~ 1

Author(s):

Hanyang You ◽

Wenying Li ◽

Yi Zhang ◽

Zilin Meng ◽

Zhenxiao Shang ◽

...

Keyword(s):

Ligand Exchange ◽

Adsorption Process ◽

Maximum Adsorption Capacity ◽

Batch Experiments ◽

Order Model ◽

Freundlich Model ◽

Adsorption Mechanisms ◽

Adsorption Performance ◽

Modified Biochar ◽

N Removal

Abstract To remove NO3-N from water, coconut shell biochar (CSB) was modified by a solution of FeCl3, a solution of AlCl3 and a mixture solution of FeCl3 and AlCl3 respectively. The obtained modified biochar with the best effect of NO3-N adsorption was screened out to explore the adsorption behavior and mechanism of NO3-N removal by batch experiments and kinetics and thermodynamics and correlated characterization. The results indicated that the mixture solution of FeCl3- and AlCl3- modified CSB (Fe-Al/CSB) showed the best adsorption performance for NO3-N removal. Iron and aluminum elements existed on the surface of Fe-Al/CSB in the form of FeOOH, Fe2O3, Fe2+, and Al2O3 respectively. The adsorption process could reach equilibrium in 20 min. An acidic condition was favorable for NO3-N adsorption. The presence of coexisting anions was not conducive for NO3-N adsorption. The quasi-second-order model and Freundlich model could be well fitted in the adsorption process. The maximum adsorption capacity of Fe-Al/CSB fitted by the Langmuir model could reach 34.20 mg/g. The adsorption of NO3-N by Fe-Al/CSB was an endothermic and spontaneous process. Ligand exchange and chemical redox reaction were the NO3-N adsorption mechanisms which led to NO3-N adsorption by Fe-Al/CSB.

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Characterization of hydrogen peroxide (H2O2) modified hydrochars from walnut shell for enhanced adsorption performance of methylene blue from aqueous solution

10.5004/dwt.2018.21739 ◽

2018 ◽

Vol 109 ◽

pp. 221-230 ◽

Cited By ~ 3

Author(s):

Yang Huang ◽

Yan Huang ◽

Weiqing Wang ◽

Kui Zheng

Keyword(s):

Aqueous Solution ◽

Hydrogen Peroxide ◽

Methylene Blue ◽

Walnut Shell ◽

Adsorption Performance ◽

Enhanced Adsorption

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Thermodynamic, Kinetic and Isotherm Study of 4-chloro-2-methyl Phenoxy Acetic Acid (MCPA) by (PV/S-g-3D-GO/N) from Aquatic Solutions

10.21203/rs.3.rs-95697/v1 ◽

2020 ◽

Author(s):

Alireza Hajighasemkhan ◽

Elham Moniri ◽

Lobat Taghavi ◽

Homayon Ahmad Panahi ◽

Amir Hessam Hassani

Keyword(s):

Acetic Acid ◽

Removal Efficiency ◽

Adsorption Process ◽

Inlet Concentration ◽

Optimum Conditions ◽

Order Model ◽

Phenoxy Acetic Acid ◽

Isotherm Study ◽

Adsorption Performance ◽

Pseudo Second Order

Abstract BackgroundIn this study removal efficiency of 4-chloro-2-methyl-phenoxy acetic acid (MCPA) by 3D polymer nano-magnetic (PV/S-g-3D-GO/N) was investigated.MethodsThe effects of operation parameters including adsorbent mass, influent flow rate and inlet concentration on the adsorption performance are investigated.ResultsMaximum adsorption capacity (4.36 mg/g) was achieved at optimum conditions (pH: 3, contact time: 300 min, adsorbent dosage: 5 g/l and temperature: 50 °C). Moreover, adsorption isotherm and kinetics were agreed with the Langmuir model (R2 = 0.997) and pseudo-second-order model (R2 = 0.999), respectively. Thermodynamic studies also show that adsorption process was spontaneous (ΔG < 0) and endothermic (ΔH > 0).ConclusionAccording to removal efficiency (100%), this adsorbent is an excellent alternative for removal herbicide in high temperature industry.

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TREATABILITY OF 2,4-D PRODUCTION WASTEWATERS

Water Science & Technology ◽

10.2166/wst.1994.0067 ◽

1994 ◽

Vol 30 (3) ◽

pp. 73-78 ◽

Cited By ~ 3

Author(s):

O. Tünay ◽

S. Erden ◽

D. Orhon ◽

I. Kabdasli

Keyword(s):

Hydrogen Peroxide ◽

Activated Sludge ◽

Partial Oxidation ◽

Chloride Concentration ◽

Chemical Oxidation ◽

Cod Removal ◽

Optimum Conditions ◽

Organic Loading ◽

Activated Sludge System ◽

Biological Treatability

This study evaluates the characterization and treatability of 2,4-D production wastewaters. Wastewaters contain 20000-40000 mg/l COD, 17000-30000 mg/l chloride and pH is around 1.0. Chemical oxidation with hydrogen peroxide provided almost complete COD removal. The optimum conditions are 3:1 H2O2/COD oxidant dosage, 3000 mg/l Fe3+ as catalyst and pH 3. Partial oxidation at 0.5:1 H2O2//COD ratio is also effective providing 67% COD removal. A batch activated sludge system is used for biological treatability. Dilution is needed to maintain a tolerable chloride concentration which increases through COD removal. pH also increased during COD removal. 85% COD removal is obtained for the 50% dilution at an organic loading of 0.3 day‒1 on a COD basis. Completely and partially oxidized wastewaters are also treated in the activated sludge down to 30 mg/l BOD5.

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

Asian Journal of Chemistry ◽

10.14233/ajchem.2020.22278 ◽

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.

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Luteolin Imprinted Polymer with Selective Recognition and Adsorption Performance

Materials Science Forum ◽

10.4028/www.scientific.net/msf.809-810.297 ◽

2014 ◽

Vol 809-810 ◽

pp. 297-301

Author(s):

Ping Rui Meng ◽

Liang Bo Li

Keyword(s):

Adsorption Process ◽

Selective Adsorption ◽

Methanol Solution ◽

Selective Recognition ◽

Imprinted Polymer ◽

Molecular Imprinted Polymers ◽

Adsorption Dynamics ◽

Adsorption Performance ◽

Recognition Specificity ◽

Adsorption Amount

In order to selectively separate luteolin from its crude solution, we synthesized luteolin molecular imprinted polymers (LMIP) with high recognition specificity for luteolin, using an imprinting technique. Luteolin was used as template, methanol as solvent, and N,N’-methylenebisacrylamide (MBAA) as the cross-linking. Then prepared LMIP were characterized and evaluated by scanning electron microscope (SEM) and equilibrium absorption experiments. The results showed that the cavities matching with the template molecules in size and structure were present in the LMIP. Adsorption dynamics analysis suggested that, when the adsorption time reached 4 h, the adsorption process had reached balance and the adsorption capacity was at steady state. The selective adsorption amount reached at 35.65 umol/g for the LMIP, while a lower value of 11.68 umol/g for the blank polymer (i.e. nontemplated). Relative to the corresponding blank polymer, LMIP had an excellent recognition to luteolin in methanol solution. Keywords: Molecular imprinting, Molecular recognition, Adsorbent, Luteolin

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