Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study
In this study, readily available inexpensive water treatment sludge (WTS) was used to prepare adsorbent for the removal of Congo red (CR) and tetracycline (TC) from aqueous solutions. The structural characteristics and adsorption properties of WTS biochar were characterised via scanning electron mic...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-03-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/85/6/1936 |
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| author | Liwenze He Yu Chen Yanjun Li Fei Sun Yuting Zhao Shunsheng Yang |
| author_facet | Liwenze He Yu Chen Yanjun Li Fei Sun Yuting Zhao Shunsheng Yang |
| author_sort | Liwenze He |
| collection | DOAJ |
| description | In this study, readily available inexpensive water treatment sludge (WTS) was used to prepare adsorbent for the removal of Congo red (CR) and tetracycline (TC) from aqueous solutions. The structural characteristics and adsorption properties of WTS biochar were characterised via scanning electron microscope, energy dispersive X-ray spectroscopy, Brunauer-Emmett-Teller and Fourier Transform infrared spectroscopy. In batch experiments, the adsorption factors, kinetics, isothermal curves and thermodynamics of the adsorption properties were investigated. The optimum preparation condition of WTS biochar was 400 °C for 4 h under O2-limited pyrolysis, which exhibited increased specific surface area and pore structures. The best adsorption was observed when the pH of the CR and TC solutions was 7 and 4, respectively. The adsorption process followed the pseudo-second-order model, indicating that the main control step was the chemical adsorption process. Isotherm data were best described by the Langmuir model, and the maximum adsorption capacities for CR and TC were 116.4 and 58.5 mg·g−1, respectively. Thermodynamic parameters revealed that the adsorption process was spontaneous and endothermic. According to the analysis, the adsorption mechanism of CR could be attributed to electrostatic attraction, π–π conjugation and hydrogen bonding, whereas that of TC was potentially associated with cation exchange, complex precipitation, π–π conjugation and hydrogen bonding. HIGHLIGHTS
Synthetic dyes and antibiotics have been widely used and are difficult to biodegrade.;
In this study, water treatment sludge was prepared, and its adsorption properties of the dye and antibiotics were investigated.;
It is a promising adsorbent with stable and efficient adsorption capacity, low cost, environmental protection and safety.; |
| first_indexed | 2024-12-12T18:55:03Z |
| format | Article |
| id | doaj.art-157331dfa48745b5baf4282a165d0e3a |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-12-12T18:55:03Z |
| publishDate | 2022-03-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-157331dfa48745b5baf4282a165d0e3a2022-12-22T00:15:16ZengIWA PublishingWater Science and Technology0273-12231996-97322022-03-018561936195110.2166/wst.2022.085085Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic studyLiwenze He0Yu Chen1Yanjun Li2Fei Sun3Yuting Zhao4Shunsheng Yang5 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China In this study, readily available inexpensive water treatment sludge (WTS) was used to prepare adsorbent for the removal of Congo red (CR) and tetracycline (TC) from aqueous solutions. The structural characteristics and adsorption properties of WTS biochar were characterised via scanning electron microscope, energy dispersive X-ray spectroscopy, Brunauer-Emmett-Teller and Fourier Transform infrared spectroscopy. In batch experiments, the adsorption factors, kinetics, isothermal curves and thermodynamics of the adsorption properties were investigated. The optimum preparation condition of WTS biochar was 400 °C for 4 h under O2-limited pyrolysis, which exhibited increased specific surface area and pore structures. The best adsorption was observed when the pH of the CR and TC solutions was 7 and 4, respectively. The adsorption process followed the pseudo-second-order model, indicating that the main control step was the chemical adsorption process. Isotherm data were best described by the Langmuir model, and the maximum adsorption capacities for CR and TC were 116.4 and 58.5 mg·g−1, respectively. Thermodynamic parameters revealed that the adsorption process was spontaneous and endothermic. According to the analysis, the adsorption mechanism of CR could be attributed to electrostatic attraction, π–π conjugation and hydrogen bonding, whereas that of TC was potentially associated with cation exchange, complex precipitation, π–π conjugation and hydrogen bonding. HIGHLIGHTS Synthetic dyes and antibiotics have been widely used and are difficult to biodegrade.; In this study, water treatment sludge was prepared, and its adsorption properties of the dye and antibiotics were investigated.; It is a promising adsorbent with stable and efficient adsorption capacity, low cost, environmental protection and safety.;http://wst.iwaponline.com/content/85/6/1936adsorptioncongo redkineticstetracyclinethermodynamicswater treatment sludge |
| spellingShingle | Liwenze He Yu Chen Yanjun Li Fei Sun Yuting Zhao Shunsheng Yang Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study Water Science and Technology adsorption congo red kinetics tetracycline thermodynamics water treatment sludge |
| title | Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study |
| title_full | Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study |
| title_fullStr | Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study |
| title_full_unstemmed | Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study |
| title_short | Adsorption of Congo red and tetracycline onto water treatment sludge biochar: characterisation, kinetic, equilibrium and thermodynamic study |
| title_sort | adsorption of congo red and tetracycline onto water treatment sludge biochar characterisation kinetic equilibrium and thermodynamic study |
| topic | adsorption congo red kinetics tetracycline thermodynamics water treatment sludge |
| url | http://wst.iwaponline.com/content/85/6/1936 |
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