Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 1, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2020.104911
Keywords
Activated carbon; Syagrus romanzoffiana; Queen palm; 2,4-D, adsorption
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The activated carbon prepared from queen palm endocarp showed a high adsorptive performance for the herbicide 2,4-D. It exhibited a high specific surface area and pore volume, influencing the adsorption process significantly. The thermodynamic study indicated that the operation was spontaneous and involved an endothermic process.
In this work, an activated carbon sample with a high adsorptive performance for the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) was prepared from queen palm endocarp (Syagrus romanzoffiana) by pyrolysis process. The activated carbon presented an XRD pattern related to carbon graphite and functional groups such as C-H, C=O, O-H. The material particles presented a highly-porous structure, being beneficial to the adsorption process. The activated carbon showed a remarkable specific surface area of 782 m(2) g(-1) and pore volume of 0.441 cm(3) g(-1). The solution pH presented a strong influence on the adsorption process, with ideal pH = 2, being the best adsorbent dosage, 0.5 g L-1. The correspondent removal percentage was 95.4%. The pseudo-second-order model represented kinetic data, presenting R-2 > 0.992 and MSR< 19.62 (mg g(-1))(2). The Langmuir model was the most suitable for describing the equilibrium data with the highest R-2 (> 0.997) and lowest values of MSR (< 92.04 (mg g(-1))(2)), indicating a maximum capacity of 367.77 mg g(-1). The thermodynamic study indicated a spontaneous operation, with Delta G(0) ranging from -23.2 to 32.6 kJ mol(-1) and endothermic process (Delta H-0 = 67.30 kJ mol(-1)), involving physical interactions in the adsorbent/adsorbate system. The adsorbent could be regenerated by NaOH and used 7 times with the same adsorption capacity. Hence, overall, the activated carbon prepared from the Jeriva endocarp corresponds to a promising adsorbent in removing 2,4-D herbicide in wastewater.
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