Adsorption behavior of methylene blue on acid-treated rubber (Hevea brasiliensis) leaf

被引:34
|
作者
Jawad, Ali H. [1 ]
Mallah, Shaimaa Hassan [2 ]
Mastuli, Mohd Sufri [1 ]
机构
[1] Univ Teknol MARA, Fac Appl Sci, Shah Alam 40450, Selangor, Malaysia
[2] ALMuthanna Univ, Dept Chem, Coll Sci, Samawah, Iraq
关键词
Rubber leaf; Acid-treated; Chemical activation; Sulphuric acid; Adsorption; Methylene blue; ACTIVATED CARBON PREPARATION; AQUEOUS-SOLUTION; CHEMICAL ACTIVATION; DYE; REMOVAL; WASTE; EQUILIBRIUM; LIGNIN; KOH; OPTIMIZATION;
D O I
10.5004/dwt.2018.22915
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The rubber (Hevea brasiliensis) leaf is an agricultural waste was chemically treated with H2SO4 to be a potential biochar adsorbent for methylene blue (MB) adsorption from aqueous solution. The acid-treated rubber leaf (ATRL) was characterized by a CHNS-O, Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope with an energy dispersive X-ray spectrometer (SEM-EDX), point-of-zero charge (pH(pzc)) and proximate analyses. Batch mode adsorption studies were conducted by varying operational parameters such as adsorbent dosage (0.02-0.30 g), solution pH (3-11), initial MB concentrations (50-300 mg/L) and contact time (0-1440 min). The equilibrium data were well fitted to Freundlich isotherm compare to Langmuir and Temkin isotherms. The maximum adsorption capacity, q(max) of ATRL for MB adsorption was 263.2 mg/g at 303 K. The kinetic uptake profiles were well described by the pseudo-second-order model. The thermodynamic adsorption parameters such as standard enthalpy (Delta H degrees), standard entropy (Delta S degrees), and standard free energy (Delta G degrees) showed that the adsorption of MB onto ATRL surface endothermic in nature and spontaneous under the experimented conditions. All results mentioned above revealed that the ATRL can be feasibly utilized for the removal of MB from aqueous solution.
引用
收藏
页码:297 / 307
页数:11
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