Dye adsorption of mesoporous activated carbons produced from NaOH-pretreated rice husks

Lin, Long; Zhai, Shangru; Xiao, Zuoyi; Song, Yu; An, Qingda; Song, Xiaowei

doi:10.1016/j.biortech.2013.03.048

Cited by 198 publications

(67 citation statements)

References 31 publications

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“…This kinetic study confirmed that biosorption of AO7 on dried Rice Stem was a multi step process, involving in biosorption on the external surface and diffusion into the interior with external surface chemical sorption being the rate-IJHS 2014; 2(1): 60 controlling step (9,37). Based on the results, the dried Rice Stem can be used as an effective and low cost adsorbent to treat effluent containing dye.…”

Section: Ijhs 2014; 2(1): 59supporting

confidence: 65%

Removal of Acid Orang 7(AO7) Dye from Aqueous Solution by Using of Adsorption on to Rice Stem Waste: Kinetic and Equilibrium Study

Tilaki¹,

Balarak

Ghasemi

2014

Iran J Health Sci

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Background and purpose: dye is widely used in industries such as cosmetic, leather, paper and textile and release to the environment via their effluents. The purpose of this study was to compare the efficiency of low-cost adsorbents in acid orang 7 dyes removal from water. Materials and Methods:The Rice Stem biomass was sun dried, crushed and sieved to particle sizes in range of 1-2 mm. Then treated with 2.0 mol/L nitric acid for a period of 1 h followed by washing with distilled water and finally washed Stem was dried at 105• in oven. The residues concentration of acid orang 7 dyes was measured by spectrophotometer in λmax of 452 nm. The effect of pH, contact time and initial AO7 dye concentration, kinetic and isotherm models were studied. Then data interpreted and analyzed by Excel 16 software. Results:The pH value of 3, contact time of 75 min, adsorbent dosage of 8 g/L and dye concentration were 10 mg/l determined as optimum conditions for adsorbents. The most acid orang 7 dyes removal efficiency of 98% was obtained for modified Rice Stem in optimum conditions. The equilibrium data is best fitted on Langmuir isotherm and the adsorption kinetic model follows pseudo-second model.Conclusion: Based on data obtained in this study, it can be concluded that adsorption by modified Rice Stem is an efficient and reliable adsorbent for acid orang 7 dyes removal from liquid solutions.

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Section: Ijhs 2014; 2(1): 59supporting

confidence: 65%

Removal of Acid Orang 7(AO7) Dye from Aqueous Solution by Using of Adsorption on to Rice Stem Waste: Kinetic and Equilibrium Study

Tilaki¹,

Balarak

Ghasemi

2014

Iran J Health Sci

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“…The maximum adsorption capacities of MB onto Fe 3 O 4 /mSiO 2 -C 18 sorbent obtained from Langmuir equation at 25°C, 35°C and 45°C are 363.64 mg g À1 , 287.35 mg g À1 and 213.68 mg g À1 , respectively, with the adsorption equilibrium constants of 0.256 L mg À1 , 0.131 L mg À1 , and 0.127 L mg À1 . These values are superior to or comparable with those in most of the related works reported previously [10,22,30,[42][43][44][45][46] except for the porous magnetic carbon sheet [47] (Table S1). The Freundlich adsorption intensity parameters are higher than 1.5, also demonstrating the strong adsorption trend of MB onto the sorbent.…”

Section: Adsorption Isotherm Analysis and Thermodynamic Parameterssupporting

confidence: 64%

“…S7(a). Since the hydrophobic interaction between the C 18 groups and the organic dye molecules is the principal contributor for the adsorption, decreased adsorption capacity of MB on the Fe 3 O 4 /mSiO 2 -C 18 sorbent was observed at lower pH due to the weakened hydrophobic property of the cationic MB at lower pH [42]. However, the influence of solution pH on the adsorption of MB is insignificant in the pH range of 4.5-9.5 because the change of hydrophobic property of MB molecule in this pH range is unconspicuous.…”

Section: Effect Of Solution Ph and Ionic Strengthmentioning

confidence: 99%

“…6) indicates that about 95% of MB adsorption happened during the first 10 min and the adsorption reached equilibrium after 20 min. The kinetics curve of MB adsorption was fitted using the pseudo-second-order model to describe the adsorption behavior quantitatively and calculate the kinetic parameters [42].…”

Section: Adsorption Kinetic Of Mb Onto Fe 3 O 4 /Msio 2 -C 18 Mnpsmentioning

confidence: 99%

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One-pot synthesis of C18-functionalized core–shell magnetic mesoporous silica composite as efficient sorbent for organic dye

Zhang

Zeng

Wang

et al. 2015

Journal of Colloid and Interface Science

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a b s t r a c tIn this work, a facile one-pot strategy was proposed for the synthesis of C 18 -functionalized core-shell magnetic mesoporous silica composite (Fe 3 O 4 /mSiO 2 -C 18 ). The Fe 3 O 4 /mSiO 2 -C 18 composite, with an average size of 80 nm and a functionalized mesoporous silica shell of about 30 nm in thickness, has excellent adsorption ability toward methylene blue dye (MB) due to the large surface area (303 m 2 g À1 ) and the abundant hydrophobic C 18 groups. The adsorption equilibrium was achieved within 20 min and the adsorption behavior of MB on Fe 3 O 4 /mSiO 2 -C 18 composite fitted the pseudo-second-order kinetic model well (k 2 = 1.29 Â 10 À2 g mg À1 min À1 , q e = 144.72 mg g À1 , h o = 270.27 mg g À1 min À1 under 25°C and an initial MB concentration of 10 mg L À1 ). Langmuir and Freundlich isothermal adsorption models can both be used to describe the adsorption process and the maximum Langmuir adsorption capacity of MB on Fe 3 O 4 /mSiO 2 -C 18 at 25°C and pH 7.5 is 363.64 mg g À1 . Thermodynamic parameters show that the adsorption reaction is exothermic and spontaneous (DH 0 = À63.49 kJ mol À1 , DG 0 = À7.80 kJ mol À1 ). Ionic strength and pH affected the adsorption slightly. In addition, the MB adsorbed sorbent can be readily separated from water solution by an external magnet because of the high magnetic saturation value (22.62 emu g À1 ). After being regenerated by treatment with acidic methanol, the sorbent could be reused for at least 5 cycles with a little decrease in adsorption capacity.

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“…In the modem activated carbon industry, advocating environment protection and energy saving, phosphoric acid activated has been paid more attention with low energy, simple operation and less pollution [3][4].In this experiment,active carbon was prepared from rice husk, which was treated with phosphoric acid. The effects of such factors as the ratio of phosphate to rice husks, the activating temperature and time, heating rate and different activation process upon the adsorption properties of active carbon were investigated.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Rice Husk-based Activated Carbon Using Phosphoric Acid as Activator

Chen¹,

Fang²,

Zhu³

et al. 2016

Advances in Computer Science Research

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Dye adsorption of mesoporous activated carbons produced from NaOH-pretreated rice husks

Cited by 198 publications

References 31 publications

Removal of Acid Orang 7(AO7) Dye from Aqueous Solution by Using of Adsorption on to Rice Stem Waste: Kinetic and Equilibrium Study

Removal of Acid Orang 7(AO7) Dye from Aqueous Solution by Using of Adsorption on to Rice Stem Waste: Kinetic and Equilibrium Study

One-pot synthesis of C18-functionalized core–shell magnetic mesoporous silica composite as efficient sorbent for organic dye

Preparation and Properties of Rice Husk-based Activated Carbon Using Phosphoric Acid as Activator

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