Microporous activated carbon from Siris seed pods by microwave-induced KOH activation for metronidazole adsorption

Ahmed, Muthanna J.; Theydan, Samar K.

doi:10.1016/j.jaap.2012.10.019

Cited by 121 publications

(52 citation statements)

References 45 publications

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“…Finally, further enhancements in the iodine numbers of both the pinewood and wheat straw activated carbons are achieved (Foo and Hammed 2012a). A similar conclusion was reported by Ahmed and Theydan (2013), who investigated the effect of increasing the KOH/char ratio from 0.4 to 1 on siris seedpods after activation for 8 min at 620 W. The authors' results indicated that the increase in the KOH/char ratio led to an increase in the iodine number from 1332 to 1760 mg/g. Fig.…”

Section: Effect Of the Koh/char Ratiosupporting

confidence: 75%

“…To avoid this situation and provide a rapid technique for improving the processing of agricultural wastes (such as woodchips and wheat straw), agricultural residues are currently being considered as promising precursors on account of their low cost, large surface area, extensive microporous structures due to their high concentrations of volatile matter and lignocellulosic material, and their renewable nature (Ahmed and Theydan 2013).…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Pinewood- and Wheat Straw-based Activated Carbon via a Microwave-assisted Potassium Hydroxide Treatment and an Analysis of the Effects of the Microwave Activation Conditions

Mao¹,

Zhou²,

Hashisho³

et al. 2014

BioResources

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This study explored the effect of activated carbon preparation conditions on their adsorption performance. Pinewood and wheat straw were used as source materials to prepare activated carbon via a fast activation process using KOH and microwave heating. The iodine numbers and carbon yields were determined to evaluate the adsorption properties of the activated carbon. The effects of various KOH/char mass ratios, particle sizes, humidity levels, and microwave heating times on the physical characteristics of the activated carbon were investigated. The iodine number and yield and SEM images were used to characterize the activated carbon. Small particle sizes, the presence of humidity in the purge gas, and high KOH/char ratios resulted in higher iodine numbers. The best activated carbons were obtained using a KOH/char ratio of 3.0, a microwave power of 600 W, a radiation time of 30 min, and a particle size of 0.1 to 0.42 mm in a humid environment; these carbons showed iodine numbers of 2208 mg/g (pinewood activated carbon) and 1420 mg/g (wheat straw activated carbon), with carbon yields of 73% and 52%, respectively. Longer microwave heating times increased the iodine number. The iodine numbers and yields of the pinewood activated carbons were much higher than those of their wheat straw counterparts.

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Section: Effect Of the Koh/char Ratiosupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Preparation of Pinewood- and Wheat Straw-based Activated Carbon via a Microwave-assisted Potassium Hydroxide Treatment and an Analysis of the Effects of the Microwave Activation Conditions

Mao¹,

Zhou²,

Hashisho³

et al. 2014

BioResources

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“…The removal of such pollutants are therefore of paramount importance. Several separation technologies, e.g., adsorption, photo-degradation, ozonation, and biological methods etc., have been suggested for the removal of nitroimidazoles from aqueous solutions [10][11][12][13][14][15][16][17][18][19][20][21][22]. However, the choice of the most suitable technology depends upon its cost-effectiveness for large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

“…For the removal of nitroimidazoles, the activated carbon-based adsorbents have mostly been investigated. For example, Ahmed and Theydan [10,11] prepared different kinds of activated carbon samples using Siris seed pods, for the adsorption of metronidazole. Activated carbon produced by microwave-induced KOH activation yielded the best results, with an adsorption capacity of 196.31 mg/g.…”

Section: Introductionmentioning

confidence: 99%

“…The rate constant at 303 K was found to be 0.0039, 0.0013, and 0.0011 g/(mg min), for 20, 60, and 100 mg/g of initial metronidazole concentration, respectively. It took as long as 180 min for the equilibrium to be established [10,11]. On the other hand, the use of activated carbon cloth by Orellana-Garcia et al [12] yielded a higher uptake of the nitroimidazoles (500 mg/g for MNZ and 600 mg/g for DMZ).…”

Section: Introductionmentioning

confidence: 99%

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Microwave-Assisted Synthesis of SiC Nanoparticles for the Efficient Adsorptive Removal of Nitroimidazole Antibiotics from Aqueous Solution

et al. 2017

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Abstract:Environmental pollution caused by the improper disposal of pharmaceuticals is a matter of global concern, and warrants immediate attention. Of particular concern is the aquatic contamination caused by the increasing use of antibiotics, which could give rise to superbugs. While researchers have mainly focused on improving the adsorption capacity of mostly activated carbon-based adsorbents, we have developed a non-conventional adsorbent (SiC nanoparticles) in the present work for the adsorptive removal of four different nitroimidazole antibiotics, namely metronidazole (MNZ), dimetridazole (DMZ), ronidazole (RNZ), and tinidazole (TNZ). In addition to the unique properties which are inherent to SiC, the present adsorbent not only possesses a high adsorption capacity, but also shows one of the highest adsorption rates; both of which are prerequisites for an efficient and cost-effective adsorption-based separation technology. Silicon carbide (SiC) nanoparticles, synthesized by a microwave-assisted method, were thoroughly characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and the Brunauer-Emmett-Teller method. The adsorption isotherm data were accurately described by the Langmuir isotherm model. On the other hand, the adsorption kinetics, closely represented by the pseudo-second order kinetic model, were faster than most previously reported adsorbents. The reaction rate constants were 0.0089, 0.0079, 0.0072, and 0.0055 g/(mg min), for MNZ, DMZ, RNZ, and TNZ, respectively.

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Study on Preparation of Activated Carbon from Hawaii Nut Shell via Steam Physical Activation

Lan¹,

Guo²,

Xia³

et al. 2016

7th International Symposium on High‐Temperature Metallurgical Processing

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Microporous activated carbon from Siris seed pods by microwave-induced KOH activation for metronidazole adsorption

Cited by 121 publications

References 45 publications

Preparation of Pinewood- and Wheat Straw-based Activated Carbon via a Microwave-assisted Potassium Hydroxide Treatment and an Analysis of the Effects of the Microwave Activation Conditions

Preparation of Pinewood- and Wheat Straw-based Activated Carbon via a Microwave-assisted Potassium Hydroxide Treatment and an Analysis of the Effects of the Microwave Activation Conditions

Microwave-Assisted Synthesis of SiC Nanoparticles for the Efficient Adsorptive Removal of Nitroimidazole Antibiotics from Aqueous Solution

Study on Preparation of Activated Carbon from Hawaii Nut Shell via Steam Physical Activation

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