Adsorption of Cr(VI) on activated rice husk carbon and activated alumina

Bishnoi, Narsi R.; Bajaj, Mini; Sharma, Nupur; Gupta, Asha

doi:10.1016/s0960-8524(03)00204-9

Cited by 328 publications

(131 citation statements)

References 7 publications

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“…The average bulk density was 377.24 kg m -3 for the long grain rice husk, 331.59 kg m −3 for the short grain rice husk, 344.97 kg m −3 for the cascara de arroz rice husk and 380.54 kg m −3 for the japonica rice husk. These values are similar to the value of 348.8 kg m −3 reported by Velez et al (2009) for the rice husk from Colombia, the value of 353 kg m -3 reported by Bishnoi et al (2004) for the rice husk from India and are within the range of 100-400 kg m −3 reported by Sridhar et al (1996) for the rice husk from India. reported by Yuan et al (2012) for the rice straw from China and the value of 182 kg m −3 reported by Chiueh et al (2012) for the rice straw from Taiwan and lower than the value of 227 kg m −3 reported by Kadam et al (2000) for the rice straw from USA.…”

Section: Rice Huskssupporting

confidence: 88%

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Zhang

Ghaly

Li³

2012

American Journal of Applied Sciences

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Rice husk and straw are by-products of rice cultivation and processing industry and can be used as an energy source. Proper understanding of the physical properties of rice residues is necessary for utilizing them in thermochemical conversion processes such as gasification and combustion. The physical properties (moisture content, particle size, bulk density and porosity) of rice husks and straws obtained from three countries (Egypt, Cuba and China) were evaluated in this study. The moisture contents of rice husks and straws were in the ranges of 4.60-6.07% and 6.58-6.92%, respectively. For all rice varieties tested, the moisture content of the straws was higher than these of the husks. The particle sizes of rice husks and straws were in the ranges of 0.212-0.850 mm and 0-0.710 mm, respectively. All the rice husk varieties had a normal distribution of particle size around the main value of 0.6 mm while the particle size distribution for the rice straws showed a decreasing trend, the larger the particle size the higher was the weight percentage. The bulk density of rice husks and straws were in the ranges of 331.59-380.54 kg m -3 and 162. 03-194.48 kg m -3 , respectively. The bulk density values of rice straws were lower than those of rice husks. A negative linear relationship between the bulk density and the average particle size was observed for rice husks and straws. The porosity of rice husks and straws were in the ranges of 63.64-68.94% and 71.21-85.28%, respectively. A positive linear relationship between the porosity and the average particle size was observed for rice husks and straws. Also, a negative linear relationship between the porosity and the bulk density was observed. The results obtained from this study showed significant differences in the physical properties of the rice husks and straws collected from different countries (located in three different continents). These differences may be due to variations in climatic conditions, soil type, methods of cultivation and type of fertilizer used. The results also indicated that different parts of rice plant (straw and husk) had different physical properties. Also, significant differences were observed among rice varieties even though they were grown under the same climatic conditions using same soil type and cultivation method as in the case of the long and short grain rice variety of Egypt.

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Section: Rice Huskssupporting

confidence: 88%

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Zhang

Ghaly

Li³

2012

American Journal of Applied Sciences

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“…Previous studies on the removal of Cr(VI) using activated carbons produced from coconut shells [7], clays [8], wheat bran [9], rice husk [10], tyres and sawdust [11], etc. have been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Oyedoh

Ekwonu

2016

Acta Polytech

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Abstract. The adsorption of chromium(VI) metal ion in aqueous solutions by activated carbon resorcinol formaldehyde xerogels (ACRF) was investigated. The results showed that pore structure, surface area and the adsorbent surface chemistry are important factors in the control of the adsorption of chromium(VI) metal ions. The isotherm parameters were obtained from plots of the isotherms and from the application of Langmuir and Freundlich Isotherms. Based on regression analysis, the Langmuir isotherm model was the best fit. The maximum adsorption capacity of ACRF for chromium (VI) was 241.9 mg/g. The pseudo-second-order kinetic model was the best fit to the experimental data for the adsorption of chromium metal ions by activated carbon resorcinol formaldehyde xerogels. The thermodynamics of Cr(VI) ions adsorption onto ACRF was a spontaneous and endothermic process.

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“…Removal of dyes and their intermediates from effluents is a serious environmental issue as they are xenobiotic in nature and found to be recalcitrant to biodegradation (Garg et al, 2004;Imran et al, 2014). Problem becomes more complex with the presence of other contaminants like chromium (Cr) compounds in the wastewater along with azo dyes (Bishnoi et al, 2004;Mahmood et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of Chromium Forms on the Biodegradation of Reactive Black-5 Azo Dye by Psychrobacter and Klebsiella species

Khalid¹,

Arshad²,

Mahmood³

et al. 2015

IJAB

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To cite his paper: Khalid, A., J. Arshad, S. Mahmood, I. Aziz and M. Arshad, 2015 AbstractAzo dyes and chromium (Cr) are released in the wastewater of leather processing industry during tanning process. Several species of bacteria have shown ability to degrade azo dyes individually; however, presence of Cr ions in industrial effluents may affect the bacterial efficiency of removing azo dyes from waste water. In this study, biodegradation of reactive black-5 dye was studied in a mineral salts medium (MSM) liquid culture in the presence of Cr ions. Two bacterial strains Psychrobacter alimentarius KS23 and Klebsiella oxytoca N7 capable of degrading azo dyes were used individually as well as in a consortium for the degradation of azo dyes. Cr was applied in the form of K2Cr2O7, CrCl3, Cr2(SO4)3 at different concentrations (ranging from 0-250 mg L -1 ) of Cr. The results showed that presence of Cr in mineral salt medium significantly inhibited the azo dye decolorization. In the absence of Cr salts, complete decolorization of 100 mg dye L -1 was achieved by the bacterial strains in 8-12 h while up to 83% decolorization occurred in 72 h at 100 mg L -1 Cr. The rate of decolorization considerably decreased with increasing concentration of azo dye in the presence of 50 mg Cr L -1 medium. These findings imply that the existence of Cr in wastewater can significantly affect the bacterial efficiency in wastewater treatment systems to degrade azo dyes.

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Adsorption of Cr(VI) on activated rice husk carbon and activated alumina

Cited by 328 publications

References 7 publications

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Physical Properties of Rice Residues as Affected by Variety and Climatic and Cultivation Onditions in Three Continents

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Effect of Chromium Forms on the Biodegradation of Reactive Black-5 Azo Dye by Psychrobacter and Klebsiella species

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