Metal Soprtion Enhancement of Rice Hull through Chemical Modification

Low, Kun She; Lee, C. K.; Wong, S. Y.; Tang, Peng

doi:10.1080/09593332108618152

Cited by 24 publications

(9 citation statements)

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“…20 %) gives it the structural strength as a sorbent without having to undergo cross-linking process [5]. The potential of rice hull in its natural state or after modification for the removal of positively charged metal ions from aqueous solution has been investigated [6][7][8]. Introduction of a positive centre via quaternization process resulted in a material with high sorption capacity for oxyanions such as As(V) and Cr(VI) [4,9].…”

Section: Introductionmentioning

confidence: 99%

Sorption of Cr(VI) and Cu(II) in aqueous solution by ethylenediamine modified rce hull

Tang¹,

Lee²,

Low³

et al. 2003

Environmental Technology

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The sorption characteristics of Cr(VI) and Cu(II) by ethylenediamine modified rice hull from single and binary metal ion solutions were evaluated under various experimental conditions. Optimal Cr(VI) and Cu(II) removal from single metal ion solutions occurred at pH 2.0 and 5.5, respectively. Simultaneous removal of Cr(VI) and Cu(II) occurred at pH greater than 3.0. The sorption kinetics of Cr(VI) and Cu(II) from single and binary metal ion solutions were studied with reference to metal concentration, agitation rate and particle size. Sorption of Cr(VI) was more rapid than Cu(II). The kinetics of metal ion sorption fitted a pseudo-second order expression. The variation in the initial uptake rates was very small at an agitation rate beyond 150 rpm and sorption was generally independent of particle size. Equilibrium sorption data could be fitted into the Langmuir isotherm equation. Maximum sorption capacities of ethylenediamine modified rice hull for Cr(VI) at pH 2 and Cu(II) at pH 4 in single metal solutions were 0.45 and 0.06 mmol g(-1), respectively. This corresponds to an enhancement factor of 2.6 and 3 fold for Cr(VI) and Cu(II), respectively, compared to natural rice hull. A synergistic effect was observed for sorption of these ions in binary metal solutions.

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Section: Introductionmentioning

confidence: 99%

Sorption of Cr(VI) and Cu(II) in aqueous solution by ethylenediamine modified rce hull

Tang¹,

Lee²,

Low³

et al. 2003

Environmental Technology

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“…Thus there has been a recent focus on agricultural and food industry wastes such as tea, coffee grounds and rice hull [2] as alternatives to synthetic ion-exchange resins or activated carbon for treating metal-containing waste streams. Tannincontaining materials such as exhausted coffee contain metal-binding polyhydroxy polyphenol functional groups [1] and are available in large quantities from the manufacture of instant coffee [3].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of heavy metals by exhausted coffee grounds as a potential treatment method for waste waters

Utomo

Hunter

2006

e-J. Surf. Sci. Nanotechnol.

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The adsorption of the heavy metal ions Cu 2+ , Zn 2+ , Cd 2+ and Pb 2+ from aqueous solution by used coffee grounds has been investigated as a potential low-cost treatment method for heavy metal-containing waste waters that is based on a readily available natural by-product. The results show that metal ion adsorption is efficient over a fairly wide pH range and adsorbed metals are reversibly leached from the exhausted coffee by dilute acid without significant loss of the adsorptive capacity for subsequent re-use.

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“…(2014) [1][2][3][4][5][6][7] www.deswater.com doi: 10.1080/19443994.2014.926460 and bamboo fibers [12] have all been used as adsorbents to remove Pb 2+ from aquatic solutions. The main component of all of these agricultural by-products is cellulose.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…Wood pulp [1,2], corncobs [3], rice husk ash [4], rice husk [5,6], sawdust [7,8], peanut hulls [9], tea leaves [10], grape stalks [11], *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of lead ions from aqueous solutions by citric acid-modified celluloses

Kuo

Chen

2014

Desalination and Water Treatment

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In this study, citric acid was utilized to modify the surface of cellulose and the citric acidmodified cellulose (CAMC) was then used to remove Pb 2+ from aquatic solutions. The surface characteristics of CAMC were determined by Fourier-transform infrared spectroscopy and zeta potential analyses. The exact effects of CAMC dosage, pH, and temperature on the adsorption of Pb 2+ by CAMC were determined. After 180 min of reaction, the adsorption percentages of Pb 2+ at 0.5, 1.5, and 2.5 g/L CAMC were 66, 87, and 94%, respectively. The Pb 2+ removal efficiency of CAMC increased with CAMC dosage, pH, and temperature. Experimental results reveal that the pseudo-second-order model best represents the adsorption kinetics. The Freundlich model fits the experimental isotherms better than does the Langmuir model. ΔH˚and ΔS˚were 43.34 kJ/mol and 224.4 J/mol K, respectively. The value of ΔH˚suggested that the Pb 2+ was adsorbed onto CAMC via physisorption.

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Metal Soprtion Enhancement of Rice Hull through Chemical Modification

Cited by 24 publications

References 0 publications

Sorption of Cr(VI) and Cu(II) in aqueous solution by ethylenediamine modified rce hull

Sorption of Cr(VI) and Cu(II) in aqueous solution by ethylenediamine modified rce hull

Adsorption of heavy metals by exhausted coffee grounds as a potential treatment method for waste waters

Adsorption of lead ions from aqueous solutions by citric acid-modified celluloses

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