Adsorption studies on rice husk: removal and recovery of Cd(II) from wastewater

Ajmal, Mohammad; Rao, Rifaqat Ali Khan; Anwar, Shehwaz; Jamal, Anwar; Ahmad, Rais

doi:10.1016/s0960-8524(02)00159-1

Cited by 408 publications

(191 citation statements)

References 9 publications

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“…Optimum pH was found to be 6 for further experiments. At higher pH cadmium hydroxide starts precipitating from the solution, making actual adsorption studies impossible (Ajmal et al 2003). This result confirms the earlier report that the adsorption is pH-dependent (Pavasant et al 2006).…”

Section: Resultssupporting

confidence: 86%

“…There are several methods to treat the contaminated water; the selection of the treatment methods is based on the level of the waste and the cost of treatment (Ajmal et al 2003). Conventional methods for the removal of the heavy metal ions from wastewaters include chemical precipitation, electro flotation, ion exchange, reverse osmosis and adsorption onto activated carbon.…”

Section: Introductionmentioning

confidence: 99%

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Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Dubey¹,

Mishra²,

Singhal³

2013

Int. J. Environ. Sci. Technol.

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Heavy metals are a threat to human health and ecosystem. These days, great deal of attention is being given to green technologies for purification of water contaminated with heavy metal ions. Biosorption is one among such emerging technologies, which utilizes naturally occurring waste materials to sequester heavy metals from wastewater. Cadmium has hazardous impact on living beings; therefore, its removal through green and economical process is an important task. The aim of the present study was to utilize the locally available Portulaca oleracea plant biomass as an adsorbent for cadmium removal from aqueous solution. The biomass was obtained after drying and grinding the portulaca leaves and stem. No chemical treatment was done on the adsorbent so that it remained green in a true sense. Batch experiments were performed at room temperature. The critical parameters studied were effects of pH, contact time, initial metal ion concentration and adsorbent dose on the adsorption of cadmium. The maximum adsorption was found to be 72 %. The kinetic data were found to best fit the pseudo-secondorder equation. High adsorption rates were obtained in the initial 45 min, and adsorption equilibrium was then gradually achieved in about 100 min. Adsorption increased with increase in pH for a range 2 and 6. The equilibrium adsorption results closely followed both the Langmuir and Freundlich isotherms. The values of constants were calculated from isotherms. Results indicated that portulaca plant biomass could be developed as a potential material to be used in green water treatment devices for removal of metal ions.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Dubey¹,

Mishra²,

Singhal³

2013

Int. J. Environ. Sci. Technol.

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“…Various methods are available to isolate and remove heavy metals from the environment include precipitation, ion exchange, adsorption etc. but the selection of method is based on the concentration of metals and cost of treatment (Cheung et al 2001, Ajmal et al 2003. Adsorption is one of the easiest, safe and cost effective methods, being widely used in effluent water treatment processes (Devrim and Hayri 1992).…”

Section: Introductionmentioning

confidence: 99%

Removal of cadmium from aqueous solutions using excised leaves of Quetta pine (Pinus halepensis Mill.)

et al. 2015

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Removal of cadmium from aqueous solution was studied by using Quetta pine (Pinus halepensis Mill.) leaves. Batch adsorption experiments were performed as a function of appropriate equilibrium time, pH, concentration of adsorbate and amount of adsorbent. The optimum pH required for maximum adsorption was found to be 7.0 and the maximum contact time for the equilibrium was 30 minutes at adsorbent dose of 10 g. The maximum adsorption efficiency of cadmium removal was 98.50%. The results were better fitted by Langmuir than Freundlich isotherm. The separation factor of equilibrium 0.12 and 0.67 showed that Quetta pine leaves are good adsorbent of cadmium from aqueous solution.

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“…These include mungbean husk [5], hazelnut shell [6], almond shell [6], pine [7], lignin [8], tea leaves [9], tree ferm [10], groundnut husks [11], sphagnum moss peat [12], sawdust [13], rice hulls [14], chitosan [14], sugarcane bagasse [15], cocoa shell [16], and rice husk [17]. However, some major limitations of these biosorptions are that some of them have not yielded satisfactory results (high metal adsorption capacity) and others that yielded good results may not locally be available.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

Olu-Owolabi

Diagboya

Ebaddan

2012

Chemical Engineering Journal

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. a b s t r a c tBiosorption of lead (II) ions onto raw biomass of the moss plant Barbula lambarenensis has been studied using the batch equilibrium adsorption method. Equilibrium isotherms, kinetics and thermodynamic parameters have been evaluated. The FT-IR analysis showed that likely functional groups responsible for the adsorption are carboxyl, carbonyl, amides and hydroxyl groups. The pH for optimum adsorption is 5.0. Equilibrium data fit well to the Langmuir isotherm. The estimated maximum adsorption capacity was found to be 62.50 mg/g at 298 K and 90.91 mg/g at 323 K. The kinetic data obeyed the pseudo-second-order model. The free energy changes (DG o ) are positive and the reaction is exothermic with decreased randomness at the sorbent/solution interface. Taking into account its good adsorption capacity, ease of sample treatment, as well as availability, the biomass of B. lambarenensis is a promising cost-effective biosorbent for Pb 2+ removal from aqueous environment.

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Adsorption studies on rice husk: removal and recovery of Cd(II) from wastewater

Cited by 408 publications

References 9 publications

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Application of dried plant biomass as novel low-cost adsorbent for removal of cadmium from aqueous solution

Removal of cadmium from aqueous solutions using excised leaves of Quetta pine (Pinus halepensis Mill.)

Mechanism of Pb2+ removal from aqueous solution using a nonliving moss biomass

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