Enhanced metal adsorption by soybean hulls modified with citric acid

Marshall, Wayne E.; Wartelle, Lynda H.; Boler, D.E; Johns, Mitchell M.; Toles, Christopher A.

doi:10.1016/s0960-8524(98)00185-0

Cited by 218 publications

(131 citation statements)

References 11 publications

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“…Another portion of NTSBP was exposed to air blowing for 6 h in order to remove excess humidity. Then, NTSBP was subjected to a citric acid esterification procedure the condition of which is an optimal of the study conducted by Marshall et al 1999. For this purpose NTSBP was mixed with a 0.6 M citric acid in a ratio of 1.0 g material to 7.0 ml citric acid solution.…”

Section: Methodsmentioning

confidence: 99%

“…at mildly elevated temperatures enhance their sorption capacity for metal ions and basic dyes (Lehrfeld 1997;Wafwoyo et al 1999;Marshall et al 1999Marshall et al , 2000Vaughan et al 2001;Wong et al 2003;Altundogan et al 2007;Gong et al 2006Gong et al , 2007Gong et al , 2008. It has been reported that an estimated production cost for citric acid-modified soybean hull is $1.17/kg versus typical retail costs $4-40/kg for commercial, petroleum-based cation exchange resins when purchased in bulk quantities .…”

Section: Introductionmentioning

confidence: 99%

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A study on cations and color removal from thin sugar juice by modified sugar beet pulp

Arslanoğlu

Tümen

2011

J Food Sci Technol

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This article describes the use of citric acid modified sugar beet pulp as new ion-exchanger sorbent for the removal of metal cations and colorants from thin juice. The results of batch adsorption runs concerning the effects of contact time, material dosage, temperature and pH drop were presented and discussed. Experimental data on the removal of metal cations showed that the sorption process was rapid and reached equilibrium in 60 min. Modified material in acidic form caused to a significant pH drop in thin juice, which could result with sucrose inversion. Uptake of metal cations increased with temperature whereas that of color decreased. Neutralised type modified product gave more satisfying results. After six successive contacts, 49.7%, 37.5% and 43.7% removals for Ca-Mg, K and color, respectively, were obtained by using neutralised form of modified sugar beet pulp.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study on cations and color removal from thin sugar juice by modified sugar beet pulp

Arslanoğlu

Tümen

2011

J Food Sci Technol

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“…Kinetics of adsorption follows Lagergren first order kinetic model with film diffusion being the constitutive rate-controlling step. The monolayer adsorption capacity obtained from Langmuir isotherms for DR-23 was relatively higher for the citric acid [6] treated rice husk compared to that obtained without chemical treatment. Consequently, safety can point to the use of this natural material due to abundance and very cheap biomass.…”

Section: Resultsmentioning

confidence: 79%

Colour Removal of Direct Red Dye Effluent by Adsorption Process Using Rice Husk

Sivakumar¹,

Thirumarimurugan²,

Xavier³

et al. 2012

IJBBB

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Abstract-To show that rice husk could be employed as low-cost and effective adsorbent for the removal of direct red 23 from dye effluent and also to study the effect of concentration of dye solution and the effect of amount of adsorbent on the percentage removal of dye. Azo dyes and their degradation products such as aromatic amines are highly carcinogenic. Adsorption of dyes is a new technology for treatment of waste water containing different types of dyes. Adsorption process is adopted for removal of direct red 23 dye from the dye effluent using rice husk as the adsorbent in treated and untreated form. The process involves: washing and drying of rice husk at 105°C, followed by soaking in 0.6 M citric acid for 2 hours and heated to 120 °C. Further it is dried and washed repeatedly to obtain treated rice husk. This treated and untreated rice husk are used for removal of direct red 23 dyes. Dye solutions of different concentrations were prepared and a known amount of adsorbent were added to study the Effect of concentration of dye solution and effect of amount of adsorbent on the percentage of removal of direct red 23.Index Terms-Direct red dye, rice husk, adsorption, effluent treatment, microporous. I. INTRODUCTIONAzo dyes and their degradation products such as aromatic amines are highly carcinogenic [9]. Adsorption of dyes is a new technology for treatment of wastewater containing different types of dyes [7]. The goal of this research is to develop a new and efficient adsorbent of direct dyes. Thus, rice husk, a commonly available agriculture waste, was investigated as viable materials for treatment of synthetic Direct F. Scarlet (Direct Red 23) containing industrial wastewater. Rice husk has many advantages such as its granular structure, chemical stability and its local availability at very low cost and there is no need to regenerate them due to their low production costs. The main constituents of rice husk are: 64-74% volatile matter and 12-16% fixed carbon and 15-20% ash [1]. Hence rice husk can be used as an effective adsorbent. Proper treatment of the dye plant effluent is thus, a matter of concern before discharge. This led to an intensive search for the best available technology, which can be used for the removal and remediation of dyes. In addition, it makes the treatment of industrial effluent to be an important target for industry and environment protection. Different treatment methods are described in the literature, including filtration, flocculation, chemical precipitation, ion exchange, membrane Manuscript received July 17, 2012; revised October 23, 2012. The authors are with the Department of Chemical Engineering, Coimbatore Institute of Technology, Coimbatore, thirumarimurugan@gmail.com, as.sabhari@ gmail.com, tkannadasan56@yahoo.com, merlyxavier10@gmail.com).separation, and adsorption [11]. Practically, dye removal process requires the following potential advantages for the adsorbent: 1) a large accessible pore volume, 2) hydrophobicity, 3) high thermal and hydrothermal stability, 4) no cata...

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“…For single metallic solutions, it is clear that the metal-binding properties of treated-biomass samples increase with both the citric acid concentration and the temperature of thermal treatment. During the chemical treatment, the citric acid when heated will dehydrate to yield a reactive anhydride and this anhydride can react with the biomass introducing acidic groups on the surface of BC endocarp (Wing 1996;Marshall et al 1999;Altun and Pehlivan 2012;LeyvaRamos et al 2012). Therefore, the metal uptakes of treated-BC samples are enhanced if a higher citric acid concentration is used.…”

Section: Resultsmentioning

confidence: 99%

“…Chemical modification of BC biomass using citric acid A chemical modification treatment was used to improve the sorption properties of BC endocarp samples. In particular, the methodology used in this study was performed according to the procedures reported by Marshall et al (1999) and Leyva-Ramos et al (2012). Figure 2 shows the main steps of this chemical treatment.…”

Section: Bc Biomass Descriptionmentioning

confidence: 99%

Chemical modification of Byrsonima crassifolia with citric acid for the competitive sorption of heavy metals from water

Monroy

Mendoza-Castillo

Bonilla-Petriciolet

et al. 2014

Int. J. Environ. Sci. Technol.

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This study reports the chemical modification of the Byrsonima crassifolia biomass with citric acid to improve its sorption properties for the removal of cadmium and nickel ions from aqueous solutions under competitive sorption conditions (i.e., multicomponent solutions). The best operating conditions of the chemical modification process were identified using the signal-to-noise ratio to enhance the metal uptakes and to reduce the competitive sorption effects during the simultaneous removal of these metals using the modified biomass. Results indicated that both the sorption capacity and selectivity for heavy metal removal can be improved in multicomponent metal solutions. This improvement in sorption properties of B. crassifolia biomass is mainly related to an increment of the acidic functional groups on the biomass surface caused by the chemical reaction between citric acid and this lignocellulosic material. The methodology reported in this study can be used to increase the sorption properties of other biomasses for the effective removal of toxic pollutants from multicomponent solutions and for the synthesis of sorbents with tailored sorption properties.

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Enhanced metal adsorption by soybean hulls modified with citric acid

Cited by 218 publications

References 11 publications

A study on cations and color removal from thin sugar juice by modified sugar beet pulp

A study on cations and color removal from thin sugar juice by modified sugar beet pulp

Colour Removal of Direct Red Dye Effluent by Adsorption Process Using Rice Husk

Chemical modification of Byrsonima crassifolia with citric acid for the competitive sorption of heavy metals from water

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