Removal of cadmium ions with olive stones: the effect of somes parameters

Blázquez, G.; Hernáinz, F.; Calero, M.; Ruiz-Núñez, L.F.

doi:10.1016/j.procbio.2004.11.007

Cited by 123 publications

(72 citation statements)

References 12 publications

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“…With increasing the pH value, the deprotonation of functional groups provided the chance to co-ordinate with lead ions resulting in higher removal rate. While at pH higher than 5.0, the decreasing trend was caused by the formation of soluble hydroxyl complexes [20,21]. Therefore, all the other experiments in this study were carried out at optimum initial pH 5.0 so as to achieve maximum lead removal capacity.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass

Liu

Zhang

2009

Journal of Hazardous Materials

624

228

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a b s t r a c tHydrothermal conversion of biomass into biofuel could produce a special type of biochar as byproduct. This biochar is quite different from biochar derived from high temperature pyrolysis. In the present study, two biochars, prepared from hydrothermal liquefaction of pinewood (P300) and rice husk (R300), were characterized and investigated for lead removal from aqueous solution. The results indicated that the biochars contained a large amount of oxygen-containing groups on the surface, which were quite effective for lead removal with capacities of 4.25 and 2.40 mg/g for P300 and R300, respectively. The adsorption equilibrium was achieved around 5 h. Higher temperature favored the removal capacity implying that the adsorption was an endothermic process. The adsorption data at optimum solution pH 5 could be well described by Langmuir model and the adsorption process was well fitted by pseudo-second-order model. Moreover, it was found that the adsorption was mainly controlled by film diffusion. Thermodynamics analysis suggested that lead adsorption onto the biochars was physical endothermic process.

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Section: Effect Of Solution Phmentioning

confidence: 99%

Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass

Liu

Zhang

2009

Journal of Hazardous Materials

624

228

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“…Eventually the uptake of metal ions is limited by the occupied binding sites and results in a plateau. It showed that the active sites of the adsorbent remaining constant, the adsorption are independent of the concentration of metal ions at high concentration of metal ions [27] [28]. The maximum adsorption capacities from the experimental results are 91.68 and 71.2 mg/g for Pb(II) and Cu(II), respectively.…”

Section: Adsorption Isothermmentioning

confidence: 92%

Adsorptive Removal of Heavy Metals from Aqueous Solution with Environmental Friendly Material—Exhausted Tea Leaves

Shrestha¹,

Kour²,

Ghimire³

2016

ACES

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In this study adsorptive removal of Pb(II) and Cu(II) from aqueous solution by using environmental friendly natural polymers present in exhausted tea leaves has been studied. The biosorbent was modified with dimethylamine to introduce N-functional groups on the surface of adsorbent. The modified adsorbent was characterized by elemental analysis, zeta potential analysis, SEM, DRFTIR, XRD and TG/DTA analysis to conform the modification. Adsorption capacity of the adsorbent was determined as the function of pH of the solution, initial concentration of the solution and contact time. The adsorption experiments were performed using batch experiments. The maximum adsorption capacities of the adsorbent were found to be 91.68 and 71.20 mg/g for Pb(II) and Cu(II), respectively. To minimize the process cost, regeneration of the biosorbent and recovery of metal ions was explored by desorption study. The results indicate that the adsorbent holds great potential for the sequestration of Pb(II) and Cu(II) from their aqueous solution. Hence the modified exhausted tea leaves (MTL) have been investigated as a new cost effective and efficient biosorbent for removal of Pb(II) and Cu(II) from their aqueous solution.

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“…24,25 Na 16,20,26,27 A baixa disponibilidade dos íons metálicos em valores altos de pH é, sobretudo, devida à formação de complexos de hidróxidos solúveis. 28 Isso geralmente conduz a um erro de interpretação por parte de alguns autores, os quais associam a eficiência da remoção do íon metálico da solução aquosa ao processo de adsorção.…”

Section: Efeito Do Phunclassified

Remoção de metais de solução aquosa usando bagaço de caju

Moreira¹,

Sousa²,

Oliveira³

et al. 2009

Quím. Nova

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Recebido em 6/6/08; aceito em 5/3/09; publicado na web em 10/8/09 METAL REMOVAL FROM AQUEOUS SOLUTION USING CASHEW BAGASSE. The metal ions removal on cashew bagasse, a low-cost material, has been studied by batch adsorption. The parameters chemical treatment, particle size, biosorbent concentration, and initial pH were studied. In this study the maximum ions removal was obtained on the cashew bagasse treated with 0.1 mol/L NaOH/3 h, at optimum particle size (20-59 mesh), biosorbent concentration (50 g/L) and initial solution pH 5. The kinetic study indicated that the adsorption metal follows pseudo-second order model for a multielementary system and equilibrium time was achieved in 60 min for all metal ions.Keywords: adsorption; heavy metals; bagasse of cashew. INTRODUÇÃOAs principais fontes de poluição por metais pesados são provenientes dos efluentes industriais, de mineração e das lavouras. 1Estes metais quando lançados sem tratamento prévio são altamente móveis no meio ambiente e bioacumulativos na cadeia alimentar.2,3 A presença destes íons metálicos em excesso nos corpos d'água é uma ameaça potencial à saúde pública, à fauna e à flora, pois muitos são conhecidos pela natureza carcinogênica e tóxica. 4,5 Uma alternativa bastante utilizada na remoção de metais pesados de águas residuais de processos industriais (galvanoplásticos, metalúrgicos etc.) envolve os métodos convencionais de tratamento físico-químico: coagulação, floculação, sedimentação e filtração. Entretanto, estes métodos são bastante onerosos e envolvem longos períodos de detenção, o que dificulta a aplicabilidade. 6,7 Um método bastante eficaz e versátil utilizado na remoção de metais tóxicos em solução aquosa é a adsorção. 8,9 O principal adsorbente utilizado para a remoção de vários compostos orgânicos e íons metálicos é o carvão ativado, porém o alto custo deste material é um sério problema. 10,11 Assim, a procura de novos materiais biológicos de fonte renovável, baixo custo, fácil manuseio e com menor impacto ambiental vem sendo incentivada. [12][13][14] No Brasil são produzidos os mais diversos subprodutos e resíduos agroindustriais (ex. bagaços de cana-de-açúcar, caju, coco verde e de outras frutas) em virtude da grande produção agrícola do país. Entretanto, a disposição dos resíduos gerados nestes setores está se transformando em sério problema ambiental. Apesar de uma parte ser utilizada para fins diversos, uma grande quantidade ainda permanece sem utilização. O aproveitamento industrial do caju é realizado principalmente na região Nordeste do país, visando, basicamente, o beneficiamento da castanha e, em menor escala, o aproveitamento do pedúnculo. Mesmo considerando o aproveitamento do pedúnculo sob a forma de sucos, doces, geléias, néctares, farinhas e fermentados, só 15% da produção do pedúnculo é utilizada. Uma das causas para esse baixo aproveitamento está relacionada ao tempo de deterioração do pedúnculo, que ocasiona excessivas perdas no campo e na indústria. 15Tecnologias de tratamento de efluentes a partir de resíduos agroind...

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Removal of cadmium ions with olive stones: the effect of somes parameters

Cited by 123 publications

References 12 publications

Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass

Removal of lead from water using biochars prepared from hydrothermal liquefaction of biomass

Adsorptive Removal of Heavy Metals from Aqueous Solution with Environmental Friendly Material—Exhausted Tea Leaves

Remoção de metais de solução aquosa usando bagaço de caju

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