Removal of Hexavalent Chromium and Turbidity in Drinking Water by Chitosan

Li, Shao Xiu; Lian, Yu; Feng, Jian; Tan, Jian Xiong; Hu, Shu Jie; Xia, Wen Qin; Duan, Wei

doi:10.4028/www.scientific.net/amr.433-440.793

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…However, for Cr(VI), the maximum removal efficiency of 56.41% at lower pH values around 1.0 was achieved. Previous works by Li et al (33), Gu et al (34), and Acar et al (35) have also presented the maximum Cr(VI) removal effective under similar pH conditions for various adsorbents. A more detailed examination of Fig.…”

Section: Results and Discussion Adsorption Featuresmentioning

confidence: 80%

Removal of Cu(II), Cr(III), and Cr(VI) from Aqueous Solution using a Novel Agricultural Waste Adsorbent

Lin

Wang

Duan

et al. 2013

Separation Science and Technology

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A novel adsorbent, chufa corm peels (CCP), is used for removing Cu(II), Cr(III), and Cr(VI) from aqueous solutions. The adsorption ability and characteristics of the CCP are thoroughly investigated. The adsorption capability for three heavy metal ions is in the order of Cu(II) > Cr(III) > Cr(VI). The morphology and elemental distribution on the biomass of CCP were evaluated by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Fourier-transform infrared spectroscopy (FTIR) analysis revealed that oxygen-containing functional groups, especially carboxylic and hydroxyl groups were responsible for chemical coordination between ionizable functional groups and metal ions. The adsorption features were evaluated based on the batch biosorption experiment. The results showed that the adsorption well meets the Freundlich adsorption isotherm models and pseudo-second-order kinetics model. In summary, this work demonstrated that CCP is an attractive, efficient, and low-cost adsorbent biomaterial that can be used for the removal of heavy metals from environmental contaminations.

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Section: Results and Discussion Adsorption Featuresmentioning

confidence: 80%

Removal of Cu(II), Cr(III), and Cr(VI) from Aqueous Solution using a Novel Agricultural Waste Adsorbent

Lin

Wang

Duan

et al. 2013

Separation Science and Technology

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“…68 Embora a quitosana tenha sido utilizada extensamente como coagulante, sua baixa solubilidade em água em pH neutro ou alcalino limita sua eficiência (apesar de existirem registros de quitosanas solúveis em pH 10). 69 Este empecilho pode ser superado através da inserção de novos grupamentos químicos na estrutura original do polímero, que aumentem sua solubilidade e expandem as possibilidades de aplicação dos biomateriais derivados.…”

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Natural Products Used as Coagulants and Flocculants for Public Water Supply: A Review of Benefits and Potentialities

Júnior¹,

Abreu²

2018

Rev. Virtual Quim.

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Abstract:The development of new coagulants and flocculants, based on nature-abundant biodegradable natural raw materials, has been gaining more space in research centers as an environmental technology that follows the concept of eco friendly materials and the principles of green chemistry proposed in the 1990s. When well exploited, these multifunctional agents can reduce the operational cost of water treatment and expand access to this resource. In view of the promising prospects for the use of natural products as sources of biocomposites, this review aims to compile the several studies developed in recent years that report on the obtaining and efficiency of natural materials such as coagulants and flocculants of water for supply, with emphasis on the chitosan, Moringa oleifera seeds and vegetable tannins. In parallel, it is also intended to expose the limitations and harms of traditional coagulants based on inorganic salts and synthetic polymers, as well as their mechanisms of action, in contrast to the main physico-chemical parameters used in the quality control of natural and treated waters.Keywords: Natural products; Green chemistry; Natural coagulants; Water treatment. ResumoO desenvolvimento de novos coagulantes e floculantes, baseados em matérias-primas naturais biodegradáveis abundantes na natureza, vem ganhando cada vez mais espaço nos centros de pesquisa como uma tecnologia ambiental que segue o conceito de materiais eco friendly e os princípios da química verde propostos na década de 90. Quando bem explorados, esses agentes multifuncionais podem permitir a redução do custo operacional do tratamento de água e expandir o acesso a esse recurso. Em face as perspectivas promissoras do uso de produtos naturais como fontes de biocompostos, esta revisão tem como objetivos compilar os diversos estudos desenvolvidos nos últimos anos que relatam a obtenção e eficiência de materiais naturais como agentes coagulantes e floculantes de águas para abastecimento, com ênfase na quitosana, sementes da espécie Moringa oleífera e taninos vegetais. Em paralelo, pretende-se também expor as limitações e malefícios dos coagulantes tradicionais a base de sais inorgânicos e polímeros sintéticos, bem como seus mecanismos de atuação, contrastando com os principais parâmetros físico-químicos utilizados no controle de qualidade de águas naturais e tratadas.Palavras-chave: Produtos Naturais; Química verde; Coagulantes naturais; Tratamento de águas.

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On the Removal of the Cr(VI) in Water by an Ordered Mesoporous Carbon Material: Kinetic and Isotherm Studies

Zhou

Zhang

et al. 2020

Water Air Soil Pollut

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Removal of Hexavalent Chromium and Turbidity in Drinking Water by Chitosan

Cited by 6 publications

References 6 publications

Removal of Cu(II), Cr(III), and Cr(VI) from Aqueous Solution using a Novel Agricultural Waste Adsorbent

Removal of Cu(II), Cr(III), and Cr(VI) from Aqueous Solution using a Novel Agricultural Waste Adsorbent

Natural Products Used as Coagulants and Flocculants for Public Water Supply: A Review of Benefits and Potentialities

On the Removal of the Cr(VI) in Water by an Ordered Mesoporous Carbon Material: Kinetic and Isotherm Studies

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