Surface modification of coconut-based activated carbon by liquid-phase oxidation and its effects on lead ion adsorption

Song, Xiaolan; Liu, Hongyan; Cheng, Lei; Qu, Yixin

doi:10.1016/j.desal.2010.01.011

Cited by 235 publications

(93 citation statements)

References 38 publications

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“…The pH at the point of zero charge of adsorbents indicates the chemical and electrical potential of the functional groups on solid surface [8]. Generally, the surface charge of the adsorbents is positive when the pH of the adsorbate solution is lower than the pHPZC.…”

Section: Ph At the Point Of Zero Charge (Phpzc)mentioning

confidence: 99%

“…Adsorption of metal ions or polar substances such as agricultural chemicals from aqueous solution may be associated with the ion exchange mechanism with adsorbents. Acidic functional groups on the modified carbon may perform as ion exchangers and enhance the adsorption though modifying its selectivity to metal cation species in aqueous solution [8]. Radovic et al [9] also proposed that the acidic modification makes the donoracceptor complexes that are positioned on the larger micropore.…”

Section: Introductionmentioning

confidence: 99%

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Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

Khandaker

Kondo

Toyohara

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. The surface chemistry and the structural properties of activated carbon can be altered by the acidic modification. The objective of this study is to investigate the changes occurring in bamboo charcoal (BC) during activation with concentrated nitric acid. Low temperature (500˚C) carbonized BC has been prepared and oxidized with 70% concentrated boiling nitric acid (BC-AC). The porous properties of the BC are analyzed with nitrogen adsorption isotherm at 77 K. The surface structure is observed by Field emission scanning electronic microscope (FESEM) and the surface functional groups are examined by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and the pH of the point of zero charge (pHPZC). The results reveal that severe oxidation with HNO3 considerably decreases the surface area of BC with enhanced pore widening and FESEM observation demonstrates the erosive effect of oxidation. The FTIR analysis detects that some absorption bands are assigned for carboxyl, aldehyde and ketone groups on BC-AC. The XPS analysis also clearly shows that the ratio of oxygen and acidic functional groups has been enriched significantly on the BC-AC. The low pHPZC value of BC-AC confirms that the surface is highly acidic for the fixation of acidic functional groups on surface. In general, the existence of the abundant amount of acidic functional groups on adsorbents enhances the sorption of heavy metals ions in aqueous solution. Therefore, it is strongly expected that the modified BC, activated under the proposed conditions would be a promising ion exchanger in aqueous solution and can be applied for the adsorption of different heavy metal ions and radioactive materials from effluent.

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Section: Ph At the Point Of Zero Charge (Phpzc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

Khandaker

Kondo

Toyohara

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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“…Los materiales de partida para obtener carbón activado también pueden ser: algas, cáscara de arroz, lignina, aserrín, cáscara de semilla de algodón, lignito, lodos ácidos de petróleo, madera, carbón mineral, huesos de frutas, melaza, carbón vegetal, desperdicios de pasta de papel, negro de humo, residuos de carne y sangre, olotes, huesos, desechos de destilería, pescado, cereales, cuesco de palma africana, turba, carbohidratos, coque de petróleo, granos de café, hollín, cáscara de nueces, grafito (Caglayan y Aksoylu, 2013), cáscara de coco (Song et al, 2010), cáscara de frutas (Tongpoothorn et al, 2011) y residuo de tabaco (Kilic et al, 2011). Estas materias primas deben tener alto contenido de carbono y bajo contenido de material mineral, y ser de fácil activación, alto rendimiento, baja degradación durante su almacenamiento y bajo costo.…”

Section: Introductionunclassified

Área superficial de carbones activados y modificados obtenidos del recurso agrícola Saccharum officinarum

Colpas

Tarón

González

2017

rcia

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RESUMENEl carbón activado es un material utilizado industrialmente en adsorción de gases, filtrados, limpieza de líquidos y como soporte para catalizadores en medios no oxidantes. Además tiene varias aplicaciones ambientales como en la adsorción de iones metálicos de plomo. El objetivo de este trabajo fue la obtención de carbones activados carbonizando biomasa de caña de azúcar a 400°C en atmósfera de nitrógeno, activando con ácido fosfórico y oxidando con ácido nítrico o peróxido de hidrógeno seguido de tratamiento térmico. La preparación de carbones activados a partir de residuos agrícolas está desarrollándose con excelentes resultados potencialmente aplicables. Bajo este contexto, se muestra un método de preparación mediante activación química con ácido fosfórico, la cual aumentó el contenido de carbono y disminuyó el de oxígeno, seguidamente con el objeto de estudiar el desarrollo del área superficial se somete a proceso de oxidación con calentamiento térmico. Los carbones obtenidos fueron caracterizados mediante análisis proximal y para la determinación de los grupos funcionales oxigenados se utilizó la espectroscopia infrarroja de reflectancia difusa-transformada de Fourier. La determinación de grupos oxigenados básicos y ácidos se realizó por el método Boehm. Para la medición del área superficial se utilizó el método BET.

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“…Because of extend application in many industries the concentration of this element in blood in some country exceeds 50 to 200 times more than ancient time. Lead contamination in water and wastewater, which resulted from many industries such as metal plating, mining and tanneries, is a serious problem due to the poisoning effect on humans and to the other adverse effects on receiving water 1 …”

Section: Introductionmentioning

confidence: 99%

The magnited of Lead in zahedan ground water

Atashi¹,

Rahimi²,

Espaili³

2010

Curr. World Environ

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Water is our essential nutrient that contains different amounts of dissolved inorganic and organic compounds. We can survive weeks even months without food, but only less than four days without water. Water play main role in digestion, circulation and transporting of nutrients in our body, also carrying away waste from our body. About 50 percent of water that we use provide from ground water, so it is necessary we sure from its safety. Provide of fresh water is one of basic problem in our modern world and this problem is very serious in country such as IRAN that located in dry and semidry region.Zahedan city is located in south east of Iran close to Pakistan boarder that fresh water is provided mainly in ground water. Rapid growth, Current World EnvironmentVol. 5(2), 223-227 (2010) ABSTRACTZahedan city is located in the dry and semidry area in the Iran and close to Pakistan boarder. At this region fresh drinking water is limited to groundwater resource. Because of main role of water in the transmission several type of disease and assess the risks of adverse health effect on human exposure to lead influenced by human activities and geological survey in Zahedan we decide to test water sample from 10 well in separate places in zahedan for measuring quantity of lead. We have measured lead concentration by flame atomic absorption spectroscopy. The concentration of lead in sampling wells was the range of 1.47 to 1.68 ppm. Comparing the amounts of measured lead concentration of lead are more than standard limit (0.01ppm) in all the wells. In order to determine contaminated regions and direction of pollution diffusions, we have down isoconcentration counters on the geological map of the area. By the obtaining information about industrial, agricultural, animal husbandry activities, geological and geochemistry of the region we have defind the origin of grand water pollution of the region.

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Surface modification of coconut-based activated carbon by liquid-phase oxidation and its effects on lead ion adsorption

Cited by 235 publications

References 38 publications

Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

Área superficial de carbones activados y modificados obtenidos del recurso agrícola Saccharum officinarum

The magnited of Lead in zahedan ground water

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