Comparative Study of Copper Adsorptivity and Selectivity toward Zeolites

Kabwadza-Corner, Ponyadira; Munthali, Moses Wazingwa; Johan, Erni; Matsue, Naoto

doi:10.4236/ajac.2014.57048

Cited by 24 publications

(19 citation statements)

References 36 publications

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“…[4] [5]. Most of the applications of kaolin refer to its low cost, easy availability, non-toxicity, bulk properties and its surface chemical properties [6].…”

Section: Introductionmentioning

confidence: 99%

Functionalization and Structural Characterization of a Novel Nacrite-LiCl Nanohybrid Material

Jaafar¹,

Naamen²,

Rhaïem³

et al. 2015

AJAC

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The nacrite-LiCl hybrid composite material was prepared at room temperature by indirect intercalation of lithium chloride between the planar layers of nacrite, a clay mineral, using acetone as a solvent. The structural identification of the hybrid clay material was determined by means of X-ray diffraction (XRD), thermogravimetric analysis (TGA) and infrared spectroscopy (IR). The qualitative XRD analysis showed that the basal spacing value increased from 0.72 nm to 1.14 nm and revealed that the alkali halide intercalated successfully in the interlayer space of the nacrite framework. The quantitative XRD analysis allowed us to determine the optimum structural parameters related to the position and number of keyed ions and water molecules per half unit cell calculated along the c* axis and the goodness of fit parameter (Rp). The thermal properties of the elaborated hybrid were in great accordance with the XRD study and confirm the intercalation of the hydrated salt in the interlamellar space of nacrite. Moreover, IR spectroscopy enabled the study of the interactions between the silicate ''networks'' and the alkali halide.

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“…[4] [5]. Most of the applications of kaolin refer to its low cost, easy availability, non-toxicity, bulk properties and its surface chemical properties [6].…”

Section: Introductionmentioning

confidence: 99%

Functionalization and Structural Characterization of a Novel Nacrite-LiCl Nanohybrid Material

Jaafar¹,

Naamen²,

Rhaïem³

et al. 2015

AJAC

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“…Having a higher CEC was thought to be a property that would contribute positively to its adsorptive performance. The CEC data as presented in Table 1 has also been reported in our previous publication on the adsorption of Cu of different Zeolites [17]. ), the removal percentages were 76% and 69% for zeolites A4 and faujasite X.…”

Section: Adsorption Experimentsmentioning

confidence: 65%

“…Zeolite A4 was noted to have portrayed the highest adsorptive capacity for Pb in comparison with other zeolite samples. The maximum adsorptive capacities (X m ) of all the samples are as indicated in [17]. It follows that the adsorption of Pb is twice as high on Zeolite A4 and Faujasite X than is the same with Cu.…”

Section: Adsorption Isothermsmentioning

confidence: 77%

pH Dependence of Lead Adsorption on Zeolites

Kabwadza-Corner¹,

Johan²,

Matsue³

2015

JEP

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The adsorption of Pb on zeolites A4, X, Y and mordenite was studied at various initial pH with the purpose of assessing the pH dependence of Pb adsorption. The adsorption was conducted using 0 -0.6 mM Pb(NO3)2 in the presence of 100 mM NH4NO3 and pH adjustment done using HNO3. The coexisting NH4NO3 served as a representative of other cations available in nature. The study was conducted at initial solution pH ranging from 3 -5. Adsorption results were analyzed using Langmuir isotherm analysis. Adsorption was noted to be dependent on pH with increasing adsorption as pH increased from 3 -5 for zeolites A4, X and Y. The adsorption of Pb on mordenite on the other hand did not show any dependence on pH since it was almost constant within the studied pH range. The adsorptive capacities were 2500, 2000, 588 and 179 mmol•kg −1 for A4, X, Y and mordenite, respectively. The results of this study can be used in designing or planning for the clean-up of polluted water using adsorption techniques. An important attribute of these findings was that the samples studied were shown to have the capacity of removing even very low concentration of Pb, a property which is hardly achievable by most adsorbents.

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“…Organophosphates (OP) are artificial pesticides found during the Second World War to replace the organochlorine pesticides [1] because they are not biodegradable by microorganisms as it is a strong class of carcinogenic water/wastewater contaminant [2]. Photocatalytic is well known as low cost, environmentally friendly and sustainable water treatment technology to remove different classes of the poisonous organic pollutants under various type light irradiator [3,4].…”

Section: Introductionmentioning

confidence: 99%

Visible Light Driven Photocatalystfor Degradation of Organophosphate Pesticides: A Review

2019

BJoST

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Organophosphates (OPs) are insecticide used to replace the persistence organochlorines (OCs). OPs are the effective insecticide used to control pests to enhance crops productions. Due to the strong recalcitrant properties, OPs cannot totally be degraded by conventional wastewater treatment process and the effluent causes negative impacts to the environment. The effectiveness of the AOPs is relied on the strong radical namely hydroxyl radicals (•OH) which can convert the pollutants into less harmful products. Photocatalysis is one of the AOPs widely practiced in water treatment process. A good photocatalyst must able to promote the electron from its valance band to the conduction band and the prevent the photogenerated electrons from returning to its valance band. The electron generated was further reacted with oxygen to form peroxyl radicals, •O2-. The hole (h+) formed was then react with water molecule to form •OH. Titanium dioxide, TiO2 is well known photocatalyst which only can be activated under ultra-violet light. Visible light photocatalysts are in the current research trend as they are found to be an effective method to degrade contaminants in wastewater. Various type of dopants has been doped on the TiO2 with different method purposely to shift the absorption of light from the UV light region to visible light region. The purpose of this review is to present the studies on different preparation method of the modified TiO2 and application of the modified TiO2 in degrading different types of OP pesticides. Finally, the need for present and further research on OPs wastewater also briefly discussed.

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Comparative Study of Copper Adsorptivity and Selectivity toward Zeolites

Cited by 24 publications

References 36 publications

Functionalization and Structural Characterization of a Novel Nacrite-LiCl Nanohybrid Material

Functionalization and Structural Characterization of a Novel Nacrite-LiCl Nanohybrid Material

pH Dependence of Lead Adsorption on Zeolites

Visible Light Driven Photocatalystfor Degradation of Organophosphate Pesticides: A Review

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