Physico-chemical characteristics of some Lesotho’s clays and their assessment for suitability in ceramics production

Masheane, Monaheng L.; Nthunya, Lebea N.; Mubiayi, Mukuna Patrick; Thamae, Thimothy; Mhlanga, Sabelo D.

doi:10.1080/02726351.2016.1226226

Cited by 13 publications

(13 citation statements)

References 19 publications

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“…The physicochemical characterization of selected clay samples from three different locations in the Democratic Republic of Congo (DRC) was investigated. The density of the three clay samples was relatively close: 2.71 g/cm 3 for GOL and 2.81 and 2.87 g/cm 3 for KAT and KOL, respectively. On the other hand, the particle size distribution for all the samples is ranged from 0.41 to 418.6 μm.…”

Section: Discussionmentioning

confidence: 90%

“…The density measurement of the clay samples was carried out, and the results show that the density of GOL is the lowest (2.7089 g/cm 3 ), whereas the density values of KAT and KOL are 2.8052 and 2.8678 g/cm 3 , respectively. The values of the pH were acidic 5.80, 4.54, and 4.93, respectively, for GOL, KAT, and KOL clay samples.…”

Section: Resultsmentioning

confidence: 99%

“…Several researchers have studied clay samples from different locations and have provided their usages, including the construction and ceramic industry, − cosmetic, − and removal of pollutants such as pharmaceuticals , from wastewater. Globally, hazardous chemicals including nitrophenol are released into sewages, rivers, seas, and the environment.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

et al. 2020

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This study investigated the geochemical and physicochemical characteristics of natural clay collected in the Democratic Republic of Congo. The optical properties of the sample collected in Golf (GOL) were tested in the removal of 4-nitrophenol in aqueous solution. The geochemical analysis depicted that all the samples are plotted within the shale quadrant. Furthermore, the Chemical Index of Alteration (CIA) indicated that the samples are extremely weathered. The particle size distribution ranged from 0.41 to 418.6 μm, while the pore diameters for all the samples were under 100 Å. A flake-like surface morphology was observed in all the samples. SiO2, Al2O3, Fe2O3, K2O, and TiO2 were the major chemical compounds found in all the samples, while the XRD analysis showed the presence of quartz, kaolinite, magnetite, and illite. The presence of metal oxides (i.e., TiO2 and Fe2O3) indicated that these natural clays can be used for photocatalytic oxidation of pollutants. The sample collected in Katuba (KAT) displayed the higher reflectance percentages for the selected wavelengths except at 200 nm. Interestingly, the GOL sample exhibited lower energy band gaps (2.68 and 3.94 eV) necessary for photocatalysis. The untreated GOL clay sample removed 99.13% of 4-nitrophenol from aqueous solution through the photodegradation process. The usage of the untreated GOL clay could be a cost-effective solution in the removal of 4-nitrophenol in wastewater.

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Section: Discussionmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

et al. 2020

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“…The finely ground clay sample (about 1 kg) was obtained from the Technology Incubation Group at the University which was used for production of ceramics and clay bricks. This sample had been characterized before using X-ray diffraction technique in two different studies and produced the data shown in Table 1 [23,24]. This sample was washed with ethanol to remove all the organics that could be adsorbed on it and rinsed with copious amount of distilled deionized water before being dried in an oven at 40 °C thereafter stored in clean Schott® bottles away from organic compounds sources till further use.…”

Section: Collection and Treatment Of Clay Samplesmentioning

confidence: 99%

Exploration of the Local Clay in Removing the Blue Textile Dye from the Blue Stream Commonly Known as ‘Mabolou Running through Thetsane Industrial Area, Maseru

Ntsapi¹,

Tubatsane²,

Machachamise³

et al. 2018

Int J Waste Resour

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In te rnation a l J o u rn al of W a s te R es ourc e s AbstractAs a search for affordable and efficient adsorbents for purification of textile wastewater continues, different natural materials are being investigated. Herein we report the investigation of clay obtained from Lesotho as a low cost and ecofriendly adsorbent for removal of blue textile dye from the stream running through the textile industry populated area in Ha Thetsane about 3 km South West of Maseru -the capital city of Lesotho. Batch adsorption studies were carried out for the effect of mass of adsorbent and particle size, pH, temperature and contact time on the adsorption capacity of the blue dye on the clay. The results show that the smaller the particle size of the adsorbent the higher the efficiency, although the smaller particles could also clog the pores of the filter paper; the adsorption increases under the basic media (pH ≥ 10) and at a low temperature (10-15°C) achieving an extraction efficiency of 88% for a 4 g clay and a 15 mL solution after 15 minutes extraction relative to the original solution. Despite the identity of the dye not being known, the clay adsorbent was found to be quite effective for the removal of this dye. The focus of the future experiments will be to obtain the information from the factories through the relevant government departments about the identity of the dye so that definitive quantitative analysis could be carried out.

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“…Such mineral self-cleaning additives applied to façades and subjected to solar irradiation and water decreased the surface adhesiveness of particles, thus preventing the deposit of fine or organic materials even on rough surfaces. The speed of the self-cleaning oxidation reaction is related to UV intensity, temperature, relative humidity, TiO 2 content, and particle adhesiveness [11,18,20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Self-Cleaning Potential of Glass Fiber Reinforced Concrete (GRC) with TiO2 Nanoparticles

et al. 2022

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The materials used in civil construction are undergoing significant advances to achieve reduced maintenance and increased durability. This study analyzed the self-cleaning potential of Glass fiber Reinforced Concrete (GRC) with the addition of titanium dioxide (TiO2) in contents of 3, 5, and 7% with respect to the mass of cement. We evaluated the self-cleaning GRC plates and the compressive and flexural strength of cylindrical and prismatic specimens. Prepared GRC sample plates were stained with dye solution (rhodamine B and methylene blue) and exposed to the four cardinal solar orientations of a building façade (north, south, east, and west) at different inclination angles (0°, 45°, and 90°) with respect to ground level. Results showed that the samples that presented the greatest performance were plates positioned in a north orientation and inclined at 0° in relation to ground level. The inclusion of TiO2 positively affected the consistency of the mixtures and improved the properties of the GRC in the hardened state. Measured rupture stresses were greater than 100 MPa in compressive strength and 20 MPa in flexure. The results of this study showed that the introduction of TiO2 in concrete with high strengths did have great relevance for the self-cleaning of white concrete.

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Physico-chemical characteristics of some Lesotho’s clays and their assessment for suitability in ceramics production

Cited by 13 publications

References 19 publications

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

Geochemical and Physicochemical Characteristics of Clay Materials from Congo with Photocatalytic Activity on 4-Nitrophenol in Aqueous Solutions

Exploration of the Local Clay in Removing the Blue Textile Dye from the Blue Stream Commonly Known as ‘Mabolou Running through Thetsane Industrial Area, Maseru

Analysis of the Self-Cleaning Potential of Glass Fiber Reinforced Concrete (GRC) with TiO2 Nanoparticles

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