Process optimization using response surface methodology for the removal of thorium from aqueous solutions using rice-husk

Varala, Sayanasri; Ravisankar, V.; Al-Ali, Maha; Pownceby, Mark I.; Parthasarathy, Rajarathinam; Bhargava, Suresh K.

doi:10.1016/j.chemosphere.2019.124488

Cited by 31 publications

(9 citation statements)

References 20 publications

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“…Pathways of adsorption process (Singh et al, 2018) Table 2. The linear forms of adsorption isotherm and kinetic models (Lima et al, 2015;Varala et al, 2019)…”

Section: Adsorbentmentioning

confidence: 99%

Adsorption and coagulation in wastewater treatment – Review

et al. 2021

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Wastewater issues became a complex challenge in the world. There are several methods in wastewater treatment, such as chemical, physical, biological, and the combination of each method. However, each process has advantages and disadvantages. The physicochemical methods are common methods used in wastewater treatment, such as adsorption and coagulation. Adsorption and coagulation are excellent methods to remove pollutants. The adsorption process is greatly influenced by pH, adsorbent dose, temperature, and contact time. Coagulant dose, settling time, and pH are the main factors in the coagulation process. Chemical material as an adsorbent and coagulant has been studied in previous research, but recently, to substitution chemical materials is a challenging subject. Natural substances are potential new materials in wastewater treatment and became popular due to their efficiency and environment friendly characteristics. This review investigated the role of adsorption and coagulation in wastewater treatment and the utilization of natural materials as adsorbents and coagulants.

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“…Pathways of adsorption process (Singh et al, 2018) Table 2. The linear forms of adsorption isotherm and kinetic models (Lima et al, 2015;Varala et al, 2019)…”

Section: Adsorbentmentioning

confidence: 99%

Adsorption and coagulation in wastewater treatment – Review

et al. 2021

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“…Its use as animal feed is also not recommended, as rice husk has low nutritional values. Thus, the use in the agricultural sector is precarious and alternatives to mitigate environmental impacts are required (VARALA et al, 2019;THOMAS, 2018;HUNER, 2017).…”

Section: Introductionmentioning

confidence: 99%

Recycling of waste from the rice chain: incorporation of rice husk and rice husk ash in polymeric composites

Flach

Krauspenhar

Jahno

2022

CeN

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The high need for polymeric materials and the availability of agro-industrial wastes, such as the rice production chain, demand the development of technologies to obtain polymeric composites based on these waste materials. Therefore, this work aims to develop materials using low density polyethylene (LDPE) as a polymer matrix and rice husk or rice husk ash, prepared by micronization in a whirlwind mill, as reinforcing fillers. The processing was carried out by injection molding, with formulations containing 20%, 30% and 40% of the filler. Tensile strength, hardness and water absorption properties were evaluated. The tensile strength of composites containing rice husk ash was higher than the same parameter for composites containing rice husk as filler. The highest tensile strength of 9.26 N/mm² was found for the material containing 20% of rice husk ash. The shore D hardness of materials containing rice husk ash was slightly higher. Regarding water absorption, the composites containing rice husk ash were those with lower absorption and all developed materials presented water absorption below 1.1%. Based on the results, we concluded that the composites have potential properties for the manufacture of polymeric consumer goods.

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“…The chemical composition and type of phytochemical present in the biosorbent is likely to affect the biosorption of metal from the water. Biosorbents from different ecological adaptation that have been tested for their metal biosorption potential are aquatic macroalgae Enteromorpha (Rangabhashiyam et al, 2016), aquatic plant Vallisneria gigantea (Iriel et al, 2015), husk of high-water requiring paddy (Varala et al, 2019), terrestrial tree Pongamia pinnata seed (Brungesh et al, 2015), leaves of Colocasia esculenta (Nakkeeran et al, 2016) and Ficus auriculata (Rangabhashiyam et al, 2015), and bagasse of sugarcane (Ullah et al, 2013). The main issue with the testing of materials is their low adsorption capacity (Nirmala et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Sustainable Chromium Recovery From Wastewater Using Mango and Jackfruit Seed Kernel Bio-Adsorbents

Giri¹,

Shah²,

Srivastava

et al. 2021

Front. Microbiol.

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Wastewater is a rich source of valuable chemicals of industrial importance. However, their economic recovery is crucial for sustainability. The objective of the present work is to recover hexavalent chromium (Cr VI) as a value-added transition metal from wastewater cost-effectively; the biosorbent derived from seed kernels of mango (M) and jackfruit (JF) were applied for removing the metal from simulated wastewater. The functional groups of the biomass were analysed with the help of Fourier transform infrared (FTIR) spectroscopy, micrographs were generated using a scanning electron microscope, and crystallinity was determined by an x-ray diffractometer (XRD). The concentration of Cr VI in wastewater was analysed by an inductively coupled plasma optical emission spectrometer (ICP-OES). Process parameters (pH, dose, contact time, temperature, and initial concentration) were optimized for efficient Cr VI adsorption using a response surface methodology-based Box–Behnken design (BBD) employing Design-software 6.0.8. The batch experiment at room temperature at pH 4.8 and Cr VI removal ∼94% (M) and ∼92% (JF) was achieved by using a 60-mg dose and an initial Cr (VI) concentration of 2 ppm in 120 min. The equilibrium Cr binding on the biosorbent was well explained using Freundlich isotherm (R2 = 0.97), which indicated the indirect interactions between Cr (VI) and the biosorbent. Biosorption of Cr (VI) followed the pseudo-order and intra-particle diffusion models. The maximum adsorption capacity of the M and JF bio-adsorbent is 517.24 and 207.6 g/mg, respectively. These efficient, cost-effective, and eco-friendly biosorbents could be potentially applied for removing toxic Cr (VI) from polluted water.

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Process optimization using response surface methodology for the removal of thorium from aqueous solutions using rice-husk

Cited by 31 publications

References 20 publications

Adsorption and coagulation in wastewater treatment – Review

Adsorption and coagulation in wastewater treatment – Review

Recycling of waste from the rice chain: incorporation of rice husk and rice husk ash in polymeric composites

Sustainable Chromium Recovery From Wastewater Using Mango and Jackfruit Seed Kernel Bio-Adsorbents

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