Evaluation of rice husk ash in adsorption of Remazol Red dye from aqueous media

Abstract In the present study, rice husk ash, which is a renewable and abundant material, was utilized as a carrier for lipase immobilization for the first time. Poly (ε-caprolactone) synthesis was successfully achieved by the new enzymatic catalyst: Candida antarctica lipase B immobilized onto surface-modified rice husk ashes by covalent binding. It was aimed to obtain optimum polymerization conditions at which highest molecular weight was reached and characterize the polymer produced. Moreover, thermal stability and effectiveness of the new biocatalyst in non-aqueous media were also shown with successful polymerization reactions. In addition, by using the new enzyme preparation, ε-caprolactone was able to be polymerized even at 30°C, which was promising for an energy saving process. Consequently, this work provides a new alternative route for poly (ε-caprolactone) synthesis.

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Moringa-functionalized rice husk ash adsorbent for the removal of amoxicillin in aqueous solution

MATEC Web of Conferences ◽

10.1051/matecconf/201926801005 ◽

2019 ◽

Vol 268 ◽

pp. 01005 ◽

Cited By ~ 1

Author(s):

Maria Patrichia Oliva ◽

Clinton Corral ◽

Michael Jesoro ◽

John Raymond Barajas

Keyword(s):

Aqueous Solution ◽

Rice Husk ◽

Low Income ◽

Contact Time ◽

Rice Husk Ash ◽

Aqueous Media ◽

Drug Resistant ◽

Practical Solution ◽

Significant Difference ◽

Treatment Facilities

Lack of stringent policies requiring water treatment facilities to combat occurrence of residual antibiotics in effluents critically impairs the resiliency of low-income communities to drug-resistant pathogens. In an attempt to mitigate the effects of residual drugs in aqueous media, we investigate the extent to which rice husk ash (RHA) functionalized by Moringaoleifera protein (MOP) sequestrates amoxicillin in solution. A semi-factorial design was implemented to evaluate the influence of initial amoxicillin concentration, initial MOP functionalized RHA dosage, and contact time on the removal on amoxicillin in water. Results of our experiments have shown that MOP functionalization enhanced RHA by doubling its rate to sequestrate amoxicillin molecules in solution. This strongly indicated that MOP adhered on the surface of RHA significantly improved its capacity to remove amoxicillin contamination in aqueous solution. Statistical analysis employed further supported our results by implying a significant difference between the performance of MOP-functionalized and bare RHA. In conclusion, our results strongly suggest that MOP functionalization can be a potential practical solution to alleviate the vulnerability of communities to emerging antibiotic pollution.

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Photocatalytic removal of Congo red dye using MCM-48/Ni 2 O 3 composite synthesized based on silica gel extracted from rice husk ash; fabrication and application

Journal of Environmental Management ◽

10.1016/j.jenvman.2017.08.048 ◽

2017 ◽

Vol 204 ◽

pp. 189-199 ◽

Cited By ~ 47

Author(s):

Mohamed Shaban ◽

Mostafa R. Abukhadra ◽

Ahmed Hamd ◽

Ragab R. Amin ◽

Ahmed Abdel Khalek

Keyword(s):

Silica Gel ◽

Rice Husk ◽

Congo Red ◽

Rice Husk Ash ◽

Congo Red Dye ◽

Photocatalytic Removal ◽

Red Dye

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A comparative study of the adsorption of congo red dye on rice husk, rice husk char and chemically modified rice husk char from aqueous media

Bulletin of the Chemical Society of Ethiopia ◽

10.4314/bcse.v34i1.4 ◽

2020 ◽

Vol 34 (1) ◽

pp. 41-54

Author(s):

Abdul Malik ◽

Abbas Khan ◽

Natasha Anwar ◽

Muhammad Naeem

Keyword(s):

Adsorption Isotherm ◽

Rice Husk ◽

Congo Red ◽

Aqueous Media ◽

Order Model ◽

Waste Products ◽

Chemically Modified ◽

Congo Red Dye ◽

Red Dye ◽

Best Fit

Desirable cost and removal effectiveness of the adsorbents can be obtained by the use and modification of agricultural waste products. Therefore, in this study rice husk (RH), rice husk char (RHC) and chemically modified rice husk char (CMRHC) were prepared and used as adsorbents for the removal of Congo Red dye from aqueous media under different experimental conditions. It was observed that the adsorption of Congo Red dye was not only affected with the types of adsorbents used but also with other experimental variables such as time, adsorbent dose, dye concentration, pH and temperature. Thermodynamics study indicated that the adsorption of Congo Red dye on the three adsorbents is spontaneous and exothermic process. Kinetics data showed that the adsorption of Congo Red dye on these adsorbents follow pseudo-second order model better than the pseudo-first order model. Equilibrium adsorption data were tested with Langmuir, Freundlich, and Temkin adsorption isotherm models. It was observed that the equilibrium data of RH and RHC were found best fit to the Langmuir adsorption isotherm model whereas that of CMRHC was best fit to the Freundlich and Temkin models. CMRHC showed better efficiency compared to both RH and RHC. Bull. Chem. Soc. Ethiop. 2020, 34(1), 41-54. DOI: https://dx.doi.org/10.4314/bcse.v34i1.4

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Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

Promyshlennoe i Grazhdanskoe Stroitel stvo ◽

10.33622/0869-7019.2019.11.20-26 ◽

2019 ◽

pp. 20-26

Keyword(s):

Mechanical Activation ◽

Rice Husk ◽

Amorphous Silica ◽

Silicon Oxide ◽

Rice Husk Ash ◽

Pozzolanic Activity ◽

Maximum Solubility ◽

Laboratory Conditions ◽

Before And After ◽

Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

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