Effect of the Structure of Highly Porous Silica Extracted from Sugarcane Bagasse Fly Ash on Aflatoxin B1 Adsorption

Abstract

Sugarcane bagasse fly ash is industrial waste produced by incinerating biomass to generate power and steam. The fly ash contains SiO2 and Al2O3, which can be used to prepare aluminosilicate. This latter material exhibits high potential as an adsorbent in various applications, including the livestock industry where issues related to contamination of aflatoxins in animal feeds need to be addressed; addition of adsorbents can help decrease the concentration of aflatoxins during feed digestion. In this study, the effect of the structure of silica prepared from sugarcane bagasse fly ash on physicochemical properties and aflatoxin B1 (AFB1) adsorption capability compared with that of bentonite was investigated. BPS-5, Xerogel-5, MCM-41, and SBA-15 mesoporous silica supports were synthesized using sodium silicate hydrate (Na2SiO3) from sugarcane bagasse fly ash as a silica source. BPS-5, Xerogel-5, MCM-41, and SBA-15 exhibited amorphous structures, while sodium silicate possessed a crystalline structure. BPS-5 possessed larger pore size, pore volume, and pore size distribution with a bimodal mesoporous structure, while Xerogel-5 exhibited lower pore size and pore size distribution with a unimodal mesoporous structure. BPS-5 with a negatively charged surface exhibited the highest AFB1 adsorption capability compared with other porous silica. However, the AFB1 adsorption capability of bentonite was superior to those of all porous silica. Sufficient pore diameter with high total pore volume as well as high intensity of acid sites and negative charge on the surface of the adsorbent is required to increase AFB1 adsorption in the in vitro gastrointestinal tract of animals.

Synthesis and characterization of aluminosilicate and zinc silicate from sugarcane bagasse fly ash for adsorption of aflatoxin B1

“…The procedure for synthesizing sodium silicate from bagasse fly ash was executed according to the methodology outlined by Ruengrung et al 5 and Sungsinchai et al 15 . Initially, 18.648 g of bagasse fly ash, containing 74.23% silicon dioxide (SiO 2 ), was amalgamated with 22.601 g of sodium carbonate (Na 2 CO 3 , sourced from Kemaus, NSW, Australia), and underwent thorough homogenization for 30 min.…”

“…The methodology for obtaining SiO 2 was following the protocol established by Sungsinchai et al 15 . The resultant sodium silicate was mixed with deionized (DI) water to formulate a sodium silicate solution.…”

“…The NH 3 desorption analysis was conducted by flowing He (30 mL/min) while heating the sample from 100 to 600 °C at a rate of 10 °C/min. The intensity of the acid sites was evaluated by monitoring the weight loss result of NH 3 desorption 15 .…”

Potassium Permanganate-Impregnated Amorphous Silica–Alumina Derived from Sugar Cane Bagasse Ash as an Ethylene Scavenger for Extending Shelf Life of Mango Fruits

“…In Thailand, large amounts of sugar cane bagasse ash (SC) from sugar processing sites are currently used in the sugar and bioethanol manufacturing processes, creating plenty of solid waste ash . These ash wastes are not valuable and are generally disposed of on agricultural land.…”

Green synthesis of surfactant-free mesoporous silica with strong hydrophilicity via metal salt modifications for moisture adsorption

“…In our previous study, we successfully synthesized diverse porous silica products, specifically mesoporous silica (MPS). 17,23–25 MPS is intriguing due to its remarkable adsorption and separation properties, with a high specific surface area and tunable pore size distribution. 26–28 To enhance its performance for agricultural applications, such as improving pesticide efficacy and safety 29 and nutrient delivery, 30 the hydrophilic properties have been tailored by adjusting the surface functional groups, including Si–OH, Si–O, SiO 6 , and SiO 4 .…”