Application of central composite design for methyl red dispersive solid phase extraction based on silver nanocomposite hydrogel: Microwave assisted synthesis

Xie

et al. 2022

Foods

Pre-cooked adzuki beans (Vigna angularis), which looks like dried adzuki bean, is easily cooked and preserved. This study aimed to optimize the microwave pre-cooked conditions on adzuki beans by applying the response surface methodology. The results showed that soaking time has a significant effect on the gelatinization degree of adzuki beans according to microwave time. The most suitable gelatinization and the sensory scores were obtained with a soaking time of 7.8 h, a microwave power of 830 W, and microwave time of 92 s. The pre-cooked treatment had no significant effect (p > 0.05) on the protein, free amino acid, fat and starch content of adzuki bean products. The results of SEM and polarized light microscopy showed that the surface and center of starch were damaged after microwave treatment. XRD showed that microwave pre-cooking did not change the crystal structure of starch and maintained the original order of type A structure while reducing the relative starch crystallinity. FT-IR showed that the pre-cooked treatment did not produce new structure in adzuki bean starch, but the ratio of 1047/1022 cm−1 was slightly decreased, indicating that the starch crystallization area decreased relative to the amorphous area and the relative crystallinity decreased. The results of FTIR were consistent with X-ray diffraction results. Therefore, microwaves improved the gelatinization of adzuki beans and made the pre-cooked adzuki beans more suitable.

Section: Methodsmentioning

confidence: 99%

Optimization of Microwave Pre-Cooked Conditions for Gelatinization of Adzuki Bean

Xie

et al. 2022

Foods

ACS Appl. Polym. Mater.

“…10 Among these methods, adsorption stands out primarily because of its attractive characteristics, such as low cost, ease of implementation, and minimal generation of byproducts. 11 The success of the adsorption process is directly linked to the adsorbent, which must possess suitable surface properties and compatibility with the contaminants in the water environment. 12 Furthermore, recyclability is another desirable feature for an ideal adsorbent.…”

Section: ■ Introductionmentioning

confidence: 99%

Recyclable 3D-Printed Composite Hydrogel Containing Rice Husk Biochar for Organic Contaminants Adsorption in Tap Water

Silva,

Soares,

Nörnberg

et al. 2023

Water and wastewater treatment face significant challenges in removing organic contaminants, and the search for efficient processes and materials is crucial to reducing this issue. Herein, the design and manufacturing of 3D-printed composite hydrogels using a combination of alginate and rice husk biochar was proposed. These composite hydrogels were evaluated as adsorbents for removing ibuprofen (IBU) and methylene blue (MB) from tap water. Various characterization techniques, including FTIR, XRD, SEM, and BET analyses, confirmed the successful formation of the composite hydrogels. Also, the properties of the composite hydrogels, such as total porosity, cross-linking density, and swelling, were found to vary with the biochar content in the composite. Batch experiments demonstrated that the hydrogel containing 10% w/w biochar (Alg/Biochar10) has significant adsorption capacities for IBU (111.4 mg/g) and MB (214.6 mg/g). These values represented substantial increases of 48% (IBU) and 58% (MB) compared to the conventional hydrogel without biochar, highlighting the enhanced performance achieved by incorporating biochar into the composite. The adsorption kinetics of both IBU and MB followed the pseudo-first-order model, while the Freundlich isotherm model provided insights into the adsorption mechanism. Notably, the adsorption of MB on the composite hydrogel was particularly favorable due to electrostatic interactions between the adsorbent and the adsorbate. Furthermore, the composite hydrogel exhibited recyclability and reusability, as demonstrated through 20 reuse cycles, indicating its stability and practical applicability. In summary, the original 3D-printed composite hydrogels manufactured with the alginate/rice husk biochar ink showed great potential as adsorbent materials for organic removal from water and wastewater.

“…Wastewaters coming from dyeing industries can be toxic to aquatic life by weakening the light flux which strongly inhibits the photosynthetic process (Kumar et al 2018;Giannakoudakis et al 2015) and can cause severe effects to the human health (Suganya et al 2017;Kumar et al 2014a, b), due to their mutagenic and carcinogenic aspects (Jamshidi et al 2016). Furthermore, some recalcitrant dyes are resistant to bio-degradation ; Bardajee et al 2017;Khan et al 2011). Hence, many treatments have been conducted for removing the dyes from the textile effluents (Kumar and Subramaniam 2013;Setiabudi et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Response surface methodology for the optimization of acid dye adsorption onto activated carbon prepared from wild date stones

et al. 2019

In the present study, wild date stones (WDS) were used as a novel and sustainable precursor for high-quality activated carbon preparation to be applied for the removal of Acid Blue 25 dye (AB25) from synthetic water. The carbonization temperature of the raw material was selected at 850 °C on the basis of thermo-gravimetric analysis. The adsorbents were characterized by the BET method, Fourier transform infrared spectroscopy, and scanning electron microscopy. The results indicated that the activated carbon presents a high specific surface area (610.84 m 2 g −1 ) and a pore volume (0.224 cm 3 g −1 ) compared with the natural material. Based on the central composite design, the effect of different parameters such as the biomass dose, initial dye concentration, contact time and temperature was optimized and the optimal removal of AB25 (99.61%) was achieved for AB25 concentration of 100 mg L −1 and an adsorbent dose of 0.8 g L −1 , at 45 °C after 120 min. The kinetic studies indicated that the pseudo-second-order model was appropriately applied for the adsorption kinetic of AB25 onto wild date stones activated carbon. The intraparticle diffusion model is not the only controlling step, and other mechanisms may be involved in the adsorption process. The Langmuir isotherm provided the best fit with a high correlation coefficient (R 2 ) of 0.993 and a maximum monolayer adsorption capacity of 181.59 mg g −1 .