Adsorption of Rhodamine B from an aqueous solution by acrylic-acid-modified walnut shells: characterization, kinetics, and thermodynamics

Guo, Xianzhe; Liu, Zhuozhuang; Tong, Zhiming; Jiang, Nan; Chen, Wu

doi:10.1080/09593330.2021.2011430

Cited by 7 publications

(2 citation statements)

References 69 publications

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“…Tree nutshells (e.g., almond, hazelnut, pistachio, walnut shells) have been investigated extensively for use in various industrial processes/practices. While tree nut biomass, such as walnut shells, has been converted to solid biofuel through torrefaction [23], tree nutshells have also been tested as economic biosorbents, such as: (1) toxic heavy metal removal from contaminated waters by nutshells [24], (2) rhodamine B cationic dye elimination from contaminated aqueous solutions with acrylic-acid-modified walnut shells [25], (3) aminefunctionalized walnut shells as a novel adsorbent for the removal of the pollutants PO 4 3− and NO 3 − ; the mechanism of the adsorption was determined as electrostatic interactions and hydrogen bonding [26]. Although walnut shell-derived cellulose nanocrystals possess the potential as effective nanocarriers in the food and drug delivery industries [27], studies exploring the use of walnut shells as drug/chemical delivery vehicles are currently very scarce.…”

Section: Agricultural Byproducts (Walnut Shell Particles) As Sa Deliv...mentioning

confidence: 99%

Natural Salicylaldehyde for Fungal and Pre- and Post-Emergent Weed Control

Kim

Chan

2022

Applied Sciences

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A sustainable, alternative weed control strategy is developed using salicylaldehyde (SA; 2-hydroxybenzaldehyde) as an active ingredient. SA is a natural, redox-active small molecule listed as a Generally Recognized As Safe food additive by the European Food Safety Authority and the United States Food and Drug Administration. The repurposing of SA determined that SA possesses both pre- and post-emergent herbicidal, fumigant activity, where the emitted SA from the source completely prevented the germination of plant seeds and/or the growth of the germinated plants. As a proof-of-concept, we developed agricultural byproducts (tree nutshell particles) as SA delivery vehicles to the soil, thus helping the growers’ sustainable byproduct recycling program, necessary for carbon sequestration. In plate assays, SA emitted from the nutshell vehicles (0.15 to 1.6 M) completely prevented the germination of six invasive or native weed seeds (monocots, dicots). In Magenta vessel assays, SA emitted from the nutshell vehicles (0.8 to 1.6 M) not only prevented the germination (pre-emergent) of Lagurus ovatus (Bunny Tails Grass) seeds but also inhibited the growth (post-emergent) of the germinated weeds. We determined further that soil covering (soil pasteurization) could be one of the practices to effectively deliver SA to the soil, whereby 1.6 M of SA emitted from the nutshell vehicles prevented the germination of the L. ovatus seeds maintained in soil trays covered with plastic tarp at 22 °C, while 0.8 M SA allowed partial (15%) germination of the weed seeds. Of note, SA also possesses an intrinsic antifungal activity that overcomes the tolerance of the stress signaling mutants of filamentous fungal pathogens (Aspergillus fumigatus, Penicillium expansum) to the phenylpyrrole fungicide fludioxonil. Environmental degradation data available in the public database indicate that, once released to the environment, SA will be broken down in the air by sunlight or microorganisms and, thus, is not built up in aquatic organisms. Altogether, SA can serve as a safe, potent pesticide (herbicidal, fungicidal) ingredient that promotes sustainable crop production by lowering the pesticide burden in fields.

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Section: Agricultural Byproducts (Walnut Shell Particles) As Sa Deliv...mentioning

confidence: 99%

Natural Salicylaldehyde for Fungal and Pre- and Post-Emergent Weed Control

Kim

Chan

2022

Applied Sciences

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“…Walnut shell as an inexpensive and natural adsorbent, has fast adsorption kinetics in removing dye from wastewater containing textile dyes (Guo et al 2021;Liu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue Dye Using Crushed Walnut Shell Adsorbent –Determining Comminution Energy and Optimal Operational Conditions

Afrozi

Lak

Nezhad

2023

Preprint

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Serious environmental issues might be associated with Methylene Blue(MB) contaminated wastewaters as this synthetic dye is environmentally persistent, toxic, carcinogenic and mutagenic. Crushed-raw Walnut shell(WS) biosorption process provides an effective treatment method. Although with an increase in the specific surface area of the fine adsorbent particles higher efficiency in dye removal could be expected, the comminution energy will simultaneously increase. Consequently, we used a developed Bond-grindability-test, which measures the amount of energy required for comminution, to estimate energy consumption. In addition to adsorbent particle size(course/moderate/fine), two affective parameters of adsorbent to dye ratio and adsorbent dosage, were considered. According to the central composite design-circumscribed, 33 experiments were planned in three groups associated with each size ranges. The results of FTIR spectroscopy confirmed that MB molecules interact with WS functional groups as shifts in the spectrum of treated vs raw WS particles were observed. The Bond-work-index estimated as 564 kWh/t, revealing the standard WS comminution energy. The formation of extended cracks on the fine particles’ surface, due to significant required crushing energy, provided a porous medium for multilayer coatings, validated the compatibility of the Freundlich model for this category. The maximum adsorption efficiency for course particles was over 96% corresponding to 4.61 g/L of WS and 108.58 mg/L of MB. Accordingly, the energy consumption for each mg of adsorbed dye was 7.65 Joules. The removal efficiency of moderate to fine particles depended only on the adsorbent to dye ratio (i.e., 30.5 ~ 34.8 and 31.6 ~ 37.4 g/g, respectively, to achieve maximum MB removal efficiency).

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