Turning waste into treasure: Carbonized walnut shell for solar-driven water evaporation

Wang, Yuzhu; Luo, Xinyi; Xin-yuan, Song; Guo, Wei; Yu, Kai; Yang, Chunyu; Qu, Fengyu

doi:10.1016/j.matlet.2021.131057

Cited by 12 publications

(7 citation statements)

References 13 publications

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“…However, both sewage purification and seawater desalination require a large amount of energy, so clean energy and a reliable water purification method are urgently needed. Solar energy is recognized as a clean and sustainable energy source, and solar steam generation is a reliable and convenient way of water purification [ 5 ]. Generally, the solar steam generation method using solar energy has only about approximately 35% light–heat conversion efficiency, and the evaporation efficiency is low; in addition, problems such as insufficient water supply and heat loss will occur in the evaporation process [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Fe3O4/Diatomite-Decorated Cotton Evaporator for Continuous Solar Steam Generation and Water Treatment

Bai

Xu²,

Yang

et al. 2022

Materials

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Improving the evaporation rate of solar steam generation (SSG) has always been a research hotspot to solve the shortage of water resources. Using cotton, Fe3O4, polyvinyl alcohol (PVA) and diatomite (DM) as raw materials, DM/PVA/Fe3O4@cotton composites with both firmness and hydrophilicity were prepared. Fe3O4 has a wide range of light absorption characteristics and good photothermal conversion performance, and is an ideal photothermal conversion material. PVA enhances the adhesion between Fe3O4, cotton and DM and enhances the hardness of the sample and the internal porous structure. The existence of DM greatly improves the hydrophilicity of the sample, ensuring that the water in the lower layer can be continuously transported to the surface of the sample, and DM makes the surface of the sample rough, which reduces the reflection of sunlight and improves the efficiency of light heat conversion. Under one-sun irradiation, the temperature of the sample surface increases by 52.6 °C, the evaporation rate can reach 1.32 kg m−2 h−1 and the evaporation efficiency is 82.9%. Using this sample as the photothermal conversion layer of the SSG device, the removal rate of salt ions in seawater is more than 98% and the removal rate of heavy metal ions in sewage is close to 100%. This work provides a new idea and design method for SSG in the field of seawater desalination and sewage treatment.

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Section: Introductionmentioning

confidence: 99%

Fe3O4/Diatomite-Decorated Cotton Evaporator for Continuous Solar Steam Generation and Water Treatment

Bai

Xu²,

Yang

et al. 2022

Materials

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“…The agricultural sector is very rich in wastes and/or restudies, which can be used in several industries. So, turning wastes into useful by-products can be considered a "true treasure" [85]. Walnut crops are really a treasure under different levels of its production and consumption (Figure 6).…”

Section: Walnut Crop Residues and Their Valorizationmentioning

confidence: 99%

“…The industry of oil extraction of walnuts itself is considered an important source for producing wastes from walnuts depending on the used pretreatment and processing technologies [92]. More potential of solid wastes from the walnut industry were confirmed, such as bioactive compounds and bioherbicides [93], solar energy-driven water evaporation [85], converting into value-added carbon nanomaterials [94], and producing biochar for removing pollutants from water/wastewater [95] or polluted soils [96].…”

Section: Walnut Crop Residues and Their Valorizationmentioning

confidence: 99%

An Overview on Traditional vs. Green Technology of Extraction Methods for Producing High Quality Walnut Oil

et al. 2022

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Walnut oil is extremely nutrient dense. It has plenty of oil and is high in fatty acids, which have positive biological properties and have a favorable impact on blood lipids and lipoproteins. Walnut oil is low in saturated fatty acids and high in unsaturated fatty acids as well as being high in other vital nutrients. Walnut oil can be extracted using traditional as well as new and green technologies. It is low in saturated fatty acids and high in unsaturated fatty acids (monounsaturated and polyunsaturated fatty acids) as well as being high in other vital nutrients (e.g., selenium, phosphorus, and zinc). Walnut oil can be extracted using traditional as well as new and green technologies. The chosen extraction method has a significant impact on the lipids and other important components extracted. It is critical to select a suitable extraction process for the compounds of interest. In this study, different extraction methods are reviewed, demonstrating the significant benefits of new methods over previous approaches. New green technologies are ecologically benign and allow for shorter extraction times and yields that are comparable to those obtained using traditional methods. The new green technologies allow for higher-quality oils that are less vulnerable to oxidation processes than most of the old technologies.

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“…Nevertheless, due to the increase in wood price and environmental protection, an important aspect is to find the possibility of utilizing different wastes in the carbonization process. Wang et al [ 4 ] and Xu et al [ 5 ] present the characterization of biochar from walnut shells. The influence of the pyrolysis parameters on biochar characteristics has been presented by Almeida et al [ 6 ], who analyzed sugarcane biomass, including bagasse, straw, and treated biomass.…”

Section: Introductionmentioning

confidence: 99%

Possible Utilization of Distillery Waste in the Carbonization Process

Kluska

2022

Materials

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This paper characterizes the carbonization process in terms of the utilization of distillery waste in a laboratory-scale reactor. Due to the increase in market prices of wood and environmental protection laws, biomass waste, including distillery waste, is a potential source for biochar production. An experimental investigation of the carbonization process was carried out for different mixtures of distillery waste and oak sawdust. The obtained results showed that due to the European Standard, biochar from distillery waste could be used for the production of charcoal briquettes for barbecue applications. In addition, biochar from carbonization samples with 66, 50, and 33% distillery waste meet the standards defined by the International Biochar Initiative for HMs content. The analysis of the dynamics of the heating rate showed that adding wood to distillery waste significantly shortens the carbonization process, but this reduces the number of bio-oils produced and its calorific value.

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Turning waste into treasure: Carbonized walnut shell for solar-driven water evaporation

Cited by 12 publications

References 13 publications

Fe3O4/Diatomite-Decorated Cotton Evaporator for Continuous Solar Steam Generation and Water Treatment

Fe3O4/Diatomite-Decorated Cotton Evaporator for Continuous Solar Steam Generation and Water Treatment

An Overview on Traditional vs. Green Technology of Extraction Methods for Producing High Quality Walnut Oil

Possible Utilization of Distillery Waste in the Carbonization Process

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