Pub Date : 2024-07-03DOI: 10.1007/s10570-024-06041-1
Pengju Qiao, Meng Yang, Jinmin Zhao, Zheng Wang, Gang Li, Jing Fang, Yong Qian, Hao Li
Solar Vapor Generation (SVG) is a new green production technology that is gaining increasing attention for obtaining fresh water from seawater or wastewater. Currently, the evaporator substrates face challenges such as complex fabrication processes, high cost, and poor biodegradability. Lignocellulosic sponge (LS), as a sustainable material, exhibits characteristics such as hydrophilicity, excellent insulation properties, lightweight nature, and low cost. It is considered a highly promising material for evaporators. In this study, LS was modified to create an efficient evaporator with excellent salt resistance. The polyvinyl alcohol/carbon black (PVA/CB) gel-based photothermal coating was introduced to enhance the water evaporation rate significantly on the surface of the lignocellulosic sponge. Subsequently, a polydimethylsiloxane (PDMS) coating was sprayed on the interfacial steam generator surface to form a hydrophobic layer, effectively resisting salt accumulation on the evaporator surface. Simultaneously, the incorporation of degreased cotton as a one-dimensional water pathway enhanced the salt ion backflow and prevented salt crystallization at the hydrophilic/hydrophobic interface. The resulting porous sponge-based photothermal evaporator (PCP-LS) achieved a high evaporation rate of up to 3.2 kg m−2 h−1 and demonstrated stable operation in high-concentration saltwater (20wt%). PCP-LS, as a cost-effective, easily fabricated, salt-tolerant, and environmentally friendly solar evaporator, holds great potential in seawater/wastewater treatment.
太阳能蒸发发电(SVG)是一种新型的绿色生产技术,在从海水或废水中获取淡水方面正受到越来越多的关注。目前,蒸发器基质面临着制造工艺复杂、成本高、生物降解性差等挑战。木质纤维素海绵(LS)作为一种可持续材料,具有亲水性、优异的绝缘性能、轻质和低成本等特点。它被认为是一种非常有前途的蒸发器材料。在本研究中,对 LS 进行了改性,以制造出一种具有出色耐盐性能的高效蒸发器。在木质纤维素海绵表面引入了聚乙烯醇/炭黑(PVA/CB)凝胶光热涂层,以显著提高水蒸发率。随后,在界面蒸汽发生器表面喷涂聚二甲基硅氧烷(PDMS)涂层,形成疏水层,有效防止盐分在蒸发器表面积聚。同时,脱脂棉作为一维水通路的加入增强了盐离子的回流,防止盐在亲水/疏水界面结晶。由此产生的基于多孔海绵的光热蒸发器(PCP-LS)实现了高达 3.2 kg m-2 h-1 的高蒸发率,并在高浓度盐水(20wt%)中稳定运行。PCP-LS 作为一种成本低廉、易于制造、耐盐且环保的太阳能蒸发器,在海水/废水处理方面具有巨大潜力。
{"title":"Sustainable lignocellulosic-based sponge with Janus salt-tolerant structure for efficient solar steam generation","authors":"Pengju Qiao, Meng Yang, Jinmin Zhao, Zheng Wang, Gang Li, Jing Fang, Yong Qian, Hao Li","doi":"10.1007/s10570-024-06041-1","DOIUrl":"https://doi.org/10.1007/s10570-024-06041-1","url":null,"abstract":"<p>Solar Vapor Generation (SVG) is a new green production technology that is gaining increasing attention for obtaining fresh water from seawater or wastewater. Currently, the evaporator substrates face challenges such as complex fabrication processes, high cost, and poor biodegradability. Lignocellulosic sponge (LS), as a sustainable material, exhibits characteristics such as hydrophilicity, excellent insulation properties, lightweight nature, and low cost. It is considered a highly promising material for evaporators. In this study, LS was modified to create an efficient evaporator with excellent salt resistance. The polyvinyl alcohol/carbon black (PVA/CB) gel-based photothermal coating was introduced to enhance the water evaporation rate significantly on the surface of the lignocellulosic sponge. Subsequently, a polydimethylsiloxane (PDMS) coating was sprayed on the interfacial steam generator surface to form a hydrophobic layer, effectively resisting salt accumulation on the evaporator surface. Simultaneously, the incorporation of degreased cotton as a one-dimensional water pathway enhanced the salt ion backflow and prevented salt crystallization at the hydrophilic/hydrophobic interface. The resulting porous sponge-based photothermal evaporator (PCP-LS) achieved a high evaporation rate of up to 3.2 kg m<sup>−2</sup> h<sup>−1</sup> and demonstrated stable operation in high-concentration saltwater (20wt%). PCP-LS, as a cost-effective, easily fabricated, salt-tolerant, and environmentally friendly solar evaporator, holds great potential in seawater/wastewater treatment.</p>","PeriodicalId":511,"journal":{"name":"Cellulose","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ionic Liquids (ILs) have been used to address issues such as recyclability, cost-effectiveness, and tailored thermophysical properties. This is most relevant to recent efforts directed at dissolving cellulose for filament spinning and bioproduct development. Herein, we introduce a simple method to investigate how interactions between cellulose films (roughness, Rh = 37 nm) and ILs specifically 1-butyl-3-methylimidazolium acetate ([bmim][OAc]), 1-butyl-3-methylimidazolium chloride ([bmim][Cl]), 1-ethyl-3-methylimidazolium acetate ([emim][OAc]), and 1-ethyl-3-methylimidazolium chloride ([emim][Cl]), along with their water mixtures (0, 5, and 10 wt%) affect thermophysical properties relevant to cellulose dissolution (surface tension, γ; contact angle, θ; diffusivities, D; and bulk density, ρ) at 363.15 K and 0.1 MPa under argon and air atmospheres. Thermophysical properties relevant to cellulose dissolution were measured at 363.15 K and 0.1 MPa under argon (surface tension, γ, contact angle, θ), and air (diffusivities, D and bulk density, ρ) atmospheres to reveal the effect of the IL counter ions on the involved interactions with water. In general, water increased γ, θ, but reduced D, which supports experimental observations indicating the detrimental effect of water on IL-cellulose interactions. The [emim]+ cation (in [emim][OAc] and [emim][Cl]), produced a lower contact angle with cellulose while the interfacial properties (γ, θ, D) for ILs with the [OAc]− anion were marginally affected by water. By contrast, the two ILs carrying [Cl]− anions exhibited a significant reduction in D (from 11.7(cdot {10}^{-13}) to 2.9(cdot {10}^{-13} {m}^{2}{s}^{-1})) in the cation shift from [emim]+ to [bmim]+ at 363.15 K and 0.1 MPa, with 0% water content. Overall, we present a methodical approach rooted in experimental and theoretical approaches to facilitate our understanding of ionic liquids (ILs), especially within the domain of bioprocessing.