Experimental study on solar interfacial evaporation based on vapor pressure characteristics of different solutions

doi:10.11949/0438-1157.20210916

Abstract

Abstract:

Solar interface evaporation can achieve high-efficiency solar desalination and evaporative sewage treatment, but most of the current research is limited to pure water or NaCl solution. The actual solute in desalination and wastewater treatment will be different, which will lead to different vapor liquid equivalent behavior of the solution and affect the evaporation performance, but the research in this area is lack. This work analyzes different vapor pressure curves of the solution with different concentration, and divides them into three types: convex type, concave type and straight type,and further selects [EMIM][OTf]/H₂O, [EMIM][Ac]/H₂O and NaCl/H₂O as representative solutions. Experiments were conducted under different irradiation intensities and concentrations, and the evaporation of pure water was compared. The experimental results show that [EMIM][OTf]/H₂O exhibits good evaporation performance under low concentration, the main reason is that its vapor pressure is in the convex region; when the concentration of the solution increases or when the irradiation intensity increases, the evaporation rate of the [EMIM][OTf]/H₂O is lower than that of the NaCl/H₂O, the reason is that the concentration polarization of the evaporation process causes the concentration of [EMIM][OTf]/ H₂O at the gas-liquid interface to increase, and the difference in vapor pressure is small; the evaporation rate of [EMIM][Ac]/H₂O is the lowest under different working condition, while the evaporation rate of pure water is the highest, which reflects the key influence of vapor pressure on evaporation performance, because low vapor pressure leads to high evaporation temperature and more energy loss.

Key words: vapor liquid equilibrium, evaporation, interfacial evaporation, solution, solar energy, water treatment

摘要：

太阳能界面蒸发可实现高效太阳能海水淡化和蒸发式污水处理，但目前的研究大多局限于纯水或NaCl溶液。实际脱盐或废水处理中溶质会与此不同，导致溶液蒸气压变化并影响蒸发性能。本文首先分析了溶液表面蒸气压曲线类型，将其分为上凸型、下凹型和直线型。针对这几种蒸气压曲线进一步选取[EMIM][OTf]、[EMIM][Ac]和NaCl水溶液作为代表溶液，在不同辐照强度和浓度下进行了实验研究，并与纯水的蒸发作对比。实验结果表明：低浓度下[EMIM][OTf]水溶液展现出了良好的蒸发性能，主要原因是由于其蒸气压处于上凸区间；当溶液浓度升高或辐照强度提升时，[EMIM][OTf]溶液的蒸发速率提升较NaCl水溶液小，主要原因在于蒸发过程的浓度极化导致气液界面处的[EMIM][OTf]浓度升高，蒸气压相差较小；不同工况下[EMIM][Ac]水溶液的蒸发速率均较慢，纯水的蒸发速率最快，体现了蒸气压对蒸发性能的关键影响，原因是低蒸气压导致高蒸发温度，并带来更多的能量损失。

关键词: 汽液平衡, 蒸发, 界面蒸发, 溶液, 太阳能, 水处理

CLC Number:

TK 519

Jiebing WANG, Jintong GAO, Zhenyuan XU. Experimental study on solar interfacial evaporation based on vapor pressure characteristics of different solutions[J]. CIESC Journal, 2022, 73(2): 663-671.

王洁冰, 高金彤, 徐震原. 基于不同类型溶液蒸气压特性的太阳能界面蒸发实验研究[J]. 化工学报, 2022, 73(2): 663-671.

Figures/Tables 10

Fig.1 Variation of surface vapor pressure of different solutions with mass fraction (25℃)

Fig.2 Schematic diagram and physical diagram of solar interfacial evaporation

Fig.3 Cotton fabric before (a) and after (b) loaded with carbon black

Fig.4 Solar absorption spectrum with and without loading carbon black

Fig.5 Schematic diagram of the total evaporation experiment device

Table 1 Measurement uncertainty from sensor （UNC） and data acquisition （DAQ）

温度（DAQ）/K

质量（UNC，分析天平）/g

质量（DAQ）/g

长度（UNC，游标卡尺）/mm

光照强度（UNC，辐照仪）/(W/m²)

0.02

0.1%

Fig.6 The evaporation rate and temperature of different working fluids with a mass fraction of 5% under a sunlight intensity

Fig.7 The mass change, temperature of the evaporator surface and evaporation rate of different working fluids with a mass fraction of 5% under different sunlight intensities

Fig.8 The temperature of the evaporator surface and evaporation rate of different working fluids with a mass fraction of 5% and 10% under one sunlight intensity

Fig.9 The mass change， the change of evaporator surface temperature, the change of evaporation rate, of 3.5% NaCl solution and [EMIM][OTf] solution for long-term evaporation, and the surface map of the evaporator after 3.5 h

References 31

1	Wang Z H, Liu Y M, Tao P, et al. Bio-inspired evaporation through plasmonic film of nanoparticles at the air-water interface[J]. Small, 2014, 10(16): 3234-3239.
2	Ghasemi H, Ni G, Marconnet A M, et al. Solar steam generation by heat localization[J]. Nature Communications, 2014, 5: 4449.
3	Chang C, Tao P, Fu B W, et al. Three-dimensional porous solar-driven interfacial evaporator for high-efficiency steam generation under low solar flux[J]. ACS Omega, 2019, 4(2): 3546-3555.
4	Chang C, Tao P, Xu J, et al. High-efficiency superheated steam generation for portable sterilization under ambient pressure and low solar flux[J]. ACS Applied Materials & Interfaces, 2019, 11(20): 18466-18474.
5	Liu Z P, Yang Z J, Huang X C, et al. High-absorption recyclable photothermal membranes used in a bionic system for high-efficiency solar desalination via enhanced localized heating[J]. Journal of Materials Chemistry A, 2017, 5(37): 20044-20052.
6	Wang Z, Horseman T, Straub A P, et al. Pathways and challenges for efficient solar-thermal desalination[J]. Science Advances, 2019, 5(7): eaax0763.
7	Lv B, Gao C, Xu Y L, et al. A self-floating, salt-resistant 3D Janus radish-based evaporator for highly efficient solar desalination[J]. Desalination, 2021, 510: 115093.
8	Cheng G, Wang X Z, Liu X, et al. Enhanced interfacial solar steam generation with composite reduced graphene oxide membrane[J]. Solar Energy, 2019, 194: 415-430.
9	Ni G, Li G, Boriskina S V, et al. Steam generation under one sun enabled by a floating structure with thermal concentration[J]. Nature Energy, 2016, 1: 16126.
10	Ito Y, Tanabe Y, Han J H, et al. Multifunctional porous graphene for high-efficiency steam generation by heat localization[J]. Advanced Materials, 2015, 27(29): 4302-4307.
11	Chen C L, Zhou L, Yu J Y, et al. Dual functional asymmetric plasmonic structures for solar water purification and pollution detection[J]. Nano Energy, 2018, 51: 451-456.
12	Feng R, Qiao Y M, Song C Y. A perspective on bio-inspired interfacial systems for solar clean-water generation[J]. MRS Communications, 2019, 9(1): 3-13.
13	Li X Q, Li J L, Lu J Y, et al. Enhancement of interfacial solar vapor generation by environmental energy[J]. Joule, 2018, 2(7): 1331-1338.
14	Tao P, Ni G, Song C Y, et al. Solar-driven interfacial evaporation[J]. Nature Energy, 2018, 3(12): 1031-1041.
15	Bai H Y, Zhao T H, Cao M Y. Interfacial solar evaporation for water production: from structure design to reliable performance[J]. Molecular Systems Design & Engineering, 2020, 5(2): 419-432.
16	Li H R, Yan Z, Li Y, et al. Latest development in salt removal from solar-driven interfacial saline water evaporators: advanced strategies and challenges[J]. Water Research, 2020, 177: 115770.
17	Zhang Y X, Xiong T, Nandakumar D K, et al. Structure architecting for salt-rejecting solar interfacial desalination to achieve high-performance evaporation with in situ energy generation[J]. Advanced Science, 2020, 7(9): 1903478.
18	Shan X, Lin Y, Zhao A, et al. Porous reduced graphene oxide/nickel foam for highly efficient solar steam generation[J]. Nanotechnology, 2019, 30(42): 425403.
19	Shi Y, Li R Y, Jin Y, et al. A 3D photothermal structure toward improved energy efficiency in solar steam generation[J]. Joule, 2018, 2(6): 1171-1186.
20	Ni G, Zandavi S H, Javid S M, et al. A salt-rejecting floating solar still for low-cost desalination[J]. Energy & Environmental Science, 2018, 11(6): 1510-1519.
21	Xia Y, Hou Q F, Jubaer H, et al. Spatially isolating salt crystallisation from water evaporation for continuous solar steam generation and salt harvesting[J]. Energy & Environmental Science, 2019, 12(6): 1840-1847.
22	Wu L, Dong Z C, Cai Z R, et al. Highly efficient three-dimensional solar evaporator for high salinity desalination by localized crystallization[J]. Nature Communications, 2020, 11: 521.
23	Cooper T A, Zandavi S H, Ni G W, et al. Contactless steam generation and superheating under one sun illumination[J]. Nature Communications, 2018, 9: 5086.
24	Hou Q, Zhou H Y, Zhang W, et al. Boosting adsorption of heavy metal ions in wastewater through solar-driven interfacial evaporation of chemically-treated carbonized wood[J]. Science of the Total Environment, 2021, 759: 144317.
25	Bülow M, Greive M, Zaitsau D H, et al. Extremely low vapor-pressure data as access to PC-SAFT parameter estimation for ionic liquids and modeling of precursor solubility in ionic liquids[J]. ChemistryOpen, 2021, 10(2): 216-226.
26	张润楠, 范晓晨, 贺明睿, 等. 煤气化废水深度处理与回用研究进展[J]. 化工学报, 2015, 66(9): 3341-3349.
	Zhang R N, Fan X C, He M R, et al. Research progress on deep treatment and reclamation of coal gasification wastewater[J]. CIESC Journal, 2015, 66(9): 3341-3349.
27	张兰河, 万洒, 陈子成, 等. 高分子絮凝剂处理高浓度化妆品原料生产废水研究[J]. 化工学报, 2020, 71(8): 3730-3740.
	Zhang L H, Wan S, Chen Z C, et al. Treatment of high-strength wastewater generated in cosmetics raw materials production using polymer flocculants[J]. CIESC Journal, 2020, 71(8): 3730-3740.
28	Yu K F, Shao P F, Meng P W, et al. Superhydrophilic and highly elastic monolithic sponge for efficient solar-driven radioactive wastewater treatment under one sun[J]. Journal of Hazardous Materials, 2020, 392: 122350.
29	马文清. 基于热分解稳定性的咪唑类离子液体热力学性质研究[D]. 包头: 内蒙古科技大学, 2020.
	Ma W Q. Thermodynamic properties of imidazole ionic liquids on the basis of thermal decomposition stability[D]. Baotou: Inner Mongolia University of Science & Technology, 2020.
30	Huang S, Wang Z H, Liu S L, et al. Measurement and prediction of vapor pressure in binary systems containing the ionic liquid [EMIM][DCA[J]. Journal of Molecular Liquids, 2020, 309: 113126.
31	Kline S, McClintock F. Describing uncertainties in single-sample experiments[J]. Mechanical Engineering, 1953, 75: 3-8.

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