Porous evaporators with special wettability for low-grade heat-driven water desalination

Zhu, Zhigao; Xu, Ying; Luo, Yifei; Wang, Wei; Chen, Xiaodong

doi:10.1039/d0ta09193f

Cited by 73 publications

(36 citation statements)

References 262 publications

(341 reference statements)

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“…The high evaporation rate of this report would be ascribed to the following factors: good light-absorbing, good water transport, and suitable surface morphology. [12,15,48,51,52] Water collection rate was measured to be 1.5 kg m −2 h −1 with a efficiency of 51.7% via a lab-made device with duel-function of vapor condensation and water storage. [24] We also studied the solar evaporation performance of M-Still after soaking into NaCl solution with various concentrations.…”

Section: High-performance Solar-driven Water Evaporationmentioning

confidence: 99%

“…[6][7][8][9][10] Compared with traditional water purification methods, solar-driven water evaporation is considered to be a promising technology and can realize practical seawater desalination, brine purification, or polluted water remediation. [11][12][13][14][15][16] In a typical solar evaporation, high efficiency solar-thermal conversion, good heat confinement, and salt blockage is three major requirements for achieving efficient solar water evaporation. [17][18][19] Although many efforts have been devoted onto development of solar evaporators to improve the evaporation efficiency, salt from seawater would unavoidably accumulate on the interface of evaporator in the process of seawater desalination.…”

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confidence: 99%

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Aligned Millineedle Arrays for Solar Power Seawater Desalination with Site‐Specific Salt Formation

Huang

Wei

Wan

et al. 2021

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With the global environment worsening, water purification technologies for clean water collection especially from seawater or wastewater have drawn huge research enthusiasms in the past few decades. [6][7][8][9][10] Compared with traditional water purification methods, solar-driven water evaporation is considered to be a promising technology and can realize practical seawater desalination, brine purification, or polluted water remediation. [11][12][13][14][15][16] In a typical solar evaporation, high efficiency solar-thermal conversion, good heat confinement, and salt blockage is three major requirements for achieving efficient solar water evaporation. [17][18][19] Although many efforts have been devoted onto development of solar evaporators to improve the evaporation efficiency, salt from seawater would unavoidably accumulate on the interface of evaporator in the process of seawater desalination. [20][21][22][23][24][25] This resulted salt crystal will severely reduce solar absorption and also block the water supply, leading inefficient solar energy conversion and water transport. [26][27][28][29][30] Therefore, anti-salt accumulation of solar evaporation is a critical issue but remains challenging.To address the issue of salt accumulation, recent efforts have been closely paid to receive high-efficient and continuable solar still. Hu and co-works designed an anti-salt solar evaporator by vertically installing large-caliber channel array into the evaporator, and by which the high-concentration salt water on the evaporation interface could availably transport into the nearby channel via osmotic pressure mechanism. [31][32][33][34] On the other hand, "Janus" solar stills with a upper hydrophobic layer and lower hydrophilic layer have also been developed to confine salt crystallization in hydrophilic layer and then dissolute the salt crystal along the water pumping. [35][36][37] Many other strategies, such as self-clean nanoarchitecture, ion-pumping layer, and vertically aligned vessel, have been well developed for resolving salt blockage issue. [38][39][40][41][42] Although all these methods do control salt formation for some extents, water evaporation efficiency is often compromised. [43] Notably, recent reports found that salt crystallization on the edge of evaporator could effectively refrain the salt interference and maintain the efficiency of water evaporation. [44][45][46] Thus, confining salt crystallization at customized sites offers a viable approach for simultaneously realize highperformance water evaporation and precise salt harvesting.In this work, we demonstrate rational design of a millineedle array-patterned 3D solar still for site-specific salt crystallization As a sustainable and clean water production technology, solar thermal water evaporation has been extensively studied in the past few years. One challenge is that upon operation, salt would form on surface of the solar absorbers leading to inefficient water supply and light absorption and thus much reduced water vaporization rate. To address t...

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Section: High-performance Solar-driven Water Evaporationmentioning

confidence: 99%

mentioning

confidence: 99%

Aligned Millineedle Arrays for Solar Power Seawater Desalination with Site‐Specific Salt Formation

Huang

Wei

Wan

et al. 2021

Small

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“…Therefore, it is imperative to develop effective technologies to generate fresh water from seawater or sewage. [1][2][3] Among all of the water treatment technologies, solar-driven evaporation has attracted extensive research attention due to the environment-friendly and renewable characteristics of solar energy. 4 Recently, solar-driven interfacial water evaporation, which minimizes thermal dissipation and applies most of the heat to the liquid-vapor phase transition by concentrating heat at the water-air interface, has been developed to improve the evaporation efficiency of water.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Hydrophilic Porous Photothermal Membranes for Durable and Highly Efficient Solar-Driven Interfacial Water Evaporation

Weng

et al. 2022

CCS Chem

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It is highly desirable to develop a solar-driven interfacial water evaporator with a self-healing ability and highefficiency water evaporation performance for water distillation and desalination, but it is still considerably challenging. Herein, by exploiting the advantages of the self-healing hydrophilic polymer, a self-healing hydrophilic porous photothermal (SHPP) membrane is fabricated by the curing of a mixture of a self-healing hydrophilic polymer, carbon black, and NaCl, followed by the removal of NaCl in water. As the SHPP membrane can simultaneously serve as a photothermal layer and water transportation channel, a solar-driven interfacial evaporator can be readily fabricated by the assembly of the SHPP membrane with a polyethylene foam. The SHPP membrane-based evaporator exhibits a water evaporation rate of 1.68 kg m -2 h -1 and an energy efficiency of 97.3%. These values are superior to those obtained using solar-driven interfacial evaporators with a selfhealing capability. Notably, by reforming hydrogen bonds between fracture surfaces, the SHPP membrane can regain its structural integrity after breaking, making the SHPP membrane-based evaporator the first evaporator that can completely and repeatedly heal water evaporation capacity after physical damage. Herein, the potential of SHPP membranes for developing stable, long-lasting, and high-efficiency solar-driven interfacial water evaporators is highlighted.

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“…Water scarcity is pushing the revolution of efficient purification technologies. Membrane separation, including reverse osmosis [ 1 , 2 ], nanofiltration (NF) [ 3 , 4 , 5 , 6 ], ultrafiltration [ 7 , 8 , 9 ], distillation [ 10 , 11 , 12 ] and forward osmosis [ 13 , 14 ], has been considered as one of the most reliable technologies for water purification [ 15 , 16 , 17 , 18 ]. Among these, NF has prevailed in seawater desalination, wastewater treatment and advanced water purification, due to its high selectivity and moderate cost of operation.…”

Section: Introductionmentioning

confidence: 99%

Organic Nanobowls Modified Thin Film Composite Membrane for Enhanced Purification Performance toward Different Water Resources

Wang

et al. 2021

Membranes

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The structure and composition of nanofillers have a significant influence on polyamide nanofiltration (NF) membranes. In this work, an asymmetric organic nanobowl containing a concave cavity was synthesized and incorporated into a polyamide layer to prepare thin film nanocomposite (TFN) membranes via an interfacial polymerization process. Benefiting from the hydrophilicity, hollow cavity and charge property of the compatible organic nanobowls, the separation performance of the developed TFN membrane was significantly improved. The corresponding water fluxes increased to 119.44 ± 5.56, 141.82 ± 3.24 and 130.27 ± 2.05 L/(m2·h) toward Na2SO4, MgCl2 and NaCl solutions, respectively, with higher rejections, compared with the control thin film composite (TFC) and commercial (CM) membranes. Besides this, the modified TFN membrane presented a satisfying purification performance toward tap water, municipal effluent and heavy metal wastewater. More importantly, a better antifouling property of the TFN membrane than TFC and CM membranes was achieved with the assistance of organic nanobowls. These results indicate that the separation performance of the TFN membrane can be elevated by the incorporation of organic nanobowls.

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Porous evaporators with special wettability for low-grade heat-driven water desalination

Abstract: Against the backdrop of global water scarcity, porous interface distillation (PID) working on macroporous evaporation materials is attracting ever-growing attention in sustainable desalination. It excels itself in the ability to...

Cited by 73 publications

References 262 publications

Aligned Millineedle Arrays for Solar Power Seawater Desalination with Site‐Specific Salt Formation

Aligned Millineedle Arrays for Solar Power Seawater Desalination with Site‐Specific Salt Formation

Self-Healing Hydrophilic Porous Photothermal Membranes for Durable and Highly Efficient Solar-Driven Interfacial Water Evaporation

Organic Nanobowls Modified Thin Film Composite Membrane for Enhanced Purification Performance toward Different Water Resources

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