Interaction Promotes the Formation and Photothermal Conversion of Carbon Dots/Polydopamine Composite for Solar‐Driven Water Evaporation

Chang, Qing; Guo, Zhiqiang; Shen, Zhuohao; Li, Ning; Xue, Chaorui; Zhang, Huinian; Hao, Caihong; Yang, Jinlong; Hu, Shengliang

doi:10.1002/admi.202100332

Cited by 18 publications

(25 citation statements)

References 41 publications

(21 reference statements)

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“…Compared to CND-OD and water only, CND-FD shows a superior water evaporation rate of 2.20 kg/m 2 .h under one sun, which is 2.3 times that of CND-OD and 3.3 times that of water only under the same evaporation condition. The evaporation rate in this work is comparable with some of the recently developed carbon dots for solar evaporation systems that reported water evaporation rates in the range of 1.82-2.31 kg/m 2 .h [9,32,38]. The calculated evaporation efficiencies of CND-FD and CND-OD were 84% and 36%, respectively.…”

Section: Photothermal Propertiessupporting

confidence: 83%

“…Their outstanding photoluminescence and intrinsic IOP Publishing doi:10.1088/1755-1315/1017/1/012009 2 catalytic properties have been utilized in photocatalytic and dye-sensitized solar cells [4][5][6]. In the last four years, CNDs have also been investigated as solar absorbers for solar steam generation or solar water evaporation system [7][8][9][10]. Not only consist of carbon, hydrogen and oxygen atoms, the core of CNDs can also comprise of nitrogen, sulphur, boron, and phosphorus atoms, depending on the precursors [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of post-treatment drying processes on the optical and photothermal properties of carbon nanodots derived via microwave-assisted method

Indriyati

Munir

Nasir³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Carbon nanodots (CNDs) are considered as potential materials for photothermal applications and can be used as solar absorbers to enhance the absorption and conversion efficiency of solar energy to heat. To meet the criteria as solar absorbers, CNDs were synthesized via microwave heating and dried by two different drying processes, namely freeze drying and oven drying, obtaining CNDs powder with the labeled of CND-FD and CND-OD, respectively. The effect of these two drying methods on the optical and photothermal properties of CNDs was investigated. It was observed that soft and light powders were obtained from freeze drying, while oven drying resulted in shiny and agglomerate particles. Oven drying did not alter the absorption profile of CNDs, but freeze-drying resulted in broader and slightly red-shift absorption compared with that of CNDs colloid before drying. Photoluminescence intensity of CND-FD was only half of that of CND-OD. FTIR analysis revealed that CND-FD contained fewer hydroxyl and hydrophilic amine groups, leading to less hygroscopic nature of CND-FD than CND-OD. Because of its better absorption capability, the presence of CND-FD in water significantly increased the water evaporation rate and evaporation efficiency up to 2.2 kg/m2.h and 84%, respectively, three times higher than that of water without CNDs. With a similar photothermal testing condition, CND-OD resulted in a evaporation rate of only 0.9 kg/m2.h and evaporation efficiency of 36%. It can be noticed that freeze drying is more suitable to dry CNDs powder over oven drying to obtain excellent optical and photothermal properties of CNDs.

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Section: Photothermal Propertiessupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effect of post-treatment drying processes on the optical and photothermal properties of carbon nanodots derived via microwave-assisted method

Indriyati

Munir

Nasir³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Due to this phenomenon, comparatively less energy is required for water molecules to escape the surface. 31 …”

Section: Results and Discussionmentioning

confidence: 99%

“…Due to this phenomenon, comparatively less energy is required for water molecules to escape the surface. 31 The photothermal conversion efficiency of HFLA is calculated by the given formula (1). 32…”

Section: Resultsmentioning

confidence: 99%

Complete System to Generate Clean Water from a Contaminated Water Body by a Handmade Flower-like Light Absorber

et al. 2021

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The utilization of solar energy to make human lives better has been one of the primary and green approaches adopted by ordinary people and researchers for decades. This approach has recently gained a lot of attention as a way to tackle clean water scarcity in remote areas. Costly components, complex manufacturing procedures with rarely available equipment, and a surface to condense water vapors are challenges in the way of its application in the required areas. Here, we propose a complete system to solve this problem with a handmade light absorber and a superhydrophilic surface (antifogging) to get vapors back to collect clean water. Our handmade flower-like light absorber stitched by crochet work, the single stitch method, was able to get a decent evaporation rate of 1.75 kg/m 2 ·h in pure water and slightly lower rates of 1.62 and 1.65 kg/m 2 ·h with brine and pond water, respectively. Still, our proposed superhydrophilic coated surface can collect ∼37% more water than the pristine surface. This system has a huge potential for use in rural areas because of multiple key advantages, such as simple technology, readily available low-cost raw materials, and easy fabrication.

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“…In this work, we evaluated the solar‐driven water evaporation performance of HPSA‐supported carbon dots/polydopamine (CDs/PDA) photothermal material that was developed in our previous study. [ 48 ] The bonding between CDs/PDA and HPSA was accomplished by the electrostatic interaction between negative potential CDs/PDA and the positive potential of HPSA (Figure S7, Supporting Information). And the loading content of CDs/PDA on HPSA was optimized at 5.73 mg cm –2 (Figure S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Pore‐Gradient Silica Aerogel Balancing Heat and Water Management for Efficient Solar‐Driven Water Evaporation

Zhang

Chang

et al. 2022

Advanced Sustainable Systems

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Efficient heat and water management are two essential aspects for enhancing solar‐driven water evaporation. Here, an efficient strategy to synchronously achieve desired heat and water management based on hierarchical pore‐gradient silica aerogel (HPSA) support that consists of large‐pores at top regions, small‐pores at bottom regions, and a porous wall constructed by mesoporous silica nanoparticles is demonstrated. The small‐pores at bottom regions enable capillary pumping capability, while the large‐pores at the top regions strengthen light capture and facilitate water/vapor transport. Additionally, the random distribution of super‐large pores and the porous wall further promote water supply and diffusion. The unique nanostructure enables the conceived HPSA to show desirable advantages of minimized heat loss, fast water transport, and reduced water evaporation enthalpy. After coating with the photothermal material of carbon dots/polydopamine, a high evaporation rate of 1.95 kg m–2 h–1 under 1 sun is achieved for the HPSA evaporator, which exhibits significant superiority in promoting solar‐driven water evaporation efficiency compared to a balsa wood and melamine sponge evaporator. In addition, the designed HPSA evaporator presents high recyclability and excellent salt resistance capacity in high‐salinity brine (15 wt%), holding great promise for practical solar‐driven water evaporation applications.

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Interaction Promotes the Formation and Photothermal Conversion of Carbon Dots/Polydopamine Composite for Solar‐Driven Water Evaporation

Cited by 18 publications

References 41 publications

Effect of post-treatment drying processes on the optical and photothermal properties of carbon nanodots derived via microwave-assisted method

Effect of post-treatment drying processes on the optical and photothermal properties of carbon nanodots derived via microwave-assisted method

Complete System to Generate Clean Water from a Contaminated Water Body by a Handmade Flower-like Light Absorber

Hierarchical Pore‐Gradient Silica Aerogel Balancing Heat and Water Management for Efficient Solar‐Driven Water Evaporation

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