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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Copper sulfide integrated functional cellulose hydrogel for efficient solar water purification.

Zhongguo Wang1, Xiong-Fei Zhang2, Lian Shu1

  • 1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.

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|August 11, 2023
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Summary

This study developed a novel cellulose hydrogel solar evaporator using copper sulfide (CuS) for efficient solar steam generation. The material achieved a high evaporation rate and solar-to-vapor efficiency, demonstrating its potential for water purification.

Keywords:
Cellulose hydrogelCuSPhotocatalytic water purificationSolar desalination

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Water scarcity is a global challenge, driving the need for efficient solar steam generation technologies.
  • Hydrogels offer promising platforms for solar evaporation due to their unique properties.
  • Developing sustainable and cost-effective materials is crucial for practical applications.

Purpose of the Study:

  • To fabricate a novel solar steam evaporator using cellulose hydrogel integrated with copper sulfide (CuS).
  • To investigate the performance of the composite hydrogel for solar steam generation and water purification.
  • To evaluate the material's efficiency, durability, and photocatalytic activity.

Main Methods:

  • Regenerating cellulose from cotton linter using NaOH/urea solvent.
  • Cross-linking cellulose with epichlorohydrin to enhance mechanical properties.
  • Integrating copper sulfide (CuS) semiconductor nanoparticles into the cellulose hydrogel matrix.
  • Characterizing the composite hydrogel's structure, morphology, and optical properties.
  • Evaluating solar steam generation performance under simulated solar irradiation.
  • Assessing the photocatalytic degradation of organic pollutants.

Main Results:

  • The fabricated cellulose-CuS composite hydrogel exhibited excellent light absorption and efficient photothermal conversion.
  • Optimized hydrogel achieved a high solar-to-vapor conversion efficiency of 87% and an evaporation rate of 2.2 kg/m²h under 1 sun irradiation.
  • The material demonstrated remarkable durability, maintaining high evaporation rates after 48 hours of continuous irradiation.
  • The hydrogel showed significant photocatalytic activity, degrading 95% of methylene blue and 92% of Rhodamine B.

Conclusions:

  • The developed cellulose-CuS hydrogel is a highly efficient and durable material for solar steam generation.
  • This functional hydrogel holds significant potential for addressing water scarcity through solar-driven water purification.
  • The material's dual functionality (evaporation and photocatalysis) broadens its applicability in environmental remediation.