1、Degradative catalyst solvent extraction and oxidative cracking in humic

It promotes the cross-linking condensation of humic acid molecules into larger molecular weight, insoluble components, ultimately resulting in decreased humic acid yield.

2、(PDF) UV/Advanced Oxidation Process for Removing Humic Acid from

Humic acid (HA) is an organic compound naturally present in aquatic environments. It has been found to have detrimental effects on water color, the transport of heavy metals, and the...

3、FRACTIONATION OF HUMIC ACID BY ORGANIC SOLVENTS

We examined the solubility of humic acid in many organic solvents, and found that some humic acids had the property to dissolve con siderably in acetone and benzene-alcohol mix ture and give the solution a dark brownish color.

4、昆明理工大学材料学科2016

Yang, Suspension of carbon nanotubes in natural humic acid water, NEW CARBON MATERIALS, 32 (2017) 252-257. [459] D. Wu, Y. Mao, J. Deng, S. Wen, Activation mechanism of ammonium ions on sulfidation of malachite (-201) surface by DFT study, Appl Surf Sci, 410 (2017) 126-133.

A review of advancements in humic acid removal: Insights into

A range of adsorbents can be employed for HA removal, including modified membranes, carbon nanotubes (CNTs), clay nanoparticles, and acid-modified natural materials. This work compares the effectiveness of the preceding adsorbents along with their advantages and limitations.

Eco

The main criterion for dividing humic acids into humic, hymatomelanic, and fulvic acids is pri-marily their diferent solubility in water, acids, alkalis, and ethanol.

Process Condition Optimization and Structural Feature Analysis of Humic

Currently, the alkali-dissolution and acid-precipitation methods are primarily used to extract humic acid from organic substances such as coal. This method leverages the fact that humic acid is soluble in alkali but insoluble in acid.

Advancing humic acids extraction procedures: A review of methods

Humic acid has applications in agriculture, water treatment, and many industries. This paper provides a review of various methods for extracting humic acids from coal, focusing on their efficiency, and environmental challenges.

Removal of humic acid from aqueous solutions by a novel hydrogarnet

Removal of humic acid from aqueous solutions is pivotal to protect water from environmental and health concerns. Slurry consisting of silica gel, alumina, calcium hydroxide, and zeolite A was hydrothermally treated to prepare a hydrogarnet/zeolite composite for humic acid removal from water.

Prospects for humic acids treatment and recovery in wastewater: A

Physicochemical treatments including filtration and oxidation are basic and key approaches to removing humic acids. Biological treatments including enzyme and fungi-mediated humic acids degradation are economically feasible but require some scalability.

Organic humic acid is a natural macromolecular compound widely found in soil, water bodies, and living organisms. It offers various functions, such as improving soil structure, enhancing fertilizer efficiency, and regulating pH levels. Solvent treatment of organic humic acid aims to extract its active components and elevate its application value. The following are the detailed steps:

1. Raw Material Preparation: Sufficient organic humic acid raw materials, such as soil, animal/plant residues, or other organic matter, must be prepared. Ensure the quality and purity of the raw materials to obtain high-quality products.

2. Pretreatment: Preprocess the organic humic acid through crushing, grinding, and sieving to facilitate subsequent extraction.

3. Extraction: Mix the pretreated organic humic acid with an appropriate amount of water and heat to a specific temperature (typically between 60–80°C) to dissolve the active components into the water. This process is called extraction.

4. Separation: Remove insoluble impurities and excess water from the extracted product using methods like centrifugation, filtration, or precipitation.

5. Purification: Further purify the extract through evaporation, crystallization, or adsorption to increase the concentration and purity of active components.

6. Drying: Dry the purified organic humic acid to remove residual moisture. Common drying methods include spray drying or freeze drying.

7. Packaging: Package the dried organic humic acid for storage and use.

Key Considerations:

1. Temperature Control: The extraction temperature significantly impacts the release of active components. Extreme temperatures may cause loss of efficacy, so precise temperature regulation is critical.

2. Time Management: Excessive extraction time may lead to overloss of active components, while insufficient time may result in incomplete extraction. Adjust duration based on specific conditions.

3. Separation and Purification: Choose appropriate equipment and methods to ensure effective separation and purification of active components.

4. Drying: Maintain optimal temperature and humidity during drying to prevent degradation of active components.

5. Packaging: Ensure airtight and moisture-proof packaging to preserve product quality.

following these steps enables efficient extraction and purification of organic humic acid, yielding high-quality products. These products hold significant economic and social value in agriculture, forestry, environmental protection, and other fields.