1、Advances and challenges in humic acid production technologies from

Various methods are analyzed, including extraction techniques, catalytic oxidation processes, microbial activation, hydrothermal conversion routes, and solid-phase mechano-activation methods.

2、Humic acid: research progress in its structural properties, sources

However, the formation of natural humic acid takes a long time, so the synthesis of humic acid by the artificial methods is considered to be an excellent value-added method. This study reviews the research progress in structural properties, sources, preparation and applications of humic acids.

3、A COMPREHENSIVE REVIEW OF HUMIC ACID PRODUCTION

This paper provides a detailed review of humic acid production technologies in China, focusing on both natural extraction and artificial synthesis methods.

4、Artificial Humic Acids: Sustainable Materials against Climate Change

Without doubt, humic matter is well‐explored in geochemistry and soil science, but a pure chemical lab‐synthesis of HAs, their chemical modification, and their valorization as an advanced polymer material is largely missing.

Technology for Production of Humic Preparations

When developing the technology for industrial production of humic preparations, the following research methods were used: analytical, comparative, information-logical analysis of initial information, rated and constructive, expert assessments, a computer modeling method.

Advances and challenges in humic acid production

Various methods are analyzed, including extraction techniques, catalytic oxidation processes, microbial activation, hydrothermal conversion routes, and solid-phase mechano-activation methods.

Synthesis of humic acid with the obtaining of potassium h

The synthesis of humic acids with the production of potassium humate is aimed at reducing the accumulated industrial waste, which in turn allows you to regulate and improve the ecological situation and green ecology in the region.

Advancing humic acids extraction procedures: A review of methods

The primary sources for humic acids extraction include lignite and leonardite, while common extraction methods involve alkaline extraction followed by acid precipitation, along with other emerging techniques such as hydrothermal, enzymatic, and microwave-assisted methods.

Directed Synthesis of Humic and Fulvic Derivatives with Enhanced

In this work, hydroquinonoid and hydronaphthoquinonoid centres were used, which possess very different redox characteristics. They were incorporated into the structure of coal (leonardite) humic acids CHA) and peat fulvic acids (PFA). For this goal, an oxidative copolymerization of phenols was used.

A comprehensive review of humic acid production

This paper provides a detailed review of humic acid production technologies in China, focusing on both natural extraction and artificial synthesis methods. Natural extraction primarily involves the use of low-rank coals such as lignite and weathered coal, while artificial synthesis includes biological composting, chemical oxidation, and ...

The synthesis methods of humic acid mainly include the following types:

1. Natural Method: This approach relies on the natural decomposition of plants to produce humic acid. Its advantage lies in preserving the natural properties of humic acid, but it results in low yield and requires a long duration.

2. Chemical Method: Humic acid is synthesized through chemical reactions. This method allows for rapid mass production, but it may alter the structure and properties of humic acid.

3. Biological Method: Microbial metabolic activities drive the synthesis of humic acid. It enables large-scale production without environmental pollution.

4. Physical Method: Physical separation and purification techniques extract humic acid. While effective, this method might damage its structural integrity.

5. Hybrid Method: Combines multiple methods above to optimize outcomes. It leverages the strengths of various approaches but may increase production costs.

6. Enzyme-Catalyzed Method: Specific enzymes catalyze the synthesis of humic acid. This allows controlled reaction rates and directions, but enzyme activity and stability pose limitations.

7. Electrochemical Method: Based on electrochemical principles, this method produces high-purity humic acid, though equipment costs are significant.

8. Photocatalytic Method: Light energy drives the synthesis of humic acid. While energy-efficient, it may generate byproducts.

9. Pyrolysis Method: High-temperature treatment of organic matter synthesizes humic acid. It yields substantial energy but produces harmful gases and solid waste.

10. Supercritical Fluid Method: Utilizes supercritical fluids to synthesize humic acid. This allows precise control over reaction conditions, but equipment costs are high.

Each method has distinct advantages and disadvantages. The choice depends on practical requirements and specific application scenarios.