An Overview to Hydrogen Peroxide: Properties, Formula & Uses

What Is Hydrogen Peroxide?

Hydrogen peroxide is a colorless, viscous liquid with a slightly pungent odor. It is relatively stable in the dark but decomposes easily into oxygen and water when exposed to heat, light, or certain impurities. It is miscible with water in any proportion.
Since the oxidation state of hydrogen peroxide is -1, it can serve as a (strong) oxidizing agent, a (weak) reducing agent, and a bleaching agent. It is widely used in inorganic synthesis (e.g., the production of sodium perborate), organic synthesis (e.g., the production of peracetic acid), medical disinfection, clinical chemistry, textile bleaching, and food testing. It possesses strong oxidizing properties, and its oxidizing power is significantly higher in acidic solutions than in alkaline solutions. When used as an oxidizing agent, the primary byproduct is water, and no toxic waste is generated. Hydrogen peroxide can also be produced via electrolysis, typically under strong acidic or strong basic conditions; the product must be purified.

Hydrogen Peroxide Properties

Industrial Production Method of Hydrogen Peroxide: Stretford 

In the anthraquinone method, anthraquinone is dissolved in an organic solvent to form a working solution. Under specific pressure and temperature, and in the presence of a catalyst such as palladium (Pd), anthraquinone is hydrogenated by H₂ to form hydroanthraquinone and tetrahydrohydroanthraquinone. Anthraquinone and tetrahydroanthraquinone are then auto-oxidized with O₂ under specific temperature and pressure conditions to produce H₂O₂, anthraquinone, and tetrahydroanthraquinone. Finally, through processes such as extraction, regeneration, purification, and concentration, a 20%–50% aqueous solution of H₂O₂ is obtained.

Although the catalysts used in the anthraquinone process are prone to poisoning, caking, and fragmentation, and the process involves numerous side reactions that make separation and purification burdensome, the anthraquinone catalyst can be recycled and simply replenished as needed. Furthermore, the anthraquinone process for producing H₂O₂ utilizes inexpensive and readily available raw materials from a wide range of sources. Since H₂ and O₂ do not come into direct contact, the risk of explosion is effectively avoided, making this method suitable for large-scale production.

Hydrogen Peroxide Formula

What is hydrogen peroxide usually used for?

Medical Disinfection

Given that hydrogen peroxide has the characteristics of low stimulation, high efficiency, quick action, and non-toxicity, a 3% concentration of hydrogen peroxide solution can be used as an oxidative disinfectant. When it comes into contact with organic matter, it can be decomposed by catalase to produce oxygen, thereby playing a role in sterilization, deodorization, decontamination, and hemostasis. It can also destroy the anaerobic environment where tetanus bacteria grow, thereby preventing the occurrence of tetanus symptoms. It can also be used for anti-inflammatory or cleaning of external ear canal inflammation, tonsillitis, emergency trauma debridement surgery, etc.

Oxygen Preparation

Due to the easy decomposition of hydrogen peroxide, oxygen is produced in the laboratory by adding a manganese dioxide (MnO₂) catalyst to the hydrogen peroxide solution.

Textile Bleaching Applications

In industry, hydrogen peroxide is widely used for bleaching substances such as cotton fabrics, raw silk, wool, fur, feathers, animal bones, ivory, fat, pulp, and tombstones.

FAQs

1. Can hydrogen peroxide expire​?

Yes, hydrogen peroxide will expire, and it is not recommended to continue using it after expiration, especially in critical applications such as wound disinfection. The shelf life of unopened 3% medical hydrogen peroxide is usually 1-3 years, but the shelf life is shorter after opening, and it is generally recommended to use it within 1 month.

2. Does hydrogen peroxide kill germs?

Hydrogen peroxide is a strong oxidant that can effectively kill various bacteria under certain concentrations and operating conditions, but its bactericidal effect is affected by concentration, operating time, temperature, pH value, and bacterial species.

3. Does hydrogen peroxide kill mold​?

Hydrogen peroxide is a broad-spectrum and highly efficient disinfectant that has a killing effect on various molds (such as Aspergillus and Penicillium). Its sterilization principle is to decompose and release reactive oxygen species, which destroy the cell membrane, proteins, and genetic material of molds, thereby inhibiting their reproduction.

4. Is bleach or hydrogen peroxide less toxic to humans?

Bleaches (such as reactive oxygen bleach containing hydrogen peroxide) are usually harmless to the human body when used correctly and at low concentrations but can be highly toxic when used improperly or at high concentrations and may cause damage to the skin, mucous membranes, respiratory tract, and digestive tract.

5. Is hydrogen peroxide rubbing alcohol?

It is not recommended to directly rub or mix hydrogen peroxide and alcohol (ethanol or isopropanol), as they can undergo a chemical reaction, reduce disinfection effectiveness, and may cause skin irritation or safety hazards.

6. isopropyl alcohol vs hydrogen peroxide

Isopropanol (C₃H₈O) and hydrogen peroxide (H₂O₂) are two substances with completely different chemical properties and uses, but they can react under specific conditions.

Isopropanol: solvent, disinfectant, fragrance synthesis, paint dilution, etc.

Hydrogen peroxide: bleaching, disinfection, oxidation reaction, oxygen preparation, etc.