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Formaldehyde (HCHO) is a widespread water-soluble toxic pollutant, which mainly originates from industrial production emissions, volatilization of building and decoration materials, and the release of daily necessities. This compound is strongly carcinogenic and biotoxic, which will not only cause serious damage to the human respiratory system and immune system, but also destroy the ecological balance of the water body. Therefore, the development of efficient formaldehyde removal technology is of great significance for the protection of human health and the maintenance of ecosystem stability. The existing formaldehyde degradation methods mainly include adsorption technology, biodegradation method and catalytic oxidation method, among which catalytic oxidation method has become the key direction of the current research due to its advantages of complete degradation and no secondary pollution.

Calcite-type oxides (ABO?), with unique crystal structures, excellent electronic conductivity and stable catalytic activity, have made remarkable progress in multiphase catalysis such as CO oxidation and volatile organic compound degradation. As a typical chalcogenide material, lanthanum cobalt oxide (LaCoO?) has a potential oxidation catalytic ability due to the valence tunability of its active component cobalt (Co). However, there are relatively few studies on the degradation of formaldehyde in water by LaCoO?, and the mechanism of its catalytic activity and reaction pathway are not yet fully understood.

Based on the above background, in this study, chalcogenide LaCoO? catalysts with different lanthanum to cobalt molar ratios were prepared by the sol-gel method, and the catalytic degradation of formaldehyde in water was systematically investigated at room temperature, and the catalytic mechanism was also revealed by the combination of the material characterization technique and the free radical burst experiments. The results of catalytic performance tests showed that the prepared LaCoO? catalysts exhibited excellent formaldehyde degradation activity. Compared with the traditional non-homogeneous catalysts (e.g., transition metal oxides, noble metal-loaded catalysts, etc.), the formaldehyde degradation time was shortened from 119 min to 10 min, and the degradation efficiency was improved by 12 times. The best degradation activity was achieved when the lanthanum to cobalt molar ratio was 1:1, and the complete removal of formaldehyde from water could be realized in 10 min at room temperature, and the degradation rate remained above 95% after 3 times of reuse, which showed good stability.

In order to elucidate the intrinsic reasons for the differences in catalytic activity, the surface electronic states of the catalysts with different lanthanum-cobalt molar ratios were analyzed in this study using X-ray photoelectron spectroscopy (XPS). The results showed that the relative content of Co2? on the catalyst surface gradually decreased with the increase of lanthanum-cobalt molar ratio, while the content of Co3? increased accordingly. Combined with the catalytic performance data, it can be found that the formaldehyde degradation activity of the catalyst is positively correlated with the Co2? content, indicating that Co2? is the key active site to promote the oxidative degradation of formaldehyde, and participates in the redox reaction through the Co2?/Co3? valence cycle. reaction, accelerating the generation of active species.

In order to identify the main active species during the reaction process, this study further conducted free radical bursting experiments by adding sulfate radical (SO??-) bursting agent (anhydrous ethanol) and hydroxyl radical (?OH) bursting agent (tert-butanol) to the reaction system, respectively. The experimental results showed that the addition of both bursting agents significantly inhibited the degradation efficiency of formaldehyde, in which the degradation rate decreased by 681 TP3T with the addition of anhydrous ethanol and 521 TP3T with the addition of tert-butanol, which confirms that SO??- and ?OH are the main active species in the degradation of formaldehyde. Based on the above results, the present study proposed that the reaction mechanism of LaCoO?-catalyzed formaldehyde degradation is a non-homogeneous Fenton-like oxidation reaction: Co2? on the catalyst surface reacts with oxidants in the system (e.g., dissolved oxygen, hydrogen peroxide, etc.) to form SO??- and?OH, which then oxidizes formaldehyde into CO? and?OH through strong oxidative action. Formaldehyde is oxidized and decomposed into CO? and H?O.

In this study, the potential application of chalcogenide LaCoO? in formaldehyde degradation in water was confirmed for the first time, the mechanism of lanthanide-cobalt molar ratio on the catalytic activity was clarified, and the reaction pathway of non-homogeneous Fenton-like oxidation was revealed, which provided the theoretical basis and technical reference for the development of highly efficient and stable catalysts for formaldehyde degradation at room temperature.

Magnetization of Magnetic Materials

3C Electronic Magnetization

Motor Rotor Magnetization

Car Speaker Magnetization

New Energy Vehicle Industry

Medical Equipment Industry

JiuJu Magnetization Case: Record of the whole process of magnetizing silicone magnetic products

February 25, 2026

Automated Magnetic Charging Integrated Solution Magnetic Charging Equipment Magnetic Charging Automation Magnetic Measuring Instruments Magnetic Charging Service In the industrial manufacturing field, silicone magnetic products are widely used in smart wear and sealing components because of their flexibility and magnetic properties. The core of their magnetic properties depends on professional magnetization process. This time, JiuJu magnetization undertakes the project of magnetizing silicone products, and successfully realizes the product's magnetic force from 0.01 gauss to 15.5 gauss by leaps and bounds, the following is the whole process detail...

JiuJu Magnetic Stripe Magnetization Video Case: Medical Magnetic Stripe Magnetization

January 7, 2026

Automated Magnetic Charging Integrated Solution Magnetic Charging Equipment Magnetic Charging Automation Magnetic Measuring Instruments Magnetic Charging Services Magnetic stripes are widely used in medical cards, medical insurance cards and other medical credentials to store key data such as basic patient information and medical insurance participation information. Due to the frequency of use and the external environment, the magnetic stripe may become magnetically weakened or demagnetized, resulting in the inability of the equipment to read the information, and then need to be magnetized. The core principle of magnetization is to make the magnetic strip inside the...

JiuJu Magnetizing Video Case: Rubber Silicone and NdFeB Magnetizing

January 6, 2026

Automated Magnetic Charging Integrated Solution Magnetic Charging Equipment Magnetic Charging Automation Magnetic Measuring Instruments Magnetic Charging Service This paper focuses on the core process of magnetization of Rubber Silicone and NdFeB, the initial state of non-magnetic before magnetization, and the magnetic performance after magnetization. Through the gaussmeter measurement verification, it is clear that the highest magnetic unit after magnetization is up to 45.9 units and the highest magnetic unit after magnetization is up to 45.9 units (measured by gaussmeter). The magnetization process is the core link to realize the magnetic transformation of the two...

Precision Magnetization for Ferrite Cubes

November 13, 2025

Specializing in ferrite cube micro-magnetization, we deliver customized, precise solutions tailored to ferrite cube material properties. By fine-tuning parameters, we ensure the magnetization meets exact standards, fulfilling high-precision magnetic requirements and adapting to applications with strict demands for magnetization accuracy.

Motor magnetizer: what core indicators should be most concerned about when the factory selection

March 5, 2026

Motor magnetizer: what core indicators should be most concerned about when the factory selection

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

February 27, 2026

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

An article to read: the principle of motor magnetization, the need and the underlying logic of permanent magnet motors

February 26, 2026

Automated Magnetic Charging Integrated Solution Magnetizing Equipment Magnetizing Automation Magnetic Measuring Instruments Magnetizing Service Magnetizing is the core step in the manufacture and maintenance of permanent magnet motors such as permanent magnet synchronous motors (PMS) and brushless DC motors (BDC). It relies on the principle of electromagnetic induction and magnetic field energy conversion, with the help of external strong magnetic field to make the internal magnetic domains of permanent magnets arranged in a directional manner, so as to form stable and long-lasting magnetism, which is the basic link to ensure the normal operation of the motor. First, the essence of magnetization: to give the motor...

Spring Ushers in a New Journey, Action Drives New Chapters｜JIUJU Automation Kicks Off 2026 with Success

February 25, 2026

Magnetizing Equipment | Magnetizing Automation | Magnetic Measuring Instruments | Magnetizing Services Spring Returns, Unveiling a New Chapter — Setting Sail on a New Journey On the eighth day of the first lunar month of 2026, an auspicious day to commence work in the new year, JIUJU Automation was filled with warmth and vitality. Having set aside the leisurely pace of the Spring Festival, all employees gathered at the facility with full enthusiasm and high spirits, collectively embarking on the journey of hard work for the new year. They are committed to upholding their original aspirations through practical action and striving to write a new chapter of glory with dedicated effort. At 8:00 AM sharp...

Motor magnetizer: what core indicators should be most concerned about when the factory selection

March 5, 2026

Motor magnetizer: what core indicators should be most concerned about when the factory selection

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

February 27, 2026

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

An article to read: the principle of motor magnetization, the need and the underlying logic of permanent magnet motors

February 26, 2026

Automated Magnetic Charging Integrated Solution Magnetizing Equipment Magnetizing Automation Magnetic Measuring Instruments Magnetizing Service Magnetizing is the core step in the manufacture and maintenance of permanent magnet motors such as permanent magnet synchronous motors (PMS) and brushless DC motors (BDC). It relies on the principle of electromagnetic induction and magnetic field energy conversion, with the help of external strong magnetic field to make the internal magnetic domains of permanent magnets arranged in a directional manner, so as to form stable and long-lasting magnetism, which is the basic link to ensure the normal operation of the motor. First, the essence of magnetization: to give the motor...

Spring Ushers in a New Journey, Action Drives New Chapters｜JIUJU Automation Kicks Off 2026 with Success

February 25, 2026

Magnetizing Equipment | Magnetizing Automation | Magnetic Measuring Instruments | Magnetizing Services Spring Returns, Unveiling a New Chapter — Setting Sail on a New Journey On the eighth day of the first lunar month of 2026, an auspicious day to commence work in the new year, JIUJU Automation was filled with warmth and vitality. Having set aside the leisurely pace of the Spring Festival, all employees gathered at the facility with full enthusiasm and high spirits, collectively embarking on the journey of hard work for the new year. They are committed to upholding their original aspirations through practical action and striving to write a new chapter of glory with dedicated effort. At 8:00 AM sharp...

Motor magnetizer: what core indicators should be most concerned about when the factory selection

March 5, 2026

Motor magnetizer: what core indicators should be most concerned about when the factory selection

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

February 27, 2026

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

An article to read: the principle of motor magnetization, the need and the underlying logic of permanent magnet motors

February 26, 2026

Automated Magnetic Charging Integrated Solution Magnetizing Equipment Magnetizing Automation Magnetic Measuring Instruments Magnetizing Service Magnetizing is the core step in the manufacture and maintenance of permanent magnet motors such as permanent magnet synchronous motors (PMS) and brushless DC motors (BDC). It relies on the principle of electromagnetic induction and magnetic field energy conversion, with the help of external strong magnetic field to make the internal magnetic domains of permanent magnets arranged in a directional manner, so as to form stable and long-lasting magnetism, which is the basic link to ensure the normal operation of the motor. First, the essence of magnetization: to give the motor...

Spring Ushers in a New Journey, Action Drives New Chapters｜JIUJU Automation Kicks Off 2026 with Success

February 25, 2026

Magnetizing Equipment | Magnetizing Automation | Magnetic Measuring Instruments | Magnetizing Services Spring Returns, Unveiling a New Chapter — Setting Sail on a New Journey On the eighth day of the first lunar month of 2026, an auspicious day to commence work in the new year, JIUJU Automation was filled with warmth and vitality. Having set aside the leisurely pace of the Spring Festival, all employees gathered at the facility with full enthusiasm and high spirits, collectively embarking on the journey of hard work for the new year. They are committed to upholding their original aspirations through practical action and striving to write a new chapter of glory with dedicated effort. At 8:00 AM sharp...

Motor magnetizer: what core indicators should be most concerned about when the factory selection

March 5, 2026

Motor magnetizer: what core indicators should be most concerned about when the factory selection

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

February 27, 2026

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

An article to read: the principle of motor magnetization, the need and the underlying logic of permanent magnet motors

February 26, 2026

Automated Magnetic Charging Integrated Solution Magnetizing Equipment Magnetizing Automation Magnetic Measuring Instruments Magnetizing Service Magnetizing is the core step in the manufacture and maintenance of permanent magnet motors such as permanent magnet synchronous motors (PMS) and brushless DC motors (BDC). It relies on the principle of electromagnetic induction and magnetic field energy conversion, with the help of external strong magnetic field to make the internal magnetic domains of permanent magnets arranged in a directional manner, so as to form stable and long-lasting magnetism, which is the basic link to ensure the normal operation of the motor. First, the essence of magnetization: to give the motor...

Spring Ushers in a New Journey, Action Drives New Chapters｜JIUJU Automation Kicks Off 2026 with Success

February 25, 2026

Magnetizing Equipment | Magnetizing Automation | Magnetic Measuring Instruments | Magnetizing Services Spring Returns, Unveiling a New Chapter — Setting Sail on a New Journey On the eighth day of the first lunar month of 2026, an auspicious day to commence work in the new year, JIUJU Automation was filled with warmth and vitality. Having set aside the leisurely pace of the Spring Festival, all employees gathered at the facility with full enthusiasm and high spirits, collectively embarking on the journey of hard work for the new year. They are committed to upholding their original aspirations through practical action and striving to write a new chapter of glory with dedicated effort. At 8:00 AM sharp...

Motor magnetizer: what core indicators should be most concerned about when the factory selection

March 5, 2026

Motor magnetizer: what core indicators should be most concerned about when the factory selection

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

February 27, 2026

JiuJu Magnetization Case - Antique Audio Speaker Magnetization Restoration, Technology and Example Introduction

An article to read: the principle of motor magnetization, the need and the underlying logic of permanent magnet motors

February 26, 2026

Automated Magnetic Charging Integrated Solution Magnetizing Equipment Magnetizing Automation Magnetic Measuring Instruments Magnetizing Service Magnetizing is the core step in the manufacture and maintenance of permanent magnet motors such as permanent magnet synchronous motors (PMS) and brushless DC motors (BDC). It relies on the principle of electromagnetic induction and magnetic field energy conversion, with the help of external strong magnetic field to make the internal magnetic domains of permanent magnets arranged in a directional manner, so as to form stable and long-lasting magnetism, which is the basic link to ensure the normal operation of the motor. First, the essence of magnetization: to give the motor...

Spring Ushers in a New Journey, Action Drives New Chapters｜JIUJU Automation Kicks Off 2026 with Success

February 25, 2026

Magnetizing Equipment | Magnetizing Automation | Magnetic Measuring Instruments | Magnetizing Services Spring Returns, Unveiling a New Chapter — Setting Sail on a New Journey On the eighth day of the first lunar month of 2026, an auspicious day to commence work in the new year, JIUJU Automation was filled with warmth and vitality. Having set aside the leisurely pace of the Spring Festival, all employees gathered at the facility with full enthusiasm and high spirits, collectively embarking on the journey of hard work for the new year. They are committed to upholding their original aspirations through practical action and striving to write a new chapter of glory with dedicated effort. At 8:00 AM sharp...