Composite photocatalytic material taking excess sludge as carrier as well as preparation method and application of composite photocatalytic material

By in-situ growing cadmium sulfide nanoparticles on residual sludge-derived carbon and encapsulating them with a C3N5 shell to form an internal S-scheme heterojunction, the conductivity and stability issues when combining residual sludge carbon with photocatalytic materials are solved, achieving highly efficient photocatalytic performance and a long-life photocatalytic material.

CN121847196APending Publication Date: 2026-04-14CHONGQING UNIV OF ARTS & SCI
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-09
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively combine residual sludge-derived carbon with photocatalytic materials. This results in low conductivity, uneven distribution of surface functional groups, and poor pore structure, making it difficult to uniformly load the active components, which are prone to detachment. Consequently, these technologies fail to effectively protect the photocatalytic active components, affecting the material's light absorption, charge separation, and resistance to photocorrosion.

Method used

In-situ self-doped residual sludge-derived porous carbon framework is combined with core-shell structural units. Cadmium sulfide nanoparticles are grown in-situ on the carrier surface using a hydrothermal method and encapsulated with a C3N5 shell to form an internal S-scheme heterojunction, thereby achieving firm anchoring and stable protection of active components.

Benefits of technology

It improves the photogenerated charge separation efficiency of photocatalytic materials, inhibits photocorrosion, extends catalyst lifetime, and optimizes light absorption and charge transport through synergistic effects, thereby enhancing hydrogen evolution activity and cycle stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121847196A_ABST
    Figure CN121847196A_ABST
Patent Text Reader

Abstract

The invention discloses a composite photocatalytic material with excess sludge as a carrier and a preparation method and application thereof.Porous conductive carbon obtained after carbonization and acid pickling of the excess sludge serves as a framework of the material, a core-shell structure unit composed of a CdS nanometer core and a C3N5 shell layer grows on the surface of the framework in situ, and an S-schema heterojunction is formed. The preparation method mainly comprises three steps of carbonization and purification of sludge, hydrothermal in-situ growth of CdS and vapor deposition wrapping of a C3N5 shell layer. The material fully utilizes the charge separation advantage of a conductive network and heterojunction of sludge carbon, shows excellent hydrogen evolution activity and stability under visible light, realizes high-value utilization of excess sludge, and provides a new material for efficient and low-cost photocatalytic hydrogen production.
Need to check novelty before this filing date? Find Prior Art