Active carbon preparation method using deinked sludge as raw material

Abstract

The invention discloses a method for preparing large-channel mesoporous active carbon by completely using deinked sludge as raw material. The method comprises the following steps: (1) uniformly mixing a certain amount of deinked slag and phosphoric acid, and airtightly standing and processing for a period of time after mixing; (2) warming and activating the mixture of the deinked slag and the phosphoric acid under the airtight condition, and slowly cooling the temperature to room temperature after the activation is finished; and (3) washing the activated product to pH approaching to neutral by use of hot water, and drying to obtain the product. A large number of large channels with micron-grade aperture and mesopores with the nano-grade aperture can be simultaneously formed by the product acquired by the method provided by the invention, the specific surface area can achieve 800 sq.m. / g, the methylene blue absorption value achieves 12ml, the iodine absorption value is 600mg / g, and the active carbon has excellent absorption capacity. The method disclosed by the invention has another beneficial effect that the active carbon can be prepared by completely using the deinked sludge as the raw material, and the product yield is high.

Description

technical field [0001] The invention relates to the field of activated carbon preparation, in particular to a method for preparing large-channel mesoporous activated carbon using deinking sludge as a raw material. Background technique [0002] In recent years, waste paper has been increasingly used in pulp and papermaking as a recycled fiber resource, and has gradually become an important source of raw materials for the pulp and paper industry. Waste paper must be deinked in the process of recycling, especially some high-grade and mid-grade waste paper pulps that have high quality requirements, will inevitably produce a large amount of deinking waste residue during the deinking process. As the recycling rate and utilization rate of waste paper increase year by year, a huge amount of deinking residue will be produced, which will undoubtedly cause serious pollution to the ecological environment. In 2008, the "National List of Hazardous Wastes" promulgated by the state formall...

AI Technical Summary

Problems solved by technology

Among them, the activation mechanism of KOH is complicated, the activation temperature is also high, and high-temperature poisonous gas will be generated during the activation process, which has a great impact on the environment; ZnCl 2 Serious pollution will also be produced during the activation process. More importantly, the above two methods are only suitable for biomass raw materials or coal raw materials with high lignin content, and are not suitable for cellulose as the main organic component and contain a large amount of inorganic Deinking sludge for paper filling

Images