1.前言染料废水是水体污染的主要来源之一，据估计，大约有4万种合成染料

1. Introduction <br>Dye wastewater is one of the main sources of water pollution. It is estimated that about 40,000 synthetic dyes are being used on a large scale, of which water-soluble anionic dyes are the most common. Wastewater containing such dyes and their derivatives has the characteristics of poor biodegradability, high chroma, large pH changes, high COD, and pathogenicity. It is extremely difficult to remove and poses a great threat to human health and environmental safety. The common methods of treating dye wastewater mainly include flocculation, adsorption, biological treatment, oxidation and membrane separation. Among them, the adsorption method is widely used in the repair of dyes due to its advantages such as high efficiency, low energy consumption, strong regeneration capacity, and rich sources of adsorbents. For difficult-to-treat anionic dyes, traditional flocculants and adsorbents are difficult to obtain Satisfactory decolorization effect. Therefore, it is urgent to prepare adsorbents that are easy to recycle, high in decolorization, low in price and good in repeatability.

1. Preface<br>Dye wastewater is one of the main sources of water pollution. It is estimated that about 40000 kinds of synthetic dyes are being widely used, of which water-soluble anionic dyes are the most common. The wastewater containing these dyes and their derivatives has the characteristics of poor biodegradability, high chroma, large pH change, high COD and pathogenicity. It is very difficult to remove and poses a great threat to human health and environmental safety. The common methods of treating dye wastewater mainly include flocculation, adsorption, biological treatment, oxidation and membrane separation. Among them, adsorption method is widely used in the repair of dyes because of its advantages of high efficiency, low energy consumption, strong regeneration ability and rich source of adsorbents. For difficult anionic dyes, traditional flocculants and adsorbents are difficult to achieve satisfactory decolorization effect. Therefore, it is urgent to prepare adsorbents with easy recovery, high decolorization rate, low price and good repeatability and practicability.

1. Introduction Wastewater is one of the main sources of water pollution. It is estimated that about 40,000 kinds of synthetic dyes are being widely used, among which water-soluble anionic dyes are the most common. The wastewater containing these dyes and their derivatives has the characteristics of poor biodegradability, high chroma, large pH change, high COD and pathogenicity, which is extremely difficult to remove and poses a great threat to human health and environmental safety. Common methods for treating dye wastewater mainly include flocculation, adsorption, biological treatment, oxidation and membrane separation. Among them, adsorption method is widely used in dye remediation because of its advantages of high efficiency, low energy consumption, strong regeneration ability and abundant adsorbent sources. However, traditional flocculants and adsorbents are difficult to achieve satisfactory decolorization effect for difficult-to-treat anionic dyes. Therefore, it is urgent to prepare adsorbents with easy recovery, high decolorization rate, low price and good repeatability.