Heavy metal modified bioadsorbent and preparation method thereof as well as application of heavy metal modified bioadsorbent in tungsten-containing waste water treatment

Abstract

The invention discloses a heavy metal modified bioadsorbent and a preparation method thereof as well as an application of the heavy metal modified bioadsorbent in tungsten-containing waste water treatment. The heavy metal modified bioadsorbent is formed by alga or fruit residue sequentially subjected to saponification, saponification crosslinking, graft copolymerization, sulfenyl complexation and xanthation modification treatment. The preparation method of the heavy metal modified bioadsorbent takes certain amount of fruit residue waste or algae as a raw material and comprises the following steps of: cleaning, drying, levigating and sieving, sequentially carrying out saponification, saponification crosslinking, graft copolymerization, sulfenyl complexation and xanthation modification treatment, and then adding active groups adsorbing metal ions into orange peel, so that the aim of improving adsorption capacity of the heavy metal modified bioadsorbent is achieved. The invention also correspondingly provides a method for treating the tungsten-containing waste water by utilizing the heavy metal modified bioadsorbent. The heavy metal modified bioadsorbent has good adsorption effect and is simple to operate, easy to implement, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to the field of microorganism application and waste water treatment, in particular to a heavy metal modified biosorbent, a preparation method thereof and an application in treating tungsten-containing waste water. Background technique [0002] Tungsten is a rare metal with high melting point and high hardness. It is widely used in various fields such as metallurgy, machinery, petroleum, mining, electronics and aerospace. Especially after the 18th National Congress of the Communist Party of China, various tungsten smelting enterprises are faced with the transformation and upgrading of enterprises, and the elimination of enterprises and plants that do not meet environmental protection standards. However, they have their special advantages in developing non-polluting metallurgical processes. When decomposing tungsten ore with alkali, the heavy metal ions in the minerals will also enter the crude sodium tungstate solution, and the exc...

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Problems solved by technology

However, the direct use of fruit residues as adsorbents has disadvantages such as small adsorption capacity, unstable performance, and difficulty in achieving adsorption equilibrium, mainly due to the fact that there are more water-soluble components, non-pectin, and tannin components and less exposed active groups. In addition, as a natural adsorbent, pectin-containing substances can absorb heavy metal ions in the solution to a certain extent, but the strong hydration of pectin hinders its direct application, so it must be chemically modified deal with