Preparation and use method of dephosphorization carboxyl functionalized nano Fe2O3 adsorbing agent for wastewater

Abstract

The invention provides a preparation of a wastewater phosphorus removal carboxyl functional nanometer Fe3O4 adsorbent and an application method thereof. The preparation method comprises the following steps: taking FeCl2.4H2O and FeCl3.6H2O as the source of iron grains; dropping sodium hydroxide as a precipitant under the protection of inert gas; preparing a certain dimension of Fe3O4 grains; adding diethylene triaminepentaacetic acid (DTPA) carbonation by utilizing the in-situ composite method during the precipitating and the forming processes of the nanometer Fe3O4 crystal grains; and preparing the black carboxyl functional nanometer Fe3O4 adsorbent, wherein the diameter of the adsorbent is 5 to 20 nm. The preparation and the application of the adsorbent have simple operation steps, low cost and highly-efficient removal effect for phosphate in water; the removal ratio achieves above 99 percent; the adsorbent can be widely applied to the high-concentration phosphoric industrial wastewater and water supply depth phosphorus removal process and can be separated from the solution after being absorbed quickly under an external magnetic field, thereby solving the problem of solid-liquid separation after phosphor is absorbed by the adsorbent; and the adsorbent can be recovered and utilized and has simple and generative method.

Description

(1) Technical field [0001] The invention relates to an adsorbent for water treatment, and also relates to an application of the adsorbent for water treatment. (2) Background technology [0002] Phosphorus is one of the essential elements for biological growth, and is widely used in industry, agriculture, medicine, biology and other industries. However, when wastewater containing a relatively high concentration of phosphorus (such as more than 0.2mg / L) enters the environmental water body, it will pose a hazard to aquatic animals such as fish, and stimulate the excessive growth of aquatic plants such as algae, resulting in eutrophication such as red lakes and red tides. pollution phenomenon. Even a small amount of phosphorus in treated wastewater can cause eutrophication of lakes. Studies have shown that phosphorus is one of the elements that have obvious limitations on microbial regrowth in pipe networks. For most water quality, when the total phosphorus concentration is lo...

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Problems solved by technology

However, due to the quasi-equilibrium phenomenon of tiny particles, the apparent solubility product is much higher than the true solubility product. In order to achieve the formation conditions of phosphate precipitation, the concentration of the metal ion precipitant that needs to be added is 1-2 orders of magnitude higher than the normal solubility product. , so the drug cost is higher

In addition, there are also disadvantages such as large amount of sludge generated, high moisture content of sludge, difficult dehydration, difficult to handle, and easy to produce secondary pollution.

At the same time, the alkalinity in the raw wastewater causes some metal hydroxides to precipitate, which also reduces the purity of the product. Therefore, the chemical precipitation method is generally limited to the recovery of phosphorus from high-concentration phosphorus-containing solutions.

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