Preparation method of expanded perlite sulfur-loading modified patina adsorbent

Abstract

The invention discloses a preparation method of an expanded perlite sulfur-loading modified patina adsorbent. The preparation method comprises the following preparation steps: mixing sodium dimercaptopropanesulfonate and iron sulfate evenly so as to obtain a sulfur-iron mixture, then mixing the obtained sulfur-iron mixture with expanded perlite evenly, performing mechanical grinding so as to obtain an activated expanded perlite sulfur-iron-doped agent, then adding the activated expanded perlite sulfur-iron-doped agent to a sodium hydroxide solution, performing sealing and stirring so as to obtain expanded perlite sulfur-loading modified patina absorbent slurry, performing solid-liquid separation on the slurry, and finally performing drying, grinding and sieving so as to obtain the expandedperlite sulfur-loading modified patina adsorbent. Simultaneous and efficient removal of multiple heavy metal ions in sewage can be achieved through the patina adsorbent within a wide pH range of 2-12, and the removal rate of all the heavy metal ions is greater than 97%.

Description

technical field [0001] The invention relates to a preparation method of a green rust adsorbent for treating heavy metal wastewater, in particular to a preparation method of an expanded perlite sulfur-loaded modified green rust adsorbent. Background technique [0002] The abundance of iron in the earth is second only to aluminum, ranking fourth among all elements. Iron is usually in the form of ferrite. At present, there are 16 kinds of ferrites with different crystal structures on the earth, which can be divided into three categories according to the chemical composition and the chemical valence state of iron: the first category is ferrites containing only ferric iron, such as ferrihydrite, goethite ore, hematite, lepidotite, etc.; the second type is ferrite containing only divalent iron, such as ferrous oxide and ferrous hydroxide; the third type is iron containing both divalent iron and ferric iron Oxygen, such as magnetite and patina. [0003] Patina is usually dark bl...

AI Technical Summary

Problems solved by technology

The pH sensitivity of green rust will reduce the adsorption performance of green rust itself to heavy metals, which is not conducive to its popularization and application in different pH polluted water environments

At present, green rust still has the problem that the adsorption capacity is small, and it cannot efficiently remove multiple heavy metals in water at the same time.

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