Ferrum carried spherical cellulose adsorbent, preparation and application thereof

Abstract

The invention relates to a kind of globe-form cellulose absorbent with iron carrying and its manufacturing and application. The carrying agent of the invention is globe-form cellulose, and the active center is the hydroxide of iron in the specific form, which has the high absorption activity. The manufacturing feature is as follows: dropwise alkali solution tardily into the solution of cellulose bead and molysite; in stirring condition, iron can load the cellulose bead by dispersing and hydrolyzing; after loading repeatedly and frequently, use the alkali solution to stabilize the ferruginous form. The manufacturing method of the absorbent has the advantages of environmental protection, novelty, simplicity and low cost. Moreover, it can remove arsenic, fluorine and other heavy metal with high efficiency and high selectivity, and the absorbent has excellent usage-prospect in nowadays.

Description

technical field [0001] The invention relates to an iron-loaded spherical cellulose adsorbent and its preparation and application. Background technique [0002] Arsenic is one of the most toxic elements and ranks at the top of the black list of polluting toxic elements (WHO, 1999). Arsenic contamination of drinking water sources, especially drinking groundwater, has attracted worldwide attention in recent years (AWWA, 2001; Bagla, 1996). The health of 7 million people throughout Bangladesh is at risk from drinking groundwater high in arsenic (Nickson, 1998; Bearak, 1998). The problem of arsenic pollution in China is also very prominent. The content of arsenic in groundwater in some areas of Taiwan, Xinjiang and Inner Mongolia seriously exceeds the standard, and the content in some areas of Inner Mongolia is as high as 2000ppb (Smedley, 2002; Sun Tianzhi, 1994). The European Union and the United States have re-established the sanitary standards for arsenic in drinking water,...

AI Technical Summary

Problems solved by technology

Using natural minerals to remove arsenic is cheap and has a wide range of sources, but the adsorption capacity is generally low, the removal efficiency is not high, and because it contains other trace elements, there may be other health risks (Zouboulis, 1993; Chakravarty, 2002)

Various metal oxides such as oxides of lanthanum, cerium, and zirconium, and iron oxides such as goethite, magnetite, and amorphous ferric hydroxide have been reported to remove arsenic (Tokunaga, 1997; Suzuki, 2000; Appelo, 2002; Jain, 1999), but most of these oxides are affected as adsorbents in packed beds due to their structure and pore distribution.

Both arsenate and arsenite ions exist in a certain proportion in groundwater. Most of the above-mentioned adsorbents cannot effectively remove arsenite ions. Therefore, when using them to remove arsenic, a pre-oxidation process such as chlorine, potassium permanganate, Ozone oxidation, etc., increased operating procedures and costs

A German patent is to granulate β-type iron oxyhydroxide to obtain a granular arsenic-removing adsorbent, but it is not wear-resistant, and it is easy to agglomerate during column operation (Driehaus, 1994)

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