Cadmium Pollution And Investigation On The Adsorption Properties Of Cadmium Ion On 13X Molecular Sieve

The cadmium pollution oringin from minning, electroplating, smelting of non-ferrous metal,texting printing and dyeing, the factory of using raw materials or catalyst, the discharge of military production, phosphate fertilizer of preparating phosphate rock, glass, ceramics, paint, pharmacy, fiber.Cadmium is not essential element of the body, the ideal content in the body is zero.It is the IA-leval carcinogen.The content of cadmium in groundwater in china some areas exceeds standard content. People drink chronically the water containing cadmium. Cadmium in the body is accumulated. The latency of disease extend as long as decades.Savings to a certain extent, disease occurs,such as pain patients,liver disease, kidney disease.In this paper, by the means of atomic fluorescence spectrometry, adsorption capability of 13X molecular sieve adsorbent for heavy metal cadmium ion was systematically researched. The factors affecting cadmium adsorption conditionsand adsorption property was investigated.The main contents are concluded as follows:(1).The heavy metal cadmium of water and sediment samples in fenhe of Taiyuan from upstream to downstream was determinated.The potential ecological risk assessment of cadmium in the sediment was studied.(2) In this thesis, by comparison of the adsorption capacity of several different adsorbents, it has been found that the 13X mocular zeolite has the higher adsorption capacity than other absorbents.So the 13X mocular zeolite was used as the adsorbent for the further study.The impact factors of cadmium ion adsorption was furtherly investigated.The adsorption equilibrium time, pH, temperature, amount of molecular sieve, interfering ions and other factors on 13X molecular sieve adsorption of cadmium ions were studied.(3)The laboratory simulated wastewater was treated by 13X molecular sieve. The results show that the effection of 13X molecular sieve dealing with low concentrations of cadmium is very good.Existing conditions of Zn2+, Pb2+, Cu2+, the adsorption of cadmium is not basically effected.The regeneration performance is investigated by eluting 13X molecular. The adsorption mechanism of 13X molecular sieve was preliminary investigated.