Acidification Modification Of Zeolite And Its Improvement Effect On Soda Alkaline Earth

The problem of salinization in global soil is becoming more and more serious.How to improve and utilize saline-alkali soil has become a difficult problem for scholars in global agricultural production and ecological environment protection.After pre-experimental screening and comprehensive consideration,zeolite was selected as soil modifier to improve soda alkali soil.This study selected sulfuric acid as acidifier to acidify zeolite and established better acidizing improvement conditions by using zeta potential.The particle size of zeolite was 140 mesh,and the effect of leaching 3 h by 3 mol.L^-1sulfuric acid was better.The results of structural characterization of natural zeolite and acid modified zeolite show that after acid modification,the inner pore of zeolite becomes thorough,impurities and water molecules are removed,and the Ca²⁺and K⁺content of zeolite are reduced.The structure of zeolite was more orderly than that of natural zeolite.After applying natural zeolite and acid modified zeolite to the experimental soil,Both soil p H,carbonate and bicarbonate levels decreased,The alkali-hydrolyzed nitrogen,water-soluble potassium and water-soluble phosphorus in phosphorus in the soil extract increased significantly;Among them S5 the best treatment group,After 15 d,p H down 0.34,Total CO3^2-and HCO^3-decreased by 3.45g/kg;per cent S3 treatment group has the best effect on the improvement of alkali-hydrolyzed nitrogen,42.58 mg/kg,higher The T3 treatment group has the best effect on the improvement P water soluble state,23.41 mg/kg,higher T5 treatment group to improve K water soluble state Best,up 17.54 mg/kg.After applying natural zeolite and acid modified zeolite,The content of Ca2 and Mg2 in soil increased significantly,The T3 treatment group had the best effect on increasing Ca2 content,56.27 mg/L,higher The S3 treatment group had the best effect on increasing Mg2 content,35.87mg/L;higher The soil Na content,SAR value and ESP,and total water soluble salt of soil decreased significantly,S3 treatment group had the best reduction,The Na content decreased224.24mg/L,SAR decreased by 57.76 per cent,ESP decreased by 48.11 per cent,S5 treatment group made total water soluble salt At the same amount 6.27g/kg,the effect of acid modified zeolite on the improvement of saline-alkali soil was better than that of natural zeolite.The establishment of zeolite acidification conditions provides a certain theoretical and applied basis for the modification process of zeolite acidification,and provides favorable support for the improvement of zeolite soda alkali soil.It provides applied basis for the effective utilization of zeolite on soda alkali soil.