本文關(guān)鍵詞： 吸附 銨氮 鹽化潮土 動力學 熱力學　出處：《環(huán)境科學與技術(shù)》2017年09期 　論文類型：期刊論文

【摘要】：蘇北濱海地區(qū)鹽堿性土壤通過耕作措施進行了長期改良,探討銨氮在該類型土壤中的吸附特性對防控鹽堿土區(qū)域氮素流失風險具有重要意義。選取蘇北平原濱海地區(qū)典型鹽化潮土,開展了銨氮吸附特性室內(nèi)模擬研究,描述吸附等溫過程,探討初始濃度和p H的影響,揭示銨氮吸附的動力學和熱力學特征。結(jié)果表明:銨氮平衡吸附變化滿足Langmuir吸附等溫式,以單分子層電性吸附模式為主;吸附過程符合Elovich方程;溶液初始濃度越大、p H越高、溫度越低,銨氮吸附量越大,但吸附速率降低;熱力學參數(shù)估算顯示該吸附是放熱過程,初始濃度增加,吸附需克服的能壘越高。
[Abstract]:The salt-alkaline soil in the coastal area of northern Jiangsu has been improved through tillage measures for a long time. It is important to study the adsorption characteristics of ammonium nitrogen in this type of soil for preventing and controlling the risk of nitrogen loss in saline and alkali soils. The laboratory simulation study on the adsorption characteristics of ammonium nitrogen in typical salinized tidal soils in the coastal area of northern Jiangsu Plain was carried out. The adsorption isothermal process was described, the effects of initial concentration and pH were discussed, and the kinetics and thermodynamics of ammonium nitrogen adsorption were revealed. The results showed that the equilibrium adsorption of ammonium and nitrogen was in accordance with the Langmuir adsorption isotherm, and the single layer electroadsorption model was the main one. The adsorption process accords with the Elovich equation, the higher the initial concentration of solution is, the higher the temperature is, the higher the adsorption rate of ammonium nitrogen is, but the lower the adsorption rate is, and the thermodynamic parameter estimation shows that the adsorption process is exothermic, and the initial concentration increases. The higher the energy barrier to be overcome by adsorption.
【作者單位】： 首都師范大學資源環(huán)境與旅游學院資源環(huán)境與地理信息系統(tǒng)北京市重點實驗室;北京師范大學環(huán)境學院;環(huán)保部環(huán)境規(guī)劃院;
【基金】：國家自然科學基金(41301529,41471396,41601581) "十二五"國家科技支撐計劃(2015BAC02B02)
【分類號】：S156.42

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本文編號：1548389