【摘要】：利用尿素對小麥秸稈生物質(zhì)炭進行改性,用于吸附水中氨氮。研究了尿素添加量、pH、改性生物質(zhì)炭投加量、共存陽離子等因素對改性生物質(zhì)炭吸附氨氮的影響,并研究了吸附的熱力學和動力學機制。結(jié)果表明,1.00g未改性生物質(zhì)炭中添加2.4g尿素時制備得到的改性生物質(zhì)炭UBC-4對氨氮吸附能力最好,零電荷點相比改性前明顯降低。處理20mL 60mg/L的氯化銨溶液,UBC-4最佳投加量為0.20g,最適pH為8。實際廢水處理中應考慮Na+、Mg2+等共存陽離子對UBC-4吸附氨氮的競爭吸附作用。Langmuir方程能較好地擬合UBC-4對氨氮的吸附等溫過程,準二級動力學模型能較好地描述其動力學過程。吸附為自發(fā)的吸熱過程,主要機制是物理吸附。
[Abstract]:Wheat straw biomass carbon was modified by urea to adsorb ammonia nitrogen in water. The effects of pH of urea, dosage of modified biomass carbon and co-existing cations on the adsorption of ammonia nitrogen by modified biomass carbon were studied. The thermodynamic and kinetic mechanisms of adsorption were also studied. The results showed that the modified biomass carbon (UBC-4) prepared by adding 2.4 g urea to unmodified biomass carbon had the best adsorption capacity for ammonia nitrogen, and the zero charge point was obviously lower than that before modification. The optimum dosage of UBC-4 in ammonium chloride solution treated with 20mL 60mg/L is 0.20 g and the optimum pH is 8. In practical wastewater treatment, the competitive adsorption of UBC-4 to ammonia nitrogen by co-existing cations such as Na and mg _ 2 should be considered. Langmuir equation can fit the isothermal process of UBC-4 adsorption of ammonia nitrogen well, and the quasi-second-order kinetic model can describe the kinetic process well. Adsorption is a spontaneous endothermic process, and the main mechanism is physical adsorption.
【作者單位】： 西北大學城市與環(huán)境學院;
【基金】：國家自然科學基金資助項目(No.51208424) 城市水資源與水環(huán)境國家重點實驗室開放基金面上基金資助項目(No.QA201318) 陜西省重點科技創(chuàng)新團隊計劃項目(No.2014KCT-27) 陜西省環(huán)境保護專項基金資助項目
【分類號】：X703
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本文編號：2219728