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稻殼炭對(duì)銨態(tài)氮的吸附機(jī)理研究
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科技部農(nóng)業(yè)科技成果轉(zhuǎn)化資金項(xiàng)目(2014GB2E000048)


Adsorption Mechanism of Ammonium Nitrogen onto Rice Husk Biochar
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    摘要:

    研究了500℃連續(xù)熱解制備的稻殼炭對(duì)水溶液中NH + 4-N的吸附特性和稻殼炭用量、顆粒粒徑、NH + 4-N初始質(zhì)量濃度、pH值、振蕩時(shí)間等因素對(duì)NH + 4-N吸附特性的影響。結(jié)果表明,隨著NH + 4-N溶液初始質(zhì)量濃度、pH值的不斷升高,稻殼炭對(duì)NH + 4-N的平衡吸附量不斷增加,而隨著振蕩時(shí)間的推移,平衡時(shí)稻殼炭對(duì)NH + 4-N的單位吸附量不斷增加,60 min內(nèi)吸附較快,在吸附90 min左右時(shí)保持不變,這說(shuō)明稻殼炭對(duì)NH + 4-N的吸附在1.5 h左右基本達(dá)到平衡,對(duì)于初始質(zhì)量濃度為3 mg/L和5 mg/L的NH + 4-N溶液,稻殼炭對(duì)NH + 4-N的最大吸附量分別為31.26、81.14 mg/kg。稻殼炭的顆粒粒徑越小,單位吸附量越高,0.25 mm以下的稻殼炭對(duì)NH + 4-N的吸附容量較大。從熱力學(xué)和動(dòng)力學(xué)角度探究了吸附機(jī)理,結(jié)果表明,稻殼炭對(duì)NH + 4-N的等溫吸附過(guò)程符合Freundlich模型,表明稻殼炭對(duì)水溶液中的NH + 4-N吸附為不均一的多分子層吸附;準(zhǔn)二級(jí)吸附模型能較好地描述吸附的全過(guò)程,稻殼炭吸附NH + 4-N主要包含液膜擴(kuò)散、表面吸附、顆粒內(nèi)部擴(kuò)散過(guò)程,主要以物理吸附為主。

    Abstract:

    The adsorption mechanism of rice husk biochar to ammonium nitrogen was investigated. The influence of biochar amount, particle size, original concentration and pH value of ammonium nitrogen solution and shaking time on the adsorption characteristics were explored. The results showed that the unit adsorption quantities of ammonium nitrogen were increased with the increase of original concentration and pH value of ammonium nitrogen solution. The adsorption rate reached the highest point within 60 min and then kept unchanged within 90 min. The adsorption equilibrium of ammonium nitrogen was gained within 1.5 h. The maximum adsorption for ammonium nitrogen solutions was 81.14 mg/kg. Additionally, the effect of particle size on the adsorption process was significant. High adsorption quantities of ammonium nitrogen were got with small particle size and the adsorption capacity of rice husk biochar reached the maximum with particle size of 0.25 mm. The adsorption mechanism was investigated using thermodynamic and kinetics analyses. The results indicated that the adsorption behavior of biochar for ammonium nitrogen was inhomogeneous and it belonged to one of polymolecular layer fitted by Freundlich model properly. Quasi-dynamic equations were matched well with adsorption process of biochar to ammonium nitrogen, which included the diffusion in the fluid film, shift inside the grains and surface adsorption process by physical adsorption.

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杜衍紅,蔣恩臣,李治宇,張世軍,李世博,王明峰.稻殼炭對(duì)銨態(tài)氮的吸附機(jī)理研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2016,47(2):193-199,214. Du Yanhong, Jiang Enchen, Li Zhiyu, Zhang Shijun, Li Shibo, Wang Mingfeng. Adsorption Mechanism of Ammonium Nitrogen onto Rice Husk Biochar[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(2):193-199,214.

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  • 收稿日期:2015-11-17
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  • 在線發(fā)布日期: 2016-02-25
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