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为改善中国北方土壤缺锰的问题,该文以麦草碱木质素为原料制备了羟甲基碱木质素(HMAL);以物理混合的方式添加硫酸锰,以甲醛、尿素作为交联剂使HMAL发生缩合交联制备了羟甲基交联碱木质素锰肥(CHMAL-Mn)。CHMAL-Mn肥产率为93.7%,CHMAL-Mn肥的锰离子的饱和负载量为48mg/g;其红外光谱表明甲醛成功交联羟甲基碱木质。以7种常见动力学和概率分布的数学模型对CHMAL-Mn肥的锰离子累积释放率的动力学试验数据的进行拟合,以R2、均方误差(e)、精确因子(Af)和偏差因子(Bf)的算数平均值比较模型拟合有效性。结果表明:对CHMAL-Mn肥的锰离子累积释放率的动力学试验数据拟合性最好的模型是Ritger-Peppa模型,其R2、e、Af和Bf的平均值分别为0.9443、0.0083、0.0223和0.0003。当CHMAL-Mn肥的锰负载量为12mg/g时,拟合模型的缓释指数n<0.45,锰离子缓释行为以Fick扩散为主。当CHMAL-Mn肥的锰负载量大于24mg/g时,拟合模型的缓释指数0.45≤n≤0.89,缓释机理为非Fick扩散与骨架溶蚀协同作用。当CHMAL-Mn肥的锰负载量达到饱和值48mg/g时,拟合模型的缓释指数n为0.811,该模型预测CHMAL-Mn肥对锰离子累积缓释率的极大值为79.28%,预测缓释时间为95.92h;模型拟合准确率为96.57%。该研究为可大幅提高碱木质对肥料锰肥的负载量,为碱木质素的综合利用和促进碱木质素在现代农业可降解缓/控释载体领域的应用提供了参考。
In order to improve the problem of manganese deficiency in soils of northern China, hydroxymethyl alkali lignin (HMAL) was prepared from wheat straw alkaline lignin. Manganese sulfate was added by physical mixing, and formaldehyde and urea were used as crosslinking agents to make HMAL A cross-linked condensation of hydroxymethyl methyl manganese lignin fertilizer (CHMAL-Mn) was prepared. CHMAL-Mn fertilization rate was 93.7%, CHMAL-Mn fertilizer manganese ion saturation load of 48mg / g; its infrared spectroscopy showed that formaldehyde cross-linked hydroxymethyl alkali wood. The kinetic test data of cumulative released rate of manganese ion of CHMAL-Mn fertilizer were fitted by mathematical model of seven kinds of common kinetics and probability distribution. R2, mean square error (e), exact factor (Af) and deviation The arithmetic mean of the factors (Bf) compares the model fit validity. The results showed that the best fitting model of CHMAL-Mn fertilizer kinetic test data fitting rate was Ritger-Peppa model. The average values of R2, e, Af and Bf were 0.9443, 0.0083 and 0.0223 And 0.0003. When the manganese loading of CHMAL-Mn fertilizers was 12 mg / g, the sustained release index of the fitted model was n <0.45, and the release behavior of manganese ions was dominated by Fick diffusion. When the manganese loading of CHMAL-Mn fertilizer is more than 24mg / g, the slow release index of the fitted model is 0.45≤n≤0.89, and the slow release mechanism is the synergistic effect of non-Fick diffusion and skeleton dissolution. When the Mn loading of CHMAL-Mn fertilizers reached the saturation value of 48mg / g, the slow release index (n) of the fitted model was 0.811. The model predicts the maximum value of CHMAL-Mn fertilizers for the cumulative release rate of manganese ions is 79.28% The predicted sustained release time was 95.92h; the accuracy of model fitting was 96.57%. This research can provide a reference for greatly increasing the load of alkali wood on fertilizers and manganese fertilizer and for the comprehensive utilization of alkali lignin and the application of alkali lignin in the field of modern agricultural biodegradable slow / controlled release carrier.