不同温度下制备的椰壳生物炭对水中Cu(II)的吸附研究

Study on the Adsorption of Cu(II) in Water by Coconut Shell Biochar Prepared at Different Temperatures

摘要: 化工业的快速兴起，使含有农药、油漆以及化肥等有害废水和废渣大量排放，导致环境中的铜污染进一步恶化。因此，要降低和消除环境中过量的金属铜，吸附是一种行之有效的技术手段。生物炭因其制备费用低，吸附性能好以及对环境友好等特点而被广泛研究使用。本实验以我国海南省来源广泛的椰壳作为原材料，分别在500℃、600℃和700℃条件下制备生物炭(分别记为T500、T600和T700)。利用三种温度制备的椰壳生物炭研究不同初始浓度、生物炭投加量、溶液初始pH值以及吸附时间等因素对水中Cu(II)的吸附特征。研究结论如下：1) 三种温度下制备的椰壳生物炭对水中Cu(II)都具有较好的吸附效果，在相同条件下，三种生物炭的吸附能力：T700 > T600 > T500。2) 在水中Cu(II)初始浓度为60 mg/L，投加量为0.2 g，pH为4，吸附时间为3 h时，T700的最大吸附量达到8.6833 mg/g。

Abstract: With the rapid development of chemical industry, large amounts of harmful waste water and waste residue including pesticides, paint and chemical fertilizers are discharged, which leads to further deterioration of copper pollution in the environment. Therefore, adsorption is an effective technique to reduce and eliminate excess metal copper in the environment. Among them, because of its low preparation cost, good adsorption performance and environmental friendly and so on, biochar is widely studied and used. In this experiment, a wide range of coconut shells from Hainan Province was selected as raw material to prepare the biochar respectively at the temperature of 500˚C, 600˚C and 700˚C (recorded as T500, T600 and T700). The effect of the initial concentration of the solution, the dosing of biochar, pH value and adsorption time factors on adsorption of Cu(II) in water by biochar was studied. Research conclusion shows that: 1) The coconut shell biochars prepared at the three temperatures all have good adsorption effect on Cu(II) in water. Under the same conditions, the adsorption capacity of the three biochars is: T700 > T600 > T500. 2) When the initial concentration of solution is 60 mg/L, the dosage is 0.2 g, pH is 4 and the adsorption time is 3 h, the maximum adsorption capacity of T700 is 8.6833 mg/g.