Secondly, Desulfurization efficiency was influenced by different metal ions. The better desulfurization performance, the smaller radius of positive metal ion;
其次，考察了金属离子对吸附剂性能的影响，发现金属离子半径越小，吸附脱硫性能越好；
Thus could be resulted from the complexation by which increases the electron density of the metal ion through partial sharing of its positive charge with donor groups.
主要原因可能是形成配合物后电子由配体流向配位的中心阳离子，增加了电子的转移能力。
The positive charge of metal ion determines the strength of the acid.
而金属离子的电荷决定了酸的强弱。
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