A phosphorylated sorbent exhibiting an enhanced selectivity of Cu²⁺ sorption from aqueous media in the presence of surplus Ca²⁺ was obtained by carbonization of pine sawdust impregnated with (NH₄)₃PO₄ or a mixture of (NH₄)₃PO₄ and CO(NH₂)₂. With an increase of Ca²⁺ concentration to 1 g/dm³, the coefficient of separation using the sorbent phosphorylated in the presence of carbamide increased and reached the level of 19.6 that was three times as much as in the case of sorbent obtained without carbamide. The specific sorption capacity with respect to Cu²⁺ was higher by ~2 mg/g irrespective of the background concentration of Ca²⁺ ions; however, this capacity decreased as the content of the latter increased. The field tests of using the obtained sorbent for extraction of Ni²⁺ and Zn²⁺ at the stage of tertiary treatment of wastewater from the electroplating production facility before the wastewater discharge were carried out.

中文翻译：

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基于天然原料的磷酸化碳吸附剂从水中提取重金属离子

磷酸化的吸附剂表现出Cu的增强的选择性²⁺过剩的钙的存在下的水性介质吸着²⁺通过松木屑浸渍的碳化（NH得到₄）₃ PO ₄或的混合物（NH ₄）₃ PO ₄和CO（NH ₂）₂。随着Ca ²⁺浓度增加到1 g / dm ³，使用在氨基甲酰胺存在下被磷酸化的吸附剂的分离系数增加，达到19.6的水平，是未使用氨基甲酰胺获得的吸附剂的三倍。不论Ca ²⁺离子的本底浓度如何，对Cu ²⁺的比吸附容量均高〜2 mg / g 。然而，随着后者含量的增加，这种能力降低了。进行了使用所得吸附剂在电镀废水排放前对电镀生产设备进行废水的三级处理阶段提取Ni ²⁺和Zn ^2+的吸附剂的现场测试。