使用商用树脂去除磷酸中的镉和铁以进行纯化。,Environmental Science and Pollution Research

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使用商用树脂去除磷酸中的镉和铁以进行纯化。
Environmental Science and Pollution Research Pub Date : 2020-06-01 , DOI: 10.1007/s11356-020-09342-7
Mohamed H Taha ₁ , Ahmed M Masoud ₁ , Yasser M Khawassek ₁ , Ahmed E M Hussein ₁ , Hisham F Aly ₂ , Eric Guibal ₃

Affiliation

已经测试了三种带有磺酸、氨基膦酸或膦酸/磺酸反应基团的商用树脂从磷酸溶液中去除铁和镉。比较了不同实验条件下的吸附特性，例如吸附剂用量（0.5-2.5 g L-1）、磷酸浓度（来自双组分溶液，0.25-2 M）和金属浓度（即在 0.27-2.5 范围内）。 2.7 mmol Cd L-1 和 0.54 mmol Fe L-1)，特别注意树脂上反应基团类型的影响。磺酸基树脂 (MTC1600H) 对 Cd（对 Fe）更具选择性，特别是在高磷酸浓度和低吸附剂用量下，而 MTS9500（氨基膦酸树脂）对 Fe 去除更具选择性（无论酸浓度和吸附剂用量如何）。2-4 小时内达到平衡。根据系列，树脂可按累积吸附容量排序：MTC1600H > MTS9570 > MTS 9500。对于 MTC1600H，硫酸（0.5-1 M）可有效用于铁和镉的解吸，而对于 MTS9570（膦酸） /磺酸树脂）硫酸正确地解吸 Cd（1 M 浓度下高于 96%），与 Fe（小于 30%）相反。氨基膦酸树脂在解吸方面表现出较差的效率。磺酸树脂（即 MTC1600H）表现出更高的吸附能力、更好的选择性、相当的吸收动力学（约 2 小时平衡时间）和更好的金属解吸附能力（无论酸的类型如何，1 M 酸浓度下的解吸附率均高于 98%））。通过比较不同类型工业磷酸溶液（粗磷酸溶液和预处理磷酸溶液）处理的去除性能，证实了这一结论。三种树脂对于粗磷酸的处理和活性炭预处理（MTC1600H降低镉含量77%）效率较低。然而，MTC1600H 可以去除经过 TBP 溶剂萃取预处理的 H3PO4 中超过 93% 的 Fe 和 Cd，而其他产品的效率则低得多（< 53%）。

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Cadmium and iron removal from phosphoric acid using commercial resins for purification purpose.

Three commercial resins bearing sulfonic, amino phosphonic, or phosphonic/sulfonic reactive groups have been tested for the removal of iron and cadmium from phosphoric acid solutions. The sorption properties are compared for different experimental conditions such as sorbent dosage (0.5-2.5 g L-1), phosphoric acid concentration (from bi-component solutions, 0.25-2 M), and metal concentrations (i.e., in the range 0.27-2.7 mmol Cd L-1 and 0.54 mmol Fe L-1) with a special attention paid to the impact of the type of reactive groups held on the resins. The sulfonic-based resin (MTC1600H) is more selective for Cd (against Fe), especially at high phosphoric acid concentration and low sorbent dosage, while MTS9500 (aminophosphonic resin) is more selective for Fe removal (regardless of acid concentration and sorbent dosage). Equilibrium is reached within 2-4 h. The resins can be ranked in terms of cumulative sorption capacities according the series: MTC1600H > MTS9570 > MTS 9500. Sulfuric acid (0.5-1 M) can be efficiently used for the desorption of both iron and cadmium for MTC1600H, while for MTS9570 (phosphonic/sulfonic resin) sulfuric acid correctly desorbs Cd (above 96% at 1 M concentration), contrary to Fe (less than 30%). The aminophosphonic resin shows much poorer efficiency in terms of desorption. The sulfonic resin (i.e., MTC1600H) shows much higher sorption capacity, better selectivity, comparable uptake kinetics (about 2 h equilibrium time), and better metal desorption ability (higher than 98% with 1 M acid concentration, regardless of the type of acid). This conclusion is confirmed by the comparison of removal properties in the treatment of different types of industrial phosphoric acid solutions (crude, and pre-treated H3PO4 solutions). The three resins are inefficient for the treatment of crude phosphoric acid, and activated charcoal pre-treatment (MTC1600H reduced cadmium content by 77%). However, MTC1600H allows removing over 93% of Fe and Cd for H3PO4 pre-treated by TBP solvent extraction, while the others show much lower efficiencies (< 53%).

更新日期：2020-06-01

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