Addressing the issue of surface mechanisms and competitive effects in Cr(VI) reductive-adsorption on tin-hydroxyapatite in the presence of co-ions

被引：2

作者：

Avola, Tiziana ^{[1
]}

Campisi, Sebastiano ^{[1
]}

Polito, Laura ^{[2
]}

Arici, Silvia ^{[3
]}

Ferruti, Ludovica ^{[4
]}

Gervasini, Antonella ^{[1
]}

机构：

[1] Univ Milan, Dipartimento Chim, Via Camillo Golgi 19, I-20133 Milan, Italy

[2] SCITEC CNR, Ist Sci & Tecnol Chim Giulio Natta, Via G Fantoli 16-15, I-20138 Milan, Italy

[3] A2A Ciclo Idrico SPA, Lab Chim, Via Lamarmora 230, I-25124 Brescia, Italy

[4] A2A SPA, Grp Risk Management, Enterprise Risk Management, Cso Porta Vittoria 4, I-20122 Milan, Italy

来源：

SCIENTIFIC REPORTS | 2023年 / 13卷 / 01期

关键词：

HEXAVALENT CHROMIUM; AQUEOUS-SOLUTION; REMOVAL; CATALYSTS; LEAD(II); VALENT; WATER;

D O I：

10.1038/s41598-023-44852-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Our group recently proposed an innovative sustainable reductant-adsorbent material, tin(II)-hydroxyapatite (Sn/HAP, ca. 10 wt% Sn) for the interfacial Cr(VI) reductive adsorption process. In this study, Cr(VI) removal capacity was evaluated in multi-component solutions containing representative background ions (i.e., CaCl2, Ca(NO3)2, MgSO4, Na2SO4, Fe(NO3)3, AlCl3, Zn(NO3)2, or Mn(NO3)2). Sn/HAP was able to reduce Cr(VI) with complete Cr3+ adsorption on HAP surface, except in the presence of Fe3+ and Al3+ ions. Some metal ions co-existing in solution, such as Fe3+, Al3+, Zn2+, and Mn2+, were also adsorbed on HAP surface. Reuse experiments of the Sn/HAP sample, up to 7 runs, resulted in a total amount of reduced Cr(VI) of ca. 15-18 mg g-1. Fast kinetics of Cr(VI) reductive adsorption at 25 degrees C in a multi-metal component solution was observed. The pseudo-second order model was in excellent agreement with the experimental kinetic data, leading to a rate constant (k25 degrees C) value of ca. 30 M-1 s-1. The collection of adsorption isotherms of Cr3+ and Fe3+, together with TEM-EDX analysis permitted the unveiling of competitive adsorption phenomena between metal ions. The obtained results demonstrate that Sn/HAP could be an efficient material for the removal of hexavalent chromium in aqueous solutions containing high concentrations of inorganic impurities.

引用

页数：14