Efficient elimination of As(V) and Sb(V) from wastewater streams has long been a major challenge. Herein, sulfide-modified α-FeOOH adsorbent was fabricated via a simple sulfidation reaction for removing As(V) and Sb(V) from aqueous media. Compared with the pristine α-FeOOH, sulfide-modified α-FeOOH increased the adsorption of As(V) from 153.8 to 384.6 mg/g, and Sb(V) adsorption from 277.8 to 1111.1 mg/g. The enhanced adsorption of both As(V) and Sb(V) was maintained at the pH range from 2 to 11, and was not interfered by various coexisting anions such as Cl^-, SO₄^2-, NO₃^-, SiO₃^2- and PO₄^3-. The adsorption affinity increased from 0.0047 to 0.0915 and 0.0053 to 0.4091 for As(V) and Sb(V), respectively. X-ray photoelectron spectroscopic investigation demonstrated a reductive conversion of As(V) to As(III) during the adsorption process with sulfide-modified α-FeOOH, but with no obvious variation of Sb(V) speciation. While the removal mechanism for As(V) was reduction followed by adsorption via hydroxyl groups, mainly surface complexation was involved in the removal of Sb(V). This study presented a simple strategy to enhance the adsorption capacity and adsorption affinity of α-FeOOH toward As(V)/Sb(V) via sulfide-modification.

长期有效地消除废水中的As（V）和Sb（V）一直是一个重大挑战。在这里，通过简单的硫化反应从水性介质中去除As（V）和Sb（V）制备了硫化改性的α-FeO​​OH吸附剂。与原始的α-FeO​​OH相比，经硫化改性的α-FeO​​OH将As（V）的吸附量从153.8增加到384.6 mg / g，将Sb（V）的吸附量从277.8增加到1111.1 mg / g。两者的As（V）和Sb（V）的吸附增强的保持在该pH范围从2至11，并且不通过各种共存阴离子如Cl干扰^-，SO ₄ ^2-，NO ₃ ^- ，的SiO ₃ ^{2 -}和PO ₄ ^3-。对As（V）和Sb（V）的吸附亲和力分别从0.0047增加到0.0915，从0.0053增加到0.4091。X射线光电子能谱研究表明，在硫化过程中，经α-FeO​​OH改性后，As（V）还原为As（III），但Sb（V）形态无明显变化。As（V）的去除机理是还原，然后通过羟基吸附，但主要是表面络合参与了Sb（V）的去除。这项研究提出了一种简单的策略，通过硫化改性来提高α-FeO​​OH对As（V）/ Sb（V）的吸附能力和吸附亲和力。