Preparation and performance of porous ceramsite for Ag+ removal in sewage treatment with total phosphorus tailings

Hu, Ning; Lv, Yafei; Luo, Binyu; Ye, Yicheng; Fu, Fanghui; Jia, Jun; Ou, Zhibing; Li, Jiangli

doi:10.1016/j.jclepro.2023.137515

Cited by 17 publications

(1 citation statement)

References 27 publications

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“…Lately, advanced functional adsorbents have emerged as an economically feasible method, garnering substantial attention in the realm of remediating Ag-contaminated water. , Much effort has been dedicated to develop efficient and effective adsorbents with high capacity and excellent recovery performance. , In the past few decades, a wide range of adsorbents, such as mineral materials, inorganic and organic metal oxides, and polymers, have been proven to efficiently remove Ag and other heavy metals through the formation of an inner-sphere complex with targeted contaminants. − Although these adsorbents exhibit excellent capability for Ag + adsorption, challenges persist. To guarantee the recovery efficiency of Ag + , the adsorbed Ag + on the adsorbent needs to be eluted using desorption agents, such as acid, alkali, or organic solution, or the adsorbents need to be incinerated after adsorption.…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal and Recovery of Ag from Wastewater Using Charged Polystyrene-Polydopamine Nanocoatings and Their Sustainable Catalytic Application in 4-Nitrophenol Reduction

Song,

Jian,

Qiao

et al. 2024

ACS Appl. Mater. Interfaces

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This study addresses the long-standing challenges of removing and recovering trace silver (Ag) ions from wastewater while promoting their sustainable catalysis utilization. We innovatively developed a composite material by combining charged sulfonated polystyrene (PS) with a PDA coating. This composite serves a dual purpose: effectively removing and recovering trace Ag + from wastewater and enabling reused Ag for sustainable applications, particularly in the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The PS−PDA demonstrated exceptional selectivity to trace Ag + recycling, which is equal to 14 times greater than the commercial ion exchanger. We emphasize the distinct roles of different charged functional groups in Ag + removal and catalytic reduction performance. The negatively charged SO 3 H groups exhibited the remarkable ability to rapidly enrich trace Ag ions from wastewater, with a capacity 2−3 times higher than that of positively-N + (CH 3 ) 3 Cl and netural-CH 2 Clmodified composites; this resulted in an impressive 96% conversion of 4-NP to 4-AP within just 25 min. The fixed-bed application further confirmed the effective treatment capacity of approximately 4400 L of water per kilogram of adsorbent, while maintaining an extremely low effluent Ag + concentration of less than 0.1 mg/L. XPS investigations provided valuable insights into the conversion of Ag + ions into metallic Ag through the enticement of negatively charged SO 3 H groups and the in situ reduction facilitated by PDA. This breakthrough not only facilitates the efficient extraction of Ag from wastewater but also paves the way for its environmentally responsible utilization in catalytic reactions.

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