Preparation of a novel hafnium-loaded Fe3O4@SiO2 superparamagnetic nanoparticles and its adsorption performance for phosphate in water

Zhao, Gege; Zhao, Qian; Jin, Xinwei; Wang, Hongbo; Zhang, Kefeng; Li, Mei; Wang, Ning; Zhao, Wenxiu; Meng, Shujuanig; Mu, Ruimin

doi:10.5004/dwt.2021.26801

Cited by 3 publications

(4 citation statements)

References 37 publications

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“…Additionally, the presence of Fe 3 O 4 was also confirmed by the peaks (311), (400), (511), and (440) (PDF#88-0315-1). It is worth noting that the XRD pattern in the Psorbent p , reported by Zhao et al [30], presented ordinary metal oxides rather than obvious, typical, and distinct reflections of the LDH structure. Furthermore, the reflection peaks of (220), ( 400), (222), and (622) matched the existence of doped NR La-Si and corresponded to La 9.33 Si 6 O 26 (PDF#49-0443).…”

Section: Characterization Of P-sorbent D and Property Variation Durin...mentioning

confidence: 83%

“…The sludge was obtained from the plain sedimentation tank, where the coagulant of polymer aluminum chloride was dosed, with a slight brick-red color and a pH of about 8.23. The synthesis of Fe 3 O 4 particles and Fe 3 O 4 @SiO 2 microspheres according to the co-precipitation method, as elaborated previously, was as follows [30,43]: The DWTS was dissolved with HCl (2 mol/L) with a ratio of DWTS to HCl solution of 0.1 g: 1 mL. It was then filtered with 0.45 µm membrane.…”

Section: Re-synthesis Of P-sorbents With Dwtsmentioning

confidence: 99%

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Sludge-Based Superparamagnetic Nano-Sorbent Functionalized by Lanthanum Silicate Nanorods for Phosphorus Adsorption and Fertilization

Zhao,

Wang,

Ren

et al. 2024

Recycling

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Phosphorus (P) recovery from wastewater is considered to be a positive human intervention towards sustainable P use in the global P cycle. This study investigated the feasibility of synthesizing a superparamagnetic nano-sorbent that was functionalized by lanthanum silicate nanorods (NRLa-Si) using drinking water treatment sludge (DWTS), evaluating both its P adsorption capacity and fertilization effect. The DWTS-based La-modified P nano-sorbent (P-sorbent D) exhibited complicated but single-layer-dominant adsorption for phosphate, with a maximum adsorption capacity up to 26.8 mg/g, which was superior to that of most of the similar sludge-based P-sorbent. The NRLa-Si-modified P-sorbent D was identified with several characterization techniques and the leaching metal elements from the nano-sorbent were tested, which were below the limits proposed by the Food and Agriculture Organization of the United Nations. In addition, the growth and vigorousness of Arabidopsis thaliana indicated that the exhausted P-sorbent D could be used as a potential water-soluble moderate-release P fertilizer, which was also confirmed by the well-fitted P uptake model and the P desorption pattern from the sorbent–fertilizer. The doped lanthanum silicate nanorods could play the dual role of P complexation enhancement and health/growth promotion. In light of this, this study proposed a new way of reclaiming DWTS as a P-sorbent for fertilization, offering new insights into the path toward “closing the P loop”.

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Section: Characterization Of P-sorbent D and Property Variation Durin...mentioning

confidence: 83%

Section: Re-synthesis Of P-sorbents With Dwtsmentioning

confidence: 99%

Sludge-Based Superparamagnetic Nano-Sorbent Functionalized by Lanthanum Silicate Nanorods for Phosphorus Adsorption and Fertilization

Zhao,

Wang,

Ren

et al. 2024

Recycling

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“…It has been confirmed that SNS showed high selective capture ability and strong regeneration performance for phosphate even in the presence of coexisting ions such as nitrate, chloride ion, sulfate, etc. [10,18]. However, the LDH on the SNS surface exhibited strong affinity with the protein or soluble microbial by-product-like colloids in the DOM compo-nents.…”

Section: Mechanismmentioning

confidence: 99%

“…SNS is easy to be separated from the liquid phase in a magnetic field. After being modified with various transitional metals, SNS could sequestrate P with high adsorption capacity [9][10][11]. Selectively, SNS has been found to exhibit high selectivity in the presence of competing ions due to the stronger complexation between phosphate and LDH loaded on SNS.…”

Section: Introductionmentioning

confidence: 99%

Complex Agent for Phosphate Sequestration from Digested Sludge Liquor: Performances and Economic Cost Analysis

Shi

Nie

Ren³

et al. 2023

Processes

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Phosphorus (P) management in the “water-energy-resource-nexus” in wastewater treatment plants (WWTPs) remains a longstanding challenge. P adsorption from the P-enriched digested sludge liquor (DSL) is a comparatively more practical and economically viable approach for P recovery in WWTPs. However, high concentrations of impurities in DSL might pose a negative and interferential effect on P adsorption, hindering the application of sorbents or precipitation methods. Given such a situation, highly efficient and cost-effective sorbent towards P reclamation from DSL is highly needed. Therefore, this study aims to develop a novel complex agent containing aluminum coagulant and superparamagnetic nano-sorbent (SNS) that can be used in magnetic seeding coagulation for P recovery. The complex agents with different PACl: SNS ratios showed varied turbidity removal rates and P recovery efficiencies and the optimal ratio was 15 mg PACl: 15 g SNS. PAC and SNS showed significant interaction because PAC could enhance P adsorption by shielding the interferential effect of colloidal impurities. In addition, the complex is highly regenerative, with turbidity and P removal rate stably maintained at 70–80% after 10 adsorption/regeneration cycles. The cost–benefit analysis of the dosing complex agent showed a dosing cost of 0.154 EUR/m3, admittedly much higher than the conventional magnetic seeding coagulation, which could probably be covered by the profit if the expensive and rare P product is reclaimed. This work indicated that the complex agent was superior due to its high adsorption capacity, easy separation, and repeated dosing, and therefore had the potential for P recovery from DSL.

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Towards low energy-carbon footprint: Current versus potential P recovery paths in domestic wastewater treatment plants

Zhao

Hao

Liu

et al. 2023

Journal of Environmental Management

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Preparation of a novel hafnium-loaded Fe3O4@SiO2 superparamagnetic nanoparticles and its adsorption performance for phosphate in water

Cited by 3 publications

References 37 publications

Sludge-Based Superparamagnetic Nano-Sorbent Functionalized by Lanthanum Silicate Nanorods for Phosphorus Adsorption and Fertilization

Sludge-Based Superparamagnetic Nano-Sorbent Functionalized by Lanthanum Silicate Nanorods for Phosphorus Adsorption and Fertilization

Complex Agent for Phosphate Sequestration from Digested Sludge Liquor: Performances and Economic Cost Analysis

Towards low energy-carbon footprint: Current versus potential P recovery paths in domestic wastewater treatment plants

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