Insight into the synthesis and adsorption mechanism of adsorbents for efficient phosphate removal: Exploration from synthesis to modification

Du, Meng; Zhang, Yueyan; Wang, Zeyi; Lv, Mengran; Tang, Aiping; Yang, Yu; Qu, Xuanhui; Chen, Zhiqiang; Wen, Qinxue; Li, Ang

doi:10.1016/j.cej.2022.136147

Cited by 79 publications

(23 citation statements)

References 119 publications

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“…To date, numerous techniques and methods including biological processes, ion exchange, chemical precipitation, reverse osmosis, and adsorption − have been used for phosphate treatment from water. Among them, adsorption has emerged as one of the most promising methods for removing phosphate from wastewater due to its high efficiency, cost-effectiveness, ease of operation, lack of secondary contamination, and high removal efficiency at low phosphate concentrations . The core of the adsorption process is the adsorbent, which impacts adsorption performance in four aspects: adsorption capacity, adsorption selectivity, adsorption/desorption rate, and regeneration .…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Removal of Phosphate from Wastewater Using Lignin-Based Adsorbent Modified with Lanthanide: Characterization, Performance, and Mechanisms

Zhang

Mai

Xian

et al. 2022

Ind. Eng. Chem. Res.

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Water eutrophication due to the discharge of wastewater containing phosphate has aroused considerable concern around the world, and adsorption has been identified as one of the viable solutions to solve the problem. It is crucial to develop an eco-friendly and cost-effective adsorbent for preventing eutrophication of water bodies. In this study, we developed a simple coprecipitation approach to prepare a lanthanum-based modified calcium lignosulfonate (La-CL) for treating phosphate wastewater. La-CL exhibited excellent adsorption ability for phosphate due to its high loading of lanthanum (59.29%) and large specific surface area (175.3 m2 g–1). In a wide range of pH values (2–11), the adsorption capacity of phosphate onto La-CL remained stable, and the removal rate was above 90%. The maximum adsorption capacity could reach 107 mg g–1 for phosphate at optimum pH = 7, and the adsorption reached equilibrium within 240 min. After seven consecutive regeneration adsorption experiments, La-CL could still maintain a desorption rate of more than 75%, indicating that La-CL exhibited a certain degree of regenerative performance. Moreover, the adsorption behaviors of phosphate onto the La-CL adsorbents were fitted to the Freundlich isotherm and pseudo-second-order model, suggesting chemical adsorption and a heterogeneous adsorption process. The mechanistic studies revealed that ligand exchange played a significant role in the adsorption of phosphate. This study would provide a strategy of “treating waste with waste” for removing phosphate from wastewater at low concentrations based on La-CL.

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Section: Introductionmentioning

confidence: 99%

Adsorption and Removal of Phosphate from Wastewater Using Lignin-Based Adsorbent Modified with Lanthanide: Characterization, Performance, and Mechanisms

Zhang

Mai

Xian

et al. 2022

Ind. Eng. Chem. Res.

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“…3 However, a large amount of phosphate discharge leads to eutrophication of the water body, which accelerates the reproduction of harmful algae and destroys the self-purification ability of the water body. 4 There are severe impacts on human health and ecosystems. [5][6][7] Therefore, it is necessary to reduce the negative effects of eutrophication in water bodies by removing phosphate from wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…show that the adsorption process is spontaneous and endothermic. MgAl-LDH@ZIF-8 has a high adsorption capacity over a wide pH range (3)(4)(5)(6)(7). Except for CO 3 2À , other coexisting ions (Cl À , SO 4 2À , and NO 3…”

mentioning

confidence: 99%

Synthesis of MgAl-LDH@ZIF-8 composites by in situ growth method for highly efficient phosphate removal

et al. 2022

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“…Magnetic adsorbents can effectively resolve this issue. Magnetic adsorbents are dispersed in the liquid during adsorption process, and are magnetically separated after the reaction, thereby the clogging of adsorption column could be avoided [ 27 ]. Previously, we prepared a novel adsorbent, magnetic zirconia (MZ).…”

Section: Introductionmentioning

confidence: 99%

“…Previously, we prepared a novel adsorbent, magnetic zirconia (MZ). The saturated magnetization of MZ is 23.65 emu/g, which enabled the magnetic separation after use [ 27 ]. The maximum P adsorption capacity is 42.19 mg/g, being higher or at least comparable with the recently reported Zr-containing adsorbent [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

High Purity Struvite Recovery from Hydrothermally-Treated Sludge Supernatant Using Magnetic Zirconia Adsorbent

Wang

Guan

Wang

et al. 2022

IJERPH

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Recovery of phosphorus from sludge will help to alleviate the phosphorus resource crisis. However, the release of phosphorus from sludge is accompanied by the leaching of large amounts of coexisting ions, i.e., Fe, Al, Ca, and organic matter, which decreases the purity of sludge-derived products. In this study, an adsorption-desorption process using magnetic zirconia (MZ) as the adsorbent is proposed to obtain a high purity recovery product. The process involves selective adsorption of phosphate from the hydrothermally treated sludge supernatant (HTSS) using MZ, followed by desorption and precipitation to obtain the final product: struvite. The results indicated that at a dosage of 15 g/L, more than 95% of phosphorus in the HTSS could be adsorbed by MZ. Coexisting ions (Ca2+, Mg2+, Fe3+, Al3+, SO42−, NO3−, Cl−, etc.) and organic matter (substances similar to fulvic and humic acid) in the HTSS had a limited inhibitory effect on phosphate adsorption. Using a binary desorption agent (0.1 mol/L NaOH + 1 mol/L NaCl), 90% of the adsorbed phosphorus could be desorbed. Though adsorption-desorption treatment, struvite purity of the precipitated product increased from 41.3% to 91.2%. Additionally, MZ showed good reusability, maintaining a >75% capacity after five cycles. X-ray photoelectron spectroscopy (XPS) indicated that MZ adsorbed phosphate mainly by inner-sphere complexation. This study provided a feasible approach for the recovery of phosphorus from sludge with high purity.

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Insight into the synthesis and adsorption mechanism of adsorbents for efficient phosphate removal: Exploration from synthesis to modification

Cited by 79 publications

References 119 publications

Adsorption and Removal of Phosphate from Wastewater Using Lignin-Based Adsorbent Modified with Lanthanide: Characterization, Performance, and Mechanisms

Adsorption and Removal of Phosphate from Wastewater Using Lignin-Based Adsorbent Modified with Lanthanide: Characterization, Performance, and Mechanisms

Synthesis of MgAl-LDH@ZIF-8 composites by in situ growth method for highly efficient phosphate removal

High Purity Struvite Recovery from Hydrothermally-Treated Sludge Supernatant Using Magnetic Zirconia Adsorbent

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