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a XRD pattern of CMS-P, b FT-IR spectra of CMS before and after phosphate adsorption. XPS patterns of CMS before and after adsorption: c survey scan and d P 2p
Source publication
Herein, magnesite slags (MS), which remain after sulfuric acid extraction from light burnt magnesite in the magnesite industry, were used as phosphate adsorbents in wastewater. The MS were calcined under 700 °C to enhance phosphate adsorption. The calcined magnesite slags (CMS) were characterized by nitrogen adsorption–desorption isotherm, X-ray di...
Citations
... Hence, it is urgently desirable to efficiently and environmentally remove dyes from wastewater. Until now, numerous methods have been developed for wastewater purification, including flocculation [6], adsorption [7], chemical oxidation [8], biodegradation [9], membrane separation [10] and electrochemical methods [11], etc. Among these techniques, adsorption is considered as a promising water treatment technique, due to its flexibility, ease of implementation, costeffectiveness and wide practicality [12][13][14]. ...
A novel magnetic graphene nanocomposites (MGN) was fabricated via a environment-friendly electrochemical exfoliation in Fe2(SO4)3 aqueous solutions. Ferrous sulfate in the electrolyte had the potential to enhance both the exfoliation efficiency of graphite and the in-situ magnetization of graphene. The as-obtained MGN-700 °C was explored as an adsorbent for the removal of Congo red (CR) from aqueous solutions. The adsorption equilibrium was rapidly achieved in 20 min, and the kinetic adsorption was well fitted with the pseudo-second-order kinetic model. Meanwhile, the adsorption isotherms followed the Freundlich model with a maximum capability of 582 mg g⁻¹ for CR. Moreover, thermodynamic study indicated that the adsorption process was spontaneous and exothermic. Characterizations of the adsorbent suggested that the adsorption mechanisms of CR onto MGN-700 °C mainly involved hydrogen bond, electrostatic interaction and π–π stacking. After five cycles of adsorption/desorption, the removal efficiency of CR onto MGN-700 °Cremained at approximately 80%, demonstrating its excellent reusability. Furthermore, the adsorbent exhibited high adsorption capacity and a ferromagnetic feature, indicating its potential practical application in dye wastewater treatment.
Graphical Abstract
... Adsorption is considered as one of the most promising technologies for contaminant removal owing to its advantages of low cost, high efficiency and simple operation [7,8]. For the adsorption process, developing adsorbent with high adsorption capacity and low-cost is the critical factor to deal with pollutants efficiently [9]. ...
... These results were in close agreement with the kinetics experimental prospects. The maximum adsorption capacity values for Cd(II) of MgO-BC-10 and MgO-BC-20 were 623.3 and 889.4 mg/g, respectively [52][53][54]. Significantly, the enhancement of adsorption capacity from MgO-BC-10 to MgO-BC-20 indicates the acceleration of adsorption with Mg(NO 3 ) 2 activating. Additionally, the adsorption capacity of MgO-BC-20 was higher than many reported data in other literatures (Table S4). ...
MgO-modified biochar (MgO-BC) has demonstrated enormous potential for practical application of Cd(Ⅱ) removal from wastewater. Exceptionally numerous MgO adsorption sites and enhanced porosity of MgO-BC are both critical for efficiency Cd(Ⅱ) removal. However, the pursuit of high-content of MgO while maintaining unobstructed pore structure remains a challenge due to the blockage of BC pores by the MgO particles. Herein, we demonstrated that Mg(NO3)2 can synergistically enhance the porosity and MgO active site of biochar attributing to the oxidation of nitrate. The prepared MgO-BC exhibits highly porous framework structure. Remarkably, further adsorption results indicate the MgO-BC has outstanding adsorption capacity of Cd(Ⅱ) in solution. The immobilized contaminant Cd(Ⅱ) onto MgO-BC was predominantly attributable to the chemical and physical interaction, including ion exchange, cation-π interaction, surface complexation and electrostatic interaction. This strategy demonstrates a novel route to develop efficient adsorbents by tailoring structure and metal oxide via nitrate activation.
... Fig. S2 shows powder X-ray diffraction (XRD) patterns for the biochar and MgObiochar. There were five obvious peaks at the 2θ values of 36.7 • , 42.8 • , 62.2 • , 74.4 • , and 78.4 • in the spectra of MgO-biochar, which were consistent with the phase of MgO (JCPDS card No. 45-0946) (Liang et al., 2022). The presence of MgO peaks indicated the formation of MgO during the ISAM approach. ...
Engineering magnesium oxide (MgO)-modified biochar (MgO-biochar) with high porosity and active MgO load is a feasible pathway to enhance phosphate adsorption capacity. However, the blockage to pores caused by MgO particles is ubiquitous during the preparation, which seriously impaired the enhancement in adsorption performance. In this research, with the intent to enhance phosphate adsorption, an in-situ activation method based on Mg(NO3)2-activated pyrolysis technology was developed to fabricate MgO-biochar adsorbents with abundant fine pores and active sites simultaneously. The SEM image revealed that the tailor-made adsorbent has well-developed porous structure and abundant fluffy MgO active sites. Its maximum phosphate adsorption capacity was coming up to 1809 mg/g. The phosphate adsorption isotherms are in accordance well with the Langmuir model. The kinetic data, which agreed with the pseudo-second-order model, indicated that chemical interaction is existing between phosphate and MgO active sites. This work verified that the phosphate adsorption mechanism on MgO-biochar was composed of protonation, electrostatic attraction, monodentate complexation and bidentate complexation. In general, the facile in-situ activation method using Mg(NO3)2 pyrolysis illuminated biochar activation with fine pores and highly efficient adsorption sites for efficient wastewater treatment.
The ability of modern agriculture to meet future food demand imposed by accelerating growth of the world's population is a major challenge, and fertilizers play a key role by replacing nutrients in agricultural soil. Given the need for fertilizers, their cost in nonrenewable resources and energy, and the consequences of the greenhouse gas emissions required to make them, people have begun to explore ways to make fertilizer manufacturing and use more sustainable. Using data from the CAS Content Collection, this review examines and analyzes the academic and patent literature on sustainable fertilizers from 2001 to 2021. The breakdown of journal and patent literature publication over time on this topic, country or region of publications, the substances included in published research, among other things allow us to understand the general progress in the field as well as the classes of materials and concepts driving innovation. We hope that this bibliometric analysis and literary review will assist researchers in relevant industries to discover and implement ways to supplement conventional fertilizers and nutrient sources while improving the efficiency and sustainability of waste management and ammonia production.
The ability of modern agriculture to meet future food demand imposed by accelerating growth of the world’s population is a major challenge, and fertilizers play a key role by replacing nutrients in agricultural soil. Given the need for fertilizer, its costs in nonrenewable resources and energy, and the consequences of the CO2 emissions required to make it, people have begun to explore ways to make fertilizer manufacture and use more sustainable. Using data from the CAS Content Collection™, this review examines and analyzes the academic and patent literature on sustainable fertilizers from 2001-2021. The breakdown of journal and patent literature publication over time on this topic, country or region of publications, the substances included in published research, among other things, allows us to understand the general progress in the field, as well as the classes of materials and concepts driving innovation. We hope that this bibliometric analysis and literary review will assist researchers in relevant industries to discover and implement ways to supplement conventional fertilizers and nutrient sources while improving the efficiency and sustainability of waste management and ammonia production.
Activating adsorbents with abundant pores and active sites is key to achieving efficient removal of pollutants from wastewater. However, the activation of stable magnesite slag (MS) to synergistically enhance its porosity and active sites is challenging. Herein, modified magnesite slag (MMS) was prepared using a facile nitrate-Activation process (NAP) from MS to enhance its porosity and active sites. After NAP treatment, the morphology of the MMS wastes became highly porous with abundant MgO active sites. The MMS exhibited an outstanding maximum adsorption capacity of 836.2 mg/g. The impact of pH, adsorption time and initial solution concentrations on the adsorption capacity of phosphate was investigated systematically. The results revealed that weak acidic solution was beneficial to phosphate adsorption of MMS. The phosphate adsorption mechanism on MMS was mainly attributed to chemisorption. Moreover, NAP may be an effective method to activate MS adsorbents for phosphate removal from wastewater
