Biomass‐derived porous material synthesized by one‐step calcination method for the magnetic solid‐phase extraction of polychlorinated biphenyls in water

Abstract

Recent findings unfold that biomass materials with the micro/mesoporous structure were often treated as adsorbents for organic substances. In this work, a one‐step calcination method was adopted in the preparation of magnetic porous green bean biomass material. It has the properties of magnetism and porosity after the addition of Co(NO3)2 and high‐temperature calcination. A variety of characterizations have been operated, including energy dispersive X‐ray detector, vibrating sample magnetometer, Fourier transform infrared spectroscopy, Brunauer‐Emmett‐Teller analysis, and so on. It has a specific surface area of 168.1611 m2/g and a pore volume of 0.1764 cm3/g. The material was used in magnetic solid‐phase extraction of three polychlorinated biphenyls: 2‐chlorobiphenyl, 4‐chlorobiphenyl, and 2,2,5‐trichlorobiphenyl. Several factors were investigated, such as material amount, eluents, adsorption time, solution pH, salinity, and reusability. Under optimized conditions, good recoveries (90.24–93.34%) were achieved with the relative standard deviation in a range from 2.30 to 4.83%. Three real water samples (tap, river, and lake water) were tested to verify the accuracy of the method. This method can be successfully used in the analysis of some polychlorinated biphenyls congeners in water.

The Impact of Solution Ionic Strength, Hardness, and pH on the Sorption Efficiency of Polychlorinated Biphenyls in Magnetic Nanocomposite Microparticle (MNM) Gels

“…This significant decrease in binding capacity correlates to the general effect of ionic strength observed for the MNM gel systems. This drastic decrease in PCB binding in alkaline solutions has also been reported by Lv et al [ 50 ] for biomass-derived porous materials employed in water.…”

“…The main mechanism of interaction between the PCB 126 molecules and the surface of the MNM gels is attributed to π-π interactions between the aromatic rings present in both the sorbate and the sorbent. π-π stacking interactions have been widely documented as the mechanism enabling PCB binding with a variety of sorbents [ 32 , 33 , 34 , 46 , 48 , 50 , 51 , 52 ]. Additionally, the presence of anions in solution increases with increasing pH, allowing a different type of noncovalent interaction to occur: anion-π interactions.…”

Utilization of magnetic pomelo peel‐derived biochar for extraction and liquid chromatography‐mass spectrometry determination of opioid drugs in wastewaters

“…Biochar is defined as porous carbon material produced from the pyrolytic processing of abundant biomass. It has attracted significant interest in sample preparation [13][14][15][16][17][18][19]. For example, biochar derived from pine needles or marine algae, which acted as SPME coatings, could efficiently extract polychlorinated biphenyls and chlorobenzenes from water samples [13,14].…”

Integrated ultrasound‐assisted magnetic solid‐phase extraction for efficient determination and pre‐concentration of polycyclic aromatic hydrocarbons from high‐consumption soft drinks and non‐alcoholic beers in Iran

“…Among the proposed techniques, magnetic SPE (MSPE) has been considered by researchers in recent years as an effective method for sample preparation. In the MSPE method, the adsorbent is separated directly by an external magnet and does not require centrifugation and filtration processes, which makes the process easier and reduces costs and energy [12][13][14][15][16].…”