Green removal of pyridine from water via adsolubilization with lignosulfonate intercalated layered double hydroxide

Abstract

In this work, lignosulfonate intercalated Mg 2 Al layered double hydroxide was fabricated by coprecipitation method, which was used as a functional adsorbent for removing pyridine from wastewater. The X-ray powder diffraction and Fourier transformed infrared were carried out to investigate the structure of the product. In the removal process, the as-prepared lignosulfonate intercalated Mg 2 Al layered double hydroxide sample exhibited good adsolubilization property for pyridine, with maximum capacity of 400.8 mg g À1 in initial pyridine concentration of 400 mg/l and the removal percentage achieved about 87.9%. In addition, the influence of pH, time, and initial concentration of pyridine on the adsorption capacity was also examined. Moreover, the adsorption kinetic followed the pseudo-second-order model. Furthermore, after regeneration, the adsorbent can still show high adsorption capacity even for 10 cycles of desorptionadsorption. It hoped that lignosulfonate intercalated Mg 2 Al layered double hydroxide can be used as adsorbent for the removal of organic pollutants in wastewater.

Adsorbing Volatile Organic Chemicals by Soluble Triazine-Based Dendrimers under Ambient Conditions with the Adsorption Capacity of Pyridine up to 946.2 mg/g

“…The amide functionality of terephaloyl piperazine not only enlarges the void space of bulk dendrimers but also enhances the interaction between VOCs and the porous substrate. The adsorption capacity of 3 in pyridine is equivalent to 946.2 mg/g, a more than 2-fold increase from the reported value in the literature (400.8 mg/g) [ 20 ]. Although dendrimer 3 has a significantly smaller surface area than MOFs [ 36 , 37 , 38 , 39 , 40 ], its void space may increase in the process of adsorbing VOCs because its void pore is formed by flexible H-bonding interactions between dendritic peripheral groups, as evidenced by the liquid formation and pyridine adsorption onto bulk solid 3 .…”

“…By properly choosing a chemical shift (δ) of dendrimers as the internal standard, the peak interferences from the H 2 O and impurity in the spectra can be easily avoided, and the accuracy of the adsorbed amount of VOCs can thus be ascertained. In particular, the adsorption capacity of pyridine for 3 is about 946.2 mg/g, a more than 2-fold increase from the reported values in the literature [ 20 ].…”

“…VOCs, including aromatics, alkanes, amines, and oxygenated or halogenated hydrocarbons [ 4 , 5 , 6 ], are often produced by chemical and pharmaceutical industries [ 7 , 8 , 9 ]. Porous materials currently used for adsorbing VOCs are zeolites (Zs) [ 10 , 11 , 12 ], activated carbons (ACs) [ 13 , 14 , 15 , 16 ], polymeric resins (PRs) [ 17 , 18 , 19 , 20 ], and metal-organic frameworks (MOFs) [ 21 , 22 , 23 , 24 ]. In these systems, a pre-drying column to remove the moisture of absorbed chemicals is generally required to maintain the adsorbing efficiency [ 24 ], which is an additional cost for VOC adsorption.…”

“…In these systems, a pre-drying column to remove the moisture of absorbed chemicals is generally required to maintain the adsorbing efficiency [ 24 ], which is an additional cost for VOC adsorption. For example, pyridine easily adsorbs moisture from its surroundings, which has been ascribed to the rarely reported works of pyridine-capturing by porous materials [ 20 , 24 ]. However, pyridine, widely used in the production of pharmaceuticals and pesticides, is known to cause serious neurological injury under chronic exposure [ 25 ].…”

Pervaporation Removal of Pyridine from Saline Pyridine/Water Effluents Using PEBA-2533 Membranes: Experiment and Simulation

“…Pyridine, as one of the most important nitrogenous heterocyclic compounds, has been widely used in the manufacture of different pharmaceutical compounds, pesticides, rubber products, paints, and adhesives. , Hence, a large amount of effluents containing pyridine is also produced as a byproduct inevitably. − However, the discharge of pyridine into the environment would be harmful to the ecosystem and human beings because it could cause respiratory, heart, and nervous system diseases and is considered one of the hazardous chemicals by the United States Environmental Protection Agency . Thus, it is important to recover pyridine from wastewater, which is both beneficial to the environment and economic value. − A significant number of studies have been conducted on pyridine wastewater treatment, such as adsorption and extractive distillation. ,, However, it is difficult to recycle pyridine from a dilute aqueous solution . On the one hand, pyridine and water would form an azeotrope at 93.6 °C, with 59 wt % pyridine in it; on the other hand, pyridine is present in effluents at a low concentration, which makes the recovery of pyridine a huge challenge.…”