Magnetite@poly(p-phenylenediamine) core–shell composite modified with salicylaldehyde for adsorption and separation of Mn (VII) from polluted water

Abstract

Fe3O4@PpPD) composite modified with salicylaldehyde (SA) was fabricated as adsorbent to remove Mn (VII) from wastewater. The Fe3O4 microspheres endow the adsorbent with the ability of rapid solid-liquid separation. The PpPD with acid and alkali resistance can protect Fe3O4 from corrosion while introducing a large amount of N atoms to adsorb Mn (VII). The introduction of SA increases the specific surface area and adsorption sites of the adsorbent. The effects of pH, time and temperature on the adsorption process were studied. At pH=2, the maximum adsorption capacity (Q) is as high as 148.34 mg g -1 , which is attributed to the complexation/chelation and electrostatic interaction between amino and hydroxyl groups and Mn (VII). It is found that the adsorption process conforms to the pseudo-second order kinetic model and Langmuir isotherm model. Thermodynamics researches demonstrate that the adsorption is a spontaneous endothermic process. After four adsorption cycle tests, the adsorption capacity losses only 1%. Moreover, high adsorption efficiency in river water and mixed metal ions solution proves that the prepared Fe3O4@PpPD-SA composite possesses excellent Q in removing Mn (VII).

Magnetic Core@Shell Fe3O4@Polypyrrole@Sodium Dodecyl Sulfate Composite for Enhanced Selective Removal of Dyestuffs and Heavy Metal Ions from Complex Wastewater

“…If R L is equal to 1, it is a linear adsorption process. When the value of R L is between 0 and 1, it indicates a process that promotes adsorption with a significant adsorption effect . The calculated R L values of MB, MG, RhB, CR, AR1, and Mn(VII) are 2.65 × 10 –2 , 1.67 × 10 –3 , 3.88 × 10 –2 , 5.02 × 10 –2 , 1.54 × 10 –2 , and 4.65 × 10 –2 , respectively, and all of which are between 0 and 1, indicating that the Fe 3 O 4 @PPy@SDS composite is a highly effective adsorbent for the removal of MB, MG, RhB, CR, AR1, and Mn(VII) from an aqueous solution.…”

Magnetic Core–Shell Fe3O4@polypyrrole@4-vinylpyridine Composites for the Removal of Multiple Dyes

“…Fe 3 O 4 microspheres were prepared by a simple hydrothermal method . 0.6 g of (C 3 H 3 NaO 2 ) n was added to 40 mL of distilled water and stirred thoroughly using a magnetic mixer.…”

“…The prepared Fe 3 O 4 @PPy@4-VP composites possess high adsorption performances for a variety of dyes, exhibiting a huge potential in the treatment of dyes from wastewater. 58 0.6 g of (C 3 H 3 NaO 2 ) n was added to 40 mL of distilled water and stirred thoroughly using a magnetic mixer. Similarly, 1.35 g of FeCl 3 • 6H 2 O, 2.9 g of C 6 H 5 Na 3 O 7 , and 1 g of CH 4 N 2 O were added into 40 mL of distilled water and stirred thoroughly with a magnetic stirrer to form a homogeneous yellow-green solution.…”

Research progress of MXenes and layered double hydroxides for supercapacitors

“…[115][116][117][118][119][120] LDHs have attracted extensive and in-depth research attention in the field of electrochemistry. 39,[121][122][123][124][125][126] Sarfraz et al 127 summarized and discussed the preparation method of LDHs and their latest progress in supercapacitors. Zhao et al 128 focused on summarizing the relationship between various LDH composites and material structures and electrochemical properties, and the corresponding charge storage mechanism.…”

“…LDHs have attracted extensive and in-depth research attention in the field of electrochemistry. 39,121–126 Sarfraz et al 127 summarized and discussed the preparation method of LDHs and their latest progress in supercapacitors. Zhao et al .…”