Preparation and Application of a Novel Functionalized Coconut Coir Pith as a Recyclable Adsorbent for Phosphate Removal

Phosphorus recovery from agricultural waste via cactus pear biomass

“…Within the range of 3700–2500 cm −1 , a broad absorption band is observed, indicating the intramolecular vibrational stretching of the –OH groups, which are extensively engaged in hydrogen bonding. Furthermore, weak peaks at 2842 and 2932 cm −1 can be attributed to the symmetric and asymmetric stretching vibrations of the C–H bonds in the CH 3 and CH 2 groups, respectively [ 22 ]. Transitioning below 2000 cm −1 , a series of broad bands between 1730 and 1500 cm −1 become evident.…”

“…In our biomass, the zeta potential versus pH curve for the sorbent surface shows slightly negative charge at low pH (<5.0), a strongly negative at higher pH (>6.0) and values close to zero around pH 5.5–5.8. It is widely acknowledged that anions tend to be adsorbed more effectively at pH values lower than pH at PZC, as, during these pH ranges, functional groups on the adsorbent surface are likely to carry a positive net charge [ 22 ]. Conversely, when the pH is higher than the pH at PZC the surface charge becomes negative, allowing cations to be adsorbed.…”

“… b Total energy input needed for the specific treatment: + low, ++ medium, +++ high. c References: [ 22 ] Faraji et al, 2020; [ 25 ] Lim et al, 2012; [ 50 ] Kalemelawa et al, 2012; [ 51 ] Khatua et al, 2018; [ 52 ] Mago et al, 2021; [ 53 ] Li et al, 2020; [ 54 ] Torma et al, 2018; [ 55 ] Ma et al, 2020; [ 56 ] Ozdemir et al, 2017; [ 57 ] Guerrero et al, 1995; [ 58 ] Akinbile et al, 2018; 21 Fang et al, 2020; [ 59 ] Quisperima et al, 2022; [ 60 ] Xiong et al, 2021; [ 61 ] Sharmin et al, 2021; 27 Melia et al, 2019; [ 62 ] Pasquali et al, 2018; [ 63 ] Wan et al, 2016; [ 64 ] Shilpi et al, 2019; [ 65 ] Tabinda et al, 2021; [ 66 ] Yin et al, 2019; [ 67 ] Liao et al, 2022; [ 68 ]; Manca et al, 2020 [69]. …”

Development of Functional Adsorbent From Textile Cotton Waste by Radiation Induced Grafting Process: Equilibrium and Kinetic Studies of Acid Dye Adsorption

“…The adsorbents like activated carbon have high cost while adsorbents of natural origin suffer from low adsorption capacity. The need is for a cost-effective, recyclable adsorbent system which can treat high concentration of dyes usually found in industrial wastewater effluents (10)(11)(12).…”