Ultra-high efficient pH induced selective removal of cationic and anionic dyes from complex coexisted solution by novel amphoteric biocomposite microspheres

Wang, Bingjie; Yang, Xiaoyang; Ma, Liang; Zhai, Linlin; Xuan, Jin; Liu, Changjun; Bai, Zhishan

doi:10.1016/j.seppur.2019.115922

Cited by 61 publications

(18 citation statements)

References 51 publications

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“…The binding energy increased most significantly after adsorption of Cr(III), which means that oxygen atoms were preferential adsorption sites for Cr(III). The changes of binding energy peak value were attributed to the chelating‐coordination reaction between heavy metals and oxygen atoms in C═O/P═O and C─OH/P─O, so carboxyl and phosphate, metaphosphate, pyrophosphate groups played an important role in the adsorption process of heavy metals 40 . As shown in the Figures 6, 2 mol ─OH groups were required for the adsorption of 1 mol Pb(II) while 1 mol for the other heavy metal ions.…”

Section: Resultsmentioning

confidence: 94%

High‐efficiency adsorption of various heavy metals by tea residue biochar loaded with nanoscale zero‐valent iron

Liu

Zhang

Fan

et al. 2021

Env Prog and Sustain Energy

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Nanoscale zero‐valent iron (nZVI) loaded on tea residue biochar activated with phosphoric acid composites was synthesized. This adsorbent can efficiently adsorb multiple heavy metal ions such as Pb (II), Cr (III), Cu (II), and Ni (II) simultaneously. The adsorption process was found to follow the pseudo‐second‐order kinetic model. Equilibrium adsorption capacities reached 288.18, 162.34, 242.72, and 267.22 mg·g−1 for Pb(II), Cr(III), Cu(II), and Ni(II), respectively. The common interfering ions exhibited lower influence on its adsorption capacity. The adsorption mechanism includes reduction, ion exchange, surface complexation and precipitation. Furthermore, the waste adsorbent was converted into a catalyst in situ, which could catalyze the degradation of Congo red by establishing an electron transfer pathway. This research provides a new concept for the sustainable utilization of industrial tea residues and the harmless treatment of waste nZVI composite adsorbents.

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Section: Resultsmentioning

confidence: 94%

High‐efficiency adsorption of various heavy metals by tea residue biochar loaded with nanoscale zero‐valent iron

Liu

Zhang

Fan

et al. 2021

Env Prog and Sustain Energy

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“…In general, an advantageous specific surface area of 21.7 m 2 /g and wide range distribution of pore size of N-CM can be available for the physisorption of MB and RB19 via the surface diffusion and the pore pilling [ 21 ]. Further, the sp 2 /sp 3 hybridized structure, and surface functional groups including –COOH, –OH and –NH 2 , may provide the chemisorption for MB and RB19 by the π-π stacking, electrostatic attraction and hydrogen bonding [ 1 , 11 ], which is presented in Figure 6 . When the solution pH was lower than pH pzc , the surface of N-CM was positively charged ( Figure 1 g), which endowed anionic RB19 with beneficial electrostatic attraction adsorption, leading to the high adsorption capacity [ 7 ].…”

Section: Resultsmentioning

confidence: 99%

“…The dyes can enter the human body via the biologic chains due to their non-degradation, bioaccumulation and high water-solubility [ 9 ]. Then they can cause serious diseases because of the inherent toxicity, such as skin irritation, permanent blindness, mutation, cardiovascular disease, and mental disorders [ 7 , 10 , 11 ]. Thus, it is imperative to come up with effective strategies to separate these pollutants from wastewater before discharging.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behaviors of Cationic Methylene Blue and Anionic Reactive Blue 19 Dyes onto Nano-Carbon Adsorbent Carbonized from Small Precursors

et al. 2022

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In this work, an innovative nano-carbon material (N-CM) adsorbent was reported for exploring its adsorption behaviors toward cationic methylene blue (MB) and anionic reactive blue 19 (RB19) pollutants. The proposed N-CM was synthesized by a one-step solvothermal treatment of citric acid and zinc gluconate small precursors. N-CM consists of nanosheets that have an advantageous specific surface area, large sp2/sp3 hybridized domains, and abundant nitrogen/oxygen-containing surface functional groups. The synergistic effects of these features are conducive to the MB and RB19 adsorption. Different from anionic RB19 adsorption (79.54 mg/g) by the cooperative π-π stacking and hydrogen bonding, cationic MB adsorbed onto N-CM mainly by the electrostatic attraction at the natural pH solution (> pHpzc), with an adsorption capacity up to 118.98 mg/g. Interestingly, both MB and RB19 adsorption conformed to the pseudo-second order kinetic (R2 ≥ 0.995) and Langmuir isothermal (R2 ≥ 0.990) models, accompanied by similar maximum monolayer adsorption capacities of 120.77 and 116.01 mg/g, respectively. Their adsorption processes exhibited spontaneously endothermic characteristics. Moreover, N-CM showed superior selective capability toward MB in different mixed dye systems, with high removal efficiencies of 73–89%. These results demonstrate that the high-performance carbon adsorbent prepared from small precursors via low-temperature carbonization shows great potentials in wastewater treatment.

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“…The adsorption tests were performed with Hy01 by varying the pH of the colored solution to acidic (pH 3.0) with HCl (0.1 mol L −1 ) and alkaline (pH 10.0) with NaOH (0.1 mol L −1 ). The MO dye concentration was measured using a UV-visible spectrometer (model BK-UV1800, BIOBASE) at a wavelength of 466 nm [ 37 ].…”

Section: Methodsmentioning

confidence: 99%

Hydrogels Based on Poly([2-(acryloxy)ethyl] Trimethylammonium Chloride) and Nanocellulose Applied to Remove Methyl Orange Dye from Water

et al. 2021

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Bio-based hydrogels that adsorb contaminant dyes, such as methyl orange (MO), were synthesized and characterized in this study. The synthesis of poly([2-(acryloyloxy)ethyl] trimethylammonium chloride) and poly(ClAETA) hydrogels containing cellulose nanofibrillated (CNF) was carried out by free-radical polymerization based on a factorial experimental design. The hydrogels were characterized by Fourier transformed infrared spectroscopy, scanning electron microscopy, and thermogravimetry. Adsorption studies of MO were performed, varying time, pH, CNF concentration, initial dye concentration and reuse cycles, determining that when the hydrogels were reinforced with CNF, the dye removal values reached approximately 96%, and that the material was stable when the maximum swelling capacity was attained. The maximum amount of MO retained per gram of hydrogel (q = mg MO g−1) was 1379.0 mg g−1 for the hydrogel containing 1% (w w−1) CNF. Furthermore, it was found that the absorption capacity of MO dye can be improved when the medium pH tends to be neutral (pH = 7.64). The obtained hydrogels can be applicable for the treatment of water containing anionic dyes.

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Ultra-high efficient pH induced selective removal of cationic and anionic dyes from complex coexisted solution by novel amphoteric biocomposite microspheres

Cited by 61 publications

References 51 publications

High‐efficiency adsorption of various heavy metals by tea residue biochar loaded with nanoscale zero‐valent iron

High‐efficiency adsorption of various heavy metals by tea residue biochar loaded with nanoscale zero‐valent iron

Adsorption Behaviors of Cationic Methylene Blue and Anionic Reactive Blue 19 Dyes onto Nano-Carbon Adsorbent Carbonized from Small Precursors

Hydrogels Based on Poly([2-(acryloxy)ethyl] Trimethylammonium Chloride) and Nanocellulose Applied to Remove Methyl Orange Dye from Water

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