Biochar-supported starch/chitosan-stabilized nano-iron sulfide composites for the removal of lead ions and nitrogen from aqueous solutions

Wang, Hai; Liu, Renrong; Chen, Qian; Mo, Yiwei; Zhang, Yaohong

doi:10.1016/j.biortech.2022.126700

Cited by 73 publications

(11 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the adsorption process of NH 4 + by general biochar, the adsorption capacity first increases and then decreases with increasing pH value. The adsorption capacity of the four biochars prepared by Wang et al [ 120 ] gradually increased in solutions with pH ranging from 3 to 6, while it decreased in the pH range of 6 to 10. However, other studies [ 48 ] have found that the removal efficiency of NH 4 + increases at pH values of 9 to 11, as shown in Figure 9 .…”

Section: Factors Affecting Adsorption Of Nitrogen and Phosphorus By B...mentioning

confidence: 99%

“…The reaction rate accelerated with increasing temperature. Wang et al [ 120 ] used four kinds of biochars to adsorb NH 4 + -N. They found that both ΔG and ΔH were positive values, in which ΔG decreased with increasing temperature, indicating that increasing the reaction temperature was beneficial to the adsorption process. The reaction entropy changed ΔS > 0, which could increase the disorder and freedom of the solid–liquid interface during the adsorption process.…”

Section: Factors Affecting Adsorption Of Nitrogen and Phosphorus By B...mentioning

confidence: 99%

See 1 more Smart Citation

Efficient Adsorption of Nitrogen and Phosphorus in Wastewater by Biochar

Wu,

Quan,

Chen

et al. 2024

Molecules

View full text Add to dashboard Cite

Nitrogen and phosphorus play essential roles in ecosystems and organisms. However, with the development of industry and agriculture in recent years, excessive N and P have flowed into water bodies, leading to eutrophication, algal proliferation, and red tides, which are harmful to aquatic organisms. Biochar has a high specific surface area, abundant functional groups, and porous structure, which can effectively adsorb nitrogen and phosphorus in water, thus reducing environmental pollution, achieving the reusability of elements. This article provides an overview of the preparation of biochar, modification methods of biochar, advancements in the adsorption of nitrogen and phosphorus by biochar, factors influencing the adsorption of nitrogen and phosphorus in water by biochar, as well as reusability and adsorption mechanisms. Furthermore, the difficulties encountered and future research directions regarding the adsorption of nitrogen and phosphorus by biochar were proposed, providing references for the future application of biochar in nitrogen and phosphorus adsorption.

show abstract

Section: Factors Affecting Adsorption Of Nitrogen and Phosphorus By B...mentioning

confidence: 99%

Section: Factors Affecting Adsorption Of Nitrogen and Phosphorus By B...mentioning

confidence: 99%

Efficient Adsorption of Nitrogen and Phosphorus in Wastewater by Biochar

Wu,

Quan,

Chen

et al. 2024

Molecules

View full text Add to dashboard Cite

show abstract

“…The main peak of N 1s on the sample of ECL, La-ECL, and La/CTAC-ECL could be divided into Three characteristic peaks at 398.42, 399.82, and 400.77 eV (Supplementary Figure S2), which were assigned to sp2-hybridized N (-N=C-), benzene amine (-NH 2or -NH-) and ternary N (N-C 3 ) groups, respectively. The percentage of benzene amine (-NH 2or -NH-) in the ECL, La-ECL, and La/CTAC-ECL after NO 3 − adsorption declined (Figure 8), suggesting that nitrate was removed from the aqueous solution by electrostatic attraction (Wang et al, 2022). Additionally, the N 1s binding energy of the N-O in the La/ CTAC-ECL decreased by 0.31 eV after NO 3 − adsorption (Supplementary Figure S2, Figure 8), indicating that a chemical bond may be formed between NO 3 − and CTAC.…”

Section: Possible No 3 − Removal Mechanismmentioning

confidence: 99%

Remediation of nitrate contaminated groundwater using a simulated PRB system with an La–CTAC–modified biochar filler

Wu²,

Nie³

et al. 2022

Front. Environ. Sci.

View full text Add to dashboard Cite

In the present study, the Erigeron canadensis L., a typical invasive plant in Southwest China, was utilized as the raw material to prepare original biochar (ECL), a rare earth element La–modified biochar (La–ECL), and a rare earth element La coupling cationic surfactant [cetyltrimethylammonium chloride (CTAC)]–modified biochar (La/CTAC–ECL). These materials were then added to simulated permeable reactive barriers (PRBs) and their nitrate (NO3−) contaminant remediation performances were evaluated in groundwater. The results show that the breakthrough time for NO3− in a simulated PRB column increases as the concentration of the influent NO3− and the flow rate decreases, whereas with the increases of filler particle size and the height of the filler in the column initially increases, and then decreases. Considering an initial NO3− concentration of 50 mg L−1, and a filler particle size range of 0.8–1.2 mm, the maximum adsorption capacity of the La/CTAC–ECL column for NO3− is 18.99 mg g−1 for a filler column height of 10 cm and an influent flow rate of 15 ml min−1. The maximum quantity of adsorbed NO3− of 372.80 mg is obtained using a filler column height of 15 cm and an influent flow rate of 10 ml min−1. The Thomas and Yoon–Nelson models accurately predict the breakthrough of NO3− in groundwater in the simulated PRB column under different conditions, and the results are consistent with those from dynamic NO3− adsorption experiments. TEM, XRD, FTIR, and XPS analyses demonstrate that the modification using the La and CTAC improves the surface structure, porosity, permeability, and configuration of functional groups of the biochar. The mechanisms of NO3− removal from groundwater using the La/CTAC–ECL include pore filling, surface adsorption, ion exchange, and electrostatic adsorption. The composite La/CTAC–ECL exhibits a superior potential for the remediation of NO3− contaminated groundwater.

show abstract

“…Introducing new functional groups on cellulose can also provide more active sites to form imprinted sites. Chitosan (CS) is a kind of natural macromolecular polymer with good biocompatibility and no harm to environment (Wang et al, 2022a). It is widely available in nature.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of imprinted bacterial cellulose aerogel for efficient recovery of Er(III) from end-of-life erbium-doped fibers

Zheng

Wang

et al. 2022

Preprint

View full text Add to dashboard Cite

Selective recovery of high value rare earth elements from end-of-life rare earth products is an economical and environmental measure. In this study, we used bio-based material (2,2,6,6-tetramethyl-1-piperidinyloxy-mediated bacterial cellulose) as the substrate material to construct a highly elastic imprinted bacterial cellulose aerogel (BCP-I) in synergy with chitosan (CS) and polyethyleneimine (PEI) for highly selective adsorption Er(III). CS and PEI contain abundant functional monomers, which can cooperate with bacterial cellulose and Er(III) to construct more imprinting sites, which not only improves the adsorption performance of BCP-I, but also makes the aerogel more stable. In order to analyze physical and chemical properties of aerogels, it was characterized by scanning electron microscope, fourier transform infrared spectrometer and thermogravimetric analysis. Adsorption experiments showed that BCP-I had a good adsorption effect on Er(III), and the maximum adsorption capacity could reach 95.99 mg g− 1. Cyclic experiments show that the adsorption property of BCP-I is still in good condition. All in all, BCP-I with environment-friendliness, high selectivity and good reproducibility is a good choice for recovery of Er(III).

show abstract

Biochar-supported starch/chitosan-stabilized nano-iron sulfide composites for the removal of lead ions and nitrogen from aqueous solutions

Cited by 73 publications

References 50 publications

Efficient Adsorption of Nitrogen and Phosphorus in Wastewater by Biochar

Efficient Adsorption of Nitrogen and Phosphorus in Wastewater by Biochar

Remediation of nitrate contaminated groundwater using a simulated PRB system with an La–CTAC–modified biochar filler

Preparation and characterization of imprinted bacterial cellulose aerogel for efficient recovery of Er(III) from end-of-life erbium-doped fibers

Contact Info

Product

Resources

About