Preparation of biochar-interpenetrated iron-alginate hydrogel as a pH-independent sorbent for removal of Cr(VI) and Pb(II)

Zhao, Chenhao; Hu, Lianxi; Zhang, Changai; Wang, Shengsen; Wang, Xiaozhi; Huo, Zhongyang

doi:10.1016/j.envpol.2021.117303

Cited by 69 publications

(11 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main benefits of biochar-based materials lie in their highly porous, large surface area, better ion exchange capacity, and plentiful functional groups. Attempts have been made to remove pollutants from aqueous solutions using different types of biochar material, including wheat straw biochar (Cui et al 2021), raw jujube seed biochar (Gayathri et al 2021), Douglas fir biochar (Herath et al 2021), pulp mill sludge biochar (Islam et al 2021a), pinewood biochar (Zhao et al 2021a), poplar sawdust biochar (Cheng et al 2021c), coconut shell biochar (Wu et al 2021c), and softwood biochar (Peter et al 2021). Research has attempted to elevate the removal capacity of biocharbased materials to remove pollutants via surface modification and impregnation through the use of various media, such as iron-based materials (Liu et al 2021b;Xu et al 2021a;Yu et al 2021c), oxide materials (Chen et al 2021a;Rahman et al 2021), organic functional groups (Liu et al 2022;Wu et al 2021a), and inorganic compounds (Herath et al 2021;Zhong et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

View full text Add to dashboard Cite

Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics. This review aims to highlight biochar production technologies, characteristics of biochar, and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water. Pyrolysis temperature, heat transfer rate, residence time, and type of feedstock are critical influential parameters. Biochar’s efficacy in managing contaminants relies on the pore size distribution, surface groups, and ion-exchange capacity. The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil. In general, biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area, hydrophobicity and microporosity. Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups, precipitation and electrostatic attraction. This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. Graphical Abstract

show abstract

Section: Introductionmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

View full text Add to dashboard Cite

show abstract

“…So far, some biochar composite hydrogels have been reported to strengthen comprehensive adsorption properties, such as alginate-kelp biochar composite hydrogel, 33 polyacrylamide hydrogel-biochar composite, 34 hydrogel-rice husk biochar composite, 35 biocharinterpenetrated iron-alginate hydrogel. 36 Though significant improvements have been made, the limited dye removal efficiency and slow adsorption rate of biochar composite hydrogel are still two severe challenges for practical application. Thus, preparing a new biochar composite hydrogel with excellent adsorption performance and remarkable recycling capacity is necessary.…”

Section: Biochemical Methodsmentioning

confidence: 99%

Hydrogel‐biochar composites for removal of methylene blue: Adsorption performance, characterization, and adsorption isotherm, kinetics, thermodynamics analysis

Wang¹,

Zheng²,

Zong³

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Low‐concentration organic dye wastewater severely threatens the growth and reproduction of animals and plants, as well as the survival and development of human beings and the environment. Although versatile hydrogel composites have been prepared owing to their excellent adsorption performance, the high‐removal efficiency and fast adsorption rate are still two crucial problems related to practical applications. Herein, xanthan gum‐g‐poly (acrylic acid‐co‐acrylamide)/biochar composite hydrogels with high‐removal efficiency and fast adsorption rate of methylene blue (MB) are synthesized using sodium dodecyl sulfate as a pore‐foaming agent. The composite hydrogels exhibit rough and porous three‐dimensional structures, which can make the internal active adsorption sites to be fully exposed and facilitate the MB diffusion process. MB's removal efficiency can reach 96.64% within 30 minutes, which is almost the first time that a biochar‐contained hydrogel could show superior removal efficiency of more than 95% in such a short adsorption time. The factors affecting the adsorption performance are studied comprehensively. Langmuir and pseudo‐second‐order models fit the adsorption process well. Moreover, the MB removal rate still exceeds 80% after eight cycles, which is also a vital indicator for practical treatment. Adsorption mechanism analysis shows that the synergistic effect among biochar, xanthan gum, and polymer chains and the porous structure improve the adsorption performance of the composite hydrogels. The proposed hydrogel‐biochar composites with high‐removal efficiency and adsorption rate are highly promising as an alternative adsorbent for advanced printing and dyeing wastewater treatment.

show abstract

“…More importantly, these hydrogels lack the necessary conditions to mimic the extracellular matrix microenvironment [ 47 , 48 ]. Therefore, there is an urgent need to develop naturally derived hydrogel materials for cartilage tissue engineering [ [49] , [50] , [51] ].…”

Section: Introductionmentioning

confidence: 99%