Enhanced adsorption capacity of cellulose hydrogel based on corn stalk for pollutants removal and mechanism exploration

A Review of Natural Polysaccharides-Based Flocculants Derived from Waste: Application Efficiency, Function Mechanism, and Development Prospects

“…The nonedible plant tissue and edible residues in crops contain abundant polysaccharide components. Agricultural waste such as pomelo peels, corn straw, mushrooms, citrus peels, water chestnut peels, sugar cane bagasse, pumpkin, lychee residue, aloe vera leaves, eggplant peels, lemon peels, rattan pepper seeds, fennel, roses, and lavender has been reported to contain carbohydrates such as pectin and polysaccharides. ,− The molecular structure and surface morphology of some WPs are shown in Figures and , respectively. Rhamnuronic acid disaccharide structural unit →2)-α- l -Rhap-(1 → 4)-α- d -GalpA-(1 → and neutral sugar side chains (arabinose and galactose) are found widely in cell walls of fruits and vegetables .…”

“…Pectin and lignin can be retained in sugar cane waste for more than one year. As a nontoxic and easily degradable water-soluble polysaccharide, pectin is considered as an effective material for improving adsorption performance and can be cross-linked with cellulose to form a composite hydrogel with excellent adsorption properties for Methylene Blue, Pb 2+ , and tetracycline . Pectin generates bridging flocculation by enhancing the liquid viscosity to strengthen the adsorption of oil-in-water lipids.…”

“…Pectin generates bridging flocculation by enhancing the liquid viscosity to strengthen the adsorption of oil-in-water lipids. Mao et al obtained pectin from okra and proved that the flocculation performance was linear with rhamnose (10–20 mg/L) and galactose (300–800 mg/L) in pectin . Additionally, the −COO – and −OH groups in the molecular structure of pectin can be used as effective binding sites for kaolin adsorption. , The combination of Al 3+ and pectin can produce significant flocculation activity; the pectin dosage does not exceed 20 mg/L, showing the best turbidity removal effect (99%), cation concentration greater than 0.5 mM, and a decrease in flocculation activity after exceeding 20 mg/L …”

“…As a nontoxic and easily degradable watersoluble polysaccharide, pectin is considered as an effective material for improving adsorption performance and can be cross-linked with cellulose to form a composite hydrogel with excellent adsorption properties for Methylene Blue, Pb 2+ , and tetracycline. 73 Pectin generates bridging flocculation by enhancing the liquid viscosity to strengthen the adsorption of oil-in-water lipids. Mao et al obtained pectin from okra and proved that the flocculation performance was linear with rhamnose (10−20 mg/L) and galactose (300−800 mg/L) in pectin.…”

Adsorption properties of Pb(II) and Cd(II) in acid mine drainage by oyster shell loaded lignite composite in different morphologies

“…Among these methods, the adsorption method is an effective method for the removal of heavy metal ions because of its advantages, which are easy operation, mild adsorption conditions, good adaptability and high efficiency. However, it has become a trend to find efficient, low-cost and readily available adsorbents (activated sludge 21 , 22 , industrial waste 23 , 24 , shell powder 22 , 25 , zeolite 26 , steel slag 27 , agricultural and forestry waste 28 ) to replace the traditional expensive adsorbents. Among many low-cost adsorbents, lignite stands out because it is a natural mineral with low calorific value upon combustion.…”