top of page

Environmental sustainability

Address environmental challenges, conserve ecosystem and secure the future resources.

Purification of water from Cu using agriculture waste

Water & wastewater treatment process technology

Metal contamination in water is a widespread ecological problem that can lead to various health hazards. Copper is one of the common contaminants in water whose concentrations continue to elevate due to high industrial activities. To date, adsorption can be considered an efficient method for removing metals, with one direction of development being the synthesis of green adsorbents. This work demonstrated the utilization of cellulose from waste to synthesize adsorbent for copper. Rice husk is utilized as the cellulose source for preparing hydrogel, and then incorporation of zeolite was done to enhance the surface area and porosity. Adsorbent preparation was performed by first dissolving rice husk cellulose in NaOH/urea to form cellulose gel. Then, zeolite was incorporated at a mass ratio of cellulose-to-zeolite of 4:2. Finally, a crosslinking agent was added to obtain the hydrogel composite. The presence of exfoliated clay particles in the hydrogel matrix was revealed through scanning electron micrograph imaging. The additional functional groups due to the addition of zeolite particles in the hydrogel were analyzed using the Fourier transform infrared spectroscopy technique. The resulting hydrogel composites were applied for the removal of Cu2+ from water. The effect of pH level, contact time, and coexisting metal ions  on adsorption effectiveness was investigated. X-ray photoelectron spectroscopy analysis was performed to get insight into the adsorption mechanism. Adsorption kinetics reveals that adding zeolite allows more rapid adsorption of Cu2+; based on the pseudo-first-order parameter. However, incorporating zeolite contrarily affected the adsorption capacity, where it was decreased from 17.05 to 10.77 mg g􀀀 1 for the adsorption process at 30 ◦C. This work presents a novel approach to upcycling agrowaste, offering a sustainable solution for mitigating metal contamination in water.


Check out the article at Industrial Crops and Products 210 (2024) 118179

Metal-phenolic network coated-adsorbent 

Water & wastewater treatment process technology

Surface modification of durian rind cellulose (DCell) was done by utilizing the strong coordination effect of polyphenol-based metal phenolic networks (MPNs). MPNs from Fe(III)-tannic acid (FTN) and Fe(III)-gallic acid (FGN) were coated on DCell via a self-assembly reaction at pH 8, resulting in adsorbent composites of FTN@DCell and FGN@DCell for removal of Cr(VI). Batch adsorption experiments revealed that FTN coating resulted in an adsorbent composite with higher adsorption capacity than FGN coating, owing to the greater number of additional adsorption sites from phenolic hydroxyl groups of tannic acid. FTN@DCell exhibits an equilibrium adsorption capacity at 30°C of 110.9 mg/g for Cr(VI), significantly higher than FGN@DCell (73.63 mg/g); the adsorption capacity was increased at higher temperature (i.e., 155.8 and 116.8 mg/g at 50°C for FTN@DCell and FGN@DCell, respectively). Effects of pH, adsorbent dose, initial concentration, and coexisting ions on Cr(VI) removal were investigated. The kinetics fractal-based model Brouers-Sotolongo indicates the 1st and 2nd order reaction for Cr(VI) adsorption on FTN@DCell and FGN@DCell, respectively. The isotherm data can be described with a fractal-based model, which implies the heterogeneous nature of the adsorbent surface sites. The Cr(VI) adsorption via surface complexation with phenolic hydroxyl groups was confirmed by evaluating the functional groups shifting. FGN@DCell and FTN@DCell were found to have good reusability, maintaining over 50 % of their adsorption efficiency after four adsorption-desorption cycles. Environmental assessment with Arabidopsis thaliana demonstrated their potential in eliminating the Cr(VI) phytotoxic effect. Thus, this study has shown the efficient and economical conversion of durian waste into environmentally benign adsorbent for heavy metal treatment.


Check out the article at Journal of Hazardous Materials 464 (2024) 132973

Other related publications ...

Studies on the performance of bentonite and its composite as phosphate adsorbent and phosphate supplementation for plant

Journal of Hazardous Materials 399 (2020) 123130

Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

Scientific Reports 10 (2020) 19212

Ecological-safe and low-cost activated-bleaching earth: Preparation, characteristics, bleaching performance, and scale-up production

Journal of Cleaner Production 279 (2021) 123793

Biocomposite hydrogel beads from glutaraldehyde-crosslinked phytochemicals in alginate for effective removal of methylene blue

Journal of Molecular Liquids 329 (2021) 115579

One‑step synthesis of nitrogen‑grafted copper‑gallic acid for enhanced methylene blue removal

Scientific Reports 11 (2021) 12021

TiO2/guar gum hydrogel composite for adsorption and photodegradation of
methylene blue

International Journal of Biological Macromolecules 193 (2021) 721–733

Synthesis and Characterization of Methionine-Functionalized Boehmite with Enhanced Removal of Methyl Orange

Biointerface Research in Applied Chemistry 12 (2022) 5845 - 5859

Removal of hexavalent chromium using durian in the form of rind, cellulose, and activated carbon: Comparison on adsorption performance and economic evaluation

Journal of Cleaner Production 380 (2022) 135010

Studies on the performance of functionalized Fe3O4 as phosphate
adsorbent and assessment to its environmental compatibility

Journal of the Taiwan Institute of Chemical Engineers 131 (2022) 104162

Investigation of the influence of crosslinking activation methods on the
physicochemical and Cu(II) adsorption characteristics of cellulose hydrogels

Journal of Environmental Chemical Engineering 10 (2022) 106971

Low-cost structured alginate-immobilized bentonite beads designed for an
effective removal of persistent antibiotics from aqueous solution

Environmental Research 207 (2022) 112162

Polystyrene-templated hollow mesoporous magnetite as a bifunctional
adsorbent for the removal of rhodamine B via simultaneous adsorption
and degradation

Journal of Environmental Chemical Engineering 10 (2022) 108194

Removal of pararosaniline hydrochloride (basic red 9) from aqueous system
with lignocellulose fraction of sugarcane bagasse as adsorbent

Industrial Crops & Products 188 (2022) 115573

Removal of heavy metals from water by macro-mesoporous calcium
alginate–exfoliated clay composite sponges

Chemical Engineering Journal 452 (2023) 139261

Preparation of MIL100/MIL101-alginate composite beads for selective
phosphate removal from aqueous solution

International Journal of Biological Macromolecules 231 (2023) 123322

Extractives-free sugarcane bagasse as adsorbent for the removal of Rhodamine B (Basic Violet 10) with high capacity and reusability

Journal of Industrial and Engineering Chemistry 124 (2023) 175-200

Modification of cellulosic adsorbent via iron-based metal phenolic networks coating for efficient removal of chromium ion

Journal of Hazardous Materials 464 (2024) 132973

Synthesis of cellulose hydrogel by utilizing agricultural waste and zeolite
for adsorption of copper metal ions

Industrial Crops & Products 210 (2024) 118179

bottom of page