Zeid A Alothman

King Saud University | KKUH · Department of Chemistry

Herein, a sustainable and renewable biomass waste namely olive (Olea europaea) stone powder (OSP) was introduced to be a cost-effective biosorbent for removing the methyl violet 2B (MV 2B) dye from aqueous contaminated water. The main features of OSP were analyzed utilizing several methods such as XRD, FSEM-EDX, FTIR, and pHpzc. The optimization of...

Herein, chitosan (CS) and watermelon seed shell (WSS) were blended to yield a new biocomposite (CS/WSS) via sonication with an ultrasonic bath of 40 kHz for 25 min at 20 W. Thus, CS/WSS adsorbent was applied for the removal of reactive orange 16 dye (RO16) from the aqueous environment. The CS/WSS characteristics were evaluated using XRD, SEM–EDX, F...

Herein, a new biocomposite was obtained by loading a bacterial suspension of Escherichia coli onto a chitosan matrix to produce a unique biocomposite (chitosan – E. coli) with effective properties for biosorption of malachite green dye from water. The physicochemical characteristics of the chitosan – E. coli biocomposite were studied by employing X...

A very simple and cost-effective silica-based hybrid stationary phase was synthesized for the separation of five synthetic peptides, five proteins, and benzene derivatives. Silica monolith was synthesized via sol–gel process. Particles obtained through the grinding of silica monolith were suspended in methanol and sedimented under gravity to obtain...

Herein, chicken bone (CB) and rice waste (RW) food were converted to activated carbon (CBRWAC) via microwave assisted H3PO4 activation. The applicability of CBRWAC as an efficient adsorbent was evaluated for its removal efficacy of a cationic dye, namely methyl violet (MV), from an aqueous environment. The physicochemical properties of CBRWAC were...

Herein, a composite adsorbent of chitosan/algae/coal fly ash (CS/Alg/FA) was synthesized to be an effective and renewable adsorbent for the removal of cationic dye (methyl violet 2B dye: MV2B) from synthetic wastewater. The physicochemical characteristics of CS/Alg/FA were assessed utilizing various analytical techniques, such as XRD, BET, FTIR, pH...

Herein, spent coffee (SPC) was converted to activated carbon (SPCAC) via microwave-assisted H3PO4 activation. The microwave power was set at 600 W and irradiation time 15 min with an impregnation ratio of precursor/chemical activator (1-g SPC:2-mL H3PO4). The surface property and functionality of SPCAC was investigated by several analytical techniq...

In this work, sunflower (Helianthus annuus) seed pericarp (SSPC) was converted into mesoporous activated carbon (SSPCAC) via microwave-assisted ZnCl2 activation to be a cost-effective and renewable adsorbent for crystal violet (CV) dye removal. The obtained SSPCAC exhibits a preferable surface area of 641 m²/g with mesoporous characteristics. A sta...

In this work, a zwitterion adsorbent which consists of crosslinked chitosan-benzil/algae/coal fly ash (CS-BZ/Alg/FA) was developed for the removal of two structurally different anionic dye (remazol brilliant blue R (RBBR)) and a cationic dye (thionine (THN)). The physicochemical characteristics of CS-BZ/Alg/FA were investigated by several analytica...

A biopolymer matrix of chitosan (CTS) and algae (AGA) was chemically modified with a natural genipin (GEN) cross-linker agent via hydrothermal process. The resulting green adsorbent (CTS-GEN/AGA) was evaluated for removal of the cationic dye (methyl violet, MV) from aqueous media. The optimization of MV adsorption onto CTS-GEN/AGA was performed usi...

Herein, a novel biomaterial of crosslinked chitosan-glutaraldehyde combined with Bacillus subtilis biomass (CHS-GLU/BCL) was synthesized via hydrothermal synthesis to effectively remove the anionic dye (Acid red 88; AR88) from synthetic wastewater solution. The physicochemical properties of the CHS-GLU/BCL biomaterial were characterized using XRD,...

This study involved the development of grafted chitosan-benzaldehyde/algae/coal fly ash (CS-BD/Alg/FA) to be a promising adsorbent for cationic dye namely brilliant green (BG) dye. The adsorption of brilliant green (BG) dye was optimized using Box–Behnken design (BBD) resulting in the determination of the optimal adsorption variables. A dosage of 0...

In this work, a sulphonated date palm (Phoenix dactylifera) stone (SDPS) was produced as a cost-effective and renewable adsorbent for the removal of a cationic dye called methylene blue (MB). The production process involved the use of microwave irradiation combined with H2SO4 activation under the condition of 600 W microwave radiation for 15 min. T...

A blended tropical pineapple (Ananas comosus) peel and crown (PPC) fruit wastes were utilized as an alternate source material for producing mesoporous-activated carbon through H3PO4 activation employing microwave pyrolysis. Diverse techniques including BET, XRD, FTIR, and SEM–EDX were employed to characterize the PPC-AC. The efficacy of PPC-AC as a...

Hydrotalcite materials (HTs) were synthesized by a facile and swift combined mechanochemistry/coprecipitation approach, and their catalytic activity was evaluated and compared with conventionally synthesized hydrotalcites (co-precipitation method) in the Knoevenagel condensation between furfural and ethyl cyanoacetate/malononitrile. Characterizatio...

In this study, sunflower seed pericarp activated carbon (SFSPC-AC) was produced from sunflower seed pericarp (SFSPC) using microwave-assisted chemical activation with H3PO4. The SFSPC-AC was characterized using XRD, BET, FTIR, FE-SEM, and EDX techniques. Its effectiveness in removing methylene blue (MB) dye from an aqueous solution was evaluated. T...

In this study, a mixture of pineapple peel (Ananas comosus) and algal biomass was subjected to a thermochemical treatment to develop a sustainable adsorbent based on thermochemical-treated mixture of pineapple peel and algae (TCTPPALG) for removal of a harmful model cationic azo dye (methylene blue (MB)) pollutant. The production process involved m...

In this study, a composite adsorbent of chitosan/algae/coal fly ash (CS/Alg/FA) was synthesized to be an effective and renewable adsorbent for cationic methyl violet 2B dye (MV2B) removal from synthetic wastewater. The optimization of key adsorption variables (A: CS/Alg/FA dosage (0.02-0.1 g/100 mL), B: solution pH (4-10); C: contact time (20-180 m...

In this work, a magnetic cross-linked chitosan-benzil/organoclay/Fe3O4 biocomposite (CHI-BZI/OC/Fe3O4) was synthesized as a bio-adsorbent for the removal of remazol brilliant blue R (RBBR) dye from aquatic environment. The adsorption factors i.e., CHI-BZI/OC/Fe3O4 dosage, pH, and time were statistically optimized using the Box-Behnken design (BBD)....

This study employed palm date stone (PDS) as an alternative precursor to produce activated carbon (PDSAC) via microwave-assisted ZnCl2 activation. The Box-Behnken design (BBD) method was utilized to optimize the critical adsorption factors for removal of crystal violet dye (CV) dye by PDSAC. The optimized adsorption parameters were obtained; A: PDS...

Hybrid material-derived adsorbents have shown a great applicable efficiency in various fields, including industrial uses and environmental remediation. Herein, zinc oxide nanoparticle modified with carbon (ZnO-C) was fabricated and utilized for wastewater treatment through the adsorption of Zn(II), Cd(II), Co(II), and Mn(II). The surface and struct...

The most perilous environmental hazards arise from the contamination of water by heavy metal ions, owing to the non-biodegradability of these metals, as well as their rapid dissemination throughout components of the environment via the food chain. Nano-based adsorbents have been used for the adsorption removal of many heavy metal cations, but separ...

Herein, blended mandarin (Citrus reticulata) peel (MP) and algae (AG) biomass were thermochemically treated (TCTMPAG) to yield a cost-effective and renewable adsorbent for removal of methylene blue (MB), a known toxic cationic dye. The preparation included microwave irradiation, in conjunction with H3PO4 activation at 800 W for 15 min in a nitrogen...

Herein, a mixed fruit wastes of watermelon (Citrullus lanatus) rind (WR) and orange (Citrus sinensis) peel (OP) were utilized as an alternative precursor for producing a mesoporous activated carbon (WROPAC) with a relatively high specific surface area of 831.4 m 2 /g. A fast and convenient activation method of microwave assisted H 3 PO 4 was applie...

In this study, a hydrothermal approach was employed to graft chitosan (Chit)/algae (ALG) with salicylaldehyde (SA), resulting in the synthesis of a biocomposite named salicylaldehyde-based chitosan Schiff base/algae (Chit-SA/ALG). The main objective of this biocomposite was to effectively remove methyl violet (MV), an organic dye, from aqueous solu...

A fast LC-MS method has been developed for the identification of berberine in plant extracts. The retention times for the standard berberine and berberine extracted from Berberis vulgaris , Berberis aquifolium , and Hydrastis canadensis were 1.80, 1.82, 1.79 and 1.79, respectively, using mobile phase of a mixture of ammonium acetate buffer and acet...

The facile synthesis of cross-linked chitosan-glutaraldehyde/nano silica (CHS-GLA/n-Silica) nanocomposite was accomplished in two steps including the functionalization of a natural biopolymer (CHS) with an inorganic nanomaterial (n-Silica), followed by a cross-linking process with glutaraldehyde (GLA). The ability of CHS-GLA/n-Silica to remove acid...

Due to a great demand for amylose and cellulose polymeric chromatographic chiral columns, the enantiomeric separation of thiourea derivatives of naringenin was achieved on the different amylose (Chiralpak‐IB) and cellulose chiral (Chiralcel‐OJ and Chiralcel‐OD‐3R) columns with varied chromatographic conditions. The isocratic mobile phases used were...

In this study, a cross-linked chitosan-epichlorohydrin/nanosilica (CS-EPH/NSi) bionanocomposite was prepared using a simple two-step process. First, functionalization of chitosan with nanosilica followed by crosslinking process with epichlorohydrin. The CS-EPH/NSi bionanocomposite’s adsorption property toward the removal of reactive orange 16 (RO16...

Cadmium telluride (CdTe) solar cells have attracted a lot of interest in recent years, attributed to their low cost and eco-friendly fabrication technique. However, the back contact is still the key issue for further improvement in device performance due to the work function difference between p-CdTe and metal contacts. In this study, the interatom...

Mercury [Hg(II)] contamination is an indefatigable global hazard that causes severe permanent damage to human health. Extensive research has been carried out to produce mercury adsorbents; however, they still face certain challenges, limiting their upscaling. Herein, we report the synthesis of a novel amine-impregnated inverse vulcanized copolymer...

Mechanochemistry emerged as an effective tool for the synthesis of nanomaterials, with potentially scalable prospects. This contribution aims to provide an overview of the most recent potential of mechanochemical routes in designing advanced nanomaterials including zeolites, metal oxides, and mixed metal oxides because of their catalytic applicatio...

A very simple mesotrione-sensing medium with enhanced sensitivity detection limits has been proposed. A renovated hydrothermal method was adopted for synthesizing fluorescent carbon dots from ethylenediamine and glucose using a Teflon-lined simple autoclave in a GC oven. The resultant carbon dots were characterized via TEM, FTIR, UV–vis, particle s...

Females of some mosquito species are anthropophilic, as they feed on human blood to support egg production and, hence, are forensically valuable if found at a crime scene. The present study investigated the blood meal digestion process in Culex pipiens L. both with and without heroin and proposed a method for estimating the post-feeding interval (P...

A cross-linked chitosan-glutaraldehyde/algae (CHS-GTD/AL) composite was synthesized through a two-step process. Firstly, the natural biopolymer chitosan (CHS) was functionalized with algae (AL), introducing additional functional groups to the pristine chitosan. Then, a cross-linking process was carried out using glutaraldehyde (GTD). The resulting...

Herein, a natural material including chitosan (CTS) and algae (food-grade algae, FGA) was exploited to attain a bio-adsorbent (CTS/FGA) for enhanced methyl violet 2B dye removal. A study of the FGA loading into CTS matrix showed that the best mixing ratio between CTS and FGA to be used for the MV 2B removal was 50 %:50 % (CTS/FGA; 50:50 w/w). The p...

Hybrid materials derived adsorbents have showed a great applicable efficiency in various fields including industrial uses and environmental remediation. Herein, the zinc oxide nanoparticles anchored carbon (ZnO-C) is fabricated and utilized for wastewater treatment by adsorption of Zn(II), Cd(II), Co(II) and Mn(II). The surface and structural chara...

Ti3C2-MXene material, known for its strong electronic conductivity and optical properties, has emerged as a promising alternative to noble metals as a cocatalyst for the development of efficient photocatalysts used in environmental cleanup. In this study, we investigated the photodegradation of crystal-violet (CV) dye when exposed to UV light using...

The current study employed the hydrothermal approach to graft chitosan functionalized-SiO2 nanoparticles with an aromatic aldehyde (salicylaldehyde, SA) to obtain an organic–inorganic nanohybrid composite of salicylaldehyde-based chitosan Schiff base/SiO2 (CTS-SA/SiO2) for uptake of an acidic azo dye (acid red 88, AR88) from aqueous media. The effe...

Because of the potential bioactivities, nanoparticles have engendered hope in scientific communities for developing novel therapeutic strategies. In the present study, it was tested whether selenium nanoparticles (Se-NPs) can protect the liver in mothers with gestational diabetes (DM). The gestational rats were divided into three groups (n = 8). Gr...

In this study, chitosan/nano SiO2 (CTS/NS) was chemically modified with bisphenol A diglycidyl ether (BADGE) cross-linker-assisted hydrothermal process to create an effective adsorbent, CTS-BADGE/NS, for the removal of reactive orange 16 (RO16) dye from aquatic systems. Box-Behnken design (BBD) was used to optimize the adsorption process by varying...

Heliotropium bacciferum plant is very important and has been used for medicinal values since ancient times. The present study deals with the extraction of essential oil (0.14 w/w) of this plant and its GC-MS analysis, anti-inflammatory, and anti-bacterial activities evaluation. GC analysis of essential oil confirmed 76 compounds with 49 terpenes an...

In this study, the focus was on utilizing tropical plant biomass waste, specifically bamboo (BB), as a sustainable precursor for the production of activated carbon (BBAC) via pyrolysis-induced K 2 CO 3 activation. The potential application of BBAC as an effective adsorbent for the removal of methylene blue (MB) dye from aqueous solutions was invest...

This study involved the conversion of lignocellulosic bamboo waste (BMW) into mesoporous activated carbon (BMWAC) via microwave-assisted ZnCl2 activation, where the BMWAC was evaluated for its removal of methylene blue (MB) dye from aqueous media. Various characterization techniques, including pHpzc, SEM–EDX, XRD, BET, and FTIR spectral analysis we...

In this study, microwave induced ZnCl2 activation was utilized to produce high surface area activated carbon (AC) from a readily available and sustainable precursor, namely food waste in the form of leftover noodles (LN). The resulting activated carbon composite is referred to as LNAC/ZnO. By using food waste as the starting material, this research...

Cobalt (Co) is a transition metal and is classified as a beneficial metal for plants, but its benefits for plants remain obscure. Cobalt has been reported to negatively affect plant physiochemical processes both at higher (toxic) and lower (deficient) applied levels. High concentrations of cobalt in plant organs cause irreversible changes to the pl...

Herein, Fe3O4 core-TiO2/mesoSiO2 and Fe3O4 core-mesoSiO2/TiO2 double shell nanoparticles were prepared by first (R1) and second (R2) routes and applied for the removal of methylene blue. The reported adsorption capacities for R1-0.2, R1-0.4 and R2 samples were 128, 118 and 133 mg.g-1, respectively, which were obtained after 80 min as equilibrium co...

The extraction of berberine was carried out from Berberis vulgaris, Berberis aquifolium, and Hydrastis canadensis plants using ethanol and water (70:30, v/v). The extracted berberine was characterized by ultraviolet-visible and Fourier-transform infrared spectroscopy. The purity of berberine was ascertained by thin-layer chromatography using n-prop...