Removal of methyl violet 2B dye from aqueous solution using Nepenthes rafflesiana pitcher and leaves

Abstract

This study reported Nepenthes rafflesiana pitcher (NP) and Nepenthes rafflesiana leaves (NL) as new adsorbents for methyl violet (MV) dye. The experiments were done using 2 h contact time and without any pH alteration (pH 4.4). The effects of pH and ionic strength revealed hydrophobic-hydrophobic interaction as the predominant force of dye interaction with the adsorbent. Both NP-MV and NL-MV followed pseudo-second-order model indicating the adsorption processes may be governed by chemical process. Weber-Morris intraparticle diffusion model verified that the rate-limiting step of both the NP-MV and NL-MV systems is not intraparticle diffusion. The Langmuir model best described the adsorption process with high maximum monolayer adsorption (q m ) of 288.7 and 194.0 mg g -1 for NP-MV and NL-MV, respectively. Thermodynamics studies revealed both NP-MV and NL-MV systems are spontaneous and endothermic in nature. From the regeneration study, it was found that NP's and NL's adsorption capacities could be recovered using distilled water and base whereby distilled water was able to recover 78% (NP) and 71% (NL) while base was able to recover 82% for both samples after three regeneration cycles.

Biochar Derived from Palm Waste Supported Greenly Synthesized MnO2 Nanoparticles as a Novel Adsorbent for Wastewater Treatment

“…The different properties of the palm fronds and developed biochars were characterized by FT-IR, SEM-EDX, XRD, and BET analysis. The adsorption studies of the MnO 2 /PF biochar nanocomposite were investigated in a batch mode at pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11), an initial MO concentration of (10-50 mg/L), and an adsorbent dose of (0.01-0.1 g). It was found that the MnO 2 /PF biochar showed the highest micro-mesopores structure and surface area (70.97 m 2 /g), compared to those of other samples.…”

“…Different materials have been used to ensure the economic feasibility of the wastewater treatment process, such as agricultural waste, since it is abundantly available and renewable [10]. Water lettuce, agrowastes, Nepenthes rafflesiana pitcher, and leaves were also used as potential adsorbents for acid blue 25 (AB25) and methyl violet 2B (MV) dye removal, respectfully [11,12].…”

Effective and Simple NaOH-Modification Method to Remove Methyl Violet Dye via Ipomoea aquatica Roots

“…Furthermore, as observed in Figure 3, the Weber-Morris plot displayed multilinearity behavior. The first linear region indicates the intraparticle diffusion, while the second linear region indicates the slow equilibrium phase [30]. As the intercept of the first linear region of the Weber-Morris plot is not zero, this suggests that intraparticle diffusion is not the rate-controlling step.…”

“…MV has carcinogenic and mutagenic properties and is also a known irritant that can affect the eyes, skin, and gastrointestinal and respiratory tract [29]. MV also hinders the growth of microorganisms and prevents photosynthesis reactions from taking place in aquatic plants and animals in the environment [30].…”

Utilization of Unwanted Terrestrial Weeds for Removal of Dyes

“…Contact time is the time which ensures the duration of agitation time which is sufficient for the adsorption process to reach equilibrium. 26 The rate of adsorption increases with increase in time and becomes constant after attaining equilibrium. This is attributed to the availability of adsorption sites followed by slower adsorption by attaining saturation level after equilibrium.…”