Adsorption of Rare Earth Elements (REEs) onto Activated Carbon Modified with Potassium Permanganate (KMnO4)

Abstract

The adsorption capacity of activated carbon modified with potassium permanganate (KMnO4) for rare earth elements (REEs) from aqueous solution was investigated. The modified activated carbon was characterized by SEM (scanning electron microscopy), FT-IR (Fourier transform infrared spectrometer), and N2 adsorption-desorption tests. Adsorption experiments from aqueous solutions containing known amounts of some REEs (i.e. La, Lu, Yb, Eu, Y, Sc) onto the carbon were explored in a batch system. The amount of REEs adsorbed at different pH values, initial concentrations, and contact times were determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES) in order to determine the optimum conditions for REEs adsorption. The adsorption of REEs on the activated carbon was well fitted by the Langmuir isothermal adsorption equation. The rates of adsorption were found to conform to pseudo-second order kinetic. These results present the modified activated carbon as an efficient adsorbent for REEs, hence creating new avenues for the treatment of industrial waste waters including pollutants. It is very significant information from the viewpoint of environmental protection.

Recovery of Rare Earth Elements from Low-Grade Feedstock Leachates Using Engineered Bacteria

“…Additionally, given the difference in adsorption capacity between control E. coli and C. crescentus cells (13.1 compared to 23.5 mg Tb/g dcw, respectively), strategic selection of the adsorbent organism is one potential means to improve REE adsorption capacity. Nevertheless, the 28 mg/g DCW capacity of LBT-displayed E. coli and C. crescentus cells is comparable to other reported adsorbents, including salmon milt (50.1 mg/g), activated carbon (∼0.1–145 mg/g , ), ligand grafted silica (167 mg/g) and cation exchange resin (∼20–120 mg/g).…”

Constructing Two‐Dimensional (2D) Heterostructure Channels with Engineered Biomembrane and Graphene for Precise Scandium Sieving

“…F) Summary of X/Sc selectivity for various materials, X = La, Ce, Lu. [34][35][36][37][38][39][40][41][42][43][44] G) The variation of XRD characteristic peaks patterns for LP-GO-b and GO membranes immersed into the different solutions, including deionized water, La 3+ , Ce 3+ , Sc 3+ , Y 3+ , Yb 3+ , Lu 3+ . H) The cycles stability to separate using LP-GO-b heterostructure membrane.…”

“…Excessive ultrasonic time (40 min) (Figure S8F, Supporting Information) impatrs SF X1/Sc of LP-GO-a as shown in Figure S5E (Supporting Information). Prolonged ultrasonic treatment may affect the structural integrity of the biomembranes, consequently influencing the separation performance of the heterostructure Resin containing glycol amic acid group 1.5 ≈18.20 (x = Ce) [36] SG-MTPB 3.0 ≈24.60 (x = La) [37] Silica material (SBA-15) 3.0 ≈9.00 (x = La) [38] MIL-101 4.5 ≈2.31 (x = La) [39] KMnO4AC 3.0 ≈1.71 (x = La) [40] Silica-PAN 5.0 ≈94.00 (x = La) [41] PAN Activated carbon-APTES nanosilica 4.0 ≈1.09 (x = La) [42] Acac modified silica gel 6.0 ≈1.02 (x = La) [43] APTES silica-chitosan-PAN 4.0 ≈7.20 (x = La) [44] LanM protein (column-immobilized LanM) membrane. [34] Finally, the 25-min ultrasound duration will be chosen for subsequent experiments based on the detection results.…”

“…The selectivity surpassed that of previously reported membranes tested under similar measurement conditions (Figure 2F, Table 1; Figure S13, Supporting Information). [34][35][36][37][38][39][40][41][42][43][44] Subsequently, attempts were made to enhance permeability by adjusting the pH environment of the driven fluid. The results revealed that the permeation capacity of REE 3+ is slightly higher at a pH of the driven solution ≈2.5 (Figure 2D) compared to that at pH ≈4.0 (Figure S10E, Supporting Information), which can be attributed to the larger osmotic pressure gradient.…”

Uji cemaran Escherichia coli pada punggung (back) dan paha atas (thigh) daging ayam broiler

“…Tabung reaksi yang menunjukkan warna biru ungu kemudian bening dinyatakan sebagai sampel yang positif mengandung formalin, sedangkan sampel daging sehat sebagai kontrol, menunjukkan warna kuning dengan indikasi tidak mengandung formalin. Kalium permanganat (KMnO4) yang diteteskan dalam tabung reaksi merupakan agen pengoksidasi kuat yang menghasilkan warna merah muda, biru atau ungu yang intens pada sampel air normal [38] [39]. Sampel daging ayam broiler yang sudah dicampur dengan formalin oleh pedagang dengan tujuan mengawetkan daging ayam, akan mengakibatkan hilangnya warna larutan KMnO4 dan kemudian menjadi warna bening atau warna yang pudar.…”