Salah satu permasalahan lingkungan yang ditimbulkan dari adanya lindi di TPA Piyungan yaitu pencemaran pada badan air, sungai dan air tanah. Untuk mengatasi permasalahan ini salah satunya dengan sistem Constructed Wetlands dengan menggunakan tumbuhah eceng gondok. Tujuan dari penelitian ini adalah untuk mengetahui tingkat penurunan konsentrasi Timbal (Pb) yang terdapat dalam limbah cair TPA Piyungan dengan Constructed Wetlands menggunakan tumbuhan eceng gondok dan untuk mengetahui seberapa besar kapasitas serapan tumbuhan eceng gondok terhadap kandungan Timbal (Pb) dalam limbah cair TPA Piyungan. Dalam penelitian ini digunakan reaktor yang terbuat dari kayu yang dilapisi plastik dengan ukuran 0,5 m x 1,0 m. Setiap reaktor diberi media tanah 5 cm, dan diberi tumbuhan sebanyak 14 buah. Reaktor tersebut diberi perlakuan dengan konsentrasi limbah yang bervariasi (100%, 75%, 50%, 25%, dan 0%), dan waktu pengambilan sampel (0, 3, 6, 9, 12 hari). Dengan menggunakan metode SSA (Spektrofotometri Serapan Atom) Berdasarkan pengujian diperoleh bahwa penurunan logam Pb pada limbah cair TPA Piyungan hari ke-12, yaitu sebesar 0.0501mg/L pada konsentrasi 100%, 0.0295mg/L pada konsentrasi 75%, 0.0267mg/L pada konsentrasi 50% dan 0.0041 mg/L pada konsentrasi 25%.
Terbium ion‐4'carboxybenzo‐18crown‐6‐ether complex (TbCCE) photoprobe is a sensitive and stable luminescent photoprobe used to detect low (9.4 x10−9 mol L−1) concentrations of nalbuphine (NAL) in serum and pharmaceutical formulations. Here we discuss molecular modeling of the interacting species using DFT and TD‐DFT. The results reveal strong binding energy of TbCCE (−153.36 kJ/mol) and explain the results of Stern‐Volmer bimolecular quenching analysis due to the presence of NAL in the proximity (at 2.403 Å apart from Tb ion) of the emissive TbCCE. Ab Initio molecular dynamic (AIMD) simulations are used to explain the dynamical changes of TbCCE molecular kinetic energy in its S1 state induced by collision with NAL. The AIMD simulates collisions between interacting molecules, which are reflected in the observed quenching of the photoprobe. Kinetic energy changes during molecular motions in the S1 state of TbCCE in presence of NAL indicate energy transfer process leading to quenching starting at 57 fs at NAL‐TbCCE distance is ~ 1.6 Å. The excited state AIMD simulations carried out in this work suggest a new avenue for future research on luminescence quenching.
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